101 to 125 of 201 API Design Jobs in the UK

Technical Architect

Hiring Organisation
McGregor Boyall Associates Limited
Location
South East, United Kingdom
Employment Type
Contract
Processing, and Cash & FX. You'll act as the technical authority within delivery teams, driving architecture strategy, governance, and engineering best practice. Key Responsibilities Design modern microservices and event-driven architectures using technologies such as Kafka, REST APIs and cloud platforms. Lead architecture governance, technical reviews, non-functional requirements … Processing Strong software engineering background in Java, Spring Boot, Oracle and SQL databases. Proven experience with: Microservices architecture Event-driven systems (Kafka, MQ, Solace) API design and integration AWS and/or Snowflake Knowledge of SWIFT MT, ISO 20022 and post-trade processing workflows. Experience operating within enterprise ...

Technical Architect

Hiring Organisation
McGregor Boyall
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£750.00 - £850.00 per day
Processing, and Cash & FX. You'll act as the technical authority within delivery teams, driving architecture strategy, governance, and engineering best practice. Key Responsibilities Design modern microservices and event-driven architectures using technologies such as Kafka, REST APIs and cloud platforms. Lead architecture governance, technical reviews, non-functional requirements … Processing Strong software engineering background in Java, Spring Boot, Oracle and SQL databases. Proven experience with: Microservices architecture Event-driven systems (Kafka, MQ, Solace) API design and integration AWS and/or Snowflake Knowledge of SWIFT MT, ISO 20022 and post-trade processing workflows. Experience operating within enterprise ...

Lead Software Engineer

Location
United Kingdom
adherence to established code review standards Ensure defined quality gates are consistently met for the project Promote clean, maintainable, well-documented code Guide system design and development by analysing information needs, system flows, data usage, and work processes, and translating these into practical implementation approaches. Own technical oversight … engineers and collaborate closely with architects and the test team to ensure new and modified software is fully verified prior to promotion. Breakdown the design into workable, and reportable, tasks for developers to incrementally deliver against in a Scrum/Agile fashion. Oversee and enable test automation within ...

Lead Software Engineer

Hiring Organisation
Hackajob Ltd
Location
Farnborough, Hampshire, South East, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£75,000
adherence to established code review standards Ensure defined quality gates are consistently met for the project Promote clean, maintainable, well-documented code Guide system design and development by analysing information needs, system flows, data usage, and work processes, and translating these into practical implementation approaches. Own technical oversight … engineers and collaborate closely with architects and the test team to ensure new and modified software is fully verified prior to promotion. Breakdown the design into workable, and reportable, tasks for developers to incrementally deliver against in a Scrum/Agile fashion. Oversee and enable test automation within ...

Full Stack Developer (.NET React)

Hiring Organisation
Tenth Revolution Group
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£300.00 - £350.00 per day
outside IR35 A retail company are hiring for a Senior Full Stack Engineer to join their order fulfilment team to help design, build and evolve the digital platform. This is a hands-on role where you'll work closely with product and engineering teams to solve real business problems … deliver impactful digital experiences. It is a modern engineering function that uses agentic AI tools throughout its development process. Responsibilities Design build and maintain scalable secure and high-performing ecommerce applications using React C# .NET and Azure Deliver end-to-end features across the stack from frontend experience through ...

Data Platform Architect

Hiring Organisation
ComplySci
Location
London, UK
Employment Type
Full-time
data products, the security master, semantic models, lakehouse technologies, APIs, event-driven services, AI interfaces, and analytics platforms. Establish architectural standards for interoperability, including API design, event contracts, data exchange patterns, versioning, and access controls. Define scalable integration patterns for customers, partners, and enterprise systems across API … technologies or knowledge graphs. Event streaming platforms. MCP or AI integration frameworks. Enterprise integration patterns. Financial services or RegTech experience. Identity and access management. API management platforms. To learn more about our values, mission and the wide-range of perks offered to employees at Comply, visit .Comply ...

Backend Engineer

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £80,000 per annum
including APIs, workflow engines, data services, and system integrations. Develop and support integrations between Java/Spring platform components and Python-based AI services. Design secure, reliable, and high-performance systems. Collaborate with cross-functional engineering teams to deliver robust backend solutions for demanding production environments. Implement and enhance … API architectures, observability frameworks, automated testing, and security best practices. Contribute to cloud infrastructure, CI/CD pipelines, and operational excellence across AWS-based environments. YOUR SKILLS AND EXPERIENCE : Strong commercial experience building backend applications. Strong Python experience is essential, with FastAPI as highly desirable Strong SQL and PostgreSQL ...

