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33 Permanent API jobs in Welwyn Garden City + 20 miles
Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
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Cybersecurity Engineer - Hybrid Remote
Cybersecurity Engineer - Hybrid Remote
VERTECH GROUP (UK) LTD
N7, North London
From £65,000 to £75,000 per annum + Benefits
Strong knowledge of web/mobile security (OWASP Top 10, API security), cloud security (AWS), and CI/CD pipeline hardening
Strong knowledge of web/mobile security (OWASP Top 10, API security), cloud security (AWS), and CI/CD pipeline hardening
FEATURED
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Senior/Lead Full Stack Developer (React / Python) AI Start up!
Senior/Lead Full Stack Developer (React / Python) AI Start up!
Robert Half
EC1, City of London
Negotiable
API & database experience
API & database experience
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Manage API integrations between platforms. * Strong capability with API integrations and low/no-code tools (n8n, Zapier, Airtable, Make).
Manage API integrations between platforms. * Strong capability with API integrations and low/no-code tools (n8n, Zapier, Airtable, Make).
FEATURED
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ASP.NET Web API
ASP.NET Web API
NEW
Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
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Python, Flask ,Azure, MySQL, API, Django, FastAPI
Python, Flask ,Azure, MySQL, API, Django, FastAPI
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Forward Deployed Engineer
Forward Deployed Engineer
McGregor Boyall Associates Limited
EC1, City of London
£70000 - £90000 per annum
Strong data modelling, pipeline development, and API design experience.
Strong data modelling, pipeline development, and API design experience.
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Strong foundation in web development, REST API design, and secure best practices
Strong foundation in web development, REST API design, and secure best practices
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Implement and maintain API integrations
Implement and maintain API integrations
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Role: Full Stack Software Engineer (UK-based, early-stage startup) £60,000 - £80,000 per annum | No Sponsorship | x3 week in office - Backed by technology start up accelerator and VC - Join a mission-driven AI startup transforming how medical and healthcare organisations collaborate. Using machine learning and advanced recommendation systems, the team helps to matchmake some of the leading Medical and Pharmaceuticalbusinesses with their extensive network of professionals. This allows them to engage seamlessly all while reducing operational costs so resources can focus on changing lives. This is the chance to work on cutting-edge AI technology at an early stage with real influence on product and architecture to help medical organisations do more with their resources while changing lives and impact clients across the US and FTSE markets.
Role: Full Stack Software Engineer (UK-based, early-stage startup) £60,000 - £80,000 per annum | No Sponsorship | x3 week in office - Backed by technology start up accelerator and VC - Join a mission-driven AI startup transforming how medical and healthcare organisations collaborate. Using machine learning and advanced recommendation systems, the team helps to matchmake some of the leading Medical and Pharmaceuticalbusinesses with their extensive network of professionals. This allows them to engage seamlessly all while reducing operational costs so resources can focus on changing lives. This is the chance to work on cutting-edge AI technology at an early stage with real influence on product and architecture to help medical organisations do more with their resources while changing lives and impact clients across the US and FTSE markets.
NEWFEATURED
JavaScript Developer - Hybrid Remote
JavaScript Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
N7, North London
From £80,000 to £100,000 per annum + Benefits
JavaScript Developer - Location: 3-4 days per wk from home / 1-2 days in London - Salary: Circa 80k 100k + Benefits - JavaScript Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4 years backend development experience * Solid expertise in Node.js * Experience integrating LLM APIs and open-source models into production systems * Hands-on work implementing Retrieval-Augmented Generation (RAG) pipelines * Experience designing and optimizing agentic AI workflows - Tremendous opportunity offering plenty of scope for career progression in a friendly, inno
JavaScript Developer - Location: 3-4 days per wk from home / 1-2 days in London - Salary: Circa 80k 100k + Benefits - JavaScript Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4 years backend development experience * Solid expertise in Node.js * Experience integrating LLM APIs and open-source models into production systems * Hands-on work implementing Retrieval-Augmented Generation (RAG) pipelines * Experience designing and optimizing agentic AI workflows - Tremendous opportunity offering plenty of scope for career progression in a friendly, inno
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Senior Software Developer
Senior Software Developer
Lean People Services Limited
Luton, Bedfordshire
From £75,000 to £85,000 per annum
up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
Backend Engineer - Scale Systems with Real Impact ?? Tired of tinkering at the edges? Want to actually shape the backbone of a platform that's transforming how the world's biggest enterprises run their tech? This is one of those rare roles where you get in early, build the foundations, and watch your work scale across global businesses. We're working with a high-growth London startup on a mission to reinvent enterprise software. Their AI-driven platform is already saving household-name customers millions in IT costs, shaving months off ERP project timelines, and making sense of the mess that legacy systems leave behind. SAP is just the beginning - they're building a whole new category of Enterprise System Intelligence. The Role * Build core systems capable of handling tens of millions of lines of code and large-scale LLM workloads.
