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Senior Full Stack Engineer

Salary £70k to £80k + Bonus and excellent pension/ benefits

Location: Central London

About the client

Our client is an infrastructure communications technology company providing end-to-end fibre solutions and now Cloud solutions, Wi-Fi, Firewalls/Security, SD WAN, Managed LAN and UC services for businesses and wholesale/carrier/channel organisations across London.

What you will do:

We are looking for a Senior Full Stack Engineer to own end-to-end delivery of critical features, drive architectural excellence, and establish best practices. You’ll work hands-on across React, Node.js, and Python services, own our CI/CD and DevOps processes, integrate with network-centric systems, and mentor the wider engineering team as we grow.

‍Key responsibilities:

* Architect, build & implement scalable features in our React frontend and Node.js / Python backend (FastAPI, Celery)

* Design integrations with network devices, IPAM, monitoring platforms, Wi-Fi authentication

* systems, CRMs and partnered PropTech tools

* Continually hone and perfect our homegrown DevOps and CI/CD processes by further developing GitHub Actions pipelines, Terraform definitions and observability integrations.

* Ensure quality & reliability: establish testing best practices (unit, integration, end-to-end), conduct code reviews and demand high quality standards

* Shape and refine our cloud-native platform to optimise performance, security and scalability

* Mentor & lead intermediate developers, imparting knowledge and fostering a culture of clean code, peer review and shared ownership.

* Collaborate cross-functionally with product, operations and customer success to translate requirements into robust technical solutions.

A good fit candidate will have:

* 5+ years hands-on as a full stack engineer in a SaaS environment

* Expert in React (hooks, state management, performance)

* Strong backend skills in Node.js (Express) and Python (FastAPI, Celery)

* Deep familiarity with Microsoft Azure (App Services, Functions, networking)

* Proven experience working with network-focused systems (SNMP, IPAM, CLI automation)

* Solid understanding of Auth0 (or similar OAuth/OIDC) and secure authentication flows.

* Skilled with GitHub and GitHub Actions for automated CI/CD.

* Experience with infrastructure as code (ARM templates, Terraform, Bicep).

* Comfortable writing and maintaining tests (unit, integration, e2e).

* Excellent communication, problem-solving skills and ability to thrive in a fast-paced startup.

Desirable Experience:

* Background in network engineering or close collaboration with network operations teams.

* Experience building platform integrations and/or asynchronous automation systems.

* Open-source contributions in related domains.

* You’ve worked at an early-stage startup before and understand what “hands-on” really means