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Senior Backend Engineer
Senior Backend Engineer
Plexus Resource Solutions Ltd
United States
From £190,000 to £240,000 per annum
$190k - $240k - Fully Remote - San Francisco, USA - RAISED OVER $100 MILLION!!! Plexus has another great opportunity in the Web3 space. The company is creating entertainment that empowers on the blockchain. Powered by talent from around the globe, they believe in making bold moves to create products that have never been seen in the marketplace. They are looking for a Senior Backend Engineer to join their DEX team to design, built and scale the services that power decentralized trading. * Architect and Build DEX services with a focus on throughput, determinism, and fault isolation. * Design APIs (REST/WebSocket) and data models that are explicit , versioned, and easy to integrate. * Integrate on-chain logic with their blockchain. * Performance and Reliability. * Security and Compliance by Design. * Observability: Define golden signals, metrics, tracing and error budget
$190k - $240k - Fully Remote - San Francisco, USA - RAISED OVER $100 MILLION!!! Plexus has another great opportunity in the Web3 space. The company is creating entertainment that empowers on the blockchain. Powered by talent from around the globe, they believe in making bold moves to create products that have never been seen in the marketplace. They are looking for a Senior Backend Engineer to join their DEX team to design, built and scale the services that power decentralized trading. * Architect and Build DEX services with a focus on throughput, determinism, and fault isolation. * Design APIs (REST/WebSocket) and data models that are explicit , versioned, and easy to integrate. * Integrate on-chain logic with their blockchain. * Performance and Reliability. * Security and Compliance by Design. * Observability: Define golden signals, metrics, tracing and error budget
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Search Relevance Engineer - REMOTE US/UK/EU - Eastern time preferred - About the role - We are looking for an experienced Search Relevance Engineer to help shape and optimise the search experience for millions of users. This role sits at the intersection of engineering and data science, focusing on search relevancy, ranking models, and query understanding. You will work closely with Product, Engineering, DevOps, and Data teams to design and deliver strategic projects that directly impact customer experience. What youll be doing * Fine-tuning keyword search (including BM25), query expansion, and retrieval methods (ANN dense retrieval, sparse retrieval, semantic search). * Applying techniques such as entity/name density recognition, query understanding, query rescorers, and learning-to-rank models. * Experimenting with embeddings and vector search to improve personalisa
Search Relevance Engineer - REMOTE US/UK/EU - Eastern time preferred - About the role - We are looking for an experienced Search Relevance Engineer to help shape and optimise the search experience for millions of users. This role sits at the intersection of engineering and data science, focusing on search relevancy, ranking models, and query understanding. You will work closely with Product, Engineering, DevOps, and Data teams to design and deliver strategic projects that directly impact customer experience. What youll be doing * Fine-tuning keyword search (including BM25), query expansion, and retrieval methods (ANN dense retrieval, sparse retrieval, semantic search). * Applying techniques such as entity/name density recognition, query understanding, query rescorers, and learning-to-rank models. * Experimenting with embeddings and vector search to improve personalisa
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As a Full Stack Software Engineer, you'll work closely with law enforcement customers to design, build, and maintain secure applications and services. * Design, develop, and maintain secure full-stack applications using modern frameworks and cloud-native technologies. They deliver secure, mission-critical software solutions that help protect the UK and its interests. With a strong focus on innovation, collaboration, and agility, they empower engineers to solve complex challenges in high-trust environments. * Collaborate with cross-functional teams and end-users to understand mission needs and translate them into scalable software solutions. This is a unique opportunity to contribute to national security through cutting-edge software engineering. ££700
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Senior/Lead Full Stack Developer (React / Python) AI Start up!
