Principal Software Engineer

18 hours ago


City Of London, United Kingdom Monolith Full time

Join to apply for the Principal Software Engineer role at Monolith We're seeking a Principal Software Engineer to lead the architectural evolution of our platform as we scale to meet growing demand from the world's largest engineering companies. This is a hands‑on technical leadership role where you'll drive critical architectural initiatives while mentoring our engineering team. Key Responsibilities Own technical decisions balancing immediate business needs with long‑term architectural goals Drive the ongoing transition from monolithic to distributed architecture Design and implement architecture to be AI‑agentic ready, enabling rapid deployment of AI products and MCP server integrations Build and optimize distributed compute services Implement reliable workflow orchestration patterns Mentor mid‑level developers, establishing engineering best practices and architectural patterns Collaborate with product and business stakeholders to translate requirements into technical solutions Guide technical decision‑making and prioritization across the engineering organization Interview and onboard new engineers Technical Requirements – Must‑Have 12+ years of software engineering experience with at least 2 years in principal/staff engineering roles Expert‑level Python development skills with production experience at scale Deep expertise in distributed systems architecture Strong Kubernetes experience with production workloads Hands‑on experience with workflow orchestration tools (Temporal, Airflow, or similar) Cloud platform expertise (AWS required, Azure beneficial) Experience with data processing frameworks (Spark, Athena, or similar) Proven track record of leading architectural transformations in growing companies Excellence in technical communication and stakeholder management Experience with systems having ML Engineering and ML Ops aspects What We’re Looking For Technical Excellence: Clean, maintainable code and scalable system design Pragmatic Problem‑Solver: Balance short‑term delivery with long‑term goals Strong Leadership: Proactively identify problems and drive solutions Mentorship Mindset: Share knowledge and guide others Ownership Mentality: Take full responsibility for outcomes Customer Obsession: Deliver value to our customers Referrals increase your chances of interviewing at Monolith by 2x Get notified about new Principal Software Engineer jobs in London, England, United Kingdom. #J-18808-Ljbffr



  • London, United Kingdom Software Development & Engineering Full time

    🔥 Principal Software Engineer - Lead the Future of UK GovTech Innovation💰 Up to £100,000 + Premium Benefits Package 🏡 Remote-First | Just 1 Day Onsite Every 2 Weeks 🔐 SC Clearable | British Citizens Only 🚀 Where Technology Meets Purpose Are you ready to lead engineering efforts that directly impact national security, public services, and...


  • City Of London, United Kingdom Premier Group Full time

    OverviewI'm working with a software company that's looking for a Principal Software Engineer to join their team. They have developed a product that utilises data analytics and machine learning to optimise inventory data, built primarily on Java. This is a key role where you'll take ownership of the technical roadmap and manage solutions architecture, acting...


  • City Of London, England, United Kingdom Fruition Group Full time £1,140,000 - £1,440,000 per year

    Principal Software EngineerLocation: London - 1x a monthSalary: £95,000 - £120,000 + equity + benefitsAn established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects...


  • City Of London, United Kingdom Perforce Software Full time

    Principal Professional Services EngineerJoin to apply for the Principal Professional Services Engineer role at Perforce SoftwarePerforce is a community of collaborative experts, problem solvers, and possibility seekers who believe work should be both challenging and fun. We are proud to inspire creativity, foster belonging, support collaboration, and...


  • City Of London, United Kingdom Gram Games Full time

    Join to apply for the Principal Software Engineer role at Gram Games3 days ago Be among the first 25 applicantsJoin to apply for the Principal Software Engineer role at Gram GamesGet AI-powered advice on this job and more exclusive features.Who We AreGram Games is the studio behind popular titles like 1010!, Six!, Merge Dragons!, and Merge Magic!, with more...


  • London, United Kingdom Harnham Full time

    **PRINCIPAL SOFTWARE ENGINEER** **£90,000 - £100,000** **LONDON - HYBRID** **TECH STACK: Java, Kotlin, Typescript, Javascript, Vue.js, Github, Horoku** A successful rapidly growing start-up is hiring a Principal Software Engineer to join & lead their expanding London-based team. This company is working with a lot of personal data. They are seeking a...


  • London, United Kingdom Harnham Full time

    **Principal Python Engineer (start up)** **Up to £130,000 + equity + pension** **LONDON - HYBRID / MOSTLY REMOTE** **TECH STACK: Python, Kubernetes, Docker, Microservices, GCP** An extremely successful machine learning based start-up is hiring a Principal python engineer to join their expanding London-based team. They are seeking a motivated and...


  • City of London, Greater London, United Kingdom SGI Full time

    Principal Software Engineer | Front End (React) | London, Hybrid Our client is a forward-thinking global firm redefining the future of finance through technology. They are looking for a Principal React Engineer who can set the technical direction for the front-end, champion best practices, and still enjoy being hands-on. Someone who obsesses over clean...


  • City Of London, United Kingdom Clearwater Analytics, Ltd Full time

    Principal Software Development Engineer page is loaded## Principal Software Development Engineerlocations: London Officetime type: Full timeposted on: Posted Todayjob requisition id: R14057**Job Summary:**We are seeking a skilled and motivated Senior Software Engineer to join our dynamic team at CWAN. In this role, you will be responsible for...


  • City Of London, United Kingdom BAE Systems Full time

    Job Title Principal Software Engineer Location Isle of Wight - Cowes - We offer flexible working arrangements - Part time & accruing hours available. Please let us know if you would like to discuss these options Salary Up to £75,900 (dependent on skills and experience) What you'll be doing Derive and maintain a set of software requirements from a baseline...