Finance AI Engineer (Consultant)

Hiring Organisation
Accenture
Location
Manchester, Greater Manchester, United Kingdom
Salary
£ 60 K
including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices.Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings, vector ...

Finance AI Engineer (Consultant)

Hiring Organisation
Accenture
Location
London, UK
Employment Type
Full-time
including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices. Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings ...

Finance AI Engineer ( Manager )

Hiring Organisation
Accenture
Location
Manchester, UK
Employment Type
Full-time
including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices. Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings ...

Finance AI Engineer ( Manager )

Hiring Organisation
Accenture
Location
London, UK
Employment Type
Full-time
including Python and at least one additional production language such as TypeScript or equivalent, version control, testing, CI, and maintainable code, together with SQL, API design, code review and secure coding practices. Hands-on LLM application development, covering tool use, structured outputs, retrieval and agent frameworks, including embeddings ...

Platform Lead - Data Availability, API & Integration

Hiring Organisation
Easyjet
Location
London, UK
Employment Type
Full-time
owning critical crew, flight planning, network control, and engineering systems like AIMS, TOPS, LIDO, and AMOS.We are seeking a visionary Platform Lead – Data Availability, API & Integration to join our platform leadership team. In this critical role, you will own the integration strategy and data availability capability end to end. … bespoke point-to-point interfaces. Source Data Availability: Ensure the absolute availability, timeliness, and integrity of operational data. Maintain the boundaries of production and API delivery while partnering smoothly with Enterprise Data on overarching governance. Operational Health & Resilience: Own the uptime, performance, and latency of the interface estate. ...

AI engineer with Agentic experience

Hiring Organisation
Luxoft
Location
London, UK
Employment Type
Full-time
basis with development team, designers, copy writers and other IT teams. The role develops and presents recommendations from analysis of current solution. Assist in design peer reviews, code peer reviews, build and unit test functional enhancements. Identify areas for code refactoring. Review and contribute to development process and procedures … Defends a recommendation and can confidently support it. Strong organization, communication, and interpersonal skills. Ability to communicate with business and technical audiences and produce design documents suitable for multiple audience types, both client-facing and internalMust be able to exhibit technical thought leadership and excellent problem solving ability, with ...

Senior Software Engineer

Hiring Organisation
ARC IT Recruitment
Location
Brighton, Sussex, United Kingdom
Employment Type
Permanent
Salary
GBP 70,000 Annual
platform. You'll build, measure and tune services running in the cloud and at the edge, and you'll own them from design through to production. You'll be part of a multi-disciplinary team of engineers, SDETs, DevOps, product and UX, releasing several times a day through … Server/T-SQL, including query tuning, indexing and execution plans High-traffic E-commerce or transactional systems Cloud experience, ideally AWS Strong RESTful API design: versioning, idempotency, caching, OpenAPI/Swagger Production ownership: monitoring and profiling .NET apps (eg Datadog, New Relic, CloudWatch) Daily ...

Senior Software Developer - Wise Platform

Hiring Organisation
Wise
Location
London, UK
Employment Type
Full-time
work: We're a small team that ships frequently and iterates on real partner feedback. Engineers own features from technical discovery and design through to production support. We work closely with our PM and designer to understand partner needs, and with adjacent teams (API Experience, Account Discovery … identity mapping between partner systems and Wise. The communication layer services between Wise and partners, extending them to handle new case types and workflows. API design for partner-facing endpoints. We care about consistency, documentation, and making them usable without hand-holding. Work with FinCrime, Compliance ...

Senior Product Security Engineer

Hiring Organisation
ARM
Location
Cambridge, Cambridgeshire, UK
Employment Type
Full-time
Python and comfortable in scripting (e.g. bash).Proven experience designing, building, and operating backend services or internal platforms in production environments. Strong understanding of API design, service-to-service integration, and backend architecture. Experience working in cloud environments, ideally AWS.Experience with containers and related tooling, for example Docker. ...

Lead Software Engineer

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent
workflows at scale. This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. Job Responsibilities Lead the design and delivery of user interface capabilities across Execute, from discovery to production support Set front-end technical direction, including architecture, standards, performance, and testing … time or data-intensive user experiences Demonstrated technical leadership in setting standards, leading designs, and mentoring teams Solid software engineering fundamentals, including OO/design patterns, debugging, and documentation Familiarity with agentic development approaches across the software development lifecycle Strong communication skills and ability to work effectively in global ...

