From September 2022 to October 2023
Sonic Team
Portrait of a team member
Portrait of a team member
Portrait of a team member
Portrait of a team member
Portrait of a team member


Sonic partnered with Enter to rapidly develop their home retrofitting web application, enabling homeowners to access personalized energy efficiency recommendations. This collaboration resulted in a scalable technology setup, a strong product and tech strategy and a significantly expanded product portfolio, driving Enter's expansion and raising $20 million in Series A funding.


Product Management
Product Strategy
Backend Development
Engineering Strategy
Web App Development

Our Work

In the Summer of 2022, the Enter leadership team recognized the need to shift towards more scalable, self-serving processes for their energy auditing services and partnered with Sonic to develop their core product, a customer-facing Enter portal. The Sonic team quickly discovered, scoped, and built the first iteration of the portal, allowing homeowners to access personalized recommendations for improved energy efficiency in their homes. Since the beginning, we crafted a highly complex, scalable technology setup around the systems needed to power Enter's application. A seamless user experience in onboarding new customers is as critical as high accuracy in the complex calculations the system produces at a rapid pace with dynamically changing data. Today, Sonic works with Enter to build an outstanding consumer product, scale their infrastructure in the face of starkly rising demand for Enter’s services, and support the team with product and engineering recruitment.

Project Outline

“We have been truly excited about our partnership with Sonic. Their entire team is highly professional and goes above and beyond to build the best possible product experience for our customers. Their help has been invaluable as we have been shifting towards more scalable, technology-driven processes and prepare for the next stage of growth and we are looking forward to continuing our partnership into the future.“

Justus Menten
Co-Founder & CEO at Enter

About Enter

Enter provides out-of-the-box energy audits, procurement, financing and benchmarking for electrifying and heating European homes to make homeowners independent of gas, oil and electricity. Recently, Enter raised $20 million in a Series A funding to scale its operations and enable house owners to work towards the 1.5-degree goal. Since its foundation in 2020, Enter has completed more than 3000 projects Germany-wide and is now significantly expanding its operations.