Salary: £100,000 - 100,000 per year Requirements: Proficiency in TypeScript and Node.js for backend APIs Experience with cloud platforms such as AWS or GCP Familiarity with streaming systems (Flink, Kafka, Kinesis, Spark, etc.) Strong understanding of software practices like TDD, CI/CD, IaC, and Observability Proven experience in system design and full product lifecycle management Responsibilities: Lead the architecture and standards of the software solutions Oversee the hiring of a software engineering team Shape the culture and product direction from day one Work across the full tech stack on builds, testing, deployment, and production support Collaborate directly with the CTO to scale the company Technologies: AWS Backend CI/CD Cloud CTO Flink GCP Support Kafka Spark TDD TypeScript NodeJS JavaScript More: We are a tech start-up dedicated to improving the mental health and wellbeing of millions, and we are looking for a Senior Software Engineer to join us as our first software engineering hire. This role offers a unique opportunity to build something entirely new in a well-funded environment. We provide real ownership in an early-stage start-up, competitive compensation up to £100k, 30 days of annual leave plus bank holidays, and remote-first working with one day per month in London. Join us and make a tangible impact in the world. last updated 9 week of 2026