Caspian One
Full Stack AI Developer - Capital Markets
Skills
1 month ago
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Important information
Contract type:
Freelance / Contract
Location:
London, UK
Work mode:
Onsite
Published on:
25 September 2026
What they need
About the Role
We are looking for both hands-on Full Stack Developers and Front End developers to join a growing team to design, build, and support AI-powered applications from the ground up in a fast-paced enterprise scale data environment for a growing Investment Bank.
You will own both the frontend and backend, work directly with modern Agentic AI frameworks, and help shape the architecture of a new platform and building a brand new data control plane. This is a builder’s role for developers who enjoy taking a product from a blank page to a production-grade, well-tested system.
What You’ll Do
- Design and build end-to-end features across the UI and backend API layers.
- Architect and structure new applications from scratch — data models, API contracts, service boundaries, and frontend structure.
- Build and integrate AI agent workflows using frameworks such as LangGraph, LangSmith, Strands SDK, and Agent Core.
- Develop responsive, accessible user interfaces with React.js, TypeScript, and/or Angular, including styling and UX polish.
- Design and implement backend APIs (REST and/or event-driven) that power the application and integrate with AI services.
- Work with relational and other data stores — modelling data, writing efficient queries, and building reliable data access layers.
- Build with security and access control in mind (authentication, authorization, role-based access) appropriate to a regulated financial environment.
- Write unit and regression test cases to ensure reliability and prevent regressions.
- Support and maintain the platform in production — monitoring, debugging, and iterating on live systems.
- Collaborate closely with data, platform, and business teams to deliver features in an Agile environment.
Required Qualifications
- Proven, hands-on experience building both UIs and backend APIs.
- Prior experience in financial services, investment banking or enterprise scale data environments.
- Strong frontend skills with React.js, TypeScript, and/or Angular.
- Solid backend development experience in a modern language (e.g., Python, Java, or Node.js).
- Experience with databases and SQL, including data modelling and query design.
- Experience designing application architecture and structure from scratch.
- Practical experience with Agentic AI frameworks: LangGraph, LangSmith, Strands SDK, and Agent Core.
- Experience writing unit and regression tests.
- Proficiency with Git and modern code review / CI-CD delivery practices.
- Comfortable owning both styling/frontend and backend/API concerns.
Nice to Have
- Cloud engineering experience with AWS, Azure, or Google Cloud Platform.
- Experience writing evals to measure and improve AI/agent performance.
- Experience supporting production platforms and CI/CD pipelines.
- Familiarity with containerization and infrastructure-as-code.
- Exposure to data governance concepts (lineage, cataloging, access control).
What We’re Looking For
A self-driven developer who is equally comfortable designing an architecture, styling a UI, wiring up an AI agent, and writing the tests that keep it all stable and someone who wants to build as well as own real products end to end.
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