26 to 50 of 56 API Design Jobs in London

adapt to evolving requirements Collaborate with stakeholders, vendors, and development teams Ensure non-functional requirements are met (e.g. security, scalability, performance) Support agile delivery and architectural runway planning Lead design reviews and resolve technical impediments Required Skills: Deep domain expertise in Corporate Payments (essential) and related financial services Strong experience in API design , microservices , and integration platforms More ❯

in a greenfield, lab-first environment to prototype, iterate, and deploy solutions that meet the highest standards of performance, security, and compliance in a regulated financial setting. Accountabilities & Responsibilities Design and develop modern, responsive front-end applications from the ground up using React, TypeScript, and Next.js. Build secure, performant user interfaces that integrate with LLM APIs (e.g., Gemini, Azure … systems. Implement advanced front-end security features including token handling, session management, data masking, and audit logging. Translate UX/UI designs into modular, reusable components aligned with enterprise design systems. Integrate front-end applications with REST/GraphQL APIs, WebSockets, and backend services. Collaborate with AI engineers, backend developers, and cloud architects to deliver end-to-end solutions. … regular code reviews. Deploy applications to GCP (Firebase, Cloud Run) and Azure App Services using CI/CD pipelines hardened for security and compliance. Participate in code reviews, technical design discussions, and architecture planning sessions. Required Knowledge, Skills & Experience Proven experience building secure, production-grade front-end applications in regulated environments (e.g., finance, healthcare, government). Strong proficiency in More ❯

the process from a candidate placement to onboarded contractor. This will then be extended to provide functionality to manage active placements, such as timesheets and expenses. This role will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team. About us SThree is the … markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future. What are the day-to-day tasks? Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines. Work with business stakeholders to understand opportunities and to design solutions that deliver the … required outcomes. Work with other technology teams to design and deliver end-to-end capabilities. Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems. Provide support to users and resolve systems issues. Configure CICD pipelines to support continuous delivery. Maintain infrastructure-as-code to build environments and applications. Focus on automation across More ❯

the Software Engineering group. In addition to contributing to feature development, you will play a role in shaping the technology and process strategies, and occasionally lead innovation or software design initiatives. Key Responsibilities: Develop new features with a strong focus on high-quality code. Conduct peer code reviews to ensure quality and adherence to best practices. Participate in daily … organization's objectives. Work closely with tech leads, engineers, testers, and other personnel to deliver high-quality products. Take ownership of initiatives related to innovation or addressing technical debt. Design, document, and communicate system solutions with a balanced focus on time, quality, cost, and performance. Collaborate with colleagues across the organization to gain buy-in and feedback on proposals … Required Knowledge & Experience: Essential: Strong proficiency in C# at a commercial level. Solid experience with .NET Core and related open-source technologies. Knowledge of Object Orientation, SOA, and relevant design patterns. Experience with modern software development practices, including agile methodologies , version control, code reviews, and continuous integration. Understanding of concurrency, asynchrony, and parallelism. Experience with Test Driven Development (TDD More ❯

the Software Engineering group. In addition to contributing to feature development, you will play a role in shaping the technology and process strategies, and occasionally lead innovation or software design initiatives. Key Responsibilities: Develop new features with a strong focus on high-quality code. Conduct peer code reviews to ensure quality and adherence to best practices. Participate in daily … organization's objectives. Work closely with tech leads, engineers, testers, and other personnel to deliver high-quality products. Take ownership of initiatives related to innovation or addressing technical debt. Design, document, and communicate system solutions with a balanced focus on time, quality, cost, and performance. Collaborate with colleagues across the organization to gain buy-in and feedback on proposals … Required Knowledge & Experience: Essential: Strong proficiency in C# at a commercial level. Solid experience with .NET Core and related open-source technologies. Knowledge of Object Orientation, SOA, and relevant design patterns. Experience with modern software development practices, including agile methodologies , version control, code reviews, and continuous integration. Understanding of concurrency, asynchrony, and parallelism. Experience with Test Driven Development (TDD More ❯

on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS … Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at a senior/principal level Strong knowledge of system architecture , cloud solutions, and API design Familiarity with DevOps tools and automation (CI/CD, containers, IaC) Track record of delivering secure, production-grade systems in agile teams Excellent stakeholder engagement, influencing, and More ❯

they're trusted with high-impact, mid-market projects with real business needs and quick delivery cycles. This is a client-facing, hands-on engineering role where you'll design and deliver solutions directly with clients. It's a mix of consulting and coding, ideal for engineers who want to see their work make an immediate impact. What You … ll Do Work closely with clients to solve their toughest challenges using Palantir Foundry and modern AI/data tools. Design and deploy scalable data pipelines, workflows, and applications. Model complex datasets and create APIs that deliver real business value. Collaborate with technical and non-technical stakeholders, shaping strategy as well as delivery. Own projects end-to-end in … scale data platforms such as: Snowflake, Databricks, AWS Glue/Redshift, Google BigQuery Software engineering skills in Python, Java, or TypeScript/React. Strong data modelling, pipeline development, and API design experience. Excellent problem-solving and communication skills. Why This Role Stands Out Impactful work at the intersection of AI, data, and business transformation. Autonomy and visibility in More ❯

