Lean Core
Focused multidisciplinary builders—not bloated layers.
We design, build & ship digital products that users love and businesses rely on.
We started !404developers after seeing founders & teams burn time and budget on clunky builds, unstable infra & design that didn’t convert. We believed there was a better way—lean squads, clear communication, obsession with performance & outcomes.
Today we operate as an extension of your team: strategy, UI/UX, engineering, deployment & iteration under one roof.
Focused multidisciplinary builders—not bloated layers.
Your roadmap becomes ours; we surface risks early.
From UI polish to infra reliability & observability.
Support, optimization & iteration loops 24/7.
Rapid alignment: goals, constraints, success metrics.
Tech choices mapped to scale, speed & maintainability.
Wireframes → high‑fidelity UI → interaction refinement.
Incremental delivery across FE, BE, infra & integrations.
Performance, accessibility & security baked in.
Monitoring, iteration loops & growth experiments.
Smartt approached us with a broken MVP, unstable backend & poor retention. We rebuilt the platform for performance & trust.
React, Node, PostgreSQL, Redis, Docker, CI/CD.
UX flow, scalability, error budgets, analytics.
Retention lift & investor confidence for next phase.
Ship fast to learn, decide with data.
Accessible, performant & maintainable.
We solve root problems, not inflate scope.
Systems prepared for change & scale.
Let’s turn your idea or stuck build into something users actually love.