Principal Engineer - Pricing Infrastructure

Who We Are: We are rebuilding the energy transaction, making it transparent and fair. Our goal is to put power back where it belongs, in the hands of customers and to take on one of the most critical problems of our century, access to low cost electricity. We exist to fix a broken global energy market that’s long favoured legacy operators, intermediaries, and opaque pricing. Today’s electricity system was not designed for rapid decarbonisation, AI-driven efficiency or fair access for the actual users - businesses and generators. We’ve built the first AI native transaction infrastructure to reinvent how electricity is bought, sold and priced. Our technology is designed to cut out the inefficient fees, automate complex market flows, and bring transparency and fairness to energy transactions at scale.

The Role: We are looking for a Senior Staff Engineer to help shape and scale Rosso: our core IP transaction infrastructure that saves our customers millions. Rosso brings together forecasting, margin and portfolio optimisation to price tender inputs through to contract, while keeping the portfolio balanced as we grow. Rosso sits on the critical path for revenue and customer experience. The problem space is complex and high stakes, with interdependent business rules, stateful workflows, and tight coupling between technical decisions and commercial outcomes. You will join a team with strong product vision and technical leadership, and you will play a key strategic role in tendering and the deal flow that drives it, bringing senior execution strength.

Responsibilities:

• Drive Technical Leadership through Execution: Lead and ship high-impact improvements across Rosso workflows, improving correctness, operability and scalability as volume and complexity grow.
• Drive Multi-Team Initiatives: Lead complex, cross-functional efforts across teams and systems - aligning stakeholders and delivering high-leverage outcomes.
• Build & Ship: Continue being deeply hands-on in designing, coding, and reviewing critical components across stateful backend services, APIs, and infrastructure.
• Strengthen Foundations: Improve reliability and operability, observability, testing strategy, and deployment practices.
• Integrate machine learning models into production: Partner with ML/Data teams to productionise a range of models safely and effectively within core Rosso workflows.
• Design for correctness in complex workflows: Build and evolve pricing and deal-flow workflows where consistency and failure handling are first-class concerns.
• Prevent domain drift: Create and maintain clear domain boundaries, shared language, and reduce compounding complexity over time.
• Multiply Impact: Mentor Staff and Senior Engineers, raise engineering standards, and act as a trusted technical advisor to leadership.
• Plan for Scale: Architect systems to handle high-volume quoting/pricing activity and large customer counts, anticipating bottlenecks before they emerge.

Requirements:

• Must-Haves: Exceptional technical leadership experience; Architectural depth; Proven patterns for high-throughput performance; Multi-team influence; Modern tech expertise; Data + domain modelling strength; Product & business alignment; First-principles problem solving; Navigating ambiguity.
• Desirable: Experience in high-performance environments; Delivered a large, complex initiative end-to-end; Experience scaling systems; Experience working closely with Machine Learning teams; Exposure to regulated industries; Familiarity with real-time pricing engines.

Benefits & Perks:

• Competitive salary: We review salaries twice a year using real-time market data.
• Stock Options: everyone on the team has ownership in our mission.
• 25 days holiday + public holidays: Swap public holidays for ones that matter most to you.
• Remote & flexible working: We’re fully remote with clear core hours.
• Home working & wellbeing budgets: Up to £1,200 annually to upgrade your remote setup.

We welcome applications from people of all backgrounds, experiences, and identities, including those that are traditionally underrepresented in the tech and energy sectors.