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-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 arch...