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. 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. 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: 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 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 at a high-growth startup.
• Architectural depth in designing and evolving complex, stateful distributed systems.
• Proven patterns for high-throughput performance and scaling architecture.
• Experience leading cross-team initiatives impacting revenue.
• Deep experience with Python, AWS serverless architecture, event-driven systems.
• Strong ability in data modelling for complex, interdependent business rules.
• Demonstrated ability to connect technical decisions to business outcomes.
• Ability to reason from fundamentals to design solutions in complex domains.
• Comfort operating in evolving environments.

Desirable:

• Experience in high-performance / high-scale environments.
• Delivered a large, complex initiative end-to-end with clear business impact.
• Experience scaling systems from early product-market fit to multi-product platforms.
• Experience working closely with Machine Learning teams.
• Exposure to regulated industries.
• Familiarity with real-time pricing engines or AI/agentic systems.
• Experience improving engineering org design or platform strategy.

Benefits & Perks:

• Competitive salary reviewed twice a year.
• Stock Options for everyone on the team.
• 25 days holiday + public holidays.
• Remote & flexible working with clear core hours.
• Home working & wellbeing budgets.

We welcome applications from people of all backgrounds, experiences, and identities, including those that are traditionally underrepresented in the tech and energy sectors. If you’re excited about this role but not sure you meet every requirement, we’d still love to hear from you.