Principal Software Engineer

1 day ago

London, Greater London, United Kingdom Monolith Full time £120,000 - £240,000 per year

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.

You'll be owning in conjunction with the VP Engineering the technical vision and execution of our platform's evolution to a more distributed architecture, making it AI-agentic ready for the next generation of AI applications.

Key Responsibilities
Technical Leadership & Architecture

  • 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
  • Own technical decisions balancing immediate business needs with long-term architectural goals

Hands-On Development

  • Write production-quality Python code for critical platform components
  • Build and optimize distributed compute services
  • Implement reliable workflow orchestration patterns

Team Mentorship & Collaboration

  • Mentor mid-level developers, elevating the technical capabilities of the entire team
  • Establish 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: You write clean, maintainable code and design systems that scale
  • Pragmatic Problem-Solver: You balance perfectionism with shipping, making smart trade-offs between short-term delivery and long-term goals
  • Strong Leadership: You proactively identify problems and drive solutions forward
  • Mentorship Mindset: You elevate others through knowledge sharing and patient guidance
  • Ownership Mentality: You take full responsibility for outcomes and drive initiatives to completion
  • Customer Obsession: You understand that our success is measured by our customers' success

  • Principal Software Engineer

    1 week ago

    London, Greater London, United Kingdom Orbis Full time £170,000 - £255,000 per year

    Principal Software Engineer (Golang | Distributed Systems) London - On-site Up to £170,000 base + 25% bonus + excellent benefits Permanent I'm partnered with a high-growth technology company building a world-class data and services platform that processes tens of billions of monthly requests - powering real-time insights for millions of users...

  • Principal Software Engineer

    1 week ago

    London, Greater London, United Kingdom Computer Futures Full time £60,000 - £100,000 per year

    Principal Software Engineer - Lead the Future of UK GovTech InnovationUp to £100,000 + Premium Benefits PackageRemote-First | Just 1 Day Onsite Every 2 WeeksSC Clearable | British Citizens OnlyWhere Technology Meets PurposeAre you ready to lead engineering efforts that directly impact national security, public services, and digital transformation across the...

  • Principal Software Engineer

    5 days ago

    London, Greater London, United Kingdom Ripjar Full time

    Ripjar specialises in the development of software and data products that help governments and organisations combat serious financial crime. Our technology is used to identify criminal activity such as money laundering and terrorist financing, and enables organisations to enforce sanctions at scale to help combat rogue entities and state actors.Team...

  • Principal Software Engineer

    1 week ago

    London, Greater London, United Kingdom Patchwork Health Full time £90,000 - £115,000 per year

    About UsAs featured in the likes of The Telegraph, Independent and Forbes, Patchwork is an award-winning digital healthcare solution that was built by doctors, for doctors.We are a rapidly growing team of 100+ people revolutionising flexible working in the NHS and are helping NHS organisations save millions (and counting), by connecting them to an increasing...

  • Principal Embedded Software Engineer

    2 weeks ago

    London, Greater London, United Kingdom IC Resources Full time £80,000 - £120,000 per year

    Join a fast-moving team solving some of the hardest problems in applied AI. This company builds technology for real-world impact… systems that operate in extreme environments, support mission-critical operations, and push the limits of what embedded intelligence can do. They're looking for aPrincipal Embedded Software Engineerwho thrives on deep technical...

  • Principal Software Developer

    5 days ago

    London, Greater London, United Kingdom Oracle Full time £60,000 - £120,000 per year

    DescriptionThe Strategic Customers Engineering organization is looking for a passionate Principal Software Developer to support the onboarding and operations of some of the most important OCI customers.ResponsibilitiesKey details:Location: Remote, within the UK (with occasional travel to Milton Keynes, UK).Organisation: Oracle Cloud Infrastructure (OCI) –...

  • Principal Software Engineer

    4 days ago

    London, Greater London, United Kingdom monday Full time £80,000 - £120,000 per year

    DescriptionIn just a few short years, has evolved from a fast-growing startup into a publicly traded, multi-product company and one of the world's fastest-growing SaaS businesses. Our journey is defined by hyper-growth, global expansion, and a relentless focus on impact at scale.Our product suite can adapt to the needs of diverse industries and use cases...

  • Senior or Principal Software Engineer

    1 week ago

    London, Greater London, United Kingdom Jobgether Full time £90,000 - £105,000 per year

    This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior or Principal Software Engineer - Red Hat OpenShift in EMEA.This role offers an opportunity to work on cutting-edge cloud-native technologies and open source platforms, contributing to the evolution of enterprise container and Kubernetes solutions. The...

  • Principal Engineer

    4 days ago

    London, Greater London, United Kingdom The Difference Engine Full time £80,000 - £160,000 per year

    Are you an experienced Senior Principal Engineer looking for your next challenge? We're looking for an exceptional Senior Principal Engineer to lead the technical direction and architecture of our most critical systems. This is a high-impact leadership position where you'll define engineering standards, mentor senior teams, and shape the future of our...

  • Principal Engineer, Software

    2 weeks ago

    London, Greater London, United Kingdom Syniti Full time £80,000 - £120,000 per year

    About UsSyniti istheenterprise data partner, empowering anyone who relies on data to make business-critical decisions by delivering data they can trust through a unique combination of intelligent software and experts who deeply understand the role of data in enterprise growth.Trusted by the Fortune 2000, Syniti helps leading businesses reconfigure the role...