IT & Software

Sr. Software Engineer, Fullstack (UK)

Firstup

London · Greater London · United Kingdom

Overview

In this role, you will design and deliver large-scale, multi-tenant cloud services with a focus on availability, fault-tolerance, and clean architecture. You will set engineering quality standards and mentor peers within a collaborative product-engineering environment. You’ll own end-to-end SaaS applications and drive performance, reliability, and testability across stacks. You’ll pair with Product and Design to translate requirements into intuitive UIs while embracing AI-assisted tooling to accelerate development. This is an opportunity to shape scalable systems in a fast-moving, inclusive company.

Pay / Benefits
  • excellent PTO program
  • great health benefits
  • remote work
  • casual and friendly environment
  • leadership investment in growth
  • inclusive environment
Responsibilities
  • Build and own scalable SaaS applications end-to-end (frontend, backend, data layers)
  • Design future-ready architectures and address gaps proactively
  • Improve system availability and performance; investigate and resolve reliability issues
  • Promote shift-left quality with rigorous testing (unit, integration, contract)
  • Leverage AI-assisted tools to accelerate development while maintaining code quality
  • Provide technical leadership through code reviews and mentoring
  • Collaborate with Product and Design to translate requirements into intuitive UI
  • Champion engineering best practices across teams and solve high-impact problems
Key requirements
  • 8+ years building reliable, performant applications and microservices in production
  • Proven full stack fluency across frontend, backend, and database layers
  • Polyglot mindset with familiarity in Ruby on Rails, TypeScript, Node.js, Go, or React.js
  • Experience with production health, on-call rotations and incident response
  • Deep technical depth in distributed systems, multi-tenant SaaS, databases, security, or similar
  • Customer-focused mindset with strong communication and collaboration skills
  • strong communication
  • collaboration across teams
  • curiosity and willingness to teach others
  • Ruby on Rails
  • TypeScript
  • Node.js

Reference: WJ-747_31227124

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