Key Skills

Job Description

iwell - Harmonizing Clean Energy Utrecht About Iwell At iwell, we are all about reinforcing energy security. We help European businesses become more energy independent. With growing regulations, extreme price volatility and rising grid issues, they need to be resilient. It is time to take charge and think ahead. We deliver energy management solutions that ensure that businesses are always in control of their energy. Our in-house developed EMS and modular battery storage drive profit through sustainability, making businesses future-proof. We are a fast-growing international team of bold, talented individuals. From engineers and software developers to creative thinkers and customer-focused business developers. No matter what your strong suit is, we always are looking for people who are determined to make a positive impact. The Role The Optimisation team builds the Python applications that decide what our customers' energy assets should do, and when. Batteries, EV fleets, solar and grid connections all come together in our optimiser, and the team turns prices, forecasts and constraints into schedules and decisions that run in production every day. Much of this work has an operations-research flavour, and the problems rarely arrive neatly defined.. They arrive as a customer who needs their vans charged by 6:00 at the lowest cost or a battery whose value depends on the hour. We're looking for someone who is comfortable across that whole path: understanding the real-world problem, shaping it into something a computer can solve, and shipping and operating the result. You don't need to be an OR specialist. You do need to be a strong Python engineer who enjoys messy, concrete problems. Success In This Role Means Being Able To Take a loosely defined operational problem and turn it into working, maintainable production code. Work with data and models (optimisation, forecasting or plain statistics) without losing sight of the engineering. What you will do Create charging schedules for EV fleets that minimise electricity costs while guaranteeing every vehicle is ready when it needs to be. This means modelling tariffs, grid limits and departure times, and handling what happens when reality deviates from the plan. Calculate the value of each kWh produced or consumed, so that batteries, solar and flexible loads are steered by what energy is actually worth at that moment, and customers can see where their savings come from. Build forecasting models that predict operational issues before they happen, to maximise asset uptime and reduce the number of support tickets our Operations team has to handle. Take your work all the way to production: packaging, deployment, monitoring and bugfixing. Work with the rest of the Optimisation team on the shared tooling, data pipelines and modelling conventions the team uses.. What are looking for 5+ years of production Python development experience, writing clean, tested, maintainable code. A proven ability to translate real-world problems into working code. A pragmatic mindset: you choose the boring, well-understood solution when it's the right one, and you know when it isn't. Strong communication skills and a habit of documenting your work. Fluency in English is required. Weekly working hours of 32-40 hours Coming into the office 3-4 days per week Bonus points for None of these are required. We'd rather hire a strong engineer and teach the domain than the other way around. Experience with a modelling library such as cvxpy or Pyomo, or other operations research experience.. Time-series forecasting in production, or basic MLOps: keeping models trained, monitored and honest. Data analysis experience Energy, battery or electricity domain knowledge: tariffs, grid constraints, day-ahead and imbalance markets. The willingness to take on a People lead role in the team. Note: at iwell, we value growth potential over perfection. Feel free to respond if you can see yourself meeting this list in the (near) future. What we offer A competitive salary within the range of EUR 4400-EUR6600 + 8% holiday allowance 30 holidays per year, plus an annual company trip of 3 days The opportunity to do volunteer work, by offering 1 volunteer day per year Learning & Development budget of EUR 1,500 per year Attractive pension plan with Brand New Day Working remotely for 2 weeks per year We cover your travel costs, regardless of whether you come by bike, car, or public transport. A mobile phone allowance of EUR 25 per month Additional activities such as a bootcamp, volleyball tournament, company drinks etc. iwell is a family-friendly company and employs many employees with care-taking responsibilities Interested? For more information about iwell, what we do, why we do it, and an overview of our partners, visit https://iwell.eu/.

Core Responsibilities

Develop and operate production Python applications that optimize energy assets, including EV fleets, batteries, solar, and flexible loads, using schedules, forecasts, prices, and operational constraints. Build forecasting and modeling solutions, deploy and monitor them in production, and contribute to the team's shared tooling, data pipelines, and modeling conventions.

Requirements

Requires at least five years of production Python development experience, the ability to translate real-world operational problems into maintainable code, and a pragmatic approach to engineering. Strong communication and documentation skills and fluency in English are required; experience in optimization, forecasting, data analysis, or the energy domain is a bonus.

Benefits

• 8% Holiday Allowance
• 30 Days of Annual Leave
• Annual Company Trip
• Volunteer Day
• Learning and Development Budget
• Pension Plan
• Remote Work for Two Weeks per Year
• Travel Cost Coverage
• Mobile Phone Allowance
• Team Activities
• Family-Friendly Workplace