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Sr. Software Engineer, Fullstack (UK)

3 weeks ago
United Kingdom
Full-time
Senior
Software Engineer
Software Development
AWS Datadog Docker Generative AI Helm Kubernetes Microservices Node.js React Ruby Serverless TypeScript
Apply Now
Firstup

Firstup

Firstup offers an intelligent communication platform designed to engage employees throughout their entire employment journey, providing insights that help organizations support, promote, and retain their workforce effectively.

Professional Services
251-1K
Founded 2008
$47M raised
View All Jobs 12

Description

  • Design, build, and maintain public-facing APIs and Agentic tools for enterprise customer integrations.
  • Develop and own integrations with external enterprise systems, including HRIS platforms such as Workday, SAP SuccessFactors, and Dayforce.
  • Build and maintain shared platform services used across the engineering organisation.
  • Write reliable, readable, efficient, testable, scalable, and maintainable code.
  • Provide thorough code reviews and create comprehensive tests and documentation.
  • Develop and maintain large-scale multi-tenant cloud services.
  • Use Generative AI tools and coding agents in day-to-day workflows to improve code quality and delivery speed.
  • Collaborate across teams on industry standards and best practices.
  • Design future-ready solutions using modern microservices and cloud-native patterns.
  • Own production health for your services, including on-call support, incident response, and post-incident reviews.
  • Identify, analyse, and resolve availability, reliability, and performance issues, while improving observability and resiliency.
  • Partner with Product Management and Design to translate business requirements into scalable technical solutions.

Requirements

  • Bachelor's degree in Computer Science or a related field, or equivalent experience.
  • 5+ years of experience building reliable, performant applications and microservices.
  • Strong proficiency in TypeScript and Node.js.
  • Full-stack experience across frontend (React.js), backend, and database layers.
  • Technical depth in at least one specialisation such as networking, security, serverless, or event streams.
  • Strong AWS experience, including compute, storage, networking, and monitoring.
  • Ruby experience is a plus.
  • Experience building and maintaining integrations with HRIS platforms such as Workday, SAP SuccessFactors, Dayforce, or similar enterprise HR systems (preferred).
  • Experience with Kubernetes, Docker, and Helm (preferred).
  • Experience with Datadog or similar observability and monitoring platforms (preferred).
  • Demonstrated use of Generative AI tools or coding agents in development workflows (preferred).
  • Experience in enterprise SaaS organisations, particularly HR Tech or regulated domains (preferred).
  • Familiarity with ML/AI integration in production systems (preferred).
  • Open-source contributions or a history of side projects (preferred).

Benefits

  • Excellent PTO program.
  • Great health benefits.
  • Remote work.
  • Casual and friendly work environment.
  • Leadership team focused on personal and professional growth.
  • Inclusive, high-growth environment where ideas are rewarded.
  • Opportunity to work on a mission-driven product that improves the employee experience.

Interested in this position?

Apply directly on the company website

Apply Now

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