Product Manager - API

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.

Position Summary

The Product Manager for API owns the strategy and delivery for one of ENSEK's most critical platform capabilities: the API-as-a-product framework . In this role you are accountable for defining a consistent, scalable approach to how APIs are built, governed, and consumed — internally and externally. You work closely with engineering, commercial, and domain teams to ensure these platform investments unlock measurable value across the business.

Key Accountabilities & Responsibilities

• Own the strategy, vision and roadmap for both the API-as-a-product programme — engaging stakeholders across engineering, commercial, and customer teams to define, validate and iterate it continuously.

• Define and drive a consistent framework for API definition and management across three tiers: internal domain APIs, cross-NSEC internal APIs, and external APIs for customers, brokers, and third parties.

• Make evidence-based prioritisation decisions, estimating effort and value of roadmap items using AI-powered estimation tools, and communicating trade-offs transparently with stakeholders.

• Define and track key product outcomes — implementing dashboards for real-time performance visibility and using data to drive continuous improvement.

• Build long-term stakeholder relationships, implementing communications strategies and influencing effectively to drive alignment and outcomes.

Key Outcomes

• A consistent, governed API framework adopted across internal and external consumers, with measurable improvement in API reliability and developer experience.

• Roadmap delivered to agreed timelines, with clear evidence of value realised against investment.

• Defined and tracked KPIs for API areas, with regular data-driven reviews.

• Positive stakeholder feedback on communication, transparency and decision-making quality.

• Growing team confidence and capability as a result of your product leadership.

Skills, Knowledge, Experience & Qualifications

• Demonstrable experience owning and delivering a platform or infrastructure product end-to-end, ideally including API management or developer tooling.

• Ability to make autonomous, data-informed product decisions and communicate them clearly to technical and non-technical audiences.

• Experience managing complex stakeholder relationships, including senior commercial partners.

• Ability to create and maintain a product roadmap tied to strategy and outcomes.

• Experience working in energy, utility tech, SaaS, or platform-based product environments is advantageous.

• Familiarity with API management tooling, experimentation platforms, and AI productivity tools is advantageous.

Company 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