26 to 50 of 301 API Design Jobs in London

Senior Software Engineer

Hiring Organisation
The Portfolio Group
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£90000/annum
integration layer behind a new generation of AI-powered products. This is a genuinely full-stack engineering role, combining production-grade backend development, API design, AI integrations and frontend engineering. You'll work across the full application lifecycle, designing the services and interfaces that connect AI capabilities … products customers and colleagues use every day. You'll play a key role in building MCP integrations, agent-to-agent connectivity and robust API services, while also developing responsive, accessible interfaces in React and TypeScript. What you'll be doing Own the application and integration layer of AI products ...

Senior Software Engineer

Hiring Organisation
The Portfolio Group
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£90,000 per annum
integration layer behind a new generation of AI-powered products. This is a genuinely full-stack engineering role, combining production-grade backend development, API design, AI integrations and frontend engineering. You'll work across the full application lifecycle, designing the services and interfaces that connect AI capabilities … products customers and colleagues use every day. You'll play a key role in building MCP integrations, agent-to-agent connectivity and robust API services, while also developing responsive, accessible interfaces in React and TypeScript. What you'll be doing Own the application and integration layer of AI products ...

Technical Solution Architect

Hiring Organisation
Fruition Group
Location
London, United Kingdom
Employment Type
Permanent
architecture of a ledger-based post-trade platform. You'll start hands-on as a senior engineer, and take on increasing ownership of system design, technical direction, and solution architecture as you grow into the role. Why This Role You'll have real influence in a small, high-calibre … genuine voice in product and architectural decisions. Expect a fast learning curve across technology, regulation, and market structure. What You'll Do Architecture & System Design Design secure, scalable distributed systems for regulated environments Define and evolve system architecture, APIs, and integration patterns Apply sound software design patterns ...

Kong API Management

Hiring Organisation
E-Solutions IT Services UK Ltd
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£400.00 - £450.00 per day
Kong API Management/API Engineer London - 5 days/week onsite Required qualifications, capabilities, and skills · Programming languages: Advanced proficiency in one or more programming languages - Golang or Lua Script. · Cloud-native operations: Practical, hands-on cloud-native experience. · API management: Professional experience with API … management technologies (e.g., Apigee, Kong, or MuleSoft). · API design: Strong understanding of the OpenAPI Specification (OAS) for RESTful APIs. · API security: Hands-on experience securing APIs at the gateway, including OAuth 2.0, OpenID Connect (OIDC), JWT validation, key-auth, and mutual TLS (mTLS). · DevOps toolchain ...

Customer Engagement Manager

Location
Greater London, England, United Kingdom
organizational readiness—not just technical implementation Translate business objectives into implementation strategies and communicate technical constraints in business language executives understand Technical Solution Design & Architecture Guidance Lead or co‐lead design workshops with customer technical teams to architect end‐to‐end solutions: integration flows, data migration strategies, workflow … design Design integrations between Rocketlane and enterprise systems (NetSuite, Salesforce, Workday, SAP, HRMS, CRMs, data warehouses) Evaluate integration approaches and make build‐vs‐buy recommendations: native connectors, iPaaS platforms (Workato, Boomi), custom API development Review and validate solution designs created by Solution Architects; push back when designs ...

Software Engineer III, Android, Jetpack Compose

Location
Greater London, England, United Kingdom
Master's degree or PhD in Computer Science or a related technical field. 2 years of experience with data structures and algorithms. Experience with API Design, Android Libraries, Declarative Programming and API Development. Previous knowledge of Jetpack Compose. Familiarity with Android as a platform and have … well beyond web search. We're looking for engineers who bring fresh ideas from all areas, including information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and mobile; the list goes on and is growing every day. ...

Customer Engagement Manager

Location
Greater London, England, United Kingdom
organizational readiness-not-just technical implementation Translate business objectives into implementation strategies and communicate technical constraints in business language executives understand Technical Solution Design & Architecture Guidance Lead or co-lead design workshops with customer technical teams to architect end-to-end solutions: integration flows, data migration strategies, workflow … design Design integrations between Rocketlane and enterprise systems (NetSuite, Salesforce, Workday, SAP, HRMS, CRMs, data warehouses) Evaluate integration approaches and make build-vs-buy recommendations: native connectors, iPaaS platforms (Workato, Boomi), custom API development Review and validate solution designs created by Solution Architects; push back when designs ...

Software Development Engineer III

Location
Greater London, England, United Kingdom
play a pivotal role in shaping our technical domain to power all Expedia Group’s brands and product lines. In this role, you will: Design and implement scalable, robust, and maintainable systems and services across multiple domains, with a focus on reliability and performance. Develop complex application logic, APIs … years of relevant professional experience. Strong software engineering fundamentals—data structures, and algorithms in Java or Kotlin, with familiarity across the JVM stack, system design, and distributed systems, and can understand highly complex systems, design moderately complex services, and guide integrations across teams within the business unit. Building ...

