I combine hands-on engineering work with leadership. From being the technical force on your team to managing your entire engineering organization, I scale to match your needs—and can step into a fractional CTO role as you grow.
I'm an engineering leader who stays hands-on. I don't just manage from above—I ship code, mentor developers, and drive technical direction. With 24+ years building web applications, I've learned that the best leadership combines deep technical skill with the ability to develop strong teams.
My background is rooted in open-source e-commerce (Spree, Solidus) and has evolved into building products at scale—from bootstrapped startups to high-growth platforms like Glossier and VitaminLab. I've learned to speak both the language of engineers and the language of business, bridging gaps and getting things shipped.
Whether you need a staff-level engineer who can also manage a team, technical guidance, or someone to lead your entire engineering function, I adapt to what your organization needs.
Designing scalable, maintainable architectures. Rails conventions, service objects, background job processing, database optimization, API design.
Deep expertise in the idiomatic Rails way. Boring Rails advocate: Hotwire, Stimulus, Turbo Frames, server-rendered HTML, testing strategies, and best practices.
Building and scaling high-performing engineering teams. Hiring, mentoring, technical culture, and creating systems that enable teams to ship quality work.
As a fractional CTO, I help organizations navigate technical decisions, roadmaps, and modernization efforts aligned with business goals.
Deep expertise in Spree and Solidus. Early Spree adopter (2008), core team member, extension author. Building scalable commerce systems, payment integration, and fulfillment workflows.
Identifying bottlenecks, optimizing slow queries, improving API response times, and monitoring in production.
SportsKey, Dublin (Remote)
Leading the engineering team while remaining deeply involved in product development and technical decisions. Blending hands-on development with team leadership.
Dinck BV, Netherlands
Building a new venture while maintaining advisory and consulting relationships.
VitaminLab, Remote
Led engineering team and oversaw technical architecture and platform performance at a personalized nutrition company. Progressed from Chief Happiness Officer to Principal Engineer.
Glossier, Engine eCommerce, Nerds & Company
Specialized in e-commerce development and operations. Set up CXOps squads, created workflows and processes, and built backend systems for high-volume platforms.
Spree Commerce, Stembolt, Dynamo
Senior Developer and Technical Account Manager at Spree Commerce. Contributed to open-source e-commerce while building deep Rails expertise and learning to bridge technical and customer needs.
24+ years of consulting and product engineering. Founder of Peter Berkenbosch Consultancy B.V. Full career history available on LinkedIn.
I join your team as a hands-on technical leader. I write code, do code reviews, mentor developers, and guide technical decisions—all while helping the team scale.
For growing companies, I provide strategic technical leadership. Setting technical direction, overseeing architecture, building your engineering function, and aligning tech with business goals.
Evaluate your systems, identify bottlenecks, and recommend improvements. I provide specific, actionable guidance on scaling, performance, and code quality.
Help you hire the right engineers and build a strong technical culture. I develop hiring processes, conduct technical interviews, and mentor growing teams.
I was an active contributor to the Solidus ecosystem and served as a member of the Solidus Stakeholder Team. While I've moved on to new ventures, I remain passionate about the open-source e-commerce community and the projects I built during my time with Solidus.
Solidus is a powerful open-source e-commerce framework trusted by high-volume stores worldwide.
View my work and past contributions on github.com/peterberkenbosch.
Whether you need an engineering leader who codes, help scaling your team, or technical direction as you grow, I'm ready to discuss the right engagement for your situation.