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82 API jobs in Middlegreen + 20 miles
273 exact matches jobs are outside your preferred location
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Join a fast-growing AI startup transforming a trillion-pound industry through intelligent automation. We're building the next generation of workflow technology - streamlining complex, manual processes and empowering professionals to focus on the work that truly matters. If you love solving deep technical problems, shaping architecture, and seeing your code have a real-world impact, this is a chance to build something meaningful from the ground up. The Role - We're looking for a Senior Backend Engineer to take ownership of key backend services that power our AI-driven platform. You'll work closely with product, frontend, and AI teams to design, build, and scale backend systems that handle large-scale data, complex workflows, and real-time interactions. You'll join a small, high-calibre team where your ideas genuinely shape the direction of the product and the company.
Join a fast-growing AI startup transforming a trillion-pound industry through intelligent automation. We're building the next generation of workflow technology - streamlining complex, manual processes and empowering professionals to focus on the work that truly matters. If you love solving deep technical problems, shaping architecture, and seeing your code have a real-world impact, this is a chance to build something meaningful from the ground up. The Role - We're looking for a Senior Backend Engineer to take ownership of key backend services that power our AI-driven platform. You'll work closely with product, frontend, and AI teams to design, build, and scale backend systems that handle large-scale data, complex workflows, and real-time interactions. You'll join a small, high-calibre team where your ideas genuinely shape the direction of the product and the company.
FEATURED
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Senior Software Developer - Ruby
Senior Software Developer - Ruby
SUMMER-BROWNING ASSOCIATES LIMITED
E1, East London
£600 - £650 per day + competitive
Summer-Browning Associates are currently supporting our Central Government client who are seeking a Senior Software Engineer who is highly proficient with Ruby programming on an initial 12 month contract (London or Manchester - hybrid) * Work within a multi-disciplinary product team and lead the design, development, and maintenance of robust, scalable open data services and APIs * Provide strategic technical leadership by setting software architecture, engineering practices, and technical direction across the Team * Define and evolve scalable, secure design patterns and coding standards, ensuring alignment with standards and cross-government platforms * Collaborate with teams to select technologies, shape roadmaps, and deliver resilient, maintainable digital services that meet programme goals * Represent the department at technical forums, open-source communities, and
Summer-Browning Associates are currently supporting our Central Government client who are seeking a Senior Software Engineer who is highly proficient with Ruby programming on an initial 12 month contract (London or Manchester - hybrid) * Work within a multi-disciplinary product team and lead the design, development, and maintenance of robust, scalable open data services and APIs * Provide strategic technical leadership by setting software architecture, engineering practices, and technical direction across the Team * Define and evolve scalable, secure design patterns and coding standards, ensuring alignment with standards and cross-government platforms * Collaborate with teams to select technologies, shape roadmaps, and deliver resilient, maintainable digital services that meet programme goals * Represent the department at technical forums, open-source communities, and
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Data Storage Engineer
Data Storage Engineer
Deerfoot Recruitment Solutions
EC2, City of London, EC2Y 9AN
Up to £635.63 per day
Fully Onsite in London (EC2Y / Moorgate) International Banking Group £635.63pd Inside IR35 - 01/01/26 to 31/08/26?????? Are you ready to take ownership of cutting-edge data storage solutions across a major international banking group? As a Data Storage Engineer, you'll join a collaborative technical team with responsibility for designing, implementing, configuring and supporting mission-critical storage and backup infrastructure, including a Dell EMC environment, PowerStore, PowerScale/Isilon and ECM/Elastic Cloud Storage. Key Responsibilities * Manage and maintain block, file, and object data storage systems for business systems and end users. * Provide technical ownership and support for all online storage technologies, including connectivity and backup. * Deliver strategic projects, updates, and improvement plans for storage and backup systems.
Fully Onsite in London (EC2Y / Moorgate) International Banking Group £635.63pd Inside IR35 - 01/01/26 to 31/08/26?????? Are you ready to take ownership of cutting-edge data storage solutions across a major international banking group? As a Data Storage Engineer, you'll join a collaborative technical team with responsibility for designing, implementing, configuring and supporting mission-critical storage and backup infrastructure, including a Dell EMC environment, PowerStore, PowerScale/Isilon and ECM/Elastic Cloud Storage. Key Responsibilities * Manage and maintain block, file, and object data storage systems for business systems and end users. * Provide technical ownership and support for all online storage technologies, including connectivity and backup. * Deliver strategic projects, updates, and improvement plans for storage and backup systems.
