Staff Site Reliability Engineer

ENSEK; United Kingdom; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

25 days holiday

Extra leave days

Private health insurance

Pension with 5% matched

Team events

Volunteer days

Remote-first with London & Nottingham

Job summary

ENSEK is seeking a growth-minded engineer to help scale cloud-native SaaS for energy retailers across the UK. You’ll shape product strategy, deliver with agile practices, and mentor teams to improve reliability and performance.

Join a remote-first culture with London and Nottingham offices, strong focus on security, observability, and collaborative engineering practices to drive the energy transition forward.

Qualifications

• Must demonstrate ownership of outcomes and lead with accountability.
• Proven ability to learn quickly and share knowledge across teams.
• Strong communication and collaboration across product, delivery, and engineering teams.

Responsibilities

• Model a strong growth mindset through continuous learning, experimentation, and knowledge sharing.
• Demonstrate high ownership and hold peers accountable for quality, delivery, and outcomes.
• Intervene constructively in unhealthy debates, promoting psychological safety and inclusion.
• Demonstrate resilience during periods of ambiguity or pressure, helping others navigate challenges.
• Use customer and market insight to guide product and technical decisions.

Skills

Growth Mindset

Ownership

Psychological Safety

Resilience

Cross-functional Leadership

Communication

Mentoring

Job description

About ENSEK ENSEK builds the cloud‑native SaaS software that’s transforming how energy retailers operate, innovate and manage at scale.

We help retailers lower operating costs, improve billing accuracy for consumers, and enhance customer experience through automation and AI‑driven insight, all underpinned by modern, cloud‑native architecture.

ENSEK is at an exciting inflection point as we scale at pace towards new international horizons. If you’re driven by solving complex, real‑world problems and want to build modern technology that accelerates the global energy transition, you’ll feel right at home with us.

About the role

KEY RESPONSIBILITIES:

People & Conduct

• Model a strong growth mindset through continuous learning, experimentation, and knowledge sharing.
• Demonstrate high ownership and hold peers accountable for quality, delivery, and outcomes.
• Intervene constructively in unhealthy debates, promoting psychological safety and inclusion.
• Demonstrate resilience during periods of ambiguity or pressure, helping others navigate challenges.

Product

• Use customer and market insight to guide product and technical decisions.
• Shape product direction by identifying customer centric opportunities and validating assumptions using data.
• Apply commercial awareness to evaluate tradeoffs, prioritise effectively, and propose cost efficient solutions.
• Support product partners in clearly communicating value delivered by the team.

Delivery

• Break down complex initiatives into iterative, value focused slices to unlock early learning.
• Facilitate high quality planning, estimation, and refinement activities.
• Champion agile delivery practices and help the team improve predictability and flow.
• Communicate strategy, risks, and technical concepts clearly and concisely to all audiences.

Engineering Practices

• Write excellent, maintainable, and testable code; set high quality standards.
• Lead design discussions considering scalability, reliability, and maintainability.
• Guide testing strategy for complex journeys.
• Influence secure development practices.

Operations

• Lead by example in building and running highly reliable, production‑ready systems.
• Drive improvements in observability, alerting, incident management, and operational readiness.
• Support and guide the team during incidents, maintaining clarity under pressure.
• Ensure operational considerations are embedded into design decisions.
• Promote learning from incidents and prioritise resulting improvements.

Engineering Community

• Coach and mentor engineers across teams, contributing to capability uplift.
• Share innovations, patterns, and best practices across ENSEK’s engineering community.
• Contribute to community forums, guilds, and strategic engineering initiatives.
• Promote and uphold ENSEK’s engineering values and culture.

Key Skills

Product

• Customer Focus: Uses customer insight proactively to shape strategy and solutions.
• Insight Driven: Applies data to inform decisions and challenge assumptions.
• Commercial Awareness: Considers cost, efficiency, and long‑term value in decision making.

Delivery

• Agility: Breaks down complexity and supports team level delivery improvements.
• Simplicity: Shares complex ideas in accessible ways; drives simplification in systems and processes.

Engineering

• Code: Produces exemplary code; reviews effectively; avoids and prevents over‑engineering.
• Design: Contributes to architectural direction; considers system‑wide impact; mentors others in design.
• Operations: Builds and improves production ready solutions; guides operational practices.
• Security & Compliance: Champions secure coding and compliance at team and domain level.

Soft Skills

• Growth Mindset: Role models continuous learning, embraces feedback, and fosters a culture of improvement and innovation.
• Ownership: Demonstrates high accountability, sets clear expectations, and creates a safe‑to‑fail environment.
• Psychological Safety: Champions inclusivity, defines values and practices that promote diversity and sets goals for diverse teams.
• Challenge & Support: Creates an environment of high support and high challenge, encouraging respectful debate and broad thinking.
• Resilience: Recognises and removes stressors, role models positivity, and galvanises the organisation during setbacks.

Benefits

• 25 days’ holiday + bank holidays
• Option to buy or sell 5 extra annual leave days per year
• Vitality Health Insurance, including private healthcare, virtual GP access, mental‑health support and wellbeing perks (50% off gym memberships‑Virgin Active, Nuffield, PureGym)
• Pension with 5% matched contribution
• Regular team‑wide and company‑wide events
• 2 volunteering days per year to give back
• Remote‑first working environment with offices in London and Nottingham