Senior Staff Engineer - Transaction Platform

Requirements

• You operate at Staff+ level with a track record of organisation-wide impact. You've owned major technical initiatives at a high-growth startup and can point to what changed because of it. Not just influence - shipped outcomes.
• You have deep application architecture experience in complex domains. You've designed and evolved stateful distributed systems - APIs, event-driven architectures, data systems - where business logic is the hard part. You know what domain drift looks like and how to prevent it.
• You're comfortable working in Python. Our codebase is Python. You don't need to be a Python specialist, but you should have meaningful exposure to production Python systems and be confident contributing to and reviewing Python code from day one.
• You're strong with AWS serverless architecture. Hands-on experience with Lambda, API Gateway, DynamoDB, and event-driven, asynchronous workflows - operated in production an

Benefits

Additional Information

📈 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: Rosso is tem's core pricing infrastructure. It brings together forecasting, margin optimisation, and portfolio balancing to price energy tenders from first input through to signed contract - and keeps the portfolio healthy as we grow. It sits directly on the critical path for revenue. You'll join a team with strong product vision and technical leadership and take on complex deliveries end-to-end - owning the architecture, writing the code, raising system quality, and preventing domain drift as the platform and organisation scale. You'll work closely with our ML and Data Science teams and play a meaningful role in how pricing models are integrated into production. This role combines deep hands-on engineering with strategic technical ownership. We're looking for someone who drives to concrete solutions under ambiguity, uses the people around them as a resource, and takes accountability for outcomes - not just execution. If your instinct when given a hard problem is to get into it, commit to a direction, and deliver - this role is for you. 🚀 Responsibilities: Own and ship complex deliveries. Lead high-impact improvements across Rosso's pricing and deal-flow workflows - improving correctness, operability, and scalability as volume and complexity grow. You drive these from design through to production. Make architectural decisions that stick. Design and evolve a stateful, event-driven system where domain logic is the primary source of complexity. Create clear domain boundaries and prevent the kind of drift that compounds over time. Partner with ML and Data Science. Work closely with our ML and Data Science teams on integrating forecasting, optimisation, and pricing models into Rosso's core workflows. You don't need to be an ML practitioner - but you'll be a genuine technical partner in how models land in production. Lead across teams. Drive cross-functional initiatives spanning engineering, product, data, and commercial stakeholders. Align people around a technical direction and deliver. Raise the bar. Mentor Staff and Senior Engineers, strengthen observability and testing practices, and act as a trusted technical voice to engineering leadership. Plan for scale. Architect systems for high-volume quoting activity and large customer counts - anticipating bottlenecks before they emerge. 🎯 Requirements:

Your Match

How well this role fits your profile.

Company Intel

What employees say

Worked at tem? Share your experience