API Development Jobs in London

76 to 100 of 115 API Development Jobs in London

Senior Backend Engineer

London, United Kingdom
Hybrid / WFH Options
NALA
us in building Payments for the Next Billion Your Mission Help us enhance the digital payment systems and infrastructure for the African and Asian continent by contributing to the development & design of our core components and tools of our Rafiki web service API. If you'd like to learn more about what our teams are focusing on, tech stack … offering to continue to deliver on our mission of increasing economic opportunities for working migrants globally. Specifically we want to open up NALA's payment rails to customers via API, enabling corporates to send, receive and convert funds through NALA directly from their own systems. We are deeply passionate about the communities we serve and we hope you will … data to drive decision making and identify customer insights Automate processes and partner failover to reduce support load and keep our customers happy Contribute to our customer-facing REST API core functionalities Must-have requirements You have at least 5+ years of experience building highly reliable and scalable backend services in Go Experience with RDBMSs such as Postgres, MySQL More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Backend Data Engineer

London, United Kingdom
SimilarWeb
focal point, promoting best practices and enforcing architectural and coding standards. Qualifications: - BSc degree in Computer Science or equivalent practical experience. - At least 4+ years of server-side software development experience in languages such asPython, Java, Scala, or Go. - Experience withBig Datatechnologies likeSpark, Databricks,andAirflow. - Familiarity with cloud environments such asAWSor GCP and containerization technologies likeDockerandKubernetes. - Strong problem-solving … skills and ability to learn new technologies quickly. - Excellent communication skills and ability to work in a team-oriented environment. Nice to Have: - Familiarity with Microservices architecture and API development. - Knowledge of databases like Redis, PostgreSQL, and DWH (such as Redshift, Snowflake, etc.). We will handle your application and information related to your application in accordance with the … Python/Java/Scala/Go? Select Do you have experience with Big Data Technologies like Spark, Databricks,andAirflow? Do you have any experience with Microservices architecture and API development? If yes, please describe briefly. What are you salary expectations? Do you require visa sponsorship to work in the UK? Select More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Python Developer

London, United Kingdom
Boston Hale
a critical platform for a Central Government body. We're seeking a seasoned Python, Postgres & React Developer to join a lean, agile team. You'll be hands-on developing API integrations, automation, and building a clean, maintainable codebase within a pragmatic, minimal tech stack. The environment is start-up-like - flexibility is essential. You'll wear multiple hats, operate … solutions without needing handholding. Key Skills: Strong Python & Postgres experience are a must JavaScript & React proficiency would be valuable - but not essential as they have a dedicated React Developer API development & integration expertise Automation workflows We need a contractor who thrives in ambiguity, values simplicity in solutions, and can crack on with little oversight. If you're a More ❯
Employment Type: Contract
Rate: £400 - £475/day OUTSIDE IR35
Posted:

Python Developer

City of London, London, England, United Kingdom
Boston Hale
a critical platform for a Central Government body. We're seeking a seasoned Python, Postgres & React Developer to join a lean, agile team. You'll be hands-on developing API integrations, automation, and building a clean, maintainable codebase within a pragmatic, minimal tech stack. The environment is start-up-like - flexibility is essential. You'll wear multiple hats, operate … solutions without needing handholding. Key Skills: Strong Python & Postgres experience are a must JavaScript & React proficiency would be valuable - but not essential as they have a dedicated React Developer API development & integration expertise Automation workflows We need a contractor who thrives in ambiguity, values simplicity in solutions, and can crack on with little oversight. If you're a More ❯
Employment Type: Contractor
Rate: £400 - £475 per day
Posted:

.Net Core Engineer in London - Quant Capital

London, United Kingdom
Blockchain Works
services C# Queues TypeScript Docker Angular NodeJS CI SQL Server Document databases Hands-on experience writing automated tests including unit tests Technology .Net Core, Blockchain Challenges Greenfield Blockchain platform, API development, industry-specific challenges Company Details Well-known fintech50 business located in the City of London with a 30-member flat Dev Team Compensation £80k salary, Bonus, Training More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Head of Technology and Product (London)

