15 of 15 API Design Jobs in the City of London

their latest platform, provide technical expertise at both the architectural and hands-on development levels, and mentor junior team members. What You’ll Do: Design and build scalable payment applications and APIs Develop modern frontend interfaces and backend services Integrate with payment providers and financial systems Optimise database performance …/Angular), HTML5, CSS3 Backend: Python REST APIs Data: MySQL, PostgreSQL, Redis Cloud & DevOps: AWS, Docker, CI/CD, Kubernetes (nice to have) Architecture: API design, OAuth/JWT authentication, queues, webhooks, payment integrations Previous experience in Financial Services What We’re Looking For: Strong system design ...

GlobalLogic, a Hitachi Group Company and a leader in digital engineering. We help brands across the globe design and build innovative products, platforms, and digital experiences for the modern world. By integrating experience design, complex engineering, and data expertise - we help our clients imagine what’s possible … Experience with: Experience with Python for data pipelines, export services, ETL, reconciliation, profiling scripts Data quality assessment Apache Kafka PostgreSQL for data modelling, query design, migrations etc Data modelling and schema design REST API design Ideally you will have: Experience of C# to be able ...

Data Analytics, and Software Development, the team is revolutionising the auditing process to deliver smarter, faster, and more reliable outcomes. Our mission is to design and implement robust, intelligent, and scalable technologies that not only streamline workflows but also enhance audit quality and generate actionable insights for auditors … backend development as a Senior role. Languages/Frameworks: Strong proficiency in Python with hands-on experience in asynchronous programming, concurrency and multithreading. API Expertise: Proven experience in building and integrating APIs, with expertise in API documentation and schema definition using OpenAPI/Swagger. Strong understanding of RESTful ...

large-scale financial data platform, modernising legacy enterprise systems while building scalable cloud-based services on AWS. Own SQL Server optimisation, backend service design, and API development in a high-impact platform modernisation initiative. What You'll Do Develop and optimise SQL Server queries, stored procedures, and data … processing logic Design and build backend services in Python or C# Modernise legacy platforms and improve system performance Build and maintain AWS-hosted services and APIs Collaborate with distributed engineering and product teams Top Skills Required Advanced SQL Server expertise (performance tuning, indexing, complex queries) – non-negotiable Backend development ...

internal systems. You will work within cross-functional agile squads and are expected to contribute from day one with minimal ramp-up. Key Responsibilities: Design, develop, and deliver high-quality Java microservices in support of back-office platform integration Build and maintain RESTful and event-driven APIs supporting settlement … reconciliation, corporate actions, and custody workflows Integrate with third-party financial platform APIs and messaging systems Contribute to technical design discussions, architecture reviews, and solution documentation Write clean, well-tested, production-grade code with appropriate unit, integration, and contract testing coverage Participate in code reviews and uphold engineering standards ...

Role: Senior Web Application Developer (Full-Stack) Specialism(s): eCommerce, ASP.NET MVC 5, C#, React, Migrations, Microsites, Cloud-Native, HTML5/CSS3/JavaScript, API, CI/CD, IoC Containers, Agile Type: Contract, Daily Rate Duration: 3+ Months Location: London Pay Rate: £450 - £525 per day (Inside IR35 … ready environment. Role Requirements Develop and maintain complex web solutions using ASP.NET MVC 5, C#, and React Support migration activities, ensuring clean architecture, scalable design, and efficient implementation Produce secure, maintainable, scalable, and fault-tolerant code following SOLID principles and OO design patterns Contribute to front-end development ...

core stack includes: The Engine: Expert-level C# and .NET Core mastery. Architecture: Deep understanding of SOA (Service Oriented Architecture) and complex Object-Oriented design patterns. System Dynamics: Specialized knowledge of concurrency, asynchrony, and parallelism —essential for real-time transactional processing. Data & Web: High proficiency in SQL Server … API design, and modern front-end fundamentals (HTML/CSS/JS). Reliability: A strict practitioner of TDD (Test Driven Development) and robust CI/CD processes. Desired Innovations Our client is actively modernizing. Exposure to the following is highly valued: Cloud & Orchestration: Azure ecosystems, Docker ...

GlobalLogic, a Hitachi Group Company and a leader in digital engineering. We help brands across the globe design and build innovative products, platforms, and digital experiences for the modern world. By integrating experience design, complex engineering, and data expertise - we help our clients imagine what’s possible … working. Initially 6-9 months About the role: Experience with C#/.NET Additional languages highly desirable ie Java, Python React/TypeScript RESTful API design Apache Kafka PostgreSQL Git/GitHub workflows Experience with Kubernetes deployments; able to build CI/CD pipelines About you (ideally ...

people actually love to use? We are representing a globally recognized digital product studio that sits at the sweet spot of high-end aesthetic design and hardcore engineering. They're looking for a Senior & Lead Full-stack Engineer to join the growing function. This isn't a "ticket-taking … robust, scalable backend. What You Bring to the Table React Node/TypeScript/JavaScript Cloud: AWS, Azure, or GCP. APIs: API design and integration (REST & GraphQL). AI Tooling: Confident using AI-boosted environments to ensure quality (Claude or similar). The Cherry ...

technical initiatives across multiple teams Experience designing scalable, high-performance systems Experience working with legacy or monolithic systems and modernising them Strong understanding of API design and distributed systems Knowledge of modern engineering practices, including CI/CD and DevSecOps Understanding of secure development practices such as OWASP ...

This role is designed for engineers who have built and operated large-scale systems end-to-end, not those with superficial exposure or purely design-focused experience. Candidates must have strong experience of Java Full Stack, React, Kubernetes & Docker. Experience in building responsive, component based user interfaces using modern … front end frameworks. Hands on expertise in API design and development (REST/JSON), including versioning and backward compatibility. Experience with UI testing, component testing, and front end build tooling. Experience in CI/CD pipelines, GitOps workflows, A/B testing strategies and also automating the workflows ...

engineering hires, you will play a key role in building and scaling the core platform , working closely with the CTO and senior engineers to design, develop and deploy new features. This is a hands-on role with real ownership and impact on product direction. Requirements 2+ years of commercial … production web applications (not just data science scripts) Experience with Docker and containerised applications Experience working with relational databases (e.g. PostgreSQL) Good understanding of API design and backend architecture Proficiency with Git Willingness to work 2 days per week onsite in London Nice to have Exposure ...

direction. Clear communication skills are a must, as well as an ability to operate in ambiguity. Non-Negotiables Python FastAPI – or adjacent Python frameworks API design and backend architecture fundamentals PostgreSQL and/or MongoDB experience Strong React or React Native experience AWS serverless infrastructure and Docker experience ...

systems in production and 3–5 years of substantive software/platform engineering Deep JavaScript/Node.js skills Azure Fluency JSON data structures, REST API design, and complex semi-structured data Practical LLM application — RAG architectures, prompt engineering etc Comfort with both relational (MS SQL) and document (MongoDB ...

Acting as a senior technical authority, championing Wilmington s composable, microservice-based platform strategy and making sound architectural decisions on integration approaches and system design • Proactively identifying and mitigating technical risks and support the CTO with technical due diligence for future acquisitions • Operating across multiple scrum teams, bridging project … architecture experience, providing the credibility to confidently interrogate system designs, integration strategies, and technical trade-offs • Strong expertise in composable, microservice-based architectures, including API design, event-driven integration, and service decomposition • Proven track record delivering large-scale platform integration or migration programmes across complex, multi-system ...