We build production systems —
not just software.
Marcellis is a full-stack web and mobile engineering studio focused on shipping durable, scalable systems — from first architecture decisions through long-term growth.
Build in motion
We don’t jump straight to code. Each phase compounds the next — reducing risk while increasing speed.
- • Clarify goals, constraints, and risk
- • Map users, systems, and data flows
- • Define success beyond launch
Stack philosophy
Tools are decisions. We choose stacks based on constraints, longevity, and the realities of shipping and maintaining software.
We favor modern, typed frameworks that optimize for user experience, performance, and long-term maintainability.
- • Product-facing applications
- • Performance-sensitive UIs
- • Design systems that must scale
- • Simple marketing pages with no interaction needs
- • Projects where long-term ownership isn’t required
Case signals
Not case studies — signals. These examples illustrate how we approach real constraints and tradeoffs.
A product team needed to launch quickly without locking themselves into a fragile architecture.
Small team, evolving requirements, and no tolerance for a rewrite six months later.
Modular system boundaries that allowed rapid iteration early and stability as usage increased.
An internal tool had become slow, unreliable, and difficult to extend.
Business operations depended on it daily — downtime was not an option.
Incremental replacement of critical paths, improving reliability without halting operations.
A consumer-facing app experienced unpredictable traffic spikes.
Performance mattered, but infrastructure costs needed tight control.
Systems designed to scale predictably under load while remaining cost-aware during normal usage.
Software is a long-term decision.
Most problems don’t come from choosing the “wrong” tool — they come from skipping the thinking that should have happened before the first line of code was written.
We believe great systems are the result of clear constraints, deliberate architecture, and disciplined execution over time.
Our job isn’t to chase trends. It’s to help teams ship software that still makes sense a year from now.
Start a build
Tell us what you’re building and how you’d like to be contacted.