Senior AI-Driven Full-Stack Engineer

The Portfolio Group; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

The Portfolio Group is seeking a Senior Software Engineer to own the application and integration layer behind AI-powered products. You will work across the full stack, designing services, APIs, and interfaces connecting AI capabilities to the products customers and colleagues use every day.

You'll play a key role in building MCP integrations, agent-to-agent connectivity and robust API services, while also developing responsive, accessible interfaces in React and TypeScript.

Qualifications

• Strong Python experience for backend and integration development.
• Strong TypeScript/JavaScript and React experience building production applications.
• Strong API design experience, including REST/GraphQL, authentication, authorization, versioning and streaming.
• Hands-on MCP or comparable tool/plugin integration technologies, with interest in AI agents.
• Solid experience with AWS services (Lambda, ECS, API Gateway, S3, CloudFront, Cognito, IAM).
• Experience designing and operating distributed or event-driven systems.
• Good understanding of observability, testing and CI/CD.
• Experience with data platforms such as MongoDB, OpenSearch or Databricks.

Responsibilities

• Own the application and integration layer of AI products end to end, including APIs and frontend development.
• Design, build and maintain MCP servers exposing systems to AI agents.
• Develop agent-to-agent connectivity with message contracts, state management and retries.
• Design scalable APIs using REST/GraphQL with authentication, authorization and streaming.
• Build production frontend applications using React, TypeScript and JavaScript.
• Collaborate with UX/product teams to deliver accessible, responsive interfaces.
• Develop AI-specific user experiences with streaming results and source information.
• Integrate with internal and third-party services focusing on security and reliability.
• Establish automated testing across backend and frontend (unit, contract, E2E).
• Work with platform engineering on deployment, observability, logging and runtime readiness.
• Provide architectural guidance and mentoring to other engineers.

Skills

Python backend

TypeScript

React

API design

CI/CD

Observability

Testing

Mentoring

Tools

MCP (Model Context Protocol)

AWS (Lambda, ECS, API Gateway, S3, CloudFront, Cognito, IAM)

MongoDB

OpenSearch

Databricks

REST/GraphQL

WebSockets

Job description

The Portfolio Group is seeking a Senior Software Engineer to own the application and integration layer behind AI-powered products. You will work across the full stack, designing services, APIs, and interfaces connecting AI capabilities to the products customers and colleagues use every day.

You'll play a key role in building MCP integrations, agent-to-agent connectivity and robust API services, while also developing responsive, accessible interfaces in React and TypeScript.