Senior Software Engineer – Full Stack

Leidos

Senior Software Engineer developing solutions and enhancing software for Leidos. Engaging in full-stack development with Java, React, and contribution to Agile practices.

Posted 7/21/2026full-timeFarnborough • 🇬🇧 United KingdomSenior💰 £61,500 - £78,800 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack software development, particularly in Java, React, and TypeScript, while adhering to Agile methodologies and best practices in code quality and testing. Capable of mentoring peers and ensuring effective collaboration within development teams.

Highest-signal resume keywords

Java DevelopmentREST API DesignReact DevelopmentUnit TestingAgile Methodologies

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Hard Skills

Java 8Java 17Java 21REST APISingle-Page Application DevelopmentDesign PatternsUnit TestingIntegration TestingCI/CD PipelinesTest Automation

Soft Skills

Effective CommunicationMentoringCollaboration

Tools & Technologies

Atlassian Tool SuiteJiraBitbucketBamboo

Industry Keywords

Software Development StrategyCode Review StandardsQuality GatesSecurity ScanningIterative Delivery

Tech Stack

Tools & technologies

AngularJavaReactTypeScriptVue.js

About the role

Key responsibilities & impact

Deliver high‑quality, production‑ready software through hands‑on development, spanning both backend and front‑end technologies.
Develop, debug, test, document, and deploy software enhancements aligned with the Software Development Strategy.
Contribute to full‑stack delivery, including: Backend services and REST APIs implemented in Java
Modern single‑page applications implemented using React/TypeScript or equivalent frameworks.
Make technical decisions within assigned scope, aligning with agreed architectural direction and escalating broader decisions where appropriate.
Apply strong software engineering practices to ensure solutions are clean, maintainable, well‑documented, and fit for long‑term operation.
Ensure adherence to established code review standards and quality gates for all changes delivered within the project.
Continuously validate and maintain the build and deployment pipeline for their own changes: Make updates as necessary to ensure changes do not break the pipeline.
Act as a guide for other developers to ensure pipeline practices are understood and maintained.
Write and maintain unit tests and integration tests as a standard part of development.
Support and contribute to test automation efforts, working closely with the test team (who retain ownership of overall automation outcomes).
Collaborate closely with other engineers, architects, and testers to ensure new and modified software is fully verified prior to promotion.
Support Agile delivery practices, including planning, estimation, backlog refinement, and iterative delivery.
Use and support development tooling and processes, including CI/CD pipelines and integrated security scanning.
Mentor and support less experienced engineers through technical guidance, code reviews, and informal coaching.
Communicate effectively with peers and stakeholders on technical matters, providing clear and well‑reasoned input.

Requirements

What you’ll need

Software engineering experience, including substantial hands‑on delivery using: Java (Java 8 and modern Java versions such as 17 and 21)
REST API design and implementation
Modern SPA development experience (required) using React and TypeScript, Angular, or Vue.
Strong understanding of design patterns and a solid, structured approach to software development.
Proven experience delivering complex changes in production environments.
Demonstrated experience writing unit and integration tests as a normal part of delivery.
Familiarity with Agile software development processes and working within iterative delivery models.
Familiarity with the Atlassian tool suite (e.g. Jira, Bitbucket, Bamboo), or equivalent tooling, with a solid understanding of CI/CD concepts, workflows, and practices.
Experience working with code review standards, quality gates, CI/CD pipelines, and security scanning processes.

Benefits

Comp & perks

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