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EC1, City of London
Negotiable
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Senior/Lead Hands on Full Stack Developer - React / Python Looking for a Full Stack developer who loves working across the stack - React on the front end, Python on the back end. * Strong React & Python skills £110,000+ Equity | Full-Time | Start-up * Build responsive UIs in React * Develop APIs & services in Python (either Django/Flask/FastAPI) * Help shape our tech stack London | Hybrid (3days in the office and 2 days from home) We're a high-growth start-up building a leading healthcare! * Own features end-to-end * API & database experience * A proa
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Robert Half
SW1, South West London
pension, healthcare, bonus,
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Backend Software Engineers at Palantir build software at scale to transform how organisations use data. Our Software Engineers are involved throughout the product lifecycle, from idea generation, design, prototyping, and production delivery. Our Product Development organisation is made up of small teams of Software Engineers. Foundry Software Engineers may be offered the opportunity to Frontline, an exclusive program unlike any other. Palantir builds the worlds leading software for data-driven decisions and operations. Engineers work autonomously and make decisions independently, within a community that will support and challenge you as you grow and develop, becoming a strong technical contributor and
Backend Software Engineers at Palantir build software at scale to transform how organisations use data. Our Software Engineers are involved throughout the product lifecycle, from idea generation, design, prototyping, and production delivery. Our Product Development organisation is made up of small teams of Software Engineers. Foundry Software Engineers may be offered the opportunity to Frontline, an exclusive program unlike any other. Palantir builds the worlds leading software for data-driven decisions and operations. Engineers work autonomously and make decisions independently, within a community that will support and challenge you as you grow and develop, becoming a strong technical contributor and
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Plexus is working with a powerhouse in the DeFi space and are on the hunt to find a capable Smart Contract Developer, who will deploy advanced smart contracts powering some of the biggest projects in Web3, with direct impact on governance and DeFi innovation. Position: Smart Contract Developer * Design & Deliver: Translate client needs into secure, production-ready smart contracts and lead projects from design to deployment and maintenance. * Solidity & DeFi Expertise: Build advanced smart contract architectures, with strong knowledge of DeFi protocols, security best practices, and Ethereum standards. * 3+ years Solidity development with live smart contracts in production. * Security focus: awareness of vulnerabilities, audits, or big TVL contract exp
Plexus is working with a powerhouse in the DeFi space and are on the hunt to find a capable Smart Contract Developer, who will deploy advanced smart contracts powering some of the biggest projects in Web3, with direct impact on governance and DeFi innovation. Position: Smart Contract Developer * Design & Deliver: Translate client needs into secure, production-ready smart contracts and lead projects from design to deployment and maintenance. * Solidity & DeFi Expertise: Build advanced smart contract architectures, with strong knowledge of DeFi protocols, security best practices, and Ethereum standards. * 3+ years Solidity development with live smart contracts in production. * Security focus: awareness of vulnerabilities, audits, or big TVL contract exp
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Senior Python Developer Azure - Scaling AI Platform. £90K. REMOTE
Senior Python Developer Azure - Scaling AI Platform. £90K. REMOTE
Recruitment Revolution
EC2A, City of London
Up to £90,000 Benefits
As demand surges for our product, we are currently hiring for a Senior Python Developer with Azure experience and a footing with AI whos ready to move at our speed. AI / Azure / Python Developer Your Skills: Experience with Azures native AI stack (including AI Foundry, Search, Cosmos DB, and AKS), strong Python and C# skills, VS Code (ideally with AI tools like Copilot), familiarity with Docker, Kubernetes, and scalable cloud-native architecture, and a track record of working in agile teams using Azure DevOps for CI/CD and automated testing. Code primarily in Python and C# - with bonus points if you can jump into React.js when needed - Strong programming skills in Python and C#, with a focus on writing clean, maintainable, and well-structured code - Were building some
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Backend Engineer Python
Backend Engineer Python
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EC1, City of London
