Staff Software Engineer - Platform

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

We're looking for a Staff Software Engineer to provide technical leadership within our Platform Engineering organisation.

This is a hands-on technical leadership role where you'll lead one or more engineering teams responsible for the shared capabilities that power ENSEK's products and customer experiences. These include public and partner APIs, authentication and access management, platform configuration, and customer onboarding services.

You'll combine deep technical expertise with strong engineering leadership, helping shape architecture, drive engineering excellence, and mentor those around you. Working closely with Engineering Managers, Product Managers and fellow Staff and Principal Engineers, you'll play a key role in ensuring the ENSEK platform can scale to support new customers, products and international markets.

As a Staff Software Engineer, you will

Lead the technical direction and architecture of your team's domain, balancing immediate delivery needs with long-term platform scalability and maintainability.

Drive architectural decision-making through design reviews, technical proposals and Architecture Decision Records (ADRs).

Design, build and evolve secure, scalable APIs and shared platform services used by customers, partners and internal engineering teams.

Establish and champion authentication and authorisation patterns using industry standards such as OAuth 2.0, OpenID Connect, API Keys and mutual TLS (mTLS).

Remain hands-on in the code, contributing to the design and delivery of critical platform capabilities.

Support the evolution of foundational services that enable customer onboarding, configuration management and platform extensibility.

Raise engineering standards for software quality, testing, observability, security and operational excellence.

Partner with Site Reliability Engineering (SRE) and Developer Experience teams to improve reliability, deployment processes and developer productivity.

Collaborate with Product Managers, Engineering Managers and Technical Authors to turn customer and business requirements into clear technical solutions.

Mentor engineers across multiple levels, fostering a strong engineering culture built on learning, ownership and technical excellence.

Lead by example through code reviews, technical coaching and cross-team collaboration.

You'll know you're making an impact when

Your team has a clear and well-understood technical roadmap that aligns with ENSEK's wider platform strategy.

Core platform capabilities such as APIs, authentication services, onboarding and configuration management are secure, reliable and easy to consume.

Internal and external consumers can integrate with the platform through well-documented, self-service capabilities with minimal bespoke support.

Delivery performance improves through reduced lead times, more frequent deployments and higher engineering confidence.