Wandsworth, Greater London, UK
Beryl
We're looking for an experienced leader who thrives in a product-led, data-driven environment with real world impact. The role sits at the intersection of technology, product development, and operations, and is central to our continued growth building on a mature set of technologies with a strong customer base. Our micromobility services operate through a combination of … customer facing applications, physical technologies enabling thousands of journeys every day and management systems that keep our vehicles safe. This includes development of hardware, embedded and software engineering teams. We are looking for somebody with the experience to work across these areas, leading software engineering, industrial design and collaborating with manufacturing partners. As Head of Technology and Product, you … the strategic direction of our digital and physical systems that power our vehicle share services. Working with the CIO you will make decisions across all aspects of engineering and development to deliver products that improve the performance of our schemes, and drive revenue growth.. You will ensure our technology underpins a seamless and scalable integration between our physical vehicles More ❯
Employment Type: Full-time
Posted:

Full Stack Developer

London, South East, England, United Kingdom
Rise Technical Recruitment Limited
small, accomplished team with a proven track record of successfully building companies from the ground up. They are now seeking a developer to design the architecture and lead the development of back-end services and web applications.The ideal candidate will have a robust background in AWS, Node.js, and React, along with expertise in NoSQL databases, RESTful API design … and development, product development, and deployment of applications on both iOS and Android platforms. A strong business orientation and pragmatic approach are essential, with a demonstrated ability to align deliverables with corporate vision while understanding and maximizing their business value.This is an excellent opportunity for a Full Stack Developer to join a company at the forefront of creating … role provides a clear pathway for career progression, with the potential to advance to a directorship position in a rapidly expanding market. The Role: Shaping the architecture and the development of back-end services and web applications AWS, React, Node, NoSQL Define and own the technical strategy for back-end and front-ends 1 day a week on site More ❯
Employment Type: Full-Time
Salary: £60,000 - £70,000 per annum
Posted:

Full Stack Developer

London, United Kingdom
Rise Technical Recruitment
small, accomplished team with a proven track record of successfully building companies from the ground up. They are now seeking a developer to design the architecture and lead the development of back-end services and web applications. The ideal candidate will have a robust background in AWS, Node.js, and React, along with expertise in NoSQL databases, RESTful API design and development, product development, and deployment of applications on both iOS and Android platforms. A strong business orientation and pragmatic approach are essential, with a demonstrated ability to align deliverables with corporate vision while understanding and maximizing their business value. This is an excellent opportunity for a Full Stack Developer to join a company at the … role provides a clear pathway for career progression, with the potential to advance to a directorship position in a rapidly expanding market. The Role: Shaping the architecture and the development of back-end services and web applications AWS, React, Node, NoSQL Define and own the technical strategy for back-end and front-ends 1 day a week on site More ❯
Employment Type: Permanent
Salary: £60000 - £70000/annum + Equity
Posted:

Software Engineer

London, United Kingdom
Upscope
and keen to connect with great developers ready to grow with us Location: Soho, London (onsite 4 days a week) Salary: Approx. £50.000 annually, depending on experience Main responsibilities Development and Design: Write clean, efficient, and maintainable code using TypeScript, JavaScript, Node.js, and React. Design and implement robust applications and services to meet predefined requirements. Code Review and Quality … a timely and effective manner. Continuous Learning: Stay up-to-date with new technologies and industry trends relevant to our tech stack. Actively contribute to the improvement of our development processes. Documentation: Create and maintain comprehensive documentation for the systems and processes developed, ensuring clarity for future maintenance and scalability. About you Strong proficiency in TypeScript, JavaScript (ES6+), Node.js … and React, with a solid understanding of their ecosystems. Experience with modern development tools and practices, such as Git, CI/CD pipelines, automated testing frameworks (e.g., Jest, Mocha), and containerisation technologies (e.g., Docker). Knowledge of RESTful API design and development, and familiarity with web services architecture. Ability to write efficient, secure, well-documented, and clean More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Software Engineer London HQ

London, United Kingdom
Upscope
great developers ready to grow with us Location: Soho, London (onsite 4 days a week) Salary: Based on experience Must hold right to work in the UK. Main responsibilities Development and Design: Write clean, efficient, and maintainable code using TypeScript, JavaScript, Node.js, and React. Design and implement robust applications and services to meet predefined requirements. Code Review and Quality … a timely and effective manner. Continuous Learning: Stay up-to-date with new technologies and industry trends relevant to our tech stack. Actively contribute to the improvement of our development processes. Documentation: Create and maintain comprehensive documentation for the systems and processes developed, ensuring clarity for future maintenance and scalability. About you At least 3-5 years of professional … experience building modern web applications. Strong proficiency in TypeScript, JavaScript (ES6+), Node.js, and React, with a solid understanding of their ecosystems. Experience with modern development tools and practices, such as Git, CI/CD pipelines, automated testing frameworks (e.g., Jest, Mocha), and containerisation technologies (e.g., Docker). Knowledge of RESTful API design and development, and familiarity with More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Lead Engineer

