26 to 46 of 46 API Design Jobs in the City of London

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 ❯

where your work will have direct global impact. In this role, you will own the full data stack from ingestion through to analytics, building and maintaining scalable pipelines across API, streaming, and batch processes. You will manage cloud infrastructure on AWS with a DevOps mindset, including CI/CD, infrastructure as code, monitoring, and scaling. Working closely with engineering … and team development. Build, ship, and refine high‐quality features that directly support conservation and sustainability. What They’re Looking For: 5+ years of backend experience with Go, including API design, microservices, and database systems like PostgreSQL. Solid frontend skills with React/Next.js, TypeScript. Experience building scalable, reliable SaaS products that are cleanly architected and maintainable. Strong … knowledge of AWS, CI/CD pipelines, containerisation, and DevOps best practices. A thoughtful approach to system design, balancing performance, scalability, and simplicity. Someone who thrives in fast‐moving, early‐stage environments and enjoys solving deep technical challenges. A great collaborator who values teamwork, communication, and shared mission. What's on offer: £80-95k + meaningful Equity More ❯

where your work will have direct global impact. In this role, you will own the full data stack from ingestion through to analytics, building and maintaining scalable pipelines across API, streaming, and batch processes. You will manage cloud infrastructure on AWS with a DevOps mindset, including CI/CD, infrastructure as code, monitoring, and scaling. Working closely with engineering … and team development. Build, ship, and refine high‐quality features that directly support conservation and sustainability. What They’re Looking For: 5+ years of backend experience with Go, including API design, microservices, and database systems like PostgreSQL. Solid frontend skills with React/Next.js, TypeScript. Experience building scalable, reliable SaaS products that are cleanly architected and maintainable. Strong … knowledge of AWS, CI/CD pipelines, containerisation, and DevOps best practices. A thoughtful approach to system design, balancing performance, scalability, and simplicity. Someone who thrives in fast‐moving, early‐stage environments and enjoys solving deep technical challenges. A great collaborator who values teamwork, communication, and shared mission. What's on offer: £80-95k + meaningful Equity More ❯

products. Our stack includes React, TypeScript, Next.js, and Google Cloud Platform (GCP). You’ll collaborate closely with designers to create exceptional user experiences, and with platform engineers to design and implement serverless APIs and background services that scale globally. This is a fantastic opportunity to join a rapidly growing startup as we enter the next phase of expansion. … as a software engineer (or equivalent commercial experience) Strong knowledge of React, TypeScript, and Next.js Experience with GCP or another cloud provider (e.g. AWS, Firebase, or Azure) Understanding of API design and asynchronous data handling Familiarity with CI/CD workflows and version control (Git) Strong problem-solving skills and attention to detail Comfortable working in a fast More ❯

products. Our stack includes React, TypeScript, Next.js, and Google Cloud Platform (GCP). You’ll collaborate closely with designers to create exceptional user experiences, and with platform engineers to design and implement serverless APIs and background services that scale globally. This is a fantastic opportunity to join a rapidly growing startup as we enter the next phase of expansion. … as a software engineer (or equivalent commercial experience) Strong knowledge of React, TypeScript, and Next.js Experience with GCP or another cloud provider (e.g. AWS, Firebase, or Azure) Understanding of API design and asynchronous data handling Familiarity with CI/CD workflows and version control (Git) Strong problem-solving skills and attention to detail Comfortable working in a fast More ❯

growing client traffic. You’ll own the technical roadmap, ship code daily, and translate priorities between engineers and the C-suite. What you’ll do Hands-on architecture & coding – design and deliver TypeScript across Next.js, Node, GraphQL/tRPC and supporting services. Browser automation & AI integration - extend and maintain headless test flows (Puppeteer/Playwright/Selenium) that power … front end and back end. Proven delivery of SaaS or platform work - moving from prototype to hardened, multi-tenant production. Solid with React/Next.js SSR/SSG patterns, API design (REST and/or GraphQL), and database-backed services. Comfortable designing and operating AWS infrastructure via Terraform (or Pulumi, CDK). Hands-on experience with browser automation … bureaucracy environment where decisions translate quickly into action. Interview process (2–3 weeks total) Intro call Culture & mutual fit (basic engineering process questions) 30 min Technical deep-dive System design, code walkthrough 90 min Executive panel Roadmap discussion & Q&A 45 min Offer References & negotiation – Ready to scale automated UX assessment for the world’s leading brands More ❯