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Backend Engineer To support our growth and deliver a world-class experience, were looking for a Backend Engineer to join our core product team. * Solid experience with Python, GraphQL, and MongoDB - On-Chain Social Network - Remote £90k £120k - Plexus are working with an on-chain social network that empowers people to express themselves, connect with others, and explore the value of imagination. Responsibilities * Work closely with the team to design, build, and deliver new product features * Develop and maintain the APIs that power our platform * Contribute to system reliability by taking part in our on-call rotation - Requirements * Flexibility to move across the stack when needed * Hands-on experience in blockchain development * Strong product intuition with a focus on user experie
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[Bonus] Experience working in early-stage startups or as a founding engineer Salary up to £150k + Equity - London or Fully Remote - Can sponsor for UK based candidates - Join an exciting Startup, who are on a mission to humanise technology by developing real-time, AI personas who feel as natural as interacting with a human. The vision is to build the next computer interface, one that mimics how we have communicated for millennia by developing AI personas who feel as natural as interacting with a human. The company is a few months away from announcing their Series A and is looking to expand the team to fit with current demand and growth. What will you do? You'll architect and build the systems that power our AI humans, working across the entire stack. This includes designing real-time communication systems, optimizing our AI pipeline, and ensuring our
[Bonus] Experience working in early-stage startups or as a founding engineer Salary up to £150k + Equity - London or Fully Remote - Can sponsor for UK based candidates - Join an exciting Startup, who are on a mission to humanise technology by developing real-time, AI personas who feel as natural as interacting with a human. The vision is to build the next computer interface, one that mimics how we have communicated for millennia by developing AI personas who feel as natural as interacting with a human. The company is a few months away from announcing their Series A and is looking to expand the team to fit with current demand and growth. What will you do? You'll architect and build the systems that power our AI humans, working across the entire stack. This includes designing real-time communication systems, optimizing our AI pipeline, and ensuring our
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I am currently working with a London-based financial services consultancy who are actively seeking multiple Senior Python Developers to join one of their prestigious end clients in the Investment Banking space. * Extensive Python Development experience in Financial Services/Investment Banking - Mandatory. * Strong experience with relational databases. * Extensive AWS experience. * Good experience with data modelling. * Strong experience with Spark. * Up to £800pd in-scope via Umbrella. * Initial 6-month contract with extensions. * London-based hybrid working. If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruit
I am currently working with a London-based financial services consultancy who are actively seeking multiple Senior Python Developers to join one of their prestigious end clients in the Investment Banking space. * Extensive Python Development experience in Financial Services/Investment Banking - Mandatory. * Strong experience with relational databases. * Extensive AWS experience. * Good experience with data modelling. * Strong experience with Spark. * Up to £800pd in-scope via Umbrella. * Initial 6-month contract with extensions. * London-based hybrid working. If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruit
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They are seeking a Software Engineer to work with them on a contract. * Scrum/agile methodology (Product owner and/or Scrum master), or ability to deliver software on short cycles - City of London - Hybrid (3/2 split) Contract £900 - £1000 per day (Via Umbrella) cer Financial are working alongside an international bank, who are based in the City of London. * Hands-on Full Stack development using React as front end and Java 21 as the primary language for back end * Work with other teams including Front office risk teams, trading desk, Quants, and DevOps to build state of the art front to back pricing and risk solutions, * Focus on non-functional requirements from the start increasing maintainability and reliability. * Continuous improvement of the development and release environment, tooling, and processes. * Work closely with the oper
They are seeking a Software Engineer to work with them on a contract. * Scrum/agile methodology (Product owner and/or Scrum master), or ability to deliver software on short cycles - City of London - Hybrid (3/2 split) Contract £900 - £1000 per day (Via Umbrella) cer Financial are working alongside an international bank, who are based in the City of London. * Hands-on Full Stack development using React as front end and Java 21 as the primary language for back end * Work with other teams including Front office risk teams, trading desk, Quants, and DevOps to build state of the art front to back pricing and risk solutions, * Focus on non-functional requirements from the start increasing maintainability and reliability. * Continuous improvement of the development and release environment, tooling, and processes. * Work closely with the oper