FEATURED
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£40,000 to £90,000 (DOE) + performance bonus - Permanent - Hybrid - UK nationals only |Must hold SC clearance - About the Role - An innovative UK technology company is developing a next-generation AI platform designed for defence and health applications. Were looking for a Software Engineer who thrives on learning quickly, solving complex technical problems, and building systems that make a real-world impact. This is a genuine ground-floor opportunity to influence both the technology and your career path within a growing, mission-driven business. What Youll Work On * Design, build, and scale intelligent systems and microservices * Develop AI-driven capabilities (e.g. LLMs, retrieval-augmented generation (RAG), and AI agents) * Build and maintain APIs, data pipelines, and backend components (primarily Python, FastAPI, or Flask)
£40,000 to £90,000 (DOE) + performance bonus - Permanent - Hybrid - UK nationals only |Must hold SC clearance - About the Role - An innovative UK technology company is developing a next-generation AI platform designed for defence and health applications. Were looking for a Software Engineer who thrives on learning quickly, solving complex technical problems, and building systems that make a real-world impact. This is a genuine ground-floor opportunity to influence both the technology and your career path within a growing, mission-driven business. What Youll Work On * Design, build, and scale intelligent systems and microservices * Develop AI-driven capabilities (e.g. LLMs, retrieval-augmented generation (RAG), and AI agents) * Build and maintain APIs, data pipelines, and backend components (primarily Python, FastAPI, or Flask)
FEATURED
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About This Opportunity - We are supporting Welldone Consulting in their search for a founding Head of Delivery. This is a unique opportunity to establish, shape, and grow a business at the forefront of accessible mobile app consulting in the UK. About Welldone Consulting - Welldone Consulting focuses on building future-ready, inclusive, and commercially strategic mobile apps. Their mission is to help organisations not just comply with the European Accessibility Act but also to drive greater loyalty, adoption, and revenue by improving mobile user experiences for everyone. Role Purpose * Lead client engagements from initial contact to completion. * Develop frameworks for delivery and build an associate consultant model. * Serve as the public face and thought leader for the consultancy. Key Responsibilities - Client Engagement * Act as the main point of contact through p
About This Opportunity - We are supporting Welldone Consulting in their search for a founding Head of Delivery. This is a unique opportunity to establish, shape, and grow a business at the forefront of accessible mobile app consulting in the UK. About Welldone Consulting - Welldone Consulting focuses on building future-ready, inclusive, and commercially strategic mobile apps. Their mission is to help organisations not just comply with the European Accessibility Act but also to drive greater loyalty, adoption, and revenue by improving mobile user experiences for everyone. Role Purpose * Lead client engagements from initial contact to completion. * Develop frameworks for delivery and build an associate consultant model. * Serve as the public face and thought leader for the consultancy. Key Responsibilities - Client Engagement * Act as the main point of contact through p
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In 1914, Ernest Shackleton placed an advertisement seeking men for his Antarctic expeditionFor hazardousjourneyintounchartedterritory. Smallwages. Longhoursnavigatingcomplexity. Thousandsresponded. Today,weseekadifferentkindofpioneer;onewhowillchartthecoursethroughtheunexploredfrontierofartificial intelligence. We are not just implementing AI; we're defining what's possible. We're one of the first to venture into territories where others see only questions. Where they see complexity, we see opportunity. Wherethey see risk, we see the path forward. This role is looking for a talented AI Deployment Engineer who is keen to join a start-up! You will be joining a start-up with a mission to deploy cutting-edge AI systems for marketing businesses. This isn't about following playbooks, there are none. You'll be writing them. Every implementation is a first ascent.
In 1914, Ernest Shackleton placed an advertisement seeking men for his Antarctic expeditionFor hazardousjourneyintounchartedterritory. Smallwages. Longhoursnavigatingcomplexity. Thousandsresponded. Today,weseekadifferentkindofpioneer;onewhowillchartthecoursethroughtheunexploredfrontierofartificial intelligence. We are not just implementing AI; we're defining what's possible. We're one of the first to venture into territories where others see only questions. Where they see complexity, we see opportunity. Wherethey see risk, we see the path forward. This role is looking for a talented AI Deployment Engineer who is keen to join a start-up! You will be joining a start-up with a mission to deploy cutting-edge AI systems for marketing businesses. This isn't about following playbooks, there are none. You'll be writing them. Every implementation is a first ascent.
FTSE Russell is a leading global provider of financial services, specializing in the creation and management of indexes, data, and analytic solutions. A subsidiary of the London Stock Exchange Group (LSEG), FTSE Russell supports investors worldwide in making informed decisions across asset classes, investment strategies, and market segments. Its products are trusted by institutional and retail investors, asset managers, and pension funds to benchmark performance, build investment portfolios, and manage risk. With a reputation for innovation, transparency, and robust governance, FTSE Russell plays a critical role in shaping global financial markets. FTSE Russell is seeking a hands-on dynamic software development leader to drive a team of software engineers building robust equity index capabilities and indexes.
