Regrello
B2B SaaSInternationalization of an enterprise platform — static UI and millions of user-generated objects, translated with LLM support. Users across languages work seamlessly on the same data.
Experience. Clarity. Enthusiasm.
Frontend architecture that carries your product — delivered in person.
We have seen a lot and know the options: which paths carry — and which end in a dead end. The result is never an off-the-shelf solution, but the right combination of proven building blocks. Deliberately small: no juniors, no handover to third parties.
Book an intro callOur expertise
15 minutes, no strings attached — you talk directly to one of the two Sebastians. Prefer email? contact@sebastian-consulting.com
Trusted by teams at
24
Years of frontend and web experience
47
Projects delivered
37
Companies and brands served
Our approachThink clearly.
Think clearly.
Decide well.
Build to last.
We connect technical understanding with business goals and create clarity about feasibility, priorities and the path to success.
01
Understand
We ask the right questions and create clarity about goals, users and context.
02
Design
We design architectures that carry today and grow with you tomorrow.
03
Deliver
We deliver performant code and secure quality all the way to market.
Results that last.
Meet the two consultantsDWS Group
FintechInvestment platform for European and Asian markets. A resilient frontend architecture became a product that runs in more than ten countries today.
Heidelberg Materials
Industry · EnablementEstablished frontend architecture and enabled teams to deliver more consistently and faster — with standards the next team will understand, too.
Case study
How Regrello went multilingual.
For Regrello we internationalized an enterprise platform — static UI and millions of user-generated objects. The result: less performance risk, shorter development cycles and a developer experience that rolls out new languages in seconds.
View in profileScalable architecture
Modular structures for continuous growth.
Top performance
Fast delivery and stable user experiences.
Team Enablement
Sharing knowledge, establishing standards, increasing impact.
Our focus. Your advantage.
Strategy, technology and craft thought of as one — executed with precision.
Craft
React & Modern Web
React and TypeScript in enterprise settings — including the ecosystem decisions behind them.
Platforms & Products
Design systems, monorepos and platforms on which multiple teams deliver in parallel.
Performance & Quality
Core Web Vitals, bundle budgets and code standards — measured, not guessed.
Stewardship
Strategy & Architecture
Target picture, architecture decision and migration path — reasoned, documented, built to carry.
Enablement & Mentoring
Pairing, reviews and standards that stay when we leave.
Architecture Governance
Making architecture decisions traceable — reviews, ADRs, clear guardrails.
Two architects. Nothing in between.
Nobody off the bench, no juniors, no handover to third parties. You work with exactly the two architects who own your frontend — real project responsibility, verifiable experience, delivered together.
“We brought in Sebastian and his compatriot ‘the other Sebastian’ to internationalize our web application. Their solution was unbelievably elegant — and its DevX was unmatched.”
Chris Lewis — Founding Team, Regrello
“A top expert for web frontends, with an excellent overview of current technologies. His recommendations are always well-considered and justified in detail.”
Jochen Reinelt — Team Lead Software Engineering, EnBW
“It is very rare to find a senior JavaScript developer who can do large-scale architectural work, but also have enough artistic sense to rate the UX of an application.”
Paul Bakaus — Founder, ex-Zynga & Google
Let's talk about your frontend.
Let's talk about your goals, your challenges and the next level of your React architecture.
15 minutes, no strings attached — you talk directly to one of the two Sebastians.