Backend Engineer - Scale Systems with Real Impact ?? Tired of tinkering at the edges? Want to actually shape the backbone of a platform that's transforming how the world's biggest enterprises run their tech? This is one of those rare roles where you get in early, build the foundations, and watch your work scale across global businesses. We're working with a high-growth London startup on a mission to reinvent enterprise software. Their AI-driven platform is already saving household-name customers millions in IT costs, shaving months off ERP project timelines, and making sense of the mess that legacy systems leave behind. SAP is just the beginning - they're building a whole new category of Enterprise System Intelligence. The Role * Build core systems capable of handling tens of millions of lines of code and large-scale LLM workloads.
NEWFEATURED
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Backend Engineer Python
Backend Engineer Python
Plexus Resource Solutions Ltd
EC1, City of London
From £90,000 to £120,000 per annum
Backend Engineer - 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. To support our growth and deliver a world-class experience, were looking for a Backend Engineer to join our core product team. 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 * Solid experience with Python, GraphQL, and MongoDB * Flexibility to move across the stack when needed * Hands-on experience in blockchain development * Strong product intuition with a focus on user experience - Benefits * Competitive salary * Top-quality medical, dental & vision insurance
Backend Engineer - 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. To support our growth and deliver a world-class experience, were looking for a Backend Engineer to join our core product team. 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 * Solid experience with Python, GraphQL, and MongoDB * Flexibility to move across the stack when needed * Hands-on experience in blockchain development * Strong product intuition with a focus on user experience - Benefits * Competitive salary * Top-quality medical, dental & vision insurance
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Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
NEWPREMIUM
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Software Engineer Java AWS React - Start-up
Software Engineer Java AWS React - Start-up
Client Server
EC2A, City of London
£90000 - £110000 per annum + equity + benefits
Software Engineer / Developer (Java AWS React) London / WFH to £110k - Are you a technologist looking for an opportunity to be part of something big from the start? You could be progressing your career in an impactful role at a newly established Fintech start-up, set up by a small team of finance and technology entrepreneurs with a hugely successful track record. As a Software Engineer you will join a small team to build systems from the ground up, working across the full technology stack with a focus on designing, developing and deploying cloud-native microservices that form the core of the platform. You'll collaborate closely with the Lead Engineer, Architect and Product Manager to shape system design, APIs and data models to enable scalable backend logic and clean UI. You can work from home most of the time, meeting up with colleagues in London; as the company grow
Software Engineer / Developer (Java AWS React) London / WFH to £110k - Are you a technologist looking for an opportunity to be part of something big from the start? You could be progressing your career in an impactful role at a newly established Fintech start-up, set up by a small team of finance and technology entrepreneurs with a hugely successful track record. As a Software Engineer you will join a small team to build systems from the ground up, working across the full technology stack with a focus on designing, developing and deploying cloud-native microservices that form the core of the platform. You'll collaborate closely with the Lead Engineer, Architect and Product Manager to shape system design, APIs and data models to enable scalable backend logic and clean UI. You can work from home most of the time, meeting up with colleagues in London; as the company grow
NEWPREMIUM
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ABAP Developer - Break out of the SAP Box
ABAP Developer - Break out of the SAP Box
LJ Recruitment Limited
EC1, City of London
£50000 - £75000 per annum
ABAP Developer ? AI / Startup Role?? Most ABAP roles keep you maintaining the same old codebase. This one lets you take your SAP expertise and plug it straight into a modern AI platform that's transforming how global enterprises run their tech. This London startup is tackling a multi-billion-dollar problem: helping the world's biggest companies turn ERP chaos into clarity. Their AI engine saves millions in IT costs, accelerates project timelines by months, and modernises decades-old systems in ways that have never been done before. This is a role for those who live and breathe tech. Hours run 9am-7pm, and the expectation is clear: hard work and full commitment are what make the difference here. What you'll do * Write and optimise ABAP while shaping how AI agents interpret SAP. * Go beyond SAP, contribute to backend services, APIs, and infrastructure.