FTSE Russell is a leading global provider of financial services, specializing in the creation and management of indexes, data, and analytic solutions. A subsidiary of the London Stock Exchange Group (LSEG), FTSE Russell supports investors worldwide in making informed decisions across asset classes, investment strategies, and market segments. Its products are trusted by institutional and retail investors, asset managers, and pension funds to benchmark performance, build investment portfolios, and manage risk. With a reputation for innovation, transparency, and robust governance, FTSE Russell plays a critical role in shaping global financial markets. FTSE Russell is seeking a hands-on dynamic software development leader to drive a team of software engineers building robust equity index capabilities and indexes.
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Deep Azure expertise, with M365 ecosystem governance: Power Platform, E5 optimisation, Azure integration services such as Logic Apps, Service Bus, Event Grid, API Management).
Deep Azure expertise, with M365 ecosystem governance: Power Platform, E5 optimisation, Azure integration services such as Logic Apps, Service Bus, Event Grid, API Management).
NEW
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Knowledge of RESTful API development and integration.
Knowledge of RESTful API development and integration.
NEW
RESTful API development
RESTful API development
NEW
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Senior Quality Assurance Engineer
Senior Quality Assurance Engineer
Alexander Edward James Consulting Limited
EC2, City of London
From £60,000 to £80,000 per annum
Build and expand API-level test coverage for distributed and event-driven services.
Build and expand API-level test coverage for distributed and event-driven services.
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Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
NEW
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Apply DevOps concepts and use Azure ADB2C and cloud services (API management, App Service, Azure configurations).
Apply DevOps concepts and use Azure ADB2C and cloud services (API management, App Service, Azure configurations).
NEW
Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
NEW
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Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
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4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
NEW
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Drive architectural decisions across all software systems (cloud, mobile, and API layers).
Drive architectural decisions across all software systems (cloud, mobile, and API layers).
PREMIUM
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Champion API-first designs and determine best practices for automation tools such as Power Automate Desktop. * Design secure integration layers using Azure services such as API Management, Service Bus, Functions, Logic Apps, and Key Vault. * Advanced experience with Azure integration tools - API Management, Service Bus, Logic Apps, Functions, and Key Vault.
Champion API-first designs and determine best practices for automation tools such as Power Automate Desktop. * Design secure integration layers using Azure services such as API Management, Service Bus, Functions, Logic Apps, and Key Vault. * Advanced experience with Azure integration tools - API Management, Service Bus, Logic Apps, Functions, and Key Vault.
FEATURED
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SharePoint Developer
SharePoint Developer
PPF (Pension Protection Fund)
CR0, Croydon
From £56,000 to £61,500 per annum plus Civil Service pension and other
You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
NEWFEATURED
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RESTful API design and development
RESTful API design and development
NEW
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Data exchange and processing skills (e.g. ETL, ESB, API...)
Data exchange and processing skills (e.g. ETL, ESB, API...)
NEWFEATURED
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Senior Backend Engineer (Platform & Security)
Senior Backend Engineer (Platform & Security)
Ventula Consulting Limited
The City, EC3V 9DU
Up to £140,000 per annum
Strong understanding of distributed systems, microservices architecture, and API design.
Strong understanding of distributed systems, microservices architecture, and API design.
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Understanding of secure architecture, API design, and performance optimisation.
Understanding of secure architecture, API design, and performance optimisation.
NEW
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REST API Design Principles
REST API Design Principles
NEW
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As the leader of the Shipping Platform product, you will guide a team of product managers in delivering cutting-edge solutions across both mobile, web and API platforms at a global scale, ensuring alignment with eBays strategic goals around driving GMV and revenues.
As the leader of the Shipping Platform product, you will guide a team of product managers in delivering cutting-edge solutions across both mobile, web and API platforms at a global scale, ensuring alignment with eBays strategic goals around driving GMV and revenues.
NEW
Related Jobs
Locations
- The City, City (EC3)
- Ireland
- Southwark
- The Borough
- The City, City (EC4)
- Clerkenwell
- Euston
- Frimley
- Kennington
- Mayfair
- City of London
- Reading
- South East London
- Cambridge
- South West London
- Central London
- West End
- Abingdon
- Milton Keynes
- Northampton
- London
- Berkshire
- Cambridgeshire
- Hampshire
- Surrey
- Hertfordshire
- Oxfordshire
- Bedfordshire
- Buckinghamshire
- Northamptonshire
- South East
- East Anglia
- East Midlands
- Midlands
- South West