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97 API jobs in Holborn, Central London + 20 miles
412 exact matches jobs are outside your preferred location
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Full Stack Developer - DV Cleared - Hybrid - Various Locations
Full Stack Developer - DV Cleared - Hybrid - Various Locations
Experis
UK
£60000 - £120000 per annum + Excellent Benefits
Full Stack Developer - Must have an Active DV Clearance - Hybrid - Location: Bristol, London, Manchester or Cambridge - Salary: £70,000 - £120,000 (depending on experience and clearance) We are looking for a Full Stack Developer to join a growing public sector team delivering secure, high-impact digital services across Defence & Security. This is a unique opportunity to use your development expertise to help solve real-world challenges for government and national security clients. You'll work on meaningful projects in an agile environment, applying your skills across the full software development lifecycle - from design through to deployment. You'll be part of a collaborative and supportive engineering team, working alongside technical leads, project managers, and stakeholders to deliver robust and scalable solutions.
Full Stack Developer - Must have an Active DV Clearance - Hybrid - Location: Bristol, London, Manchester or Cambridge - Salary: £70,000 - £120,000 (depending on experience and clearance) We are looking for a Full Stack Developer to join a growing public sector team delivering secure, high-impact digital services across Defence & Security. This is a unique opportunity to use your development expertise to help solve real-world challenges for government and national security clients. You'll work on meaningful projects in an agile environment, applying your skills across the full software development lifecycle - from design through to deployment. You'll be part of a collaborative and supportive engineering team, working alongside technical leads, project managers, and stakeholders to deliver robust and scalable solutions.
PREMIUM
The LSEG DevSecOps Engineering team inside the cyber security division is looking for Senior Software Engineers to build tools and automations to help secure software development for thousands of developers across the group. You will be working as part of a geographically distributed remote team comprising of security engineers and software engineers. Our teams mission is to allow engineers to embed security best practices frictionlessly as part of their day to day work. * Deep understanding of cyber security principles, secure software development, and threat modeling * Experience conducting security assessments, code reviews, and vulnerability management across diverse technology stacks * Experience in building full-stack products (web applications, APIs, CI tooling or low-level software) * Hands-on experience with cloud technologies (AWS, GCP, Azure) and containers
The LSEG DevSecOps Engineering team inside the cyber security division is looking for Senior Software Engineers to build tools and automations to help secure software development for thousands of developers across the group. You will be working as part of a geographically distributed remote team comprising of security engineers and software engineers. Our teams mission is to allow engineers to embed security best practices frictionlessly as part of their day to day work. * Deep understanding of cyber security principles, secure software development, and threat modeling * Experience conducting security assessments, code reviews, and vulnerability management across diverse technology stacks * Experience in building full-stack products (web applications, APIs, CI tooling or low-level software) * Hands-on experience with cloud technologies (AWS, GCP, Azure) and containers
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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 personalisation and semantic relevance.
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 personalisation and semantic relevance.
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Role Full Stack Developer - Location - London (Remote) Salary - £70K - £85K - Role Type Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Overview - Are you a talented Full Stack Developer eager to make an immediate impact on exciting projects? Our client is seeking an experienced Full Stack development professional for a hybrid position to be based in Central London, but operating remotely * Design and implement robust web applications using cutting-edge technologies and frameworks. * Collaborate with cross-functional teams to drive the full development lifecycle, from concept to deployment. * Engage in continuous learning and professional development, enhancing your skills and career prospects.
Role Full Stack Developer - Location - London (Remote) Salary - £70K - £85K - Role Type Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Overview - Are you a talented Full Stack Developer eager to make an immediate impact on exciting projects? Our client is seeking an experienced Full Stack development professional for a hybrid position to be based in Central London, but operating remotely * Design and implement robust web applications using cutting-edge technologies and frameworks. * Collaborate with cross-functional teams to drive the full development lifecycle, from concept to deployment. * Engage in continuous learning and professional development, enhancing your skills and career prospects.