London, United Kingdom
Daphne Technologies LLC
including code reviews, testing standards, CI/CD pipelines, and monitoring strategies for production NestJS/React applications. Qualifications 6+ years of full-stack engineering experience in SAAS and API development including deep expertise in Node.js/NestJS, PostgreSQL optimization, and React applications. A pragmatic mindset: you know when to ship and when to refactor. Excellent communication and More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Head of Engineering: Ecommerce

London, United Kingdom
Rewardgateway
Engineering team toward the creation of a global marketplace meeting the needs of both users and merchants. You will oversee delivery across both web and mobile apps with an API-first cloud-based approach, applying your knowledge to simplify and refine operational processes. Key Responsibilities Lead initiatives to enhance the e-commerce capabilities, aligning with the trend towards personalised … mobile-first shopping experiences. Contribute to the definition and delivery of Engineering roadmaps, anticipating technical challenges and managing interdependencies. Oversee the entire software development lifecycle, from conception to deployment and maintenance, ensuring high-quality outcomes across all phases. Implement best practices in coding, testing, and maintenance to enhance system scalability and performance, particularly for high-traffic events. Ensure compliance … large teams or projects in an eCommerce environment with Gross Merchandise Value above $500M. Deep understanding of global payment and regulations related to eCommerce platforms. Strong technical expertise in API development, coupled with a deep understanding of software architecture and design patterns. Expertise in cloud technologies, particularly AWS, with the ability to deploy and manage scalable cloud-based More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Head of Engineering: Ecommerce (London)

London, UK
Rewardgateway
Engineering team toward the creation of a global marketplace meeting the needs of both users and merchants. You will oversee delivery across both web and mobile apps with an API-first cloud-based approach, applying your knowledge to simplify and refine operational processes. Key Responsibilities Lead initiatives to enhance the e-commerce capabilities, aligning with the trend towards personalised … mobile-first shopping experiences. Contribute to the definition and delivery of Engineering roadmaps, anticipating technical challenges and managing interdependencies. Oversee the entire software development lifecycle, from conception to deployment and maintenance, ensuring high-quality outcomes across all phases. Implement best practices in coding, testing, and maintenance to enhance system scalability and performance, particularly for high-traffic events. Ensure compliance … large teams or projects in an eCommerce environment with Gross Merchandise Value above $500M. Deep understanding of global payment and regulations related to eCommerce platforms. Strong technical expertise in API development, coupled with a deep understanding of software architecture and design patterns. Expertise in cloud technologies, particularly AWS, with the ability to deploy and manage scalable cloud-based More ❯
Employment Type: Full-time
Posted:

Technical Services Engineer

London, United Kingdom
Hybrid / WFH Options
Intapp
Technical Services Engineer London , hybrid working We are looking for a Technical Services Engineer to join our growing team. Our engineers are responsible for the technical development and delivery of our product and integrations. They deliver expert guidance to clients, our partners and the larger Intapp teams in order to help us improve processes to ensure we are delivering … tools Results-oriented, resourceful and comfortable working under tight deadlines with a demanding set of internal and external customers Demonstrate 5+ years of professional experience working on software or API development Excellent interpersonal skills and ability to explain software to non-technical users Degree in Engineering, Computer Science or related technical field, or equivalent practical experience Self-starter … skills including organizational and administrative skills Intellectual curiosity and motivated for continual learning Extensive web technology knowledge and understanding: Web based Request/Response cycles Consuming RESTful and SOAP API's Synchronous and Asynchronous communications Databases & T-SQL (relational, queries, joins, procedures, performance) What you will gain at Intapp: At Intapp, you'll get the opportunity to bring your More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Mulesoft Technical Lead

