Principal Software Engineer - Java

New Yesterday

This range is provided by Opus Resourcing Ltd. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range Salary £70-90k + Bens + Options Overview Principal Software Engineer with a Java backend / full-stack experience to take a lead role in designing and architecting the SaaS platform for an early-stage clean-tech startup on a mission to accelerate the shift to a greener energy world by optimising complex grid-scale battery assets for asset owners through data, ML, and SaaS innovation. Proximity to Cambridge would be ideal, although a remote role across the UK / with some company meetups. A UK-based role that requires being eligible to work. Interested? Apply now or reach out to Opus Resourcing for more details. What you’ll be doing as a Principal Engineer
Lead on software design, architecture, and coding to shape a scalable, resilient full-stack SAAS platform. Build cloud-native Java microservices (Spring Boot / Micronaut) and drive engineering practices. Drive continuous improvement in engineering culture, mentoring/coaching other engineers and guiding technical decisions. Collaborate across product, engineering, and customer teams to deliver impactful solutions to the SaaS platform.
You’ll bring strong software engineering practices to a fast-moving, collaborative environment, setting technical direction while staying hands-on with code within a small, focused cross-functional team. This is a rare opportunity to be part of the early days of a high-growth renewable energy startup, shaping both the product and the engineering culture. You’ll have the freedom to make architectural decisions that matter — while contributing directly to the clean energy transition. Cambridge-based office, with flexibility to work fully remote across the UK. Key skills you will bring as a Principal Software Engineer
Proven track record in building enterprise-grade Java / Microservices backend systems (Spring Boot or Micronaut preferred) Cloud Native development ideally with AWS Strong experience with DDD / Domain Driven Design Sound knowledge of design and build of distributed systems / event-driven systems, ideally with Kafka Deep understanding of software architecture, patterns, scaling/resilience. Hands-on expertise with platform engineering / DevOps practices (Kubernetes, Terraform, containers, CI/CD, ECS, Gitlab etc). A proactive, startup mindset with the ability to balance strategy and execution.
Nice to have skills as a Principal Engineer
Familiarity with Data Engineering patterns, Data Products / Kafka / Kafka streams, and Data Pipelines. Experience with platform-as-a-product delivery or platform engineering. Familiarity with Machine Learning Engineering tools and frameworks. Experience with microservice networking and service meshes (such as Istio). Well-informed on security considerations in a cloud native environment, with prior experience with related tooling (e.g. OPA, IRSA) Experience of working within startup environments
Seniority level
Mid-Senior level
Employment type
Full-time
Job function
Information Technology
Industries
Software Development
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Location:
Cambridge, England, United Kingdom
Job Type:
FullTime

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