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RESTful API design/integration knowledge
RESTful API design/integration knowledge
NEWFEATURED
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Do you bring a breadth of technical expertise across reservation systems, Dynamics CRM, and API design? * Deep technical expertise across API design, integration layers, and data flow management.
Do you bring a breadth of technical expertise across reservation systems, Dynamics CRM, and API design? * Deep technical expertise across API design, integration layers, and data flow management.
NEWFEATURED
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Senior Developer – Elasticsearch or OpenSearch – OUTSIDE IR35
Senior Developer – Elasticsearch or OpenSearch – OUTSIDE IR35
Smart Sourcer Limited
UK
From £450 to £500 per day Fully remote
Experience leveraging AWS cloud-native technologies to ensure scalability & reliability (inc. Lambda, ECS, API Gateway, SQS)
Experience leveraging AWS cloud-native technologies to ensure scalability & reliability (inc. Lambda, ECS, API Gateway, SQS)
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API Development
API Development
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Experience with REST API testing and scripting in Python, JavaScript, TypeScript, or Bash.
Experience with REST API testing and scripting in Python, JavaScript, TypeScript, or Bash.
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Experience building maintainable and testable code bases, including API design and unit testing techniques
Experience building maintainable and testable code bases, including API design and unit testing techniques
Experience building maintainable and testable code bases, including API design and unit testing techniques
Experience building maintainable and testable code bases, including API design and unit testing techniques
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Strong understanding of JSON data structures and API calls.
Strong understanding of JSON data structures and API calls.
NEWFEATURED
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Have practical knowledge of C#, Web API testing, Azure portal
Have practical knowledge of C#, Web API testing, Azure portal
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Technical Lead
Technical Lead
Zorba Consulting
UK
From £60,000 to £70,000 per annum 28 days hols, health insurance, soci
Join a fast-growing HR software company as a Technical Lead for their Integration team with Client Facing experience, leading/mentoring technical teams and API development & integrations experience (C#, .NET, SQL Server). * 4+ years experience in API development and integrations (REST, SOAP, GraphQL) * Expertise in AWS services (Lambda, API Gateway, S3, DynamoDB, SQS, SNS)
Join a fast-growing HR software company as a Technical Lead for their Integration team with Client Facing experience, leading/mentoring technical teams and API development & integrations experience (C#, .NET, SQL Server). * 4+ years experience in API development and integrations (REST, SOAP, GraphQL) * Expertise in AWS services (Lambda, API Gateway, S3, DynamoDB, SQS, SNS)
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Skilled in integrating third-party services, including API management (e.g., Google Apigee) and Identity Access Management (e.g., Okta).
Skilled in integrating third-party services, including API management (e.g., Google Apigee) and Identity Access Management (e.g., Okta).
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The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
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The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
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Understanding of web services (HTTP, Web API, Web protocols)
Understanding of web services (HTTP, Web API, Web protocols)
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Senior Java Engineering Lead - Digital Markets Infrastructure
Senior Java Engineering Lead - Digital Markets Infrastructure
London Stock Exchange
South East
Competitive
Solid understanding of REST API design principles.
Solid understanding of REST API design principles.
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FIEQ Product, BNY London - At BNY, our culture allows us to run our company better and enables employees growth and success. As a leading global financial services company at the heart of the global financial system, we influence nearly 20% of the worlds investible assets. Every day, our teams harness cutting-edge AI and breakthrough technologies to collaborate with clients, driving transformative solutions that redefine industries and uplift communities worldwide. Recognized as a top destination for innovators and champions of inclusion, BNY is where bold ideas meet advanced technology and exceptional talent. Together, we power the future of finance and this is what #LifeAtBNY is all about. Join us and be part of something extraordinary. The Markets business helps our clients formulate, implement and operationalize their investment strategies.
