5 of 5 Contract API Development Jobs in London

building and enhancing modern applications, APIs, and cloud-native services, whilst mentoring developers and promoting engineering best practice. Key Responsibilities Lead the design and development of robust, scalable software solutions Drive technical decision-making and provide guidance to development teams Develop and maintain RESTful APIs and microservices Build … quality, automated testing, and CI/CD best practices Support deployment, containerisation, and platform optimisation activities Essential Skills & Experience Strong commercial experience with Node.js API development using REST and OpenAPI Web application development using HAPI Database expertise across PostgreSQL , MongoDB , and Redis Unit testing with Jest ...

indices is a strong plus, as this role may support tooling and data platforms used by commodities trading, research, or risk functions. Key Responsibilities Development * Design, develop, and maintain backend services in Python, including asynchronous task processing using Celery, Redis (as broker/result backend), Celery Beat (scheduled/… throughout the project lifecycle. Testing & Quality Assurance * Write and maintain unit, integration, and end-to-end tests for both backend (Python/Celery/API) and front-end (React) code. * Validate asynchronous task pipelines for correctness, idempotency, retry behavior, and failure handling. * Participate in code reviews, ensuring adherence ...

Security Clearance (SC) is essential for this position. We are seeking a Mid Backend Engineer to join a delivery pod, contributing to the design, development and maintenance of scalable, resilient backend systems. The role will specialise in event-driven architecture and CQRS-based systems, working within a collaborative engineering … environment to deliver robust, distributed solutions. The successful candidate will have strong backend development experience, a solid understanding of architectural patterns and practical experience building event-driven applications. Key Responsibilities Design, develop and maintain backend services and applications within a pod-based delivery model. Implement and support systems built ...

working on multiple contract opportunities within leading financial services environments, spanning trading, risk and full-stack engineering. If you have extensive Python development experience and a background in high-performance trading or financial services environments, we'd love to hear from you. The opportunities We're looking for experienced … supporting trading workflows and financial markets. Risk Engineering: Building Back End services and distributed systems for risk data processing, analytics and reporting. Full-Stack Development: Building scalable applications across Back End services, APIs and Front End technologies. Financial Platforms: Improving business-critical systems, data processing pipelines and enterprise-grade ...

experienced Oracle E-Business Suite (EBS) Technical lead with expertise in supporting and enhancing Oracle EBS R12 environments. Responsible for technical design, development, system integrations, application architecture, production support, upgrade initiatives, and API enablement using Oracle Integrated SOA Gateway (ISG). Key Responsibilities Design, develop, test, and deploy … Collaborate with business and functional teams to translate requirements into scalable technical solutions. Develop and support interfaces, conversions, reports, and custom extensions using Oracle development technologies. Build, expose, and support REST and SOAP APIs using Oracle Integrated SOA Gateway (ISG) to enable secure integration between Oracle EBS and external ...