Green Fusion
Green Fusion sells software that automates and optimizes boiler room operations for energy efficiency and sustainability in the housing industry. The Berlin-based company raised $16M in Series A funding in January 2025 and employs 111 people.
The growth story
Green Fusion grew from 17 to 111 employees between 2022 and 2026, raising $16M along the way, most recently a Series A in January 2025.
About
Green Fusion develops software that analyzes, controls, and monitors boiler room systems to improve energy efficiency and reduce CO2 emissions. Its tools support both conventional systems and newer energy technologies, targeting housing industry clients seeking cost and energy savings.
The company, founded in 2021, has grown to 111 employees and secured $16M in Series A funding in early 2025. Its investor group includes BitStone Capital, Brandenburg Kapital, and HV Capital.
Founders and leadership
Engineering is Green Fusion's largest function, with 16 employees. The company has a median tenure of just one year, suggesting rapid team expansion or turnover since its 2021 founding.
The Green Fusion org chart
Paul Hock (CEO, Co-Founder) leads 38 mapped leaders with 6 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Operations 17 (+42% YoY), Business Development 17 (+55% YoY), Information Technology 15 (+67% YoY), Engineering 13 (+18% YoY), Sales 12 (+100% YoY), Marketing 6 (+100% YoY).
Talent flow
Green Fusion recruits heavily from energy and tech firms, with sonnen, XAnge, and Userlane as top talent sources. Technische Universität Berlin is its most prominent school, accounting for 10 of its 83 analyzed profiles. Alumni have moved to diverse roles at companies like Sony Interactive Entertainment and Enerithm.
Most common previous employers of Green Fusion staff: sonnen (6), XAnge (3), Userlane (3), Technische Universität Berlin (3), Enpal (3), ANDRITZ (2). Former Green Fusion employees most often moved to NILS Software (1), Enerithm (1), bespoke.berlin (1), LawX (1), Sony Interactive Entertainment (1), Germanlanding.de (1).
Web traffic
Traffic mix: 0% direct, 0% search, 0% social, 0% paid.
What this company is made of
Most common skills at Green Fusion: Project Management (39), English (31), Teamwork (26), Microsoft Office (26), Communication (22), Python (Programming Language) (22), Microsoft Excel (20), Sales (19).
Where the team actually sits
Green Fusion people are concentrated in Berlin, Germany (42), Germany (11), North Rhine-Westphalia, Germany (6), Berlin Metropolitan Area (6).
Search footprint
Green Fusion attracts about 1 organic search visits a month. It gained 1 ranking keywords and lost 0 in the last period.
What employees say
- Compensation
- 4.40 / 5
- Career opportunities
- 4.40 / 5
- Senior management
- 4.00 / 5
- Work-life balance
- 5.00 / 5
Frequently asked
Green Fusion has 111 employees as of September 2026.
Green Fusion has raised $16M in total, most recently a Series A round in January 2025.
Green Fusion was founded in 2021 by Paul Hock, Thomas Filkorn, Nina Germanus, Diane Roux, Matteo Zappulla.
Paul Hock (CEO, Co-Founder) sits at the top of Green Fusion's reporting structure, with 6 direct reports.
The most common previous employers of current Green Fusion staff are sonnen (6 people), XAnge (3 people), Userlane (3 people).
Former Green Fusion employees most often move to NILS Software (1), Enerithm (1), bespoke.berlin (1).
Green Fusion attracts about 1 organic search visits a month.
The most common skills among Green Fusion staff are Project Management, English, Teamwork, Microsoft Office, Communication.
Green Fusion staff are concentrated in Berlin, Germany (42), Germany (11), North Rhine-Westphalia, Germany (6).
Green Fusion has about 17 people in Operations, up 42% over the past year, as of September 2026.
Green Fusion has about 17 people in Business Development, up 55% over the past year, as of September 2026.
Computed from 83 current and 31 former Green Fusion profiles, as of September 2026. Source: Crustdata.
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