they're trusted with high-impact, mid-market projects with real business needs and quick delivery cycles. This is a client-facing, hands-on engineering role where you'll design and deliver solutions directly with clients. It's a mix of consulting and coding, ideal for engineers who want to see their work make an immediate impact. What You … ll Do Work closely with clients to solve their toughest challenges using Palantir Foundry and modern AI/data tools. Design and deploy scalable data pipelines, workflows, and applications. Model complex datasets and create APIs that deliver real business value. Collaborate with technical and non-technical stakeholders, shaping strategy as well as delivery. Own projects end-to-end in … scale data platforms such as: Snowflake, Databricks, AWS Glue/Redshift, Google BigQuery Software engineering skills in Python, Java, or TypeScript/React. Strong data modelling, pipeline development, and API design experience. Excellent problem-solving and communication skills. Why This Role Stands Out Impactful work at the intersection of AI, data, and business transformation. Autonomy and visibility in More ❯

firm? Leigh Day is seeking an experienced Integration/Solutions Architect to join our IT team and play a pivotal role in a major digital transformation programme. You'll design and deliver seamless integrations between our core platforms, including Elite 3E, ShareDo, HubSpot, and SharePoint, ensuring our business-critical processes are efficient, scalable, and future-proof. The ideal candidate … with cross-functional teams and take ownership of high-impact projects. Required skills & experience Proven experience as an Integration Architect, Solutions Architect, or Senior Developer Strong technical expertise in API design (REST, SOAP), data mapping, middleware platforms, and ETL processes. Demonstrable experience integrating Elite 3E, ShareDo, HubSpot, and SharePoint (or similar enterprise systems). Solid understanding of data More ❯

architecture, and delivering meaningful impact in data-driven transformations, this is an opportunity to lead from the front. Key Responsibilities Lead complex agile consulting projects focused on data architecture design and delivery Advise technology leaders on modern best practices in data management Develop cloud-based enterprise data platforms using AWS, Azure, or GCP Define services and frameworks that enable … management, automation, and network architecture Tech Domains Cloud Platforms: AWS, Azure, GCP Data Management: Metadata tools, privacy frameworks, security architecture Modelling: ER, Contextual, Semantic, Logical/Physical Orchestration & Integration: API design, DevOps support, cloud-native workflows Why Join? Work on high-impact transformation projects with top-tier global banks Join an agile, innovation-focused culture with flat structure More ❯

of Angular and .NET projects. Proficiency in Angular (v12+), TypeScript, HTML5, CSS3, and RxJS. Solid experience with .NET Core/.NET 6+, C#, and Entity Framework. Experience with RESTful API design and integration. Familiarity with SQL Server or other relational databases. Understanding of CI/CD pipelines and version control systems (e.g., Git). Strong problem-solving skills More ❯

on : Write production-quality code across Node.js, Express, GraphQL, TypeScript, React, and React Native . Deliver front-end excellence : Build fast, responsive web apps using Vite, React Query, Context API, and CSS frameworks . Integrate emerging tech : Incorporate AI/ML APIs, LLM-driven features, and automation tooling into our products. Design for scale : Lead on API design, performance optimisation, and secure, cloud-ready architectures. Build the team : Recruit, mentor, and grow high-performing engineers while raising the quality bar. Collaborate : Translate product goals into clear technical execution through strong communication and cross-team alignment. Nice to Have Experience with orchestration frameworks ( LangChain, LangGraph ) and multi-agent workflows Knowledge of vector databases, RAG pipelines, and … lightweight model hosting Ability to design data pipelines and feedback loops for improving AI-driven features Awareness of emerging AI areas such as multimodal, edge AI, or AI in DevOps/observability Why Join? A leadership role with real ownership and autonomy A chance to shape the future of the engineering function while remaining close to the code Competitive More ❯

integrate with payment providers, manage disputes, and leverage ML for fraud detection and prevention. The reliability of these systems is business-critical for Spotify. What You'll Do Architect, design, and implement highly scalable backend services (Java/Python) and robust data pipelines that power Spotify's internal Commerce platform. Develop and enhance our ML-powered systems taking solutions … from concept to production. Take the lead on API design, platform development, and ensuring the scalability, reliability, and performance of our services. Collaborate with a talented, cross-functional team of engineers, product managers, and data scientists to deliver impactful solutions. Mentor other engineers and foster a culture of continuous learning and technical excellence within the team. Who You More ❯

