Senior Staff Engineer - Pricing Infrastructure (Rosso)

📈 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. tem exists 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. In late 2025, after extraordinary growth, we closed a $75 million Series B - led by Lightspeed Venture Partners with participation from Albion, Atomico, Allianz, Hitachi Ventures, Hitachi Ventures, Schroders Capital and others - positioning us for global expansion, deeper product innovation and category leadership. We’re scaling internationally and building toward a future where AI-driven infrastructure is foundational to electricity markets worldwide. Since launch, our modern utility product, known as RED, has already facilitated thousands of business customers and billions in energy transaction value, proving that modern software and AI can transform an industry built on legacy systems. At tem, we’re not just building another energy company, we’re rearchitecting market infrastructure so that transparency, efficiency and sustainability become the default, not the exception. 🏅 THE ROLE: We are looking for a Senior Staff Engineer to help shape and scale Rosso: tem’s 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. This means owning complex deliveries end-to-end, raising system quality and reliability, and preventing domain drift as the platform and organisation scale. This role combines deep hands-on engineering with strategic technical ownership and organisational influence. 🚀 RESPONSIBILITIES: - Drive Technical Leadership through Execution: Alongside Principal Engineers, you will 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 - driving monitoring of service objectives, incident reduction, and operational excellence. - Integrate machine learning models into production: Partner with ML/Data teams to productionise a range of models (including forecasting, optimisation and pricing) 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 c...