Senior Platform Engineer

As Platform Engineer III, you will deliver scalable platform services and shape infrastructure design and developer experience. You’ll work with autonomy to guide architecture decisions and support engineering teams in value-led delivery. You’ll uplift peers and contribute to ENSEK’s platform-first culture across product, delivery, and engineering. Expect to tackle complex, real-world problems at scale, enabling cost-efficient and reliable cloud-native solutions that accelerate the energy transition. This is an opportunity to shape the platform that powers global energy retailers at pace.

• 25 days’ holiday + bank holidays
• Option to buy or sell 5 extra annual leave days per year
• Vitality Health Insurance with private healthcare and mental-health support
• Pension with 5% matched contribution
• Regular team-wide and company-wide events
• 2 volunteering days per year to give back

• Demonstrate a growth mindset and foster an inclusive, safe environment
• Translate internal developer needs and platform strategy into technical decisions
• Use platform metrics and feedback to drive improvements and inform cost-effective options
• Break down large platform initiatives into incremental, deliverable slices
• Contribute to accurate estimation, planning, and risk management
• Produce clear golden path documentation to enable self-serve for teams
• Write high-quality, infrastructure-as-code and tooling (Terraform, Crossplane, Helm)
• Contribute to platform architecture discussions with cloud-native design options (EKS, GitOps, self-service)
• Improve observability, alerting, and operational practices across platform services
• Advocate secure coding and supply chain hygiene in line with ENSEK policy
• Share knowledge, mentor juniors, and onboard teams to platform capabilities
• Participate in platform and community improvement initiatives and promote golden path adoption

• Developer-focused: leverages internal insights to shape platform delivery
• Insight-driven: uses metrics and feedback to challenge assumptions
• Commercial awareness: understands cost implications of infrastructure
• Agility: breaks down complexity and supports refinement
• Simplicity: communicates clearly and simplifies processes
• Code & IaC: writes well-structured code and IaC (Terraform, Crossplane, GitHub Actions)
• Design: contributes to platform system design and cloud-native patterns (EKS, self-service)
• Operations: builds production-ready software and improves operational practices
• Security & Compliance: promotes secure development standards

• Growth mindset
• Ownership
• Psychological safety
• Terraform
• Crossplane
• Helm