Senior Cyber Software Engineer Technical Lead

Hackajob Ltd; Leeds; On-site; GBP 90,000 - 110,000; Full time

Benefits offered by this job

Lifelong learning

Hybrid/work flexibility

On-site in London

Job summary

BAE Systems Digital Intelligence in London (Southwark) seeks a Senior Cyber Software Engineer / Technical Lead to design, develop and test high‑assurance software for national security clients.

You will lead technical tasks, mentor teammates, and collaborate across disciplines. On-site five days a week with hybrid options depending on the role, with a strong focus on secure coding and continuous learning.

Qualifications

• Experience in software engineering with a cybersecurity focus.
• Familiarity with IDEs, debuggers, source control, unit testing, mocking, CI and TDD.
• Knowledge of high-assurance development and IT security importance for organisations.
• Proficiency in at least one solution language (C++, Java, or C#) and one scripting language (Python, JavaScript, Perl, or PowerShell).
• Ability to work across multiple operating systems and learn new languages quickly.
• Strong communication and mentoring capabilities are essential.
• Eligible for Baseline Personnel Security Standard and UK security clearance (eDV).
• UK residency 5–10 years may be required depending on vetting.

Responsibilities

• Design, develop, test and document high-assurance software for national security customers.
• Deliver solutions using secure development practices and CI pipelines.
• Lead peer reviews and mentor junior team members.
• Collaborate across teams to address security and operational constraints.
• Identify design flaws and recommend mitigations.
• Contribute to Operational Cyber Group initiatives and capabilities.
• Support mission-critical capabilities for national security projects.

Skills

Software engineering

Cybersecurity

High-assurance development

Mentoring

Communication

Learning new languages

Tools

C++

Java

C#

Python

JavaScript

PowerShell

Source control

CI/CD

Unit testing

Job description

Salary: £100,000 - 100,000 per year

Requirements

• We are looking for experience in software engineering, with a strong interest in cybersecurity and high-assurance development.
• We need familiarity with a range of development tools and techniques, including IDEs, debuggers, source control, unit testing, mocking, continuous integration, and test-driven development.
• We are looking for knowledge of high-assurance development principles and an awareness of the importance of IT security for companies and governments.
• We need an intermediate to advanced understanding of computing principles, such as stack and heap distinctions and compiled versus interpreted languages.
• We need proficiency in at least one solution language, such as C++, Java, or C#, and one utility language, such as Python, JavaScript, Perl, or PowerShell.
• We are looking for the ability to use and configure more than one major operating system.
• We need the ability to learn new languages and technologies quickly.
• We need strong communication skills, including the ability to discuss technical topics with both technical and non-technical audiences.
• We value experience mentoring others and/or leading technical tasks.
• We require candidates to be able to achieve Baseline Personnel Security Standard and, for this role, successfully obtain eDV UK security clearance.
• Some roles may require 5 to 10 years of continuous UK residency, depending on vetting level.

Responsibilities

• We design, develop, test, and document software to meet customer requirements and business and industry best practices.
• We deliver solutions using a range of development methodologies, while factoring operational security into system design, development, and testing.
• We work in teams to deliver high-assurance code and carry out constructive peer review and knowledge sharing with junior team members.
• We leverage continuous integration where appropriate.
• We embrace emerging technology, tools, and language trends while identifying the risks they may present.
• We identify flaws during solution design and implementation and recommend mitigations.
• We contribute to an Operational Cyber Group focused on high-assurance development, research, reverse engineering, and vulnerability research.
• We support mission-changing capability for national security customers across a wide variety of platforms and technologies.

Technologies

• C#
• Support
• Java
• JavaScript
• Perl
• PowerShell
• Python
• Security
• Network

More

We are BAE Systems Digital Intelligence, home to 4,500 digital, cyber and intelligence experts working collaboratively across 10 countries to help governments, nation states, armed forces, and commercial businesses unlock digital advantage in demanding environments. This Senior Cyber Software Engineer/Technical Lead role is based in London (Southwark) and requires 5 days per week on site, with flexible and hybrid working arrangements available depending on the role. We offer lifelong learning, meaningful work, tailored rewards, and a supportive, inclusive culture where people can grow their careers with confidence and contribute to a safer future. Our Operational Cyber Group is part of our Capabilities division, a key engineering, consulting, and project management function focused on national security and digital transformation. We welcome diverse perspectives and are committed to an inclusive workplace where everyone can thrive.

last updated 40 week of 2026