Sr. Software Engineer, Fullstack (UK)
Core
Build and own scalable SaaS applications end-to-end (frontend, backend, data) for Firstup's public APIs, Agentic tools, and third-party integrations with enterprise HRIS platforms.
Role type
Senior Fullstack Software Engineer
Builds
Scalable SaaS applications, public APIs, Agentic tools, third-party integrations
Domain
Enterprise workforce communication technology
Deliverable
production ML models
Required skills
Full-stack fluency, microservices architecture, distributed systems, database design, system reliability, shift-left testing, AI-assisted development, code review, mentorship
Preferred skills
Ruby on Rails, TypeScript, Node.js, Go, React.js
Technologies
Ruby on Rails, TypeScript, Node.js, Go, React.js
Responsibilities
Design future-ready architectures, drive system availability and performance, champion shift-left quality culture, leverage AI tools for development, mentor engineers, partner with Product and Design
Seniority
Senior, hands-on IC