ABAP Developer ? AI / Startup Role?? Most ABAP roles keep you maintaining the same old codebase. This one lets you take your SAP expertise and plug it straight into a modern AI platform that's transforming how global enterprises run their tech. This London startup is tackling a multi-billion-dollar problem: helping the world's biggest companies turn ERP chaos into clarity. Their AI engine saves millions in IT costs, accelerates project timelines by months, and modernises decades-old systems in ways that have never been done before. This is a role for those who live and breathe tech. Hours run 9am-7pm, and the expectation is clear: hard work and full commitment are what make the difference here. What you'll do * Write and optimise ABAP while shaping how AI agents interpret SAP. * Go beyond SAP, contribute to backend services, APIs, and infrastructure.
NEWFEATURED
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Join us an AI Software Engineer at Peregrine Resourcing. At Peregrine, we find the best talent for our clients. As a permanent employee of Peregrine, with access to all our standard benefits, you will be deployed across our portfolio of clients as a specialist consultant, working on a wide array of complex projects across multiple industries. Software Engineer with AI skills focused on building intelligent systems, enhancing enterprise solutions, and driving innovation. * Design and implement AI-powered features for enterprise software, such as intelligent search, predictive analytics, and automation tools. * Build custom machine learning models tailored to client-specific use cases * Collaborate with product teams to identify opportunities for AI integration that improve user experience and operational efficiency.
Join us an AI Software Engineer at Peregrine Resourcing. At Peregrine, we find the best talent for our clients. As a permanent employee of Peregrine, with access to all our standard benefits, you will be deployed across our portfolio of clients as a specialist consultant, working on a wide array of complex projects across multiple industries. Software Engineer with AI skills focused on building intelligent systems, enhancing enterprise solutions, and driving innovation. * Design and implement AI-powered features for enterprise software, such as intelligent search, predictive analytics, and automation tools. * Build custom machine learning models tailored to client-specific use cases * Collaborate with product teams to identify opportunities for AI integration that improve user experience and operational efficiency.
NEWPREMIUM
Join us an AI Software Engineer at Peregrine Resourcing. At Peregrine, we find the best talent for our clients. As a permanent employee of Peregrine, with access to all our standard benefits, you will be deployed across our portfolio of clients as a specialist consultant, working on a wide array of complex projects across multiple industries. Software Engineer with AI skills focused on building intelligent systems, enhancing enterprise solutions, and driving innovation. * Design and implement AI-powered features for enterprise software, such as intelligent search, predictive analytics, and automation tools. * Build custom machine learning models tailored to client-specific use cases * Collaborate with product teams to identify opportunities for AI integration that improve user experience and operational efficiency.
Join us an AI Software Engineer at Peregrine Resourcing. At Peregrine, we find the best talent for our clients. As a permanent employee of Peregrine, with access to all our standard benefits, you will be deployed across our portfolio of clients as a specialist consultant, working on a wide array of complex projects across multiple industries. Software Engineer with AI skills focused on building intelligent systems, enhancing enterprise solutions, and driving innovation. * Design and implement AI-powered features for enterprise software, such as intelligent search, predictive analytics, and automation tools. * Build custom machine learning models tailored to client-specific use cases * Collaborate with product teams to identify opportunities for AI integration that improve user experience and operational efficiency.
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Job Role: Senior Full-Stack PHP Developer - Working Hours: 5 days per week - Job Type: Permanent - Salary: £70,000 - £85,000 depending on experience - Location: London - Remote: 4 days remote - 1 day on-site in London office - Postcode NW6 - About the Company - Our client is a rapidly growing platform that connects individuals with industry professionals for special events. By offering unique opportunities, the platform allows professionals in the field to achieve higher earnings while enjoying enhanced flexibility and a better work-life balance. Role Overview - This is an exciting opportunity to join a high-growth, early-stage startup. As a Full-Stack Developer, youll work closely with the founders and engineers in a tight-knit, London-based team. Youll have a direct impact on the companys expansion into new international markets, shaping the future of the business.
Job Role: Senior Full-Stack PHP Developer - Working Hours: 5 days per week - Job Type: Permanent - Salary: £70,000 - £85,000 depending on experience - Location: London - Remote: 4 days remote - 1 day on-site in London office - Postcode NW6 - About the Company - Our client is a rapidly growing platform that connects individuals with industry professionals for special events. By offering unique opportunities, the platform allows professionals in the field to achieve higher earnings while enjoying enhanced flexibility and a better work-life balance. Role Overview - This is an exciting opportunity to join a high-growth, early-stage startup. As a Full-Stack Developer, youll work closely with the founders and engineers in a tight-knit, London-based team. Youll have a direct impact on the companys expansion into new international markets, shaping the future of the business.