South East London, London, United Kingdom
LA International Computer Consultants Ltd
the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration … modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions. Required Skills: Good experience of: integration concepts & technologies. MuleSoft Anypoint Platform & components (Mule ESB, API Manager, CloudHub, etc.) Java programming & experience with other programming languages such as XML, JSON, SQL Agile software development methodologies. Cloud-based integration platforms such as Amazon Web Services … AWS) or Microsoft Azure. API design and development. Knowledge of RESTful web services, SOAP, & other integration protocols Familiarity with API design & development best practices Strong problem-solving skills & ability to troubleshoot integration issues. Good communication & teamwork skills Strong understanding of Agile development methodologies & experience working in an Agile environment Nice to Have Skills: Experience with cloud More ❯
Employment Type: Contract
Rate: £700 - £765 per day
Posted:

Backend Software Engineer Golang Kafka - Start-up

City of London, London, United Kingdom
Hybrid / WFH Options
Client Server
Backend Software Engineer/Developer (Golang Kafka API) London/WFH to £110k Do you have a deep knowledge of Go/Golang combined with software architecture and design skills? You could be progressing your career as a Backend Software Engineer at a start-up payments technology company that is revolutionising the payments industry to Africa, improving speed, cost … days a week (also the possibility to be remote in the UK). About you: You're an experience backend focussed Software Engineer with strong commercial Go/Golang development experience You have experience with system design, event driven architectures, Kafka, API development You have a product based mindset and commercial acumen You have a thorough understanding … to £110k Hybrid working (x3 days office) Impactful role with excellent career growth opportunities Apply now to find out more about this Backend Software Engineer/Developer (Golang Kafka API) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people More ❯
Employment Type: Permanent, Work From Home
Posted:

Backend Software Engineer Golang Kafka - Start-up

London, South East, England, United Kingdom
Hybrid / WFH Options
Client Server Ltd
Backend Software Engineer/Developer (Golang Kafka API) London/WFH to £110k Do you have a deep knowledge of Go/Golang combined with software architecture and design skills? You could be progressing your career as a Backend Software Engineer at a start-up payments technology company that is revolutionising the payments industry to Africa, improving speed, cost … days a week (also the possibility to be remote in the UK). About you: You're an experience backend focussed Software Engineer with strong commercial Go/Golang development experience You have experience with system design, event driven architectures, Kafka, API development You have a product based mindset and commercial acumen You have a thorough understanding … to £110k Hybrid working (x3 days office) Impactful role with excellent career growth opportunities Apply now to find out more about this Backend Software Engineer/Developer (Golang Kafka API) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people More ❯
Employment Type: Full-Time
Salary: £90,000 - £110,000 per annum
Posted:

Solution Architect (London)

London, UK
Crone Corkill
have relevant experience as a Solution Architect within the Insurance sector to be considered for this role. What will you do as a Solution Architect ? Take accountability for the development, agreement and maintenance of an end-to-end solution architecture for the project - Ensuring you meet business requirements and align to the overall blueprint Collaborate with stakeholders, tech SMEs … performing digital experiences in insurance for customers and staff Strong EIS/Guidewire or other Core Insurance platform provider expertise Strong Azure Integration technologies experience, including web services and API development (ideally with domain driven design exposure) Knowledge of Microsoft Dynamics 365 Sales and Service (including marketing automation technologies) Working knowledge of Amazon Connect Telephony technologies and integration More ❯
Employment Type: Full-time
Posted:

Solution Architect

City of Westminster, London, England, United Kingdom
Crone Corkill
have relevant experience as a Solution Architect within the Insurance sector to be considered for this role. What will you do as a Solution Architect Take accountability for the development, agreement and maintenance of an end-to-end solution architecture for the project – Ensuring you meet business requirements and align to the overall blueprint Collaborate with stakeholders, tech SMEs … performing digital experiences in insurance for customers and staff Strong EIS/Guidewire or other Core Insurance platform provider expertise Strong Azure Integration technologies experience, including web services and API development (ideally with domain driven design exposure) Knowledge of Microsoft Dynamics 365 Sales and Service (including marketing automation technologies) Working knowledge of Amazon Connect Telephony technologies and integration More ❯
Employment Type: Temporary
Salary: £550 - £600 per day, Negotiable
Posted:

