Senior full‑stack, workflow-first
Stefan guwAPI
Workflow systems teams can trust
I build workflow software that stays reliable as it grows—clear states, backend-enforced rules, and access control done right.
Capabilities
I build web applications and systems end-to-end—frontends, backends, data models, integrations, and the rules that make the product reliable.
Web applications & platforms
Custom web apps with real workflows, permissions, and backend-enforced rules—built to scale beyond “just a landing page”.
Integrations & automation
Connect the systems you already use: auth, payments, CRMs, analytics, webhooks, internal tooling, and reliable data flows.
AI features (when it fits)
AI-assisted workflows with guardrails: structured capture, classification, summarization, and human-in-the-loop review when correctness matters.
If you have a workflow, roles, and data rules, we can scope a build that fits your domain—no boxed packages.
Featured Work
Systems, platforms, and tools with backend-driven logic
Want something similar for your team?
Process
A clear, lightweight process that keeps scope tight and delivery predictable.
Clarify
We align on what you need, what success looks like, and what’s in/out of scope.
1–2 daysPlan
I propose the pages, main features, and timeline. You approve before we build.
2–4 daysBuild
I implement it in small milestones. You review progress and give feedback.
1–3 weeksLaunch
We go live, fix any last issues, and I hand over everything you need.
2–5 daysAbout Me
I’m a full-stack developer focused on workflow-driven applications—systems where correctness, traceability, and data integrity matter as much as the UI.
