Senior Project Developer - Battery Energy Storage Systems (BESS)

Senior Project Developer - Battery Energy Storage Systems (BESS)

STX Group

Amsterdam, Netherlands

As the energy system evolves, battery energy storage is becoming a critical pillar for enabling decarbonization, flexibility, and electrification.

Within our renewable power offering we are now building a new team that will be dedicated to identifying, developing, and executing Battery Energy Storage System (BESS) projects across our global corporate client base.

ROLE OF A SENIOR PROJECT DEVELOPER

We are looking for a Senior Project Developer - BESS to become one of the founding members of our new Energy Storage business unit. In this role, you will lead the full lifecycle of medium-scale front-of-the-meter and on-site battery projects at corporates - from opportunity identification to execution and operational contract management.

Leveraging STX’s existing relationships with thousands of corporates through STRIVE, you will work hand‑in‑hand with our Corporate Account Managers and Power teams to convert client opportunities into bankable BESS projects.

You will also be supported by junior engineers as the portfolio grows, making this a pivotal role in shaping our technical and development capabilities.

KEY RESPONSIBILITIES

Opportunity Identification & Pre‑Development

• Assess technical and commercial feasibility of BESS opportunities identified through STX’s corporate decarbonization engagements;
• Analyze client load profiles, flexibility needs, and grid connection constraints;
• Evaluate use cases including peak shaving, arbitrage, FCR/ancillary services participation, PV+BESS hybridization, EV charging integration, etc.;
• Conduct site visits, initial technical assessments, and grid connection prechecks.

Full Project Development

• Lead the entire development process from concept through to NTP:
  • Technical sizing & modelling;
  • Business case and financial modelling (with internal finance support);
  • Grid and permitting process management;
  • CAPEX/OPEX benchmarks;
  • Technology/solution assessment and vendor screening;
  • EPC and OEM negotiations;
  • Evaluate potential environmental and social impact of the project.
• Prepare internal investment cases and secure approvals.

Execution & Delivery

• Oversee execution-phase activities in collaboration with EPC partners:
  • Engineering & design validation;
  • Schedule and construction oversight;
  • Factory acceptance tests (FAT), commissioning and performance testing.
• Ensure delivery is on time, on budget, and compliant with all regulations.

Operational Handover & Contract Management

• Manage long-term service agreements, warranties, and performance guarantees;
• Coordinate with trading/optimisation stakeholders for operational strategy;
• Monitor asset performance and steer corrective actions when needed.

Internal Leadership & Team Building

• Mentor junior engineers supporting your portfolio;
• Help build processes, templates, and best practices for the new business unit;
• Support Sales and Origination in developing compelling BESS propositions for corporate clients.

KEY REQUIREMENTS

• 5–10 years of relevant experience developing BESS or similar grid‑connected energy assets (solar, CHP, demand-side flexibility, microgrids, etc.);
• Strong understanding of:
  • Battery technologies & system integration;
  • EMS/controls architecture;
  • Grid connections, network operator processes, and regulatory frameworks;
  • EPC delivery models and project finance principles.
• Proven track record of taking energy infrastructure projects from concept through construction or operation;
• Confident in managing technical, commercial, regulatory, and multi‑stakeholder elements of complex projects;
• Entrepreneurial mindset: enjoy building, improving, and scaling processes in a new business unit;
• Excellent communication skills and ability to engage with corporate clients;
• Ability to travel to client sites when required.