Principal Engineer

Company: Lorien
Apply for the Principal Engineer
Location: London
Job Description:

Principal Engineer (Backend)

About the Role

We’re looking for a Principal Backend Engineer to take ownership of end-to-end delivery of highly complex, multi-team initiatives. This is a senior technical leadership role where you’ll shape architecture, influence engineering strategy, and drive technical excellence across squads

.You’ll work in a fast-paced, agile environment alongside product, engineering, and commercial teams as we continue building innovative solutions in the sports betting, gaming, and interactive entertainment industry.

What You’ll Be Doing

  • Take ownership of delivery across large-scale, cross-functional projects
  • Drive architectural decisions and promote scalable, maintainable design
  • Challenge the tech status quo and lead modernisation, automation, and innovation initiative
  • Build high-quality, reusable, and scalable backend systems
  • Analyse system-wide dependencies, bottlenecks, and performance
  • Define and implement engineering best practices, standards, and processes
  • Lead design reviews and contribute to governance and architecture forums
  • Balance priorities across technical debt, quality, and delivery timelines
  • Champion security-first development and ensure robust controls in pipelines
  • Collaborate with Product Owners and Engineering Leaders to define MVPs and solutions
  • Mentor engineers, supporting their technical growth and development
  • Play an active role in hiring and building high-performing engineering teams

What We’re Looking For

Technical Skills

  • Strong expertise in Java (plus exposure to Go, Node.js, or Python)
  • Proven experience designing and building distributed systems
  • Deep understanding of system design, OOP, and design patterns
  • Experience building high-performance, low-latency, scalable systems
  • Strong knowledge of microservices & monolith architectures
  • Experience with CI/CD pipelines and automation
  • Hands-on experience with Kubernetes, containerisation, Helm/Kustomize
  • Strong knowledge of APIs and system integrations
  • Experience with monitoring, logging, and performance optimisation
  • Good understanding of application security (Auth, encryption, SAST/DAST)
  • Familiarity with event-driven architectures (Kafka, RabbitMQ, NATS)
  • Experience with caching solutions (Redis, Hazelcast, etc.)
  • Exposure to cloud platforms
  • Understanding of Agile methodologies

Nice to Have

  • Exposure to AI/ML or data engineering (ETL pipelines, analytics)
  • Experience with technology strategy and governance
  • Background in the betting, gaming, or entertainment industry

Why Join Us?

  • Work on high-impact, large-scale systems
  • Influence architectural direction and engineering standards
  • Be part of a high-energy, fast-scaling tech environment
  • Collaborate with top engineers and industry experts
  • Opportunity to help build a market-leading product in a cutting-edge space

Posted: July 1st, 2026