Manager - AI Tech Transformation - TC - FS

Location
Greater London, England, United Kingdom
help to build a better working world. The opportunity We are seeking a Manager, AI Architect specializing in generative AI to lead the design and delivery of GenAI solutions for our clients. This is a hands‐on delivery and technical management role: you will own the architecture … your solutions run reliably in production. You will work closely with client teams and communicate technical decisions clearly to project stakeholders. Your key responsibilities Design and Delivery of Engagements Own the architecture and technical delivery of a GenAI solution area or workstream, from design through production rollout. Lead ...

Technical & Solution Architect (Distributed Ledger / Regulated Financial Services)

Location
Greater London, England, United Kingdom
hands-on technical leadership position in the making. You will work across product management, engineering, and client-facing discussions to document and evolve the design of a distributed ledger-based post-trade platform operating within regulated financial services. You will initially contribute as our technical documentation lead while progressively … taking ownership of system-level architecture, solution design, and technical direction. This role is ideal for someone who wants to: Move from senior technical writer or senior engineer to architect; Work on real financial market infrastructure problems; Combine deep technical thinking with business context; Shape a product ...

Product Manager – Global Card Issuing Platform (BaaS)

Location
Greater London, England, United Kingdom
infrastructure that allows clients to launch card programs anywhere in the world through a single integration. You will be responsible for a unified Global API and SDK suite that abstracts the complexity of regional payment networks. Whether a client is launching in Europe, North America, or APAC, your product … will provide a consistent, white-label experience. You will drive both the technical \"how\" (API/SDK design) and the strategic \"where\" (global expansion and regional issuing setups). What you’ll do Unified Global API Strategy: Design and maintain a single, polymorphic API architecture ...

Senior Software Development Engineer

Location
Greater London, England, United Kingdom
with a growth mindset. We value our team culture and work together from the office three times a week. In this role, you will: Design, build, and maintain robust full stack applications and scalable services across multiple domains, applying deep technical expertise and architectural skills. Lead … development process, including system design, API design, and data modelling, ensuring quality and maintainability of solutions. Collaborate across engineering, product, and business teams to define requirements, deliver impactful features, and drive technology strategy. Mentor and guide engineers, fostering best practices in coding, testing, and operational excellence within ...

Software Development Engineer II

Location
Greater London, England, United Kingdom
Expedia Group brands power global travel for everyone, everywhere. We design cutting-edge tech to make travel smoother and more memorable, and we create groundbreaking solutions for our partners. Our diverse, vibrant, and welcoming community is essential in driving our success. Why Join Us? To shape the future … great experience to delight our customers. Our goal is to enhance every traveler's experience and make it better! In this role, you will: Design, develop, and maintain high-throughput, low-latency distributed backend services that deliver efficient, optimal pricing solutions at scale. Implement robust caching mechanisms to enhance ...

Software Engineer - Core Networking

Location
Greater London, England, United Kingdom
part of influencing the strategic direction for connectivity with Neo4j and the drivers together with our product managers. You will be leading the design of new features and improvements to the protocol whilst taking on feedback from other experts and stakeholders within the company. You will then implement these … interest in: Network development (binary protocol specs like Bolt , Frontend/Backend , MongoDB Wire Protocol ) Network packet analysis (e.g., Wireshark) Distributed system design API design Netty Customer experience and developer community interaction Concurrency and asynchronous programming You may have also worked with some of: Database management systems ...

Senior Android Engineer - Jetpack Compose & API Design

Location
Greater London, England, United Kingdom
This mid-level role requires hands-on experience with Android apps, Kotlin, and collaboration across multiple surfaces and teams. The engineer will contribute to API design and developer tooling while advancing Google’s Android platform initiatives. The position emphasizes in-person interviews and opportunities to mentor junior teammates ...

backend developer for developer documentation

Location
Greater London, England, United Kingdom
code reviews, pair programming, and architecture discussions; Collaborate cross-functionally with other Apple teams to integrate tools and systems seamlessly; Write detailed architecture and design proposals; Identify areas for continuous improvement; Mentor other engineers; Contribute to architecture discussions, code reviews, and proposals. Требования Experience shipping high-quality, performant … reliable web applications; Passion for developing products and features; Ability to discuss technical trade-offs across system architecture, database design, API design, and infrastructure; Continuous learning attitude focused on improving personal and team capabilities; Nice to have: BS/MS in Computer Science, Computer Engineering, Informatics ...

Full Stack Engineer

Location
Greater London, England, United Kingdom
work alongside architects, product stakeholders and delivery partners to ship software that brokers and analysts use every day.**Key Responsibilities:*** **Build Across the Stack:** Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces.* **Cloud Native Delivery:** Develop and run cloud … usable, performant ways for brokers and analysts.* **AI-Enabled Development:** Build AI-enabled product features using patterns such as retrieval-augmented generation, tool and API integration, evaluation and human-in-the-loop design.* **AI-Assisted Engineering:** Use AI-assisted engineering tools such as Claude Code or Claude Cowork ...