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We are delighted to be partnering with a successful technology consultancy that is expanding its Software Development team. This is an excellent opportunity for a proactive and committed Software Developer with expertise in .NET (C# / ASP.NET), modern JavaScript frameworks, and SQL to contribute to impactful projects across a diverse client base. About the role - As a Software Developer, you will be working on the development, and maintenance of their internal software product, ensuring seamless integrations into their clients systems. You'll also get involved with external projects, collaborating closely with clients to understand their needs, and design effective solutions. This role blends hands-on technical work with client interaction, giving you the chance to make a visible impact. Key Responsibilities
We are delighted to be partnering with a successful technology consultancy that is expanding its Software Development team. This is an excellent opportunity for a proactive and committed Software Developer with expertise in .NET (C# / ASP.NET), modern JavaScript frameworks, and SQL to contribute to impactful projects across a diverse client base. About the role - As a Software Developer, you will be working on the development, and maintenance of their internal software product, ensuring seamless integrations into their clients systems. You'll also get involved with external projects, collaborating closely with clients to understand their needs, and design effective solutions. This role blends hands-on technical work with client interaction, giving you the chance to make a visible impact. Key Responsibilities
FEATURED
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Data Management and Business Intelligence Lead - Remote working
Data Management and Business Intelligence Lead - Remote working
Apsley Recruitment Ltd
Bovingdon, CM7
Up to £60,000 per annum bonus and strong package
Strong experience of within the fields of Data Management, Application Estates and Business Intelligence platforms required for a role that will develop into a Senior Management Position. The focus will be on driving clarity, alignment, and performance across these domains. You will need to work closely with our outsourced delivery partners and internal stakeholders to ensure initiatives are well-defined, prioritised, and executed to high standards. While hands-on delivery is not the primary expectation, your ability to understand technical landscapes and translate business needs into actionable direction will be critical to success. Required Skills:- * Strong understanding of data management principles, including governance, quality, security, and life cycle. * Solid grasp of enterprise applications and how they support operational and strategic business functions.
Strong experience of within the fields of Data Management, Application Estates and Business Intelligence platforms required for a role that will develop into a Senior Management Position. The focus will be on driving clarity, alignment, and performance across these domains. You will need to work closely with our outsourced delivery partners and internal stakeholders to ensure initiatives are well-defined, prioritised, and executed to high standards. While hands-on delivery is not the primary expectation, your ability to understand technical landscapes and translate business needs into actionable direction will be critical to success. Required Skills:- * Strong understanding of data management principles, including governance, quality, security, and life cycle. * Solid grasp of enterprise applications and how they support operational and strategic business functions.
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Senior Full Stack Engineer
Senior Full Stack Engineer
REVYBE IT RECRUITMENT LIMITED
EC1, City of London
From £100,000 to £120,000 per annum + Shares
London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
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Data Engineer (Defence)
Data Engineer (Defence)
Anson Mccade
SG1, Stevenage
GBP 45,000.00 - 55,000.00 per year;GBP 45,000.00 per year;GBP 55,000.0
£45,000 - 55,000 GBP - Onsite WORKING - Location: Stevenage, Cambridge, East of England - United Kingdom Type: Permanent - Data Engineer - Generative AI | Defence Technology - A leading international defence organisation is seeking an experienced Data Engineer with a focus on Generative AI to join their IM GenAI Delivery Office in the UK. You will play a pivotal role in designing, managing, and optimising datasets that support advanced defence systems and critical internal projects. * Develop and maintain robust, secure, and high-integrity datasets for internal defence applications. * Design and optimise data pipelines to ensure reliable, compliant, and scalable solutions. * Apply your expertise in Generative AI, NLP, and OCR to enhance and automate data processes. * Build ETL workflows, APIs, and other data integration solutions tailored for mission-critical environm
£45,000 - 55,000 GBP - Onsite WORKING - Location: Stevenage, Cambridge, East of England - United Kingdom Type: Permanent - Data Engineer - Generative AI | Defence Technology - A leading international defence organisation is seeking an experienced Data Engineer with a focus on Generative AI to join their IM GenAI Delivery Office in the UK. You will play a pivotal role in designing, managing, and optimising datasets that support advanced defence systems and critical internal projects. * Develop and maintain robust, secure, and high-integrity datasets for internal defence applications. * Design and optimise data pipelines to ensure reliable, compliant, and scalable solutions. * Apply your expertise in Generative AI, NLP, and OCR to enhance and automate data processes. * Build ETL workflows, APIs, and other data integration solutions tailored for mission-critical environm
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