Lead Software Engineer

At Gamma, we're more than just a leader in Unified Communications as a Service (UCaaS). We're a fast-moving technology organisation delivering innovative voice, data, and mobile solutions across Europe. Our product and service portfolio is at the heart of what we do - powering reliable, scalable communications for thousands of businesses. Behind the scenes, our engineering teams design, build, and maintain the software systems that generate real business impact. We combine the agility of a start-up mindset with the stability of a leading European business. Collaboration, ownership, and continuous improvement define how we work - and we're always looking for people who want to build meaningful technology at scale. Who are we looking for? Lead Software Engineers are responsible for developing and maintaining the Group Products suite of proprietary OSS/BSS and UCaaS & CCaaS solutions, including building new features and functionality across the platform and web/desktop user interfaces. They focus on technically challenging work and may move between squads where their deeper expertise is needed. Apply advanced technical skills such as performance tuning, site reliability engineering and complex debugging to ensure the stability, scalability, security, and performance of the platform. What will you be doing day-to-day?

• Collaborate with product and engineering peers to scope, plan and estimate complex requirements, ensuring all solutions are well thought through and future proof.
• Actively suggest coding and process improvements, considering latest industry trends and best practice.
• Take a leading role in technically challenging development work across the platform and applications, whilst maintaining the stability of existing codebase, using TypeScript, Node.js and React.
• Evaluate and integrate relevant third-party services and tools where required, ensuring best practice integration rules are adhered to and integrations are stable and performant.
• Develop REST APIs using best practice standards and conventions, with attention to performance, reliability, security, and scalability.
• Produce comprehensive Solution Design documents for review before implementation including detail on security considerations, testing required, performance implications and potential impacts across the stack. Review Solution Design documents and provide constructive feedback for other members of the team.
• Use JavaScript unit and end to end test frameworks to ensure a high level of coverage across the platform and applications.
• Take an active role in peer code reviews and code deployment via CI/CD pipelines. Mentor engineers across the team on best practice and coding standards.
• Apply site reliability engineering practices to improve system observability, resilience and incident response.
• Perform performance profiling, optimisation and capacity planning to ensure applications meet SLAs.

• Strong experience using, and deep working knowledge of TypeScript (6+ years)
• Extensive experience developing applications using frontend frameworks, such as React, Angular
• Strong knowledge of HTML/CSS (6+ years)
• Strong experience using JavaScript unit & E2E test frameworks (e.g. Jest, Playwright)
• Experience deploying code using CI/CD pipelines.
• Experience mentoring engineers at various levels.
• Strong experience running large production services in AWS
• Strong production experience of containerisation and Kubernetes.
• VoIP/WebRTC experience (Not required but highly beneficial)
• Experience implementing logging, monitoring and observability solutions.
• Strong knowledge of design patterns and software architecture principles.
• Strong production experience of working with SQL and non-SQL databases.
• Proven ability to diagnose and resolve complex performance issues using profiling and analysis tools.
• Experience with site reliability engineering practices including incident response, post-mortems and SLA management.

What do we offer you? At Gamma, we believe in work-life balance, which is why we offer 25 days of annual leave, plus an extra day off for your birthday. We also provide a volunteer day, allowing you to support a cause that matters to you. Family is important to us. With enhanced maternity and paternity pay, we support you at every stage of life. Our contributory pension scheme helps you plan for the future, with Gamma increasing contributions in line with yours. Your wellbeing comes first. We offer group income protection, life assurance (four times your salary), and private medical insurance through Vitality, which extends to your immediate family. We want you to share in our success, which is why we offer tax-efficient share save and share incentive plans. We're also committed to sustainability, offering an Electric Vehicle scheme through Octopus and a Cycle to Work scheme, making greener travel easier. A few things to note Unfortunately, we can't offer visa sponsorship or relocation support for this role. This role is hybrid, with office and home working flexibility. If you feel you could be a great fit for Gamma but don't meet every requirement, we still encourage you to apply - you might be exactly who we're looking for. Gamma is an equal opportunity employer. We are committed to building inclusive, diverse teams where everyone can be their authentic selves. We welcome applications from all backgrounds and do not discriminate based on any protected characteristics. Recruitment agencies: We work with a trusted group of recruitment partners and are not looking to expand this network at present. Please do not send speculative CVs.