As Solutions Architect, you’ll act as a bridge between engineering, business, and clients, blending deep technical expertise with a sharp understanding of customer needs. Expect to lead solution design, drive proof-of-concepts, and collaborate directly with senior stakeholders on high-impact projects. Key skills as a Solutions Architect: Proven background in software engineering with a strong grasp … of API design, cloud architecture, and scalable system design. Hands-on coding experience with modern technologies including Typescript (Node.js/React), AWS, Kubernetes, GraphQL, Kafka. Track record of working directly with clients on technical solutions, RFPs, and complex integrations. Ability to build prototypes and proof-of-concepts that validate ideas and showcase value. Expertise in CRMs, e-commerce More ❯

As Solutions Architect, you’ll act as a bridge between engineering, business, and clients, blending deep technical expertise with a sharp understanding of customer needs. Expect to lead solution design, drive proof-of-concepts, and collaborate directly with senior stakeholders on high-impact projects. Key skills as a Solutions Architect: Proven background in software engineering with a strong grasp … of API design, cloud architecture, and scalable system design. Hands-on coding experience with modern technologies including Typescript (Node.js/React), AWS, Kubernetes, GraphQL, Kafka. Track record of working directly with clients on technical solutions, RFPs, and complex integrations. Ability to build prototypes and proof-of-concepts that validate ideas and showcase value. Expertise in CRMs, e-commerce More ❯

in tight cycles. This is an early-stage, hands-on role with significant autonomy and responsibility to drive backend product development, collaborating closely with founders, creators, and product/design to turn lean specs into reliable, scalable services. Responsibilities Implement features end-to-end on the backend (APIs → data models → integrations) and maintain quality while moving fast. Run tight … safety guardrails). Essential Requirements 2–4+ years building production backends/services , with shipped work and clear ownership. Strong Python (FastAPI) and database skills ( PostgreSQL/MongoDB ); solid API design fundamentals. Familiarity with AWS serverless patterns and Docker for bespoke services; basic CI/CD concepts. Comfortable with Redis (caching/sessions) and common queue/messaging More ❯

in tight cycles. This is an early-stage, hands-on role with significant autonomy and responsibility to drive backend product development, collaborating closely with founders, creators, and product/design to turn lean specs into reliable, scalable services. Responsibilities Implement features end-to-end on the backend (APIs → data models → integrations) and maintain quality while moving fast. Run tight … safety guardrails). Essential Requirements 2–4+ years building production backends/services , with shipped work and clear ownership. Strong Python (FastAPI) and database skills ( PostgreSQL/MongoDB ); solid API design fundamentals. Familiarity with AWS serverless patterns and Docker for bespoke services; basic CI/CD concepts. Comfortable with Redis (caching/sessions) and common queue/messaging More ❯

across the stack, with strong front end focus (React, Angular, or Vue). Proficiency in building modern web applications from scratch (not only visualization layers). Strong skills in API design and integration. Experience (or strong demonstrable capability) in developing customer-facing AI-powered tools (chatbots, semantic search, or other LLM integrations). Familiarity with AWS cloud services More ❯

across the stack, with strong front end focus (React, Angular, or Vue). Proficiency in building modern web applications from scratch (not only visualization layers). Strong skills in API design and integration. Experience (or strong demonstrable capability) in developing customer-facing AI-powered tools (chatbots, semantic search, or other LLM integrations). Familiarity with AWS cloud services More ❯

Software Architect to join their fast-growing and dynamic team. This is an exciting opportunity to work on cutting-edge projects, collaborating with engineers, stakeholders, and business leaders to design and deliver high-impact software systems. Tech Stack: Frontend: Angular.JS/TypeScript Backend: Swift (Swift Vapor) Key Responsibilities Lead the architecture and design of complex, scalable software solutions. … Software Architect or Senior Engineering roles. Strong expertise with Angular.JS/TypeScript. Solid hands-on experience with Swift, ideally Swift Vapor for Back End services. Proven track record in API design and development. Excellent interpersonal and communication skills to engage with both technical and non-technical stakeholders. Package & Location Salary: £85,000 per annum + Benefits Location: Central More ❯