Lead Data Engineer

London, United Kingdom
Endeavour Recruitment Solutions
days onsite - 3 days remote. Our client is looking for an experienced Lead Data Engineer with the following skill set: Experience with Azure data services, Azure Data Factory (ADF), API development and integration, Databricks, Python programming, Unit testing, GIT version control, Data management and data governance, Data security. If this is you, get in touch ASAP and send More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Software Architect - Central London - Swift - £85,000 + Benefits

London, United Kingdom
Ventula Consulting
background as a Software Architect or Lead Engineer. Strong experience with Swift, particularly in mobile app development. Strong Experience working with APIs Exposure to Swift Vapor for Server Side API development (desirable, not essential). Proficiency in modern JavaScript/TypeScript stacks - Node.js, Angular. Experience in small or mid-sized software companies. Strong communication and collaboration skills. Salary More ❯
Employment Type: Permanent
Salary: GBP 85,000 Annual
Posted:

Senior Data Engineer

London, South East, England, United Kingdom
Hybrid / WFH Options
Tenth Revolution Group
Data Engineering: AWS (Aurora, DMS, Lambda, Kinesis), Azure Data Factory Streaming & CDC: Apache Kafka, AWS Kinesis, change data capture AI/Vector Search: Pinecone, Weaviate, or Chroma with LangChain API Development: RESTful services, 3rd-party system integrations Production Standards: Monitoring, logging, cost optimisation, error handling Ideal Candidate Senior-level engineer with proven experience delivering client-facing demos or More ❯
Employment Type: Contractor
Rate: £400 - £450 per day
Posted:

Head of Engineering

London, United Kingdom
Rewardgateway
team toward the creation of a global wellbeing platform meeting the needs of both users and merchants. You will oversee delivery across both web and mobile apps with an API-first cloud-based approach, applying your knowledge to simplify and refine operational processes. Key Responsibilities Lead initiatives to enhance the fitness and wellness capabilities in our platform, aligning with … the trend towards personalised mobile-first wellness experiences. Contribute to the definition and delivery of Engineering roadmaps, anticipating technical challenges and managing interdependencies. Oversee the entire software development lifecycle, from conception to deployment and maintenance, ensuring high-quality outcomes across all phases. Implement best practices in coding, testing, and maintenance to enhance system scalability and performance particularly for high … managing teams or projects in a user-centric fitness and wellness area. Understanding of machine learning techniques in the context of fitness and wellness technology. Strong technical expertise in API development, coupled with a deep understanding of software architecture and design patterns. Expertise in cloud technologies, particularly AWS, with the ability to deploy and manage scalable cloud-based More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Head of Engineering (London)

London, UK
Rewardgateway
team toward the creation of a global wellbeing platform meeting the needs of both users and merchants. You will oversee delivery across both web and mobile apps with an API-first cloud-based approach, applying your knowledge to simplify and refine operational processes. Key Responsibilities Lead initiatives to enhance the fitness and wellness capabilities in our platform, aligning with … the trend towards personalised mobile-first wellness experiences. Contribute to the definition and delivery of Engineering roadmaps, anticipating technical challenges and managing interdependencies. Oversee the entire software development lifecycle, from conception to deployment and maintenance, ensuring high-quality outcomes across all phases. Implement best practices in coding, testing, and maintenance to enhance system scalability and performance particularly for high … managing teams or projects in a user-centric fitness and wellness area. Understanding of machine learning techniques in the context of fitness and wellness technology. Strong technical expertise in API development, coupled with a deep understanding of software architecture and design patterns. Expertise in cloud technologies, particularly AWS, with the ability to deploy and manage scalable cloud-based More ❯
Employment Type: Full-time
Posted:

Data & AI Consultant

London, United Kingdom
Hybrid / WFH Options
Tenth Revolution Group
AWS (Aurora, DMS, Lambda, Kinesis), Azure Data Factory Real-time Streaming: Apache Kafka, AWS Kinesis, change data capture (CDC) Vector Databases: Pinecone, Weaviate, or Chroma etc. with LangChain integration API Development: RESTful services, third-party integrations Production Systems: Enterprise-grade monitoring, error handling, cost optimisation Outside IR35 Fully Remote Immediate start 3-6 Month Contract Please send CV More ❯
Employment Type: Contract
Rate: £350 - £450/day
Posted:
API Development
London
10th Percentile
£54,375
25th Percentile
£65,000
Median
£77,500
75th Percentile
£100,000
90th Percentile
£115,000