Title: Full Stack Developer
Location: Hybrid (Warrington, United Kingdom)
Company: GTMaritime (Valstone Portfolio)
About the Company: GT Maritime provides mission-critical maritime cybersecurity and communications software to 2,000 companies and 16,000 vessels worldwide — roughly a quarter of the world’s non-navy fleet. Based in Warrington, UK, GT Maritime operates as a focused, technically rigorous business with a strong culture of quality and long-term ownership. GT Maritime is part of the Valstone portfolio.
About Valstone: Valstone is an industrial software conglomerate that acquires and operates mission-critical software businesses across agriculture, logistics, food processing, bulk materials, and manufacturing. With 19 acquisitions completed across Canada, the USA, and the UK, Valstone takes a long-term, buy-and-hold approach — building businesses rather than exiting them. Valstone is part of the Valsef Group, a Montreal-based holding company. Sister entities include Valsoft (130+ acquisitions, $3B+ valuation), Permanent Corp, Valnet, and Valsef Capital.
Valstone at a Glance (Part of the Valsef Group)
- 19 acquisitions completed
- 4 core verticals
- Canada, USA and UK operations
- Buy and hold — no exit horizon
- $200M revenue target by 2026
About the Role: Reporting to the Head of Engineering, this Full Stack Developer role sits at the centre of GT Maritime’s next phase of product development. The team is building the next generation of GT Maritime’s platform — the layer where customers see what is happening across their entire fleet.
This hire will design and build partner API integrations across the cybersecurity stack — endpoint protection, network security, user awareness training, and SIEM/SOC tooling — and set the standard for test-driven development across the codebase. This is a hands-on, permanent role. You will not just build to spec — you will model TDD practice for the rest of the team through the code you write every day.
Responsibilities
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