Senior Staff Machine Learning Engineer

📈 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 tackle one of the most critical problems of our century: access to low-cost electricity.

tem exists to fix a broken global energy market that has long favored legacy operators, intermediaries, and opaque pricing. Today’s electricity system was not designed for rapid decarbonization, AI-driven efficiency, or fair access for 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 cuts out inefficient fees, automates complex market flows, and brings 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, 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 IP, the transaction infrastructure that prices electricity for thousands of businesses, balances portfolios in real time, and sits on the critical path for every deal tem closes. Machine learning is at the heart of Rosso, combining forecasting, optimization, and classical ML to process billions of data points and drive thousands of automated decisions a day. Every inference shapes the prices our customers see, so you can immediately see the impact of your work.

We’ve proved the concept with MVPs and POCs to grow to 2% of the UK market. Now we want to take it to the next level and build toward a state-of-the-art solution to fuel our expansion in the UK and take Rosso international.

We're looking for a Senior Staff Machine Learning Engineer to lead pricing ML within Rosso, building a platform that proactively drives growth by targeting the right customers to sign at the right time. Your primary focus will be the pricing engine, which sets the fees added to every quote tem serves, carefully balancing growth and margin. You will also contribute to the systems that manage both short and long-term imbalance decisions to determine how tem deals with its exposure across its portfolio.

This is a hands-on, senior individual contributor role with significant technical leadership and organization-wide influence. You will work closely with other MLEs, software engineers, and MLOps to bring models to production and carry real ownership of the technical direction, accountable for its performance.

The right person is energized by the greenfield environment: comfortable taking on ambiguity and able to make progress before the path is fully defined. They have built pricing systems that worked and have learned from the times it hasn’t. They’ll bring that hard-won judgment to a system where the foundations are still being laid, and where early decisions compound. Success will be turning our current reactive system into a pricing engine that proactively drives growth by targeting the right customers to sign at the right time.

🚀 Responsibilities:

• Own the technical direction for pricing ML: Define what to build and how within the pricing engine, setting the strategy and roadmap for pricing machine learning as a core piece of tem's IP.

• Build ML systems for price optimization: Design and implement models that dynamically set prices, balancing the trade-off between signing probability, portfolio balance, and margin maximization.

• Solve imbalance problems: Develop probabilistic models to optimize risk management and short-term balancing decisions in a highly dynamic environment.

• Bridge modeling and production: Own the modeling and data layer while working closely with software engineers and MLOps to ensure models are architected for production, contributing to system design decisions that affect performance and reliability.

• Communicate pricing decisions clearly: Articulate model behavior, assumptions, and trade-offs to other technical stakeholders so that pricing decisions are understood across the teams that depend on them.

🎯 Requirements:

Must-haves:

• Deep experience building ML systems for pricing, revenue optimization, or decision-making under uncertainty, with a track record of models that went from concept to production and delivered measurable commercial impact.

• Strong foundation in stochastic optimization and probabilistic modeling, with the judgment to formulate ambiguous business problems as the right mathematical approach rather than reaching for familiar tools.

• Proven first-principles reasoning: you choose between stochastic programming, classical ML, reinforcement learning, or a simple heuristic based on the problem, not the technique you know best.

• The engineering craft to match your modeling depth: production-grade Python, a high bar for code quality and system design, and the ability to work alongside software engineers as a technical peer across the full ML lifecycle.

• Senior technical leadership in ML: a track record of setting direction for a significant technical area, influencing cross-functional teams, and translating complex model decisions into clear terms for commercial, product, and engineering stakeholders so they are understood and acted on.

Bonus points:

• Experience with reinforcement learning or causal inference in applied, commercial settings.

• Familiarity with energy markets, power trading, or portfolio management.

• A PhD or equivalent research depth in a quantitative discipline (statistics, applied mathematics, physics, operations research, or similar).

• Ability to reason about the trade-offs between optimization solvers (e.g., Gurobi) and gradient-based ML methods (e.g., PyTorch), and the judgment to know when to reach for each.

• Experience working with high data throughput systems in production.

✨ Benefits & Perks:

• Salary: Competitive salary—we are looking to pay £127,000 or equivalent in local currency.

  • We pay against a clear benchmark for your role and level. No fixed once- or twice-a-year cycle—pay moves when the evidence for it does.

• 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. Plus, get an extra day off for your birthday.

• Remote & flexible working—We're fully remote, distributed across Europe with clear core hours, and no internal meetings on Friday afternoons.

• Home working & wellbeing budgets:

  • Up to £1,200 / €1,200 annually to upgrade your remote setup (co-working passes, equipment, etc.).

  • Up to £150 / €150 monthly on anything that supports your wellbeing—from therapy to gym memberships to meditation apps.

🗣️ Interview Process:

Our processes normally take around 2-3 weeks from first call to offer—please let us know about any adjustments to timelines that may be required.

1. First call with our Talent Team (30 mins). This is to understand your experience, motivations, and discuss the role in more detail.

2. Behavioral Interview with our Rosso GM, hiring manager for this role (45 mins). This is your chance to really understand the role, the expectations, and ensure alignment on ways of working.

3. Technical Interview with the Team (90 mins). You’ll meet with potential peers in this session and discuss technical topics and experiences.

4. Culture-Add Interview with Stakeholders (45 mins). The final session will be with two cross-functional stakeholders, and will explore how your values align with ours, and is designed to be a genuine two-way conversation, your chance to understand what it’s really like to work at tem.