FIEQ Product, BNY London - At BNY, our culture allows us to run our company better and enables employees growth and success. As a leading global financial services company at the heart of the global financial system, we influence nearly 20% of the worlds investible assets. Every day, our teams harness cutting-edge AI and breakthrough technologies to collaborate with clients, driving transformative solutions that redefine industries and uplift communities worldwide. Recognized as a top destination for innovators and champions of inclusion, BNY is where bold ideas meet advanced technology and exceptional talent. Together, we power the future of finance and this is what #LifeAtBNY is all about. Join us and be part of something extraordinary. The Markets business helps our clients formulate, implement and operationalize their investment strategies.
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See yourself at Dataminr - As a Senior Product Manager, Cybersecurity, you'll lead the development of cutting-edge, AI-powered cybersecurity products at Dataminr. In this role you'll be on the front lines, defining and delivering revolutionary, AI-powered products that solve the most critical security challenges. You'll work with world-class engineers and data scientists to turn groundbreaking ideas into market-defining solutions. This role is for a builder who thrives on fast-paced, high-impact worksomeone who is just as comfortable shaping product strategy as they are digging into the latest LLMs for threat detection. This remote position is open to candidates who are located in the UK or Ireland. AI Innovation at Dataminr - Working at Dataminr youll have the opportunity to tackle the most exciting trends in AI on a daily basis to power a revolutionary product that
See yourself at Dataminr - As a Senior Product Manager, Cybersecurity, you'll lead the development of cutting-edge, AI-powered cybersecurity products at Dataminr. In this role you'll be on the front lines, defining and delivering revolutionary, AI-powered products that solve the most critical security challenges. You'll work with world-class engineers and data scientists to turn groundbreaking ideas into market-defining solutions. This role is for a builder who thrives on fast-paced, high-impact worksomeone who is just as comfortable shaping product strategy as they are digging into the latest LLMs for threat detection. This remote position is open to candidates who are located in the UK or Ireland. AI Innovation at Dataminr - Working at Dataminr youll have the opportunity to tackle the most exciting trends in AI on a daily basis to power a revolutionary product that
Commercial experience of integrating Power Platform with third party API services and performing data migrations using appropriate integration tools (Kingswaysoft SSIS etc)
Commercial experience of integrating Power Platform with third party API services and performing data migrations using appropriate integration tools (Kingswaysoft SSIS etc)
Experience with API design and development (OpenAPI, REST, gRPC)
Experience with API design and development (OpenAPI, REST, gRPC)
Experience: 10+ Years in Web Automation, 4+ Years in Python, 2+ Years in API, 2+ Years in SQL. * Automate API testing and integration workflows using Python libraries (e.g., requests, httpx). * Perform data-driven API testing, including authentication handling and response validation. * Practical knowledge of API testing using Postman and Python-based tools.
Experience: 10+ Years in Web Automation, 4+ Years in Python, 2+ Years in API, 2+ Years in SQL. * Automate API testing and integration workflows using Python libraries (e.g., requests, httpx). * Perform data-driven API testing, including authentication handling and response validation. * Practical knowledge of API testing using Postman and Python-based tools.
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Tyk is an API Management platform helping to drive the connected world by enabling organizations to connect their systems and services. Our mission is to enable interconnectivity between systems and devices, starting with our API Management platform. As a Mid-Level Full-Stack Engineer (React + Go) at Tyk, you'll be responsible for designing and building compelling solutions for our Dashboard and API Gateway products. * Contribute to the direction of dashboard UI development and API functionality * Understanding of distributed systems design fundamentals and secure API design (REST and/or gRPC) * API management experience * Deliver high-quality UI and API code that meets requirements and improves performance and accessibility
Tyk is an API Management platform helping to drive the connected world by enabling organizations to connect their systems and services. Our mission is to enable interconnectivity between systems and devices, starting with our API Management platform. As a Mid-Level Full-Stack Engineer (React + Go) at Tyk, you'll be responsible for designing and building compelling solutions for our Dashboard and API Gateway products. * Contribute to the direction of dashboard UI development and API functionality * Understanding of distributed systems design fundamentals and secure API design (REST and/or gRPC) * API management experience * Deliver high-quality UI and API code that meets requirements and improves performance and accessibility