1 to 25 of 94 API Design Jobs in London

Lytham, Durham or Glasgow . We are seeking an experienced Integration Architect to support a major Core Banking Transformation programme, with a focus on API and integration architecture across complex systems. This role combines hands on design input with architecture governance, including reviewing, validating and signing off integration … designs, while also working closely with product teams and suppliers to shape API strategy, drive consistency and ensure alignment with enterprise standards and regulatory requirements. The architect will act as a key coordination point across Architecture, Development and Testing teams, as well as multiple delivery partners within a fast ...

work on impactful features that directly shape our platform and make a real difference to our customers. What you’ll do Design, build, and ship reliable backend services and APIs in Python (Flask) that power core product functionality. Own features end-to-end: data modelling (Postgres), API design … auditability, ledger concepts). Experience with distributed systems patterns (queues, background jobs, retries, rate limiting). Security experience (threat modelling, OWASP-style concerns, secure API design). Familiarity with Terraform. Why join us? £60k salary + equity 40 days holiday (incl. bank holidays) Pension scheme (3% employer contribution ...

work on impactful features that directly shape our platform and make a real difference to our customers. What you’ll do Design, build, and ship reliable backend services and APIs in Python (Flask) that power core product functionality. Own features end-to-end: data modelling (Postgres), API design … auditability, ledger concepts). Experience with distributed systems patterns (queues, background jobs, retries, rate limiting). Security experience (threat modelling, OWASP-style concerns, secure API design). Familiarity with Terraform. Why join us? £60k salary + equity 40 days holiday (incl. bank holidays) Pension scheme (3% employer contribution ...

Senior Backend Engineer to join our London-based engineering team. This is a hands-on, high-impact role where you will help design and build the core services, APIs, and integrations that power our security platform, working closely with a globally distributed team. You will work closely with product … collaborative engineering environment. This role is hybrid in our office in Blackfriars London. About SecurityHQ SecurityHQ is a global cybersecurity company. Our specialist teams design, engineer and manage solutions that do three things: Promote clarity and trust in a complex world. Build momentum around improving security posture. And increase ...

Terra — from upstream data suppliers (wearables, health apps, sensors) into our unified schema, and out to downstream developers and AI consumers via our REST API, Streaming API, and webhooks. This is not a maintenance role. You will build new data connectors, scale real-time streaming pipelines, harden … authentication layer, and design the systems that handle millions of API calls per day. You will work across the entire stack — from low-level data ingestion to developer-facing API surfaces. You will ship fast, iterate through feedback loops, and think in first principles. ...

Domain Location: London, United Kingdom (Hybrid) Employment Type: Permanent Summary of the role We are seeking an experienced AI Solution Architect to lead the design and delivery of enterprise-scale agentic AI platforms and GenAI-enabled solutions. This role will define end-to-end architecture across AI, data, orchestration … into practical enterprise solutions. Architecture & Technical Leadership Define end-to-end architecture for agentic AI-enabled platform across data, AI, orchestration, and integration layers Design and govern agentic orchestration framework for multi-step workflows Establish architecture patterns for - RAG and grounding, Vector search and retrieval, MCP tool access layer ...

metrics framework to track performance and guide prioritisation. Discovery & Delivery Lead end‐to‐end product development: from problem discovery and requirements definition through to API and data model design, launch, and iteration. Work closely with engineering counterparts to design foundational services and APIs that are clean, scalable … confidence. About You Experience Product management experience with a track record of owning complex, infrastructure‐level or platform products end‐to‐end. Experience with API design and data architecture – you care deeply about modelling real‐world complexity cleanly and building systems other teams can depend on. Comfortable operating ...

work on impactful features that directly shape our platform and make a real difference to our customers. What you’ll do Design, build, and ship reliable backend services and APIs in Python (Flask) that power core product functionality. Own features end-to-end: data modelling (Postgres), API design … auditability, ledger concepts). Experience with distributed systems patterns (queues, background jobs, retries, rate limiting). Security experience (threat modelling, OWASP-style concerns, secure API design). Familiarity with Terraform. Our stack Backend: Python, Flask Data: Postgres Cloud: AWS Edge: Cloudflare Infrastructure as Code: Terraform Delivery: CI/ ...

work on impactful features that directly shape our platform and make a real difference to our customers. What you’ll do Design, build, and ship reliable backend services and APIs in Python (Flask) that power core product functionality. Own features end-to-end: data modelling (Postgres), API design … auditability, ledger concepts). Experience with distributed systems patterns (queues, background jobs, retries, rate limiting). Security experience (threat modelling, OWASP-style concerns, secure API design). Familiarity with Terraform. Our stack Backend: Python, Flask Data: Postgres Cloud: AWS Edge: Cloudflare Infrastructure as Code: Terraform Delivery: CI/ ...

