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About the Role
As a Senior Controls Engineer at STEM GmbH, you will work with software, control systems, and clean energy technology. You will be responsible for the controller and EMS solution for PV, BESS, and Hybrid projects, from concept and grid-code requirements through commissioning and handover. This role involves parameterizing and optimizing controllers, driving certification processes, and providing simulation models for utilities. You will also serve as the primary controls expert for project engineers and act as a technical interface to the development team, translating field requirements into product improvements. This is a senior, high-ownership delivery role with a strong connection to product development within a collaborative, international team.
Responsibilities
- Own the controller and EMS solution for PV, BESS, and hybrid projects within the Delivery team, from design phase through commissioning and handover.
- Adapt, parameterize, and optimize the CODESYS-based controller and broader EMS functionality (e.g., dispatch, curtailment, asset coordination) to project-specific and grid-code requirements, including PPC tuning of ramp rates, frequency response, Q(U)/Q(P) curves, and curtailment setpoints.
- Prepare and execute project-specific controller simulations in MATLAB/Simulink and pre-commissioning validation using the SiL/HiL test environment, in coordination with Dev.
- Lead controller tuning during commissioning, including grid-compliance and performance tests, on site or remotely.
- Support project engineers in troubleshooting complex controller and plant behavior, including signal path tracing, log analysis, protocol-level diagnostics, and systematic root-cause identification.
- Support integration of the controller with SCADA, grid operator interfaces, and communication protocols (Modbus, IEC 61850, IEC 60870-5-104).
- Create project documentation such as control concepts, functional specifications, test protocols, and commissioning reports.
Requirements
- Degree in Control Engineering or Electrical Engineering.
- 5+ years of professional experience in power plant control, project engineering, or commissioning of utility-scale PV, BESS, or hybrid power plants.
- Hands-on experience with CODESYS (IEC 61131-3) and controller simulation in MATLAB/Simulink.
- Experience preparing or supporting simulation models for utilities in DIgSILENT PowerFactory and/or PSS/E.
- Solid understanding of control theory, power plant controllers (PPC), and EMS/PMS functionality beyond the pure controller function (e.g., dispatch, curtailment, asset coordination).
- Track record supporting or leading controller certification processes and grid code compliance topics.
- Proven commissioning experience and confidence in direct technical interaction with customers and grid operators.
- Proven, hands-on troubleshooting skills to isolate and fix controller and integration issues.
- Fluent English communication skills (written and spoken).
- Experience in project-driven environments with responsibility for scope, timelines, and stakeholders.
- Familiarity with international grid codes and standards (e.g., VDE-AR-N 4110/4120, ENTSO-E RfG, FGW TR8), ideally including at least one non-European market.
- Familiarity with communication protocols (Modbus, OPC-UA, IEC 61850, IEC 60870-5-104, DNP3) and protocol-level diagnostics.
- Experience with SiL/HiL testing and Git-based workflows; pre-sales support (scope, effort estimation, feasibility).
- Experience mentoring junior engineers and the ability to challenge existing solutions.
- German communication skills.
Skills
- CODESYS (IEC 61131-3)
- MATLAB/Simulink
- DIgSILENT PowerFactory
- PSS/E
- Control theory
- Power plant controllers (PPC)
- EMS/PMS functionality
- Controller certification
- Grid code compliance
- Commissioning
- Troubleshooting
- SCADA integration
- Modbus
- IEC 61850
- IEC 60870-5-104
- OPC-UA
- DNP3
- SiL/HiL testing
- Git workflows
- Pre-sales support
- Mentoring junior engineers
Location
- Berlin
Work Type
- Permanent employment
- Flexible working hours
Experience Level
- Senior
- 5+ years of professional experience
Education Level
- Degree in Control Engineering or Electrical Engineering
Benefits
- International, growing team across 7 countries
- Work at the forefront of the energy transition
- Modern office in Berlin
- Trust-based model
- Collaborative, appreciative team culture
- Urban Sports Club subsidy
- BVG Job Ticket (Deutschlandticket subsidy)
About the Company
- STEM GmbH is a company focused on clean energy technology, working at the intersection of software, control systems, and renewable energy.
- STEM offers solutions, technology, partners, case studies, resources, and the latest news on their website stem.com.