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Senior Full Stack Developer || UK || Contract - Remote || £400/day || Outside IR35 ||

9NEXUSUnited Kingdom
£832k · statedRemote · UKMid-Senior Level

Skills

  • PYTHON
  • FASTAPI
  • TYPESCRIPT
  • REACT
  • NEXT.JS
  • REST API
  • OPENAPI
  • PYDANTIC
  • SSO
  • OAUTH
  • EVENT-DRIVEN ARCHITECTURE
  • PUB/SUB

About the role

Role Overview

We are looking for a hands-on Senior Fullstack Developer to build and deliver production-ready features across Next.js/React frontends, Python APIs, event-driven services, and GCP. The role combines frontend engineering, backend development, automation, data integration, and GenAI capabilities, with end-to-end ownership from design and implementation to testing, deployment, and production support.

Key Responsibilities

  • Develop scalable frontend applications using React, Next.js, TypeScript, MUI, and TanStack Query.
  • Build and maintain Python APIs using FastAPI or similar frameworks, following REST, OpenAPI, and Pydantic standards.
  • Design event-driven workflows using Pub/Sub or similar messaging systems, asynchronous workers, retries, and real-time updates through SSE/WebSockets.
  • Integrate GenAI/agentic workflows using Google ADK, LangChain, or similar frameworks, including streaming agent responses to the UI.
  • Design and manage SQL databases, data models, migrations, and integrations with BigQuery and object storage.
  • Deploy and operate services on GCP, including Cloud Run, IAM, secrets management, and secure network configurations.
  • Implement automated testing using pytest and Playwright, alongside CI/CD pipelines and infrastructure as code using GitHub Actions and Terraform.
  • Establish observability through logging, metrics, tracing, alerting, and frontend monitoring.
  • Build data visualisations, dashboards, and 3D visualisation features where required.
  • Own features end to end, troubleshoot production issues, establish engineering standards, and collaborate with engineers, scientists, and business stakeholders.

Mandatory Skills

  • Strong Python, FastAPI, TypeScript, React, and Next.js.
  • REST API design, OpenAPI, Pydantic, and enterprise integrations using SSO/OAuth.
  • Event-driven architecture, messaging systems, asynchronous processing, and real-time communication.
  • GCP services, secure cloud deployments, SQL databases, and data modelling.
  • Automated testing with pytest/Playwright, CI/CD, Terraform, and observability practices.
  • Strong problem-solving, communication, and end-to-end delivery ownership.

Good to Have

  • BigQuery, data contracts, data governance, and cost-optimised data querying.
  • GenAI agents using Google ADK or LangChain.
  • MUI, TanStack Query, advanced dashboards, charts, and 3D visualisation.
  • Experience with distributed systems, object storage (GCS/S3), and production monitoring.


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