Senior Software Engineer (Kotlin) in City of London

Energy Jobline ZR; City Of London; Hybrid; GBP 80,000 - 105,000; Full time

Job summary

A leading clean tech company in London is seeking a Senior Software Engineer specializing in Kotlin. In this hybrid role, you will lead architectural advancements and optimize production systems, contributing to impactful solutions in the energy sector. Ideal candidates possess robust JVM experience with a strong systems-thinking mindset. The position offers a salary up to £105,000 plus bonuses and excellent benefits.

Benefits

Bonus

Excellent benefits

Qualifications

• Deep experience in JVM/backend development.
• Experience with architectural leadership.
• Ability to scale production systems effectively.

Responsibilities

• Evolve platform architecture across distributed systems.
• Analyse production systems to resolve performance issues.
• Lead backend design using Kotlin.

Skills

JVM/backend experience

Kotlin

Systems thinking

Cross-functional collaboration

Tools

AWS

GCP

Job description

Energy Jobline is the largest and fastest growing global Energy Job Board and Energy Hub. We have an audience reach of over 7 million energy professionals, 400,000+ monthly advertised global energy and engineering jobs, and work with the leading energy companies worldwide.

We focus on the Oil & Gas, Renewables, Engineering, Power, and Nuclear markets as well as emerging technologies in EV, Battery, and Fusion. We are committed to ensuring that we offer the most exciting career opportunities from around the world for our jobseekers.

Job Description

Senior Software Engineer (Kotlin)

Up to £105,000 + 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 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.