love to come to work, every single day. Come join our team! This is a hybrid position Responsibilities The Expert Software Architect leads the design of complex, high-impact software systems, creating scalable, secure architectures that align with business strategy and technology roadmaps. This role shapes architectural decisions across … cloud modernisation, AI enablement, and cost‐of‐ownership optimisation. The Expert Software Architect translates business strategy into actionable architectural frameworks, guiding teams through complex design decisions and trade‐offs across performance, security, scalability, maintainability, and compliance. Architecture Leadership Lead the design of scalable, high-performing architectures across complex ...

real scope to shape how the engineering team operates. Responsibilities as a Tech Lead: Own technical direction across the backend monolith, covering architecture decisions, API design, system reliability, and background job performance Drive end-to-end delivery, from scoping and estimation through to execution, managing trade-offs between … professional Ruby on Rails experience in production, with a solid grasp of monolith architecture and full-stack troubleshooting Experience with PostgreSQL, Redis and RESTful API design Comfortable with AWS-based infrastructure and Docker in development or production environments Proven ability to act as a genuine escalation point, with ...

come to work, every single day. Come join our team! This is an office-based position. Responsibilities The Expert Software Architect leads the design of complex, high-impact software systems, creating scalable, secure architectures that align with business strategy and technology roadmaps. This role shapes architectural decisions across multiple … cloud modernisation, AI enablement, and cost‐of‐ownership optimisation. The Expert Software Architect translates business strategy into actionable architectural frameworks, guiding teams through complex design decisions and trade‐offs across performance, security, scalability, maintainability, and compliance. Architecture Leadership Lead the design of scalable, high-performing architectures across complex ...

business-critical integration platform. Partner with senior technology stakeholders to ensure alignment with enterprise architecture principles and future technology strategy. Define architecture standards, design patterns, and engineering best practices. Provide hands-on technical leadership while remaining actively involved in solution design and development. Design secure, scalable, event … large-scale enterprise environments. Strong software engineering background with C# and .NET Core. Experience designing and implementing microservices architectures. Strong understanding of Domain-Driven Design (DDD). Expertise in API design, security, governance, and API Management technologies. Experience with messaging technologies such as RabbitMQ, Kafka ...

senior individual contributor who combines hands‐on Java development with architectural leadership, remaining close to implementation and setting the technical standard through design, code‐level guidance, and practical problem solving. Design, build, and evolve highly available, high‐throughput, zero‐downtime systems and internet‐facing APIs that can scale … securely for large retail and external client volumes. Lead architectural decisions across API design, domain modelling, integration patterns, resilience, observability, and operational robustness, ensuring the platform is fit for 24/7 global production use. Work across multiple software engineering teams to drive consistency in engineering standards, development ...

scale. EY has been selected for the inaugural Frontier Firm AI Initiative — a collaboration between Microsoft and Harvard’s Digital Data Design Institute — recognising EY’s leadership in shaping enterprise-grade human–AI operating models. In parallel, EY is expanding its collaboration with OpenAI and Microsoft, bringing advanced … adoption. However, many struggle to translate ideas into secure, scalable and reliable production solutions. As a Forward Deployed Engineer, you will contribute to the design and delivery of AI-enabled systems that operate reliably in enterprise environments. Working within a delivery squad, you will take ownership of defined engineering ...

Full Stack Engineer with a strong back‐end focus to join one of our Profile domain product teams. This role is full stack by design: you will work across back‐end and front‐end codebases, contributing to end‐to‐end product delivery. However, your primary strength will … front end. You will join an established, autonomous product team owning their product end‐to‐end, with real ownership over technical design, implementation, and continuous improvement. Your responsibilities Design, build and evolve scalable back-end services using C# and .NET Core, alongside developing front-end features with modern ...

Full Stack Engineer with a strong back-end focus to join one of our Profile domain product teams. This role is full stack by design: you will work across back-end and front-end codebases, contributing to end-to-end product delivery. However, your primary strength will … front end. You will join an established, autonomous product team owning their product end-to-end, with real ownership over technical design, implementation, and continuous improvement. Your responsibilities Design, build and evolve scalable back-end services using C# and .NET Core, alongside developing front-end features with modern ...