Software Engineer, Core AI Services

Hiring Organisation
Aveva Group
Location
Cambridge, Cambridgeshire, United Kingdom
Salary
£ 60 K
time The job We are looking for a passionate Software Engineer to join our Core AI Services team. In this role, you will help design, develop, and scale AI-enabling platform services and public APIs that are secure, reliable, and cloud-native. These services will act as foundational building … across data pipelines, orchestration, and service APIs. Embed robust security controls to protect sensitive data and ensure secure access to AI services. Participate in design reviews, code reviews, and implementation discussions to ensure engineering excellence. Essential requirementsMinimum of 2 years professional experience in software engineering, preferably in platform ...

Principal Software Engineer - (.Net, Umbraco Or PHP, Drupal)

Hiring Organisation
TPXImpact Holdings Plc
Location
United Kingdom
Employment Type
Permanent
Salary
£75,000
across our client estate, spanning multiple platforms, hosting environments and codebases. Shape technical solutions for new business, from initial qualification through discovery to solution design and estimation. Lead the architecture of our largest and most complex client projects. Act as the senior technical escalation point for live incidents … client's budget, team and long-term maintenance capability, not to the most interesting technical solution available. You uphold a clear software design philosophy and ensure teams deliver maintainable solutions. You have a clear understanding of simplicity. You define solutions that are simple by design and challenge requirements ...

Senior Backend Developer (Java / Spring Boot / AWS)

Hiring Organisation
Sanderson Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £600 per day
Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential … skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design Reasonable Adjustments: Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people ...

Senior Backend Developer (Java / Spring Boot / AWS)

Hiring Organisation
Sanderson
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£500.00 - £600.00 per day
Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential … skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design Reasonable Adjustments: Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people ...

Senior Software Engineer

Hiring Organisation
ECM Selection (Holdings) Limited
Location
Cambridge, Cambridgeshire, United Kingdom
Employment Type
Permanent
company offers highly competitive remuneration, an excellent benefits package and work-life balance including hybrid work. The core requirements: • A senior software engineer’s design and coding ability and track record, judgement, mentoring and review skills. • Strong commercial-grade C# software development with awareness of modern .NET … language, and establish good patterns and factoring. • Microservice development experience – with good service factoring to reduce bloat, increase independence and separate concerns – and RESTful API design and development. • Strong communication skills to liaise with colleagues in other product teams. • A good technical degree from a top university, backed ...

Staff Software Engineer (Provenance)

Hiring Organisation
Cloudsmith
Location
Belfast, Down, United Kingdom
Salary
£ 60 K
modern CI/CD approach, deploying multiple times per day, and we support a global set of customers who are engineers like us.Key ResponsibilitiesBuild: Design, implement, and ship the provenance ingestion service — capable of accepting provenance and attestation payloads from CI/CD systems, public registries, signed bundles … Experience designing pipelines that handle varied, schema-evolving, high-volume payloads reliably and at scale — including robust error handling and observability.Data Modelling: Ability to design storage schemas that efficiently represent signed metadata envelopes, artefact graphs, and queryable relationships. API Design: Experience building and versioning APIs consumed ...

Technical Lead

Hiring Organisation
Vanguard
Location
Manchester, UK
Employment Type
Full-time
Responsibilities Technical Leadership Provide expert-level technical direction for the public UKPI web estate — Angular front-ends, Node.js services, and AEM-authored content. Lead design, development, and implementation across the monorepo's apps and shared libraries. Solution Architecture & Governance Define and enforce architectural standards (module boundaries, shared-library design … enhancements. What it takesKey Skills Experience with JavaScript/TypeScript, Angular, HTML, CSS, and modern Node.js; working knowledge of Java. Familiarity with microservice architecture, API design, and integration patterns. Knowledge of AWS services and cloud-based deployment (ECS, CloudFront, CDN/edge concepts). Strong understanding ...

Senior React & Node Developer (AI & Full Stack)

Hiring Organisation
INFUSED SOLUTIONS LIMITED
Location
London, United Kingdom
Employment Type
Permanent
Salary
£75,000
part of a small, highly experienced engineering team responsible for transforming ambitious ideas into production-ready software. Working closely with Product, Design and AI specialists, you'll take concepts from whiteboard sketches through to prototypes, proof of concepts, MVPs and ultimately scalable products. If you enjoy solving complex problems … frontend development, backend engineering and cloud technologies to rapidly build and validate new AI-powered products. You'll be heavily involved in architecture, technical design and proof-of-concept development, collaborating directly with stakeholders to transform ideas into working software. This is a hands-on engineering role where ...