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Senior Software Engineer
Senior Software Engineer
Halian Technology Limited
W1, Central London
From £90,000 to £95,000 per annum Plus bonus and benefits
With a focus on technology, agility, and product excellence, we offer an exciting environment where engineers are empowered to make real impact. * Collaborate with frontend engineers to build seamless APIs and interfaces * 5+ years of professional software development experience * Good understanding of software engineering principles, REST APIs, and asynchronous programming - Join a leading payments company at the forefront of innovation in the financial services sector. They're on a mission to simplify payments and create seamless, secure transaction experiences for millions of users. Role Overview - They're looking for a skilled and passionateBackend skillsinNode.js. You will be part of a high-performing engineering team building robust and scalable backend services, with opportunities to contribute
With a focus on technology, agility, and product excellence, we offer an exciting environment where engineers are empowered to make real impact. * Collaborate with frontend engineers to build seamless APIs and interfaces * 5+ years of professional software development experience * Good understanding of software engineering principles, REST APIs, and asynchronous programming - Join a leading payments company at the forefront of innovation in the financial services sector. They're on a mission to simplify payments and create seamless, secure transaction experiences for millions of users. Role Overview - They're looking for a skilled and passionateBackend skillsinNode.js. You will be part of a high-performing engineering team building robust and scalable backend services, with opportunities to contribute
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I am currently recruiting for a Software Engineer to work for a fascinating company within the space domain that are pushing the boundaries of technology based in London. To support the business with its future plans as well as enabling them to be able to deliver upon their current project demands they have the need to appoint another Software Engineer on a permanent basis. In this role as a Software Engineer, you will be responsible for coding in Rust and C/C++. * At least 2 years' commercial experience as a Software Engineer or similar unless you have completed a PhD - Initially this will be on the ground software to integrate with mission control software, but this will diversify in time to be more focused on the flight dynamics element. * Experience developing
Backend Software Engineers at Palantir build software at scale to transform how organizations use data. As a Software Engineer on infrastructure, you'll contribute high-quality code to underpin Palantir Foundry and Gotham with performant, secure, and scalable building blocks, enabling products deployed to the most important institutions in the public and private sector. Our Software Engineers are involved throughout the product lifecycle, from idea generation, design, prototyping, and production delivery. Our Product Development organization is made up of small teams of Software Engineers. Our infrastructure teams are responsible for the lowest layers of our software stack, often focu
Backend Software Engineers at Palantir build software at scale to transform how organizations use data. As a Software Engineer on infrastructure, you'll contribute high-quality code to underpin Palantir Foundry and Gotham with performant, secure, and scalable building blocks, enabling products deployed to the most important institutions in the public and private sector. Our Software Engineers are involved throughout the product lifecycle, from idea generation, design, prototyping, and production delivery. Our Product Development organization is made up of small teams of Software Engineers. Our infrastructure teams are responsible for the lowest layers of our software stack, often focu
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We're looking for a Senior Fullstack Engineer who thrives on solving complex problems, mentoring others, and building scalable, high-quality digital products. This is a hands-on leadership role where you'll work across both front-end and back-end stacks to deliver impactful features and drive technical excellence. * Lead the design and development of technical solutions across the stack * Mentor and support other engineers Are you ready to lead fullstack innovation in a high-growth tech environment? * Build and maintain features for new and existing digital products * Identify opportunities for technical innovation and process improvement * Collaborate across teams to share knowledge and drive delivery * Back-End: C# (.NET Core, ASP.NET MVC 4.0+) * Front-End: React, Next.js, TypeScrip
