Senior Software Engineer

Secure Source; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A cybersecurity firm is seeking a Senior Software Developer to tackle complex security challenges. Collaborating with researchers, you will deliver robust software solutions while reverse-engineering system internals across various platforms like Windows, Linux, Android, and iOS. The ideal candidate is experienced in Python, C, and Rust, with a background in offensive security. Strong mentoring skills and a high-level security clearance are required for this role.

Qualifications

• A seasoned software developer with a strong command of software engineering practices.
• Comfortable approaching novel, highly complex technical problems.
• Experienced in mentoring and supporting junior team members.

Responsibilities

• Deliver robust, well-engineered software solutions in unconventional or constrained environments.
• Reverse-engineer software internals to understand system behaviour.
• Reimplement system components to surface unintended or hidden functionality.
• Perform in-depth exploration of unfamiliar or specialised architectures.

Skills

Proficiency in Python

Experience with C

Experience with Rust

Understanding of assembly

Knowledge of offensive security

Knowledge of red-team tooling

Familiarity with Azure DevOps

Familiarity with Jenkins

Familiarity with GitHub Actions

Job description

Senior Software Developer – Advanced Security & Platform Internals

We are seeking an experienced software developer to collaborate closely with a team of vulnerability researchers, tackling complex technical challenges that have real‑world impact.

Our research group investigates security weaknesses across a wide range of technologies—from mobile devices to automotive systems. In this role, you will build a deep understanding of platforms such as Android, iOS, and Linux from an offensive‑security perspective, developing sophisticated software that interacts with low‑level system components.

Role Responsibilities

• Deliver robust, well‑engineered software solutions in unconventional or constrained environments.
• Reverse‑engineer software internals to understand system behaviour.
• Reimplement system components to surface unintended or hidden functionality.
• Perform in‑depth exploration of unfamiliar or specialised architectures.

Ideal Candidate Profile

• A seasoned software developer with a strong command of software engineering practices and the confidence to optimise or improve existing processes.
• You may currently hold the title of Operational Cyber Developer / ‘Cyber Engineer’ in another organisation
• Comfortable approaching novel, highly complex technical problems.
• Able to thrive within a multidisciplinary environment that includes both researchers and developers.
• Experienced in mentoring and supporting junior team members.

Required Technical Skills

• Proficiency in high‑level languages such as Python.
• Experience with low‑level languages, including C and Rust.
• Understanding of assembly or other low‑level architectural internals.
• Background in building offensive security or red‑team tooling.
• Knowledge of system internals on major platforms (e.g., Windows, Linux, Android, iOS).
• Familiarity with automated build and CI/CD systems such as Azure DevOps, Jenkins, or GitHub Actions.
• Requires Security Clearance to a high level