Overview
Principal Software Engineer with a Java Back End/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.
Salary £70-90k + Bens + Options
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)
* Cloud development ideally with AWS
* Proven experience in distributed systems/Kafka/event-driven systems
* Deep understanding of software architecture, patterns, scaling/resilience and ideally with domain-driven design
* 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
* Experience with Front End UI design and Front End development (MUI/React/JavaScript/TypeScript)
* Familiarity with Data Engineering patterns, Data Products/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 environment, with prior experience with related tooling (eg OPA, IRSA)
* Experience of working within startup environments
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-based 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.
Why join? 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.
Interested? Apply now or reach out to Opus Resourcing for more details.
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