Senior Solutions Consultant

Location
Greater London, England, United Kingdom
with Account Executives, Customer Success Managers, and Service Delivery to solve complex identity challenges for enterprise customers, leading efforts from the discovery and solution design through to evaluation for prospects and existing customers. You’ll translate technical and business requirements into scalable solutions, lead technical engagements, and ensure customers … Advise on best practices across identity, compliance, fraud, risk and integrations, adapting your approach to different customer contexts and levels of technical depth Strong API expertise (REST, API design, OAuth, API keys, JSON/XML) with the ability to translate complexity into clear, actionable solutions Comfortable ...

BTP Integration Architect (SAP)

Hiring Organisation
Vbeyond
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
Competitive salary
govern the end-to-end integration strategy for the S/4HANA Bluefield migration, ensuring alignment with enterprise architecture principles. Architect BTP Solutions: Design and architect robust integration scenarios using the full suite of SAP BTP services, with a heavy focus on SAP Integration Suite (Cloud Integration/… API Management, and Event Mesh. Govern Technical Design: Lead design authority sessions to review and approve all integration patterns, ensuring they are standard, reusable, and fit for purpose. Bluefield Migration Expertise: Provide expert guidance on the unique integration challenges of a Bluefield (system conversion) migration, including ...

Mid-Level Full-Stack Software Engineer

Location
Greater London, England, United Kingdom
Full-Stack Software Engineer with strong experience in C#/.NET Core and modern front-end technologies (React, JavaScript/TypeScript, HTML, CSS) to design, develop, and maintain robust APIs and user interfaces for our enterprise applications. The ideal candidate will be passionate about clean code, scalable architecture … high quality products. Exposure to modern AI tools and services (such as GitHub Copilot or APIs from providers like Anthropic) is beneficial. You Will: Design, develop, and maintain RESTful APIs using .NET Core. Work with data from SQL (MS-SQL server) and NoSQL (MongoDb) databases and external APIs. Ensure ...

Enterprise Software Architect

Location
Bromley, England, United Kingdom
enterprise and partner ecosystems. The position also plays a key role in shaping industry best practices and representing the organisation externally. Enterprise & Ecosystem Architecture Design and oversee the implementation of enterprise‐wide software architecture, spanning internal platforms, cloud environments, and external partner ecosystems Develop “big picture” architectural frameworks … adherence to security, compliance, regulatory, and quality standards Identify and mitigate long‐term architectural risks (e.g., vendor lock‐in, scalability constraints, regulatory exposure) Technical Design & Solution Development Conduct research, analyse data, gather requirements, and define end‐to‐end solutions Create architectural artefacts representing system functions, integrations, and user interfaces ...

Technology support I

Location
Greater London, England, United Kingdom
stability routines to identify recurring interruption patterns and support validated remediation actions aligned to resiliency and security expectations. Execute creative LLM-assisted software solutions; design, develop, and troubleshoot LLM-powered applications and services (e.g., retrieval augmented generation, agent workflows, structured extraction, classification) with a willingness to think beyond routine … assisted microservices, synchronous and asynchronous inference pipelines (streaming where appropriate), deterministic fallbacks, circuit breakers, and observability for reliability in production. Produce architecture and design artifacts, deliver model cards, system/data lineage, RAG/agent reference architectures, prompt libraries and versioning strategies, evaluation plans, and control evidence ensuring design ...

Python Technical Lead FinTech

Hiring Organisation
Run-Time Group Ltd
Location
City of London, London, United Kingdom
Employment Type
Permanent
major advantage. Key Responsibilities Technical Leadership Own the technical roadmap, guide architectural decisions, and ensure engineering excellence across backend services. Python Engineering Design and build robust, secure, and scalable microservices using Python (FastAPI, Django, Flask). System Architecture Lead the design of distributed systems, event-driven architectures … data intelligence. DevOps & Cloud Collaborate on CI/CD pipelines, containerisation (Docker, Kubernetes), and cloud deployments (AWS/GCP/Azure). Data & API Strategy Oversee API design, data modelling, and integration with internal and external financial systems. Security & Compliance Ensure systems meet regulatory, security, and audit ...

Symfony Developer

Location
Greater London, England, United Kingdom
that challenge and inspire you. Here's what a typical day might look like: Develop and maintain Symfony-based applications with clean, efficient code Design and implement RESTful APIs using API Platform or FOSRestBundle Build reusable bundles and Symfony components Integrate third-party services and APIs into applications … Optimize application performance and database queries Responsibilities Develop and maintain Symfony-based applications with clean, efficient code Design and implement RESTful APIs using API Platform or FOSRestBundle Build reusable bundles and Symfony components Integrate third-party services and APIs into applications Optimize application performance and database queries Write ...

Senior Data Architect

Location
Greater London, England, United Kingdom
across the firm to ensure our data products deliver value to our customers and they can be readily maintained and enhanced. This encompasses the design and architecture of logical and physical data models and schemas, data transport mechanisms, metadata management, lineage management, API schema design and enabling … financial information to be accessible to AI agents. What You Will Do Design, develop and maintain the technology-agnostic, business-aligned canonical/conceptual data models for Financial Information, defining class definitions, standards and association semantics. Provide data architecture expertise to all delivery teams to ensure we build data ...