22 of 22 API Design Jobs in the South East

Technical Architect

Location
Milton Keynes, England, United Kingdom
Role Overview We are looking for an experienced Technical Architect with strong expertise in the Banking and Financial Services domain to lead the design and implementation of enterprise-grade technology solutions. The ideal candidate will possess deep technical expertise across application architecture, cloud technologies, integration platforms, and banking systems … while ensuring solutions align with business and regulatory requirements. Key Responsibilities Architecture & Solution Design Define and govern application architecture standards, frameworks, and best practices. Design scalable, secure, resilient, and high-performance banking applications. Create High-Level Design (HLD) and Low-Level Design (LLD) documents. Drive modernization ...

Senior Platform Engineer

Location
Reigate, England, United Kingdom
technical input, guidance and leadership to the team (including code quality, best practices, processes, some aspects of release management, etc.). Assist in the design and documenting of solutions meeting functional and non-functional requirements. Lead by example getting directly involved in the day-to-day delivery of work … bring Platform and controlplane engineering Practical experience designing and developing management and controlplane capabilities for lineofbusiness or SaaS applications, including stack/environment management, API design for platform services, and developer/operator UX. Experience working with or designing Azure stamp-based or scale‐unit architectures, including multi ...

Software Architect (UK)

Location
Horsham, England, United Kingdom
negotiable depending on experience) Responsibilities and Duties The Software Architect role requires a professional who combines deep technical expertise with strategic vision to design and guide the implementation of scalable, maintainable software systems. They will be responsible for defining architectural standards, evaluating technology choices, and ensuring development teams have … software development Strong expertise in .NET development, C#, and Visual Studio Experience developing .NET based web services and distributed systems Demonstrated ability to design and implement scalable, maintainable software architectures Experience with architectural patterns (microservices, event‐driven, layered architecture, etc.) Strong understanding of software design principles (SOLID ...

Lead Software Developer

Location
Leatherhead, England, United Kingdom
sustainability PURPOSE OF JOB: We are looking for a proactive, product-minded C# Developer to join our small, agile engineering team. The role will design, build and support secure, scalable applications across the full technology stack, with a strong focus on clean architecture, test-driven development and reliable delivery. … hats, learning new technologies and collaborating closely with product managers, designers and engineers to deliver user-centred solutions and drive technical excellence. KEY RESPONSIBILITIES: Design & Develop: Build and maintain backend services in C# using .NET Core/.NET 9, with a focus on clean architecture, scalability and maintainability. Full ...

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 ...

Staff Software Engineer - Lead Builder for Scalable AI

Location
Witney, England, United Kingdom
team, we achieve goals together that would be impossible alone. Skills Required Technical skills: Proficiency with Node, Typescript, and Python. Good understanding of system design concepts - distributed systems, reliability/performance tradeoffs Experience in API design, implementation, and documentation Experience using AI coding tools (Cursor, Github Copilot ...

Staff Software Engineer

Location
Witney, England, United Kingdom
Skills Required Technical skills Proficiency with Node, Typescript, and Python. Good understanding of system design concepts such as distributed systems, reliability/performance tradeoffs. Experience in API design, implementation, and documentation. Experience using AI coding tools (Cursor, Github Copilot, Claude, etc). Experience working with CI/ ...

Experienced .NET Engineer

Location
Maidstone, England, United Kingdom
change where relevant. Offer technical assistance and support across the company. Liaise with third‐party software providers throughout the lifecycle of projects, from design and development to support and maintenance. Required Skills & Experience Proven leadership skills with the ability to support, guide, and delegate effectively. Strong communication and interpersonal … ability to adapt and fix legacy code. Experience planning, coordinating, and delivering testable software in scaled Agile environments. Solid knowledge of software structures, architectures, design patterns, and modern development processes. Minimum 5 years’ experience in C# development. Hands‐on expertise in the following: .NET Core 3.1 ASP.NET MVC (Core ...

Senior Software Engineer, System Orchestration

Location
Oxford, England, United Kingdom
onto it safely, contributing directly to the success of the System Software function. Key responsibilities include: Own a service or subsystem end to end - API design, implementation, rollout and ongoing operational health. Build closed-loop behaviour that acts on measured system state without a person in the loop. … Design state machines and their persistence together, so that what survives a restart is a decision rather than an accident. Make our services behave correctly under concurrency and partial failure.Move live systems onto new behaviour without losing data or interrupting work in flight. Evolve our APIs, and bring ...

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

Location
Brighton, England, United Kingdom
indexing data for searching. Skills required: At least 8 years’ experience in C# .Net, SQL Knowledge of some queue brokering technology, e.g., RabbitMQ API design experience (preferably .NET 10.0 Web API)/REST-based web services Orleans and Event Store .Net Core Elastic Search (with Kibana dashboards ...

Senior AI Engineer

Hiring Organisation
RWS
Location
Royal Borough of Windsor and Maidenhead, United Kingdom
Employment Type
Full Time
Service Operations, Data & Analytics, Security & Quality Compliance, Transformation, Application Development, and Enterprise Platforms. Job Overview Key Responsibilities Architecture and technical strategy Contribute to the design and architecture of core platform components and evaluation systems, making the load-bearing technical decisions and bearing accountability for their reliability, scalability, and long … capabilities are built, evaluated, and deployed across the company, and define a coherent platform vision that scales beyond your immediate team. Design reusable abstractions, SDKs, and services for model integration, prompt management, experimentation, and deployment that establish organization-wide patterns and reduce duplicated effort. Research and delivery excellence Help ...

