Sr. Software Engineer, Fullstack (UK)
This is the employer's own posting, not a copy on a job board.
What we know
Is it still open?
Confirmed still open
Last checked 2d ago — checked against the employer's own applicant tracking system, which is the company answering directly.
We re-read the employer's own applicant tracking system and the posting was still there. That is the company answering directly.
How old is it?
Posted 117d ago
The date the source published, not the day we noticed it (2026-05-20). Last seen at its source 1h ago.
Is it remote?
Remote - UK
That is the location the employer filed this posting under. Quoted as written — we do not re-word the source's own location.
Who may apply?
United Kingdom
The description states no restriction of its own. This is the source's own tag.
Pay not stated
Similar roles pay £75k–101.3k/yr
Middle 50% of 20 listings that do state pay — Engineering · Senior · United Kingdom · GBP/year. This employer has published no salary; this is what comparable listings we hold disclose, never converted between currencies or periods. How this is calculated.
Skills named in the ad
Recognised terms only, from a fixed vocabulary — this is what CV matching compares against.
Carried by 1 source
-
lever employer's own board first seen 24d ago · last seen 1h ago
The listing
Responsibilities
Design, build, and maintain public-facing APIs and Agentic tools that enable enterprise customers to integrate with and extend the Firstup platform.
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 wider engineering organisation.
Write high-quality code (reliable, readable, efficient, testable, scalable, maintainable), provide thorough code reviews, and create comprehensive tests and documentation.
Apply broad, in-depth knowledge to develop and maintain large-scale multi-tenant services in the cloud.
Actively use Generative AI tools and coding agents in day-to-day workflows to improve code quality and accelerate delivery.
Collaborate across teams on industry standards and best practices to help others solve complex problems.
Design future-ready solutions and address architectural gaps using modern microservices and cloud-native patterns.
Own production health for your services, contributing to on-call rotations, incident response, and post-incident reviews in a "you build it, you run it" environment.
Identify, analyse, and resolve system availability, reliability, and performance issues, contributing to observability and resiliency improvements.
Partner with Product Management and Design to translate business requirements into scalable technical solutions.
Minimum Qualifications
Bachelor's degree in Computer Science or related field, or equivalent experience.
5+ years building reliable, performant applications and microservices.
Strong proficiency in TypeScript and Node.js. Ruby experience is a plus.
Proven full-stack experience across frontend (React.js), backend, and database layers.
Technical depth in at least one specialisation: networking, security, serverless, event streams, or similar.
Strong AWS experience, including compute, storage, networking, and monitoring.
Excitement to build beautiful, intuitive products with a strong customer focus.
Innate curiosity and a desire to learn and teach.
Preferred Qualifications:
Experience building and maintaining integrations with HRIS platforms such as Workday, SAP SuccessFactors, Dayforce, or similar enterprise HR systems.
Experience with Kubernetes, Docker, and Helm.
Experience with Datadog or similar observability and monitoring platforms.
Demonstrated use of Generative AI tools or coding agents in development workflows.
Experience in enterprise SaaS organisations, particularly HR Tech or regulated domains.
Familiarity with ML/AI integration in production systems.
Open-source contributions or a history of side projects.