We're looking for a Senior Fullstack Engineer who thrives on solving complex problems, mentoring others, and building scalable, high-quality digital products. This is a hands-on leadership role where you'll work across both front-end and back-end stacks to deliver impactful features and drive technical excellence. * Lead the design and development of technical solutions across the stack * Mentor and support other engineers Are you ready to lead fullstack innovation in a high-growth tech environment? * Build and maintain features for new and existing digital products * Identify opportunities for technical innovation and process improvement * Collaborate across teams to share knowledge and drive delivery * Back-End: C# (.NET Core, ASP.NET MVC 4.0+) * Front-End: React, Next.js, TypeScrip
An innovative, mission-driven LegalTech SaaS start-up is looking for a Senior Product Engineer (Backend & Data) with deep experience in Python, Product development, and Data engineering. Founding Engineer | Python | GCP | Terraform | Event-Based Systems | Data Pipelines - They want engineers to be setup to stay on top in the new AI world. Your mission: own, build, and scale version 1 - the first commercial-ready Product to go to market. * Salary: Up to £100,000 (DOE) + Equity * Location: Fully remote (UK only) * Stack:Python, TypeScript, GCP, Pub/Sub, SQL & NoSQL, IaC (Terraform), CI/CD (GitHub Actions), Observability tools, AI tooling - Youll join a remote first, high-trust engineering team working with a modern, cloud-native stack - with real influence over technical decisions from day one. Youll ta
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Own our AI models end-to-end: dataset strategy, training/fine-tuning, evaluation, optimization, and deployment to real hardware in the field. * Hands-on experience with Audio/Video AI - HuggingFace Transformers, SpeechBrain or torchaudio, one detection/pose stack (YOLO, MediaPipe). You'll turn messy real-world streams into robust, low-latency inference pipelines. What you'll do * Design, train, and fine-tune text/audio/vision models (e.g., DistilRoBERTa, wav2vec2, YOLO) for threat and aggression detection. * Build reproducible training pipelines (HF/ PyTorch/ SpeechBrain), incl. PEFT/LoRA, adapters, and transfer learning. * Optimize for real-time: quantization, pruning, ONNX/TensorRT, mixed precision, batching, caching. * Ship models to edge & cloud with CI/CD, versioning, and rollback; instrument latency and accuracy SLAs. * Create d
Own our AI models end-to-end: dataset strategy, training/fine-tuning, evaluation, optimization, and deployment to real hardware in the field. * Hands-on experience with Audio/Video AI - HuggingFace Transformers, SpeechBrain or torchaudio, one detection/pose stack (YOLO, MediaPipe). You'll turn messy real-world streams into robust, low-latency inference pipelines. What you'll do * Design, train, and fine-tune text/audio/vision models (e.g., DistilRoBERTa, wav2vec2, YOLO) for threat and aggression detection. * Build reproducible training pipelines (HF/ PyTorch/ SpeechBrain), incl. PEFT/LoRA, adapters, and transfer learning. * Optimize for real-time: quantization, pruning, ONNX/TensorRT, mixed precision, batching, caching. * Ship models to edge & cloud with CI/CD, versioning, and rollback; instrument latency and accuracy SLAs. * Create d
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Full Stack Engineer TypeScript Elixir AWS
Full Stack Engineer TypeScript Elixir AWS
Client Server
EC2A, City of London
£85000 - £100000 per annum
Apply now to find out more about this Full Stack Engineer / Developer (TypeScript Full Stack Elixir) opportunity. Full Stack Engineer / Developer (TypeScript Elixir AWS) London / WFH to £100k - You could be progressing your career in a senior, hands-on Full Stack Engineer role at a successful and profitable energy trading market data scale-up. As a Full Stack Engineer you will take ownership, working on technically challenging Greenfield development projects. You'll be working on complex problems with scalability and reliability in mind, across the full development lifecycle from architecture and design through to implementation. There's a range of technology in the stack, you'll have a 50/50 split between backend and frontend develop
Apply now to find out more about this Full Stack Engineer / Developer (TypeScript Full Stack Elixir) opportunity. Full Stack Engineer / Developer (TypeScript Elixir AWS) London / WFH to £100k - You could be progressing your career in a senior, hands-on Full Stack Engineer role at a successful and profitable energy trading market data scale-up. As a Full Stack Engineer you will take ownership, working on technically challenging Greenfield development projects. You'll be working on complex problems with scalability and reliability in mind, across the full development lifecycle from architecture and design through to implementation. There's a range of technology in the stack, you'll have a 50/50 split between backend and frontend develop
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Palantir Engineer / Developer - Perm & outside IR35 Contract roles - DV Cleared - London
Palantir Engineer / Developer - Perm & outside IR35 Contract roles - DV Cleared - London
FryerMiles Recruitment
London
£500 - 750 per day
FryerMiles are delighted to be partnering with a renowned consultant to assist with their recruitment of multiple Palantir Engineers / Developers to join their team in London. * Active DV Clearance, UKEO * Palantir Foundry / Gotham experience * Strong engineering background * Strong coder with demonstrated proficiency in programming languages such as Python, TypeScript/JavaScript, or similar.
