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Firstup

Senior Software Engineer, Fullstack

Firstup

. Join the team responsible for Firstup's public APIs, Agentic tools, third-party integrations with enterprise systems such as HRIS platforms.

Posted 5/16/2026full-timeRemote • 🇬🇧 United KingdomSeniorWebsite

Tech Stack

Tools & technologies
Distributed SystemsJavaScriptMicroservicesNode.jsReactRubyRuby on RailsTypeScript

About the role

Key responsibilities & impact
  • Join the team responsible for Firstup's public APIs, Agentic tools, third-party integrations with enterprise systems such as HRIS platforms.
  • Deliver innovative, scalable solutions while improving architecture, scale, availability, and fault-tolerance.
  • Actively use Generative AI tools and coding agents to accelerate delivery and improve code quality.

Requirements

What you’ll need
  • Bachelor's degree in Computer Science or related field, or equivalent experience.
  • 5+ years building reliable, performant applications and microservices in production environments. Proven full stack fluency.
  • A polyglot mindset — familiarity with Ruby on Rails, TypeScript, Node.js, or React.js is a strong plus.
  • Technical depth in at least one engineering domain: distributed systems, multi-tenant SaaS, application databases, networking, security, serverless, event streaming, or similar.
  • A genuine drive to build beautiful, intuitive products with the customer always in focus. Strong communication skills and openness to collaborative idea-sharing across teams.

Benefits

Comp & perks
  • excellent PTO program
  • great health benefits
  • casual and friendly environment
  • remote work
  • leadership team believes in your growth

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
Ruby on RailsTypeScriptNode.jsReact.jsmicroservicesdistributed systemsmulti-tenant SaaSapplication databasesnetworkingsecurity
Soft Skills
communicationcollaborationcustomer focusproblem-solvinginnovation
Certifications
Bachelor's degree in Computer Science