Software Engineer – Application Development
Confirmed on the employer's own hiring board on Nov 12, 2026. First seen by Alion on Nov 10, 2026. Leidos scores B on the Alion truth index.
Software Engineer - Application Development
Location: Bristol, 4-5 days per week on customer site
Clearance: Must be eligible for DV clearance.
We are looking for a Software Engineer Application Developer who is keen to build practical software skills in a secure, mission-focused environment. This role is ideal for someone with a good technical foundation, curiosity, and the motivation to learn from experienced engineers while contributing to real operational systems.
You will gain hands-on experience with Python, Vue, Electron, GitLab CI/CD, Ansible, Terraform/Terragrunt, and supporting technologies such as MongoDB, Elasticsearch, Redis and RabbitMQ. You will also learn good secure coding practice and how software is built, deployed and supported in controlled environments, with occasional opportunities to assist with hardware installation or configuration.
What You’ll Do
- Contribute to the development of application features, fixes, tests and supporting documentation.
- Write and maintain Python code with guidance from senior engineers.
- Help build user interfaces and desktop/web application components using Vue and Electron.
- Use Git and GitLab CI/CD pipelines to build, test and deliver software changes.
- Learn how infrastructure as code is used through tools such as Ansible and Terraform/Terragrunt.
- Support integration with data and messaging technologies including MongoDB, Elasticsearch, Redis and RabbitMQ.
- Follow secure coding guidance, peer review processes and good development practice.
- Assist with testing, troubleshooting, deployment preparation and controlled environment support.
- Occasionally assist with installation, configuration or checking of hardware where required.
- Work closely with senior developers, users and project teams to understand requirements and deliver useful software.
What You’ll Bring
Essential:
- Experience with Python or another programming language and a willingness to develop strong Python skills.
- Understanding of software development basics, such as source control, testing, debugging and documentation.
- Interest in web or desktop application development, including frameworks such as Vue or Electron.
- Awareness of APIs, data handling, Linux environments, automation or deployment concepts.
- Willingness to learn secure coding practice and follow good industry development standards.
- Ability to work carefully, ask questions, take feedback and learn through peer review.
- Good communication skills and the confidence to work with technical and non-technical stakeholders.
Desirable:
- Exposure to GitLab, CI/CD pipelines, deployment automation or infrastructure as code.
- Exposure to MongoDB, Elasticsearch, Redis, RabbitMQ or similar technologies.
- Experience using Linux or MacOS for development or troubleshooting.
- Interest in cyber security, secure software development or working in secure environments.
- Any practical experience with hardware setup, configuration or technical support.
Education and Experience
- Degree, apprenticeship, bootcamp, relevant training or equivalent practical experience in software development or a related technical field.
- Relevant experience, although aptitude, attitude and demonstrable learning are equally important.
- Professional membership, technical certifications or personal projects are welcome but not essential.
Clearance Requirements:
- Clearance to Start: SC
- Clearance for Role DV
What we do for you
At Leidos we are PASSIONATE about customer success, UNITED as a team and INSPIRED to make a difference. We offer meaningful and engaging careers, a collaborative culture, and support for your career goals, all while nurturing a healthy work-life balance.
We provide an employment package that attracts, develops and retains only the best in talent. Our reward scheme includes:
- Contributory Pension Scheme
- Private Medical Insurance
- 33 days Annual Leave (including public and privilege holidays)
- Access to Flexible benefits (including life assurance, health schemes, gym memberships, annual buy and sell holidays and a cycle to work scheme)
- Flexi Time Working
Commitment to Diversity:
We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone. If you have a disability or need any reasonable adjustments during the application and selection stages, please let us know, and we will respond in a way that best fits your needs
Commitment to Diversity
We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone. If you have a disability or need any reasonable adjustments during the application and selection stages please let us know, and we will respond in a way that best fits your needs.
Who We Are
Leidos UK & EUROPE - we work to make the world safer, healthier, and more efficient through technology, engineering and science.
Leidos is a growing company delivering innovative technology and solutions focused on safeguarding critical capabilities and transformation in frontline services, our work in the United Kingdom includes addressing some of the most complex problems in defence, healthcare, government, safety and security, and transportation.
What Makes Us Different:
Purpose: you can use your passion and abilities at Leidos to keep the people you care about safe. We are at the forefront of machine learning, AI, cyber security and solutions. Using your skills in the technology frontline by helping to build a safer world. You can inspire change.
Collaboration: having flexibility to do your job is one of our core benefits, enabling you to become part of our extraordinary team. We have been empowering our people to work flexibly for years. Whether you work from home, the office or on customer sites, we will give you the digital tools and the flexibility to work smarter and align your needs and ours.
People: Leidos empowers people from every background to be themselves and gives you the tools to learn new skills by enabling growth whilst developing. We believe that extraordinary people need opportunities to grow, to be inspired and to inspire others. At Leidos, we invest in technical academies, career rotations and a career development plans that enhance your future.
If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.
Original Posting:
For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
Pay Range:
£47,600.00-£61,000.00The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.