world as Netflix and Amazon- with the freedom to explore new ideas and approaches to champion great cinema for millions of film lovers worldwide. Where you'll have impact: Design, develop, and maintain robust backend services using Ruby on Rails and relational databases Build and optimize APIs that power our web, mobile, and TV applications across global markets Implement … Requirements: 2+ years of professional backend development experience Strong proficiency in Ruby on Rails and relational databases Experience with distributed systems and caching strategies (Redis, ElasticSearch) Solid understanding of API design and RESTful principles Experience with background job processing using Sidekiq or similar queue systems Knowledge of AWS services and cloud infrastructure A strong enthusiasm for quick learning More ❯

technical audiences Desirable skills NoSQL databases (eg. Cosmos DB, DynamoDB, MongoDB) Message queues and event streaming platforms (e.g. Service Bus, Event Hub) Infrastructure-as-code (eg. Terraform) Knowledge of API design principles (REST APIs), authentication, and security Our Commitment to DE&I At Moneybox, we promote, support and celebrate inclusion, diversity and equity for all, so that everyone More ❯

projects within the firm that suit your experience should you wish to continue with Deloitte. About the role: We are seeking an experienced Enterprise Architect to lead the strategic design of our application portfolio strategy. This role requires a deep understanding of application architecture principles, software development methodologies, cloud computing, cybersecurity, and enterprise architecture best practices. The successful candidate … strategic goals. Act as a trusted advisor to senior management and business leaders. Influence and shape technology decisions related to application development and deployment across the firm. Lead the design of complex and innovative application solutions , integrating various applications with other enterprise systems and cloud platforms. Provide strategic guidance and leadership to the application architecture team and related stakeholders … Intelligence, Case Management and Workflow. Leadership - Experienced at successfully leading and delivering complex application architecture and integration architectures. Deep understanding of application architecture patterns, software development methodologies ( Agile, Waterfall ), API design, integration technologies (ESB, message queues) and cloud-native application development. Communication: can present and articulate complex technical concepts to both technical and non-technical stakeholders across all More ❯

projects within the firm that suit your experience should you wish to continue with Deloitte. About the role: We are seeking an experienced Enterprise Architect to lead the strategic design of our application portfolio strategy. This role requires a deep understanding of application architecture principles, software development methodologies, cloud computing, cybersecurity, and enterprise architecture best practices. The successful candidate … strategic goals. Act as a trusted advisor to senior management and business leaders. Influence and shape technology decisions related to application development and deployment across the firm. Lead the design of complex and innovative application solutions , integrating various applications with other enterprise systems and cloud platforms. Provide strategic guidance and leadership to the application architecture team and related stakeholders … Intelligence, Case Management and Workflow. Leadership - Experienced at successfully leading and delivering complex application architecture and integration architectures. Deep understanding of application architecture patterns, software development methodologies ( Agile, Waterfall ), API design, integration technologies (ESB, message queues) and cloud-native application development. Communication: can present and articulate complex technical concepts to both technical and non-technical stakeholders across all More ❯

projects within the firm that suit your experience should you wish to continue with Deloitte. About the role: We are seeking an experienced Enterprise Architect to lead the strategic design of our application portfolio strategy. This role requires a deep understanding of application architecture principles, software development methodologies, cloud computing, cybersecurity, and enterprise architecture best practices. The successful candidate … strategic goals. Act as a trusted advisor to senior management and business leaders. Influence and shape technology decisions related to application development and deployment across the firm. Lead the design of complex and innovative application solutions , integrating various applications with other enterprise systems and cloud platforms. Provide strategic guidance and leadership to the application architecture team and related stakeholders … Intelligence, Case Management and Workflow. Leadership - Experienced at successfully leading and delivering complex application architecture and integration architectures. Deep understanding of application architecture patterns, software development methodologies ( Agile, Waterfall ), API design, integration technologies (ESB, message queues) and cloud-native application development. Communication: can present and articulate complex technical concepts to both technical and non-technical stakeholders across all More ❯

projects within the firm that suit your experience should you wish to continue with Deloitte. About the role: We are seeking an experienced Enterprise Architect to lead the strategic design of our application portfolio strategy. This role requires a deep understanding of application architecture principles, software development methodologies, cloud computing, cybersecurity, and enterprise architecture best practices. The successful candidate … strategic goals. Act as a trusted advisor to senior management and business leaders. Influence and shape technology decisions related to application development and deployment across the firm. Lead the design of complex and innovative application solutions , integrating various applications with other enterprise systems and cloud platforms. Provide strategic guidance and leadership to the application architecture team and related stakeholders … Intelligence, Case Management and Workflow. Leadership - Experienced at successfully leading and delivering complex application architecture and integration architectures. Deep understanding of application architecture patterns, software development methodologies ( Agile, Waterfall ), API design, integration technologies (ESB, message queues) and cloud-native application development. Communication: can present and articulate complex technical concepts to both technical and non-technical stakeholders across all More ❯