Software Architect to join their fast-growing and dynamic team. This is an exciting opportunity to work on cutting-edge projects, collaborating with engineers, stakeholders, and business leaders to design and deliver high-impact software systems. Tech Stack: Frontend: Angular.JS/TypeScript Backend: Swift (Swift Vapor) Key Responsibilities Lead the architecture and design of complex, scalable software solutions. … Software Architect or Senior Engineering roles. Strong expertise with Angular.JS/TypeScript. Solid hands-on experience with Swift, ideally Swift Vapor for Back End services. Proven track record in API design and development. Excellent interpersonal and communication skills to engage with both technical and non-technical stakeholders. Package & Location Salary: £85,000 per annum + Benefits Location: Central More ❯

with your front-end counterpart to ensure alignment across the stack, to support the firm's market-making business across ranging Equities, FX, Crypto & Commodities asset classes Lead the design, development, and maintenance of the infrastructure estate, microservices, web APIs, and the business logic delivery, keeping projects on track and within scope. Drive technical decisions and trade-offs balancing … the role, including all relevant regulatory and legislative training KEY SKILLS AND EXPERIENCE Strong expertise in Java, Spring Framework/Spring Boot, or related backend frameworks Solid understanding of API design, microservices, and distributed messaging architectures Solid experience in advocating for and mentoring other team members, promoting coding reviews, enforcing team conventions Track record in driving initiatives/ More ❯

within the organisation. Contract details: 700 DR Inside IR35 12 month contract ASAP start date Hybrid - as and when required in London (infrequent travel) Skillset: Background in Software Architecture API design (REST is preferable). ++ Designing for use with User Interfaces would be a plus. Event-driven architecture patterns Familiarity with AWS and Kubernetes (Containers) would be More ❯

within the organisation. Contract details: 700 DR Inside IR35 12 month contract ASAP start date Hybrid - as and when required in London (infrequent travel) Skillset: Background in Software Architecture API design (REST is preferable). ++ Designing for use with User Interfaces would be a plus. Event-driven architecture patterns Familiarity with AWS and Kubernetes (Containers) would be More ❯

Event-Driven Architecture | Performance | Testing Why You’ll Love This Role Tackle large-scale data processing, bulk operations, big file handling, and stream processing Build a new public-facing API powering multiple platforms Collaborate with talented engineers on high-impact projects Work on data-heavy systems where performance really counts Ship solutions quickly in a fast-moving, agile environment … and TypeScript (NestJS or similar frameworks) A proven track record optimising performance for large files, bulk ops, and streaming data Solid understanding of event-driven systems , queues, and scalable API design (REST, OpenAPI/Swagger) Strong testing skills (unit & integration, ideally with Jest) Pragmatic, delivery-focused mindset with clean, maintainable code Bonus: experience working in Agile environments (Scrum More ❯

execution for a core pillar of this new platform. You will operate as the single-threaded owner for a critical domain, working across engineering, AI/ML, research, and design to deliver a seamless and scalable product experience. This role is a rare opportunity to define the strategy for a zero-to-one system—shaping how content is modeled … foundational capability within IDC’s next-gen discovery platform. Define the data models, technical architecture, and platform interfaces that power intelligent, context-aware product experiences. Partner with engineering to design and deliver scalable APIs, system components, and observability layers that enable extensibility and reuse. Collaborate with AI/ML teams to integrate capabilities such as semantic search, LLM-powered … or equivalent technical experience. Proven track record of shipping 0→2 products or scaling platform capabilities in ambiguous, high-accountability environments. Deep technical fluency—you can meaningfully shape architecture, API design, and system trade-offs with engineering teams. Exceptional written and verbal communication skills; able to influence VP- and SVP-level stakeholders. Demonstrated ability to lead cross-functional More ❯

open data space, who are currently seeking an experienced Senior iOS Developer. You will be responsible for building and maintaining new and exciting features while also driving technical discussions, API designs and architecture. You will get the opportunity to make a big impact in a rapidly growing business. Their culture is based on working together, collaboration and being supportive More ❯

you are excited by the challenge of building the commercial and trust-based foundation of a new product category, this role is for you. Key Responsibilities Monetization & Platform Architecture ? Design, build, and own the end-to-end metering and entitlements system that powers our freemium business model, targeting a 30% premium conversion rate. ? Architect and manage our core database … e.g., PostgreSQL) and caching (e.g., Redis) systems. ? Demonstrated experience building services on a major cloud platform (e.g., AWS, Azure, GCP). ? Strong understanding of distributed systems, microservices architecture, and API design. Security & Compliance ? A deep and demonstrable security-first mindset. ? Hands-on experience implementing security best practices at the application layer, including authentication (e.g., OAuth 2.0, JWT), authorization (RBAC More ❯