FryerMiles are delighted to be partnering with a renowned consultant to assist with their recruitment of multiple Palantir Engineers / Developers to join their team in London. * Active DV Clearance, UKEO * Palantir Foundry / Gotham experience * Strong engineering background * Strong coder with demonstrated proficiency in programming languages such as Python, TypeScript/JavaScript, or similar.
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We have positions available for enthusiastic and experienced system software developers for the development of cloud related functionality in our Linux-based cluster software environment. * Work with the latest hardware (e.g. GPUs, accelerators, high-speed interconnects such as InfiniBand, Spectrum X) and software technologies such as parallel file-systems (e.g. Lustre, GPFS, BeeGFS, WekaIO), OpenStack, Docker, Kubernetes, Jupyter and Ceph. * 8+ years of industry experience in software development, on Linux platforms, preferably with a focus on infrastructure. * Fluent in C++ and/or Python and intimately familiar with object oriented software design, design patterns, and concurrent programming techniques. * Expertise in system-level programming, proven ability to develop robust tools and automation, at scale. * Proficiency in automated testing of code, using CI/CD sys
We have positions available for enthusiastic and experienced system software developers for the development of cloud related functionality in our Linux-based cluster software environment. * Work with the latest hardware (e.g. GPUs, accelerators, high-speed interconnects such as InfiniBand, Spectrum X) and software technologies such as parallel file-systems (e.g. Lustre, GPFS, BeeGFS, WekaIO), OpenStack, Docker, Kubernetes, Jupyter and Ceph. * 8+ years of industry experience in software development, on Linux platforms, preferably with a focus on infrastructure. * Fluent in C++ and/or Python and intimately familiar with object oriented software design, design patterns, and concurrent programming techniques. * Expertise in system-level programming, proven ability to develop robust tools and automation, at scale. * Proficiency in automated testing of code, using CI/CD sys
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Senior Software Developer - £65,000 to £85,000 - Hybrid - London
Senior Software Developer - £65,000 to £85,000 - Hybrid - London
FryerMiles Recruitment
London
£65k - 85k per year
FryerMiles are delighted to be working with a global AI business to assist with their recruitment of a Senior Software Developer to join their team in London. This is a fantastic opportunity for Senior Software Developer to join a rapidly growing global business working with large private and government clients. If you’re a Senior Software Developer with good problem solving and creativity skills, please apply today and one of our Consultant’s will be in contact to discuss the role in more detail. * Taking project briefs from the product owner and translating this into clean, well documented and elegant code * Ensure quality in service provision in line with ISO 9001 * Ensure information security in line with ISO27001 and Cyber Essentials Plus * Development and maintenance of AI system focused on intelligence analysis
FryerMiles are delighted to be working with a global AI business to assist with their recruitment of a Senior Software Developer to join their team in London. This is a fantastic opportunity for Senior Software Developer to join a rapidly growing global business working with large private and government clients. If you’re a Senior Software Developer with good problem solving and creativity skills, please apply today and one of our Consultant’s will be in contact to discuss the role in more detail. * Taking project briefs from the product owner and translating this into clean, well documented and elegant code * Ensure quality in service provision in line with ISO 9001 * Ensure information security in line with ISO27001 and Cyber Essentials Plus * Development and maintenance of AI system focused on intelligence analysis