AI-Driven Full-Stack Engineer: Build from Scratch

Caspian One; England; On-site; GBP 70,000 - 110,000; Full time

Job summary

Caspian One in the United Kingdom is seeking a hands-on Full Stack Developer to design, build, and support AI-powered applications for a fast-paced investment bank. You will own both frontend and backend, work with AI agent frameworks, and help shape a brand-new data control plane.

You will design end-to-end features, build architectures from scratch, and collaborate with data, platform, and business teams in an Agile environment.

Qualifications

• Proven, hands-on experience building UIs and backend APIs.
• Strong frontend skills with React.js, TypeScript, and/or Angular.
• Solid backend experience in a modern language (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 AI frameworks: LangGraph, LangSmith, Strands SDK, and Agent Core.
• Experience writing unit and regression tests.
• Proficiency with Git and modern CI/CD delivery practices.

Responsibilities

• 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 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, authorisation, 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.

Skills

React.js

TypeScript

Angular

Python

Java

Node.js

SQL / Data Modelling

API Design

Git / CI-CD

Security / RBAC

Tools

LangGraph

LangSmith

Strands SDK

Agent Core

AWS

Docker

Kubernetes

Job description

Caspian One in the United Kingdom is seeking a hands-on Full Stack Developer to design, build, and support AI-powered applications for a fast-paced investment bank. You will own both frontend and backend, work with AI agent frameworks, and help shape a brand-new data control plane.

You will design end-to-end features, build architectures from scratch, and collaborate with data, platform, and business teams in an Agile environment.