Integrity Software Engineer

Join to apply for the High‑Integrity Software Engineer role at Core Tech Security
.

Our Capability Development team develops bespoke software for clients in the cyber security domain. We specialise in C and C++ and have worked across iOS, Android, Windows, macOS and Linux. We emphasise a comprehensive understanding of the programming languages, platforms, and tooling, and are looking for a candidate who holds an active Developed Vetting security clearance.

• Design a new clean‑slate product with complete autonomy over its architecture.
• Add new capabilities to or replace a core component of an existing product.
• Throw together a quick‑and‑dirty prototype to confirm feasibility, iterating until it meets requirements.
• Hands‑on in day‑to‑day delivery of projects, working with 1–2 colleagues.
• Unlock the potential of junior colleagues: encourage idiomatic code, demonstrate engineering rigour, share knowledge.
• Drive engineering processes to balance code quality, realistic delivery timescales, and client requirements.

• Professional experience designing and implementing complex C or C++ solutions, including clean‑slate and legacy codebases.
• Comfortable with platform APIs, development environments, and native debugging on Windows, macOS, Linux, iOS, or Android.
• Experience leading a small or midsize team through a complete project lifecycle.
• Commitment to code correctness and quality assurance via static analysis, code review, automated testing, and continuous integration.

• Promotions based on technical excellence and reviewed regularly.
• 25 days holiday per year (plus bank holidays), option to buy up to 5 days.
• Additional holiday days after 2 years of service.
• Financial support for HMRC‑allowable relocation costs.
• Training and development opportunities.
• O’Reilly books subscription.
• Regular internal technical conferences, company socials, and lunch seminars.
• Free fruit, tea, coffee, milk, squash, hot chocolate.

• Private online GP and helpline.
• Access to physiotherapists, osteopaths, chiropractors.
• Mental health counselling and specialist consultations.
• Annual health assessment.

• Company bonus scheme tied to company success.
• 8% company pension contribution, no minimum employee contribution.
• Death in service cover of 4x base salary.

• Enhanced maternity/paternity/adoption leave: 12 weeks full pay at start, 20 weeks after 2 years; 2 weeks paternity full pay at start, 4 weeks after 2 years.
• Enhanced cycle‑to‑work scheme; up to £1,000 purchase of e‑bikes and specialist cycles.

Center of Cheltenham, a new build contemporary office, 5 minutes walk from local shops and cafes.

Interview process is quick and to the point: brief call → technical interview. Successful applicants must hold an active Developed Vetting security clearance.