Python (pyspark): Experience with data pipelines and analytics is a plus. Power BI: Familiarity with developing dashboards and data models. Architecture: Knowledge of microservices, API design, and event-driven architectures. DevOps/CI/CD: Experience with Azure DevOps, GitLab, GitHub Actions, or similar tools. Cloud Platforms: Proficient … Azure preferred). Databases: Strong skills in SQL Server, PostgreSQL, or other relational databases. containerisation: Experience with Docker and Kubernetes. Key Responsibilities Design & Develop: Create and maintain full stack applications using React JS and C#.NET Core. Build Services: Develop high-performance backend services and RESTful APIs with a focus ...

venture backed by the strength and stability of an established business. Key Responsibilities End-to-end development of high-quality, scalable SaaS platforms from design through deployment and maintenance. Architect and implement robust backend services primarily using Python and PostgreSQL. Develop and maintain responsive, performant front-end applications with … Provide technical mentorship and leadership to development teams, fostering best practices in coding, testing, and deployment. Participate in code reviews, architecture discussions, and system design decisions. Troubleshoot and resolve complex technical issues across the full stack. Ensure software security, scalability, and performance are maintained at all times. Keep abreast ...

looking for an experienced Senior Java Developer to join a high-performing engineering team. You will take a lead role in the design and delivery of complex, enterprise-scale solutions, bringing strong Java, AWS, and API expertise to a programme that is making a real difference to patient … care across the country. KEY RESPONSIBILITIES Lead the design and development of robust, scalable Java-based applications across the programme Build and maintain cloud-native solutions on AWS, applying well-architected principles throughout Design, develop, and test REST APIs to a high standard, ensuring performance, reliability, and security ...

PostgreSQL, complex data modelling AI/ML : OpenAI integration, semantic search, conversational agents, unstructured data analysis and extraction Infrastructure : AWS (Lambda, ECS/EKS, API Gateway, S3) DevOps : Terraform, GitHub Actions, Helm, Infrastructure-as-Code Data Science : Graph analytics, data pipelines, ETL workflows, Jupyter notebooks Required Qualifications Software Development … understanding of async programming Experience with Poetry or similar Python dependency management tools Experience building RESTful APIs and micro-services Solid understanding of database design and optimisation (both SQL and NoSQL) Experience with graph databases (Neo4j preferred) or willingness to learn quickly Knowledge of event-driven architectures and message ...

high-performing cloud practice. This is an opportunity to work at the forefront of cloud transformation, partnering with tier-one clients across industries to design and deliver innovative, scalable, and secure AWS solutions. You'll play a pivotal role in shaping enterprise cloud strategies while leading complex transformation programmes. … strategy Certifications & Education AWS Certification (Associate or Professional - e.g. Solutions Architect, DevOps Engineer) Degree in Computer Science, Engineering, or related discipline Technical Expertise Architecture & Design Translating business needs into scalable cloud architectures Cost optimisation and cloud best practices Data & AI Experience with data platforms, analytics, and AI/ ...

PostgreSQL, complex data modelling AI/ML : OpenAI integration, semantic search, conversational agents, unstructured data analysis and extraction Infrastructure : AWS (Lambda, ECS/EKS, API Gateway, S3) DevOps : Terraform, GitHub Actions, Helm, Infrastructure-as-Code Data Science : Graph analytics, data pipelines, ETL workflows, Jupyter notebooks Required Qualifications Software Development … understanding of async programming Experience with Poetry or similar Python dependency management tools Experience building RESTful APIs and micro-services Solid understanding of database design and optimisation (both SQL and NoSQL) Experience with graph databases (Neo4j preferred) or willingness to learn quickly Knowledge of event-driven architectures and message ...

embedded delivery team supporting client's technology and product teams as a senior technical lead within an agile environment. What You'll Do Design, build, and maintain scalable, production-grade software across web, API, and data layers Own technical delivery end-to-end from requirements gathering through … stack Strong proficiency in at least two languages (e.g. Python, TypeScript, C#, Node.js), with confidence picking up others as needed Solid grounding in RESTful API design, microservices architecture, and cloud-native development (Azure preferred) Proven experience with CI/CD pipelines, (Docker/Kubernetes), and DevOps practices Strong ...

Spring Boot background to support customer-specific delivery workstreams and wider digital transformation projects. The role requires hands-on architecture experience across modern service design, integration, cloud-hosted platforms and delivery governance. The successful candidate will help shape robust, maintainable and scalable services, working closely with engineering teams, delivery … Boot services and supporting platform components. Produce high-quality architecture artefacts including HLDs, LLDs, roadmaps, integration patterns, sequence diagrams and data models. Lead technical design governance, ensuring alignment with enterprise architecture principles, GDS Service Standard and delivery best practice. Provide technical assurance across delivery teams, suppliers and stakeholders. ...