Senior Full Stack Engineer

Hiring Organisation
Dignity Funerals Limited
Location
Maidenhead, Berkshire, South East, United Kingdom
Employment Type
Permanent
Salary
£90,000
will bring expertise in full stack development using JavaScript or TypeScript, Node.js, and React or Angular , together with strong knowledge of systems architecture, API design and databases. You will also understand the importance of observability, monitoring, testing, performance, security, accessibility and modern DevOps practices. You are comfortable working ...

Senior Software Engineer, Non-Realtime Controllers

Location
Oxford, England, United Kingdom
with support for the teams and scientists who depend on them. Key responsibilities include: Own a group of device controllers end to end, covering API design, implementation, rollout and ongoing operational health. Make services robust against the ways real instruments fail. Bring devices onto our current framework ...

Staff Engineer Decision Support & Planning Optimization

Location
Bracknell, England, United Kingdom
apply deep expertise in Python or Java backend engineering to deliver durable, scalable outcomes. Lead and apply deep expertise in software architecture and API design to deliver durable, scalable outcomes. Lead and apply deep expertise in document ingestion and retrieval patterns to deliver durable, scalable outcomes. Lead … Angular awareness to deliver durable, scalable outcomes. Mentor and guide junior and mid-level engineers, fostering a culture of technical excellence and continuous learning. Design and implement comprehensive testing strategies, including unit tests, integration tests, and end-to-end validation for knowledge management systems. Establish and enforce security best ...

Senior iOS Engineer

Location
Havant, England, United Kingdom
product that blends artificial intelligence, aviation expertise, and seamless mobile user experience while partnering closely with our in-house designers. You'll turn complex design concepts into seamless, shippable code and help steer the future of our digital flight tools. What You’ll Do: Develop scalable, high-performance features … other core Apple frameworks (specifically MapKit or similar mapping SDKs) Experience integrating REST APIs, with enough backend understanding to troubleshoot issues and contribute to API design Strong understanding of iOS build systems, provisioning, certificates, and App Store requirements Strong proficiency in Git Bonus Qualifications: Bachelor’s degree ...

Senior .NET Core Developer - Hybrid Role in Brighton

Location
Brighton, England, United Kingdom
C#, SQL, and modern architectures, migrating to .NET Core, with Azure DevOps for CI/CD and Elastic Stack for logging and analytics. Strong API design, event sourcing concepts, and experience with RabbitMQ are essential. #J-18808-Ljbffr ...

Staff Embedded Software Engineer

Location
Milton Keynes, England, United Kingdom
systems. As a Cesium software team member, you will be responsible for software designs from concept through production, including product roadmaps, block diagrams, detailed design and coding, analysis, test, qualification, and in-orbit support. The ideal candidate will have development experience at nearly every level of the software stack … experience in software testing and high-reliability qualification, as well as software engineering and software project management practices. The successful candidate will present engineering design review materials to our customers and executive team, as well as participate in proposal-writing efforts. As such, excellent written and verbal communication skills ...

Software Engineer, Non-Realtime Controllers

Location
Oxford, England, United Kingdom
across our fleet, contributing directly to the success of building utility‐scale quantum computers. Own a group of device controllers end to end, covering API design, implementation, rollout and ongoing operational health Make services robust against the ways real instruments fail and strengthen observability, health checking and alerting ...

Process Orchestration Architect

Hiring Organisation
Capgemini
Location
Oxfordshire, United Kingdom
Employment Type
Full Time
contact the recruiter directly. Your role We are seeking an experienced Process Orchestration Architect with deep expertise in Camunda and Pega to lead the design and implementation of enterprise-scale process orchestration solutions. The ideal candidate will be responsible for architecting intelligent, intent-driven workflows, enabling automation across business … domains, and driving the adoption of modern orchestration frameworks aligned with TM Forum standards. This role requires a blend of solution architecture, process optimization, API design, technical leadership, and Agile delivery experience. Your profile 10+ years of experience in enterprise solution architecture, process automation, or workflow orchestration. 5+ ...

Full-Stack Rails/React Developer – Impact Education

Location
Farnborough, England, United Kingdom
clean, scalable code that supports thousands of users. You’ll collaborate with product and education teams in a hybrid Farnborough setting, contribute to API design with GraphQL and REST, and help improve performance and test coverage. #J-18808-Ljbffr ...

AI Engineer Python

Location
Bracknell, England, United Kingdom
level Software Engineer with deep Python expertise to build reliable internal platforms and developer-enablement capabilities. This is an engineering-first role: strong software design, coding fluency and practical problem-solving are essential. You will apply AI in pragmatic ways-such as designing document search and conversational experiences using … Retrieval-Augmented Generation (RAG)-while maintaining a high bar for engineering quality, security, scalability and operational excellence. What You’ll Do Design, build and maintain production-grade Python services, libraries and developer tools. Apply modern Python practices, including packaging, type hints, asynchronous programming and maintainable API design. Create ...