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Lead Software Engineer (JVM/Kotlin)

Understanding Recruitment

Greater London

Hybrid

GBP 120,000 - 150,000

Full time

Yesterday
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Job summary

A leading recruitment agency is seeking a Principal Software Engineer specializing in JVM and Kotlin to join a high-caliber team in London's clean tech sector. You will focus on improving platform architecture and performance systems while mentoring team members. The ideal candidate will have strong JVM experience, a systems-oriented mindset, and excellent communication skills. This position offers a salary of up to £150,000 along with bonuses and benefits.

Benefits

Bonus
Excellent Benefits

Qualifications

  • Deep JVM/backend experience; Kotlin a bonus, but not required.
  • Strong systems thinker with a track record of architectural leadership.
  • Experience scaling production systems in fast-moving product environments.
  • Clear communicator who enjoys cross-functional collaboration and technical ownership.

Responsibilities

  • Own and evolve platform architecture across distributed systems.
  • Analyse production systems to uncover and resolve performance issues.
  • Lead backend design using Kotlin (or JVM), supporting a polyglot mindset.
  • Collaborate across engineering to improve practices, tooling, and system design.
  • Mentor and influence technical direction company-wide.

Skills

JVM/backend experience
Kotlin
Systems thinking
Performance analysis
Cross-functional collaboration

Tools

AWS
GCP
CI/CD

Job description

Principal Software Engineer (JVM/Kotlin) - GreenTech/EV

Up to £150,000 + bonus + excellent Benefits

Hybrid - 2 days onsite in Central London (Zone 1)

Are you a JVM engineer curious about Kotlin - or already loving it? Want to solve complex problems that contribute to a greener, more sustainable world?

Join a high-calibre engineering team building modern, customer-facing and energy-focused systems in one of the UK's most exciting clean tech companies.

You'll lead one of their core teams, diving deep into production systems, identifying bottlenecks, and driving long-term architectural decisions that support scale, resilience and product growth.

What You'll Do

  • Own and evolve platform architecture across distributed systems.
  • Analyse production systems to uncover and resolve performance issues.
  • Lead backend design using Kotlin (or JVM), supporting a polyglot mindset.
  • Collaborate across engineering to improve practices, tooling, and system design.
  • Mentor and influence technical direction company-wide.


Tech & Environment

  • Kotlin (JVM), distributed systems, microservices, CI/CD
  • Cloud-native platforms (AWS/GCP), modern engineering culture


What They're Looking For

  • Deep JVM/backend experience; Kotlin a bonus, but not required.
  • Strong systems thinker with a track record of architectural leadership.
  • Experience scaling production systems in fast-moving product environments.
  • Clear communicator who enjoys cross-functional collaboration and technical ownership.


Want to work on complex problems with real-world environmental impact?

Apply now and help shape the future of clean energy at scale.

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