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# Senior Software Engineer

- **Company:** Growthwork
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Cyber Security, Python (Programming Language), Software Engineering, Golang
- **Published:** September 18, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-software-engineer/47473920

## About the Role

Senior Software Engineer | Series A Cybersecurity Start-Up | LondonSenior Software Engineer required to join a fast-growing Series A cybersecurity start-up in London, tackling some of the most difficult problems in modern security. The company has been built by experienced founders with a proven track record of building and scaling successful cybersecurity businesses. With strong backing, growing traction, and an exceptional engineering team already in place, they're now entering the next phase of growth. This is the sweet spot for joining a start-up: early enough to have real influence, but with the backing, team, and momentum already behind it.You are:5+ years of professional Software Engineering experienceStrong in one or more of Python, Go, Java, or C#An excellent engineer with strong system design and software engineering fundamentalsComfortable owning complex technical problems from architecture through to productionA builder who enjoys moving quickly and taking responsibility
for outcomesSomeone who wants genuine influence rather than being one engineer amongst hundredsBonus points:Previous start-up or scale-up experienceExperience across cybersecurity, cloud, infrastructure, or distributed systemsWhy join?Join a Series A start-up at a pivotal stage of growthWork alongside experienced founders with a successful track record in cybersecurityJoin a small, world-class engineering team solving genuinely difficult technical problemsHave significant influence over architecture, product, and technical directionBuild technology addressing critical real-world cybersecurity challengesCompetitive salary + meaningful equityIf you're a strong Software Engineer who wants the technical challenge of a start-up, genuine ownership, and the opportunity to help shape a company as it scales,Senior Software Engineer | Series A Cybersecurity Start-Up | London #J-18808-Ljbffr



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