Senior Software Engineer - GammaLabs

A Bit About Us

At Gamma we provide voice, data, and mobile solutions to businesses across the UK, Germany, Spain, and the Benelux region.

Our people are at the heart of everything we do. When you join us, you’ll be part of a collaborative, forward‑thinking team that’s transforming how businesses connect and communicate globally. We’re growing fast, but we never lose sight of what matters: our people. Whether you're looking to develop your skills, take on new challenges, or make a meaningful impact, Gamma is the place to do it.

As a Senior Software Engineer, you will be responsible for designing, building, and maintaining systems within the BSS/OSS space. This role exists to bring strong technical expertise into the team, ensuring software is robust, scalable, and secure, while contributing to the design and planning of key components within larger platform initiatives. You’ll play a key role in shaping solutions, embedding non‑functional requirements such as performance, maintainability, and security, while supporting the wider engineering team through best practice and technical guidance.

• Leading key aspects of technical design, development, code review, and testing for delivered components
• Supporting and coaching engineers within the team on technologies, standards, and best practices
• Contributing to and enhancing CI/CD pipelines and engineering practices within the squad
• Participating in Agile ceremonies and supporting project delivery and continuous improvement initiatives
• Collaborating with Product, Operations, and other stakeholders to refine and improve requirements
• Ensuring systems meet standards across cost control, security, configuration, and asset management
• Creating clear technical documentation to support maintainability, operability, and business continuity
• Driving quality through robust testing strategies and identifying opportunities to adopt new technologies

• Strong hands‑on experience with Java (Java 8+) and a solid understanding of object‑oriented programming principles
• Experience designing and building RESTful APIs with a focus on scalability and maintainability
• Strong SQL and database design experience, with performance optimisation knowledge
• Experience using version control systems (ideally Git) within collaborative environments
• Knowledge of automated testing frameworks (e.g. JUnit, Cucumber, Selenium) and CI/CD practices
• Experience working in Agile teams and using tools such as Jira
• Familiarity with AWS and cloud‑native development (desirable)
• Understanding of containerisation technologies (e.g. Docker, Kubernetes) (desirable)

• 25 days annual leave + birthday
• Subsidised private medical insurance
• 5.1% matched pension contributions
• Enhanced parental leave
• Life assurance and Income protection
• Share save and incentive plans
• Electric Vehicle and Cycle scheme
• Employee discounts
• Volunteer day

We require all candidates to be eligible to work in the UK and pass a basic DBS check. Unfortunately, we’re unable to offer visa sponsorship or relocation support for this role. This role is hybrid, with a mix of office and home working.

Gamma is an equal‑opportunity employer committed to building diverse, inclusive teams where everyone feels valued and can be their authentic selves. We welcome applicants from all backgrounds, especially those underrepresented in our industry. As a family‑friendly employer, we foster a culture of trust, autonomy, and flexibility to support your work‑life balance and help you thrive at Gamma.