Job Title: Senior Software Engineer Location: London (Hybrid: 2-3 days/week in office) Contract Type: Permanent Salary: up to £100,000(DOE) About the Role We're looking for a skilled and experienced Senior Software Engineer to join a fast-paced, product-focused team building innovative technology that delivers real impact. You'll work across the full development lifecycle-from design and implementation to deployment and monitoring-taking ownership of your work and contributing to a collaborative engineering culture. This is a hands-on role where you'll be empowered to make technical decisions, mentor others, and help shape the future of a platform used by thousands. Key Responsibilities Design, build, release, and monitor software systems end-to-end Collaborate with product, design, and data teams to deliver user-focused features Provide technical leadership and mentorship to other engineers Use data to inform decisions and prioritise development efforts Work flexibly across the stack, with opportunities to specialise or broaden your scopeEssential Experience Proven ability to define and deliver long-term technical direction in ambiguous environments Full-stack development experience, with ownership of technical decisions and outcomes Experience designing and deploying scalable, observable, and maintainable systems Familiarity with microservices architecture (synchronous and asynchronous) Strong experience with NodeJS, TypeScript/JavaScript, and React Good understanding of cloud platforms (AWS, GCP, Azure) Solid grasp of database technologies and trade-offs Experience with automated testing and web security best practices Background in SaaS, ideally B2B2C or consumer-facing techDesirable Experience React Native best practices Native app development (iOS, Android), Expo Event-driven systems and distributed architecture Technologies such as GCP (GKE, PubSub, BigQuery), Temporal, Postgres, CircleCI, ArgoCD, Kubernetes, Helm, Docker, Terraform Experience in zero-to-one product development or highly innovative domainsBenefits Competitive salary 25 days annual leave plus bank holidays Private healthcare and life assurance Dedicated Learning & Innovation time every second Friday Hybrid working with flexible hours Free drinks and snacks in their london office Modis International Ltd acts as an employment agency for permanent recruitment and an employment business for the supply of temporary workers in the UK. Modis Europe Ltd provide a variety of international solutions that connect clients to the best talent in the world. For all positions based in Switzerland, Modis Europe Ltd works with its licensed Swiss partner Accurity GmbH to ensure that candidate applications are handled in accordance with Swiss law. Both Modis International Ltd and Modis Europe Ltd are Equal Opportunities Employers. By applying for this role your details will be submitted to Modis International Ltd and/ or Modis Europe Ltd. Our Candidate Privacy Information Statement which explains how we will use your information is available on the Modis website