Job Title: Principal Software Engineer & DevOps Lead Location: London (WC1V) – Hybrid (2–3 days/week in Holborn office) Type: Permanent or Contract Start Date: ASAP IR35 Status: Inside IR35 (contract via umbrella only) Right to Work: Candidates must have full UK working rights – no visa sponsorship Job Description: Join a mission-driven technology company building data-driven platforms for global sustainability and ESG initiatives. As the Principal Software Engineer & DevOps Lead, you'll own the technical roadmap and lead a growing engineering team in designing scalable, cloud-native systems hosted on AWS. This is a hands-on leadership role focused on architecture, DevOps, full-stack engineering, and agile delivery within a high-impact SaaS environment. Key Responsibilities: • Lead the design, architecture, and scaling of the core SaaS platform, hosted on AWS • Manage full DevOps lifecycle – AWS (Lambda, EC2, RDS, DynamoDB, S3, Amplify), CI/CD pipelines (GitHub Actions, Jenkins), and infrastructure as code (Terraform) • Shape microservices and serverless architecture using Docker, Kubernetes, and containerization best practices • Guide backend (Python, Node.js) and frontend (React, TypeScript) development • Mentor and manage a cross-functional team of engineers; drive hiring and technical excellence • Collaborate with Product and Senior Leadership on AI-powered features, automated analytics, and data engineering • Champion agile methodology – sprint planning, retrospectives, and continuous delivery Ideal Candidate Profile: • 6+ years of software engineering experience, with a track record of technical leadership and architecture ownership • Expert knowledge of AWS services including Lambda, RDS, DynamoDB, EC2, S3, and Amplify • Proficient in backend technologies: Python and Node.js • Solid experience in frontend frameworks: React and TypeScript • Skilled in CI/CD automation using GitHub Actions, Jenkins, and Terraform • Strong understanding of Docker, Kubernetes, and serverless deployments • Experience in agile software development environments (Scrum, Jira) • Confident team leader with high ownership, strategic thinking, and communication skills Preferred (Nice-to-Have): • Experience in building or scaling SaaS platforms • Background in sustainability, ESG, or environmental data software • Familiarity with AI/ML readiness, analytics pipelines, or data engineering • Exposure to database schema design and big data strategy What You’ll Get: • Opportunity to shape architecture and technology strategy for a mission-aligned platform • Lead a growing engineering team in a high-autonomy environment • Hybrid working (London-based), private healthcare, pension scheme, cycle-to-work • Work on meaningful, purpose-led software that supports the transition to a more sustainable economy AWS Lambda, DevOps Lead, Principal Software Engineer, Technical Lead, Software Architect, SaaS, ESG, Python Developer, Node.js Developer, React Developer, TypeScript, GitHub Actions, Jenkins, Terraform, Docker, Kubernetes, Serverless, Agile, CI/CD, Cloud Architecture, Data Engineering, Full-Stack Developer, Sustainability Tech, AI/ML Platform