with teams or directly taking responsibility for tasks (writing code, configuration, tooling, documentation). Work with our Information Security teams to ensure security policies are implemented efficiently and flexibly. Design, build, operate monitoring and alerting technology for large, complex multi-site B2C and B2B applications. Design, build, operate, and optimize logging technology to gather comprehensive data on sites … you'll bring: Engineering expertise in complex Salesforce environments. Experience with Copado for CI/CD is a plus. Exposure to Cloud Native software development, including cloud infrastructure and API design (Azure preferred). Experience with modern standards such as OWASP CI/CD, DSOMM, SAMM, and cloud security posture management systems like Azure Defender and Prisma Cloud. … Models as part of risk assessment, including remediation plans (preferred). Experience with DAST systems such as OpenZAP and Qualys DAST, ideally with HTTP APIs (preferred). Knowledge of API security models, including OAuth2 and Zero Trust concepts (preferred). Experience with Azure DevOps, multi-stage pipelines, and managing large-scale software estates from an operational perspective (build, release More ❯

financial services. We're looking for an experienced eFX Software Engineer to build secure, high-performance trading systems in a collaborative, inclusive, and agile environment. What you'll do: Design and develop low-latency, fault-tolerant trading architectures Lead complex software initiatives using modern Java patterns (low-GC, lock-free) Collaborate across teams to deliver robust trading platforms and … optimisation, and CPU/memory management In-depth knowledge of networking protocols (TCP, UDP, Multicast, FIX) Experience in electronic/algorithmic trading and FX products Background in automated testing, API design, and DevOps workflows Ability to translate business needs into scalable technical solutions Flexible working options available. This is your chance to work on impactful projects and shape More ❯

Experience working closely with product teams and designing for real users Strong frontend skills (JavaScript/Typescript, React/Angular, HTML) and backend expertise (Node.js, Python) Proven experience in API design and system integration Proficiency with Microsoft Azure and familiarity with databases, IAM, containers, and deployment tools Comfortable with rapid prototyping tools (e.g., Figma) Solid understanding of the … platforms Support low-code solutions, especially within Power Platform Agile & Iterative Development Work within a modern agile framework Participate in backlog grooming, technical scoping, and story writing Engage in design sessions, code reviews, and retrospectives Security, Quality & Operations Ensure compliance with security, privacy, and operational standards Monitor and improve the health of production code Enhance testing and deployment pipelines More ❯

that power AI-enhanced desktop applications. These services support intelligent features like local inference, contextual awareness, and model interaction, tailored specifically for Electron-based or hybrid clients. Platform-Aware API Design Collaborating closely with desktop and React Native teams, you will shape API contracts that reflect platform constraints and performance considerations - ensuring native-like responsiveness and cross More ❯

Backend Engineer (Python/Django) | Hybrid 1 | Full-time We're looking for a Mid-Level Backend Engineer to join a fast-growing tech team. You'll design, build, and maintain scalable Back End services and APIs, contributing to high-performing, secure, and user-friendly applications. What you'll bring: 3+ years Back End development in production Strong Python … Django (4+ years) SQL database expertise & optimisation skills REST API design experience CI/CD, Git, and testing familiarity Strong collaboration and time management skills Nice to have: Fintech, payments, E-commerce, or AI coding assistant experience. The company is a very successful payment platform that is recruiting because of growth. In addition to the base salary there … offer a good Bonus, Private Health care, Pension plan and 26 days holidays excluding Bank Holidays. Role responsibilities: Collaborate with all relevant departments to deliver end to end features Design, build and maintain scalable Back End services and APIs Using Git for version control and tracking code changes Write secure, maintainable and well documented code Diagnosing and resolving system More ❯

s APIs and SDKs, ensuring they empower customers to programmatically interact with our platform in scalable, secure, and developer-friendly ways. Shape the developer experience: Partner with engineering and design to ensure our APIs and SDKs are consistent, intuitive, well-documented, and performant. Interoperate with the modern data stack: Ensure first-class integration with data warehouses, lakes, and real … time streaming platforms Support enterprise scale: Design for performance, reliability, security, and compliance requirements of large enterprises. Engage with customers and partners: Gather feedback from data engineers, architects, and developers from both our customer base and partner ecosystem to ensure our APIs and SDKs solve real-world problems that fit naturally into enterprise data ecosystems. Establish success measures: Define … and track adoption metrics, usage analytics, and developer satisfaction scores to ensure continuous improvement. Stay ahead of industry trends: Monitor advancements in data integration, streaming, and SDK/API design to keep Ataccama competitive and developer-friendly. Is This You? Industry experience: Experience in B2B and SaaS product companies is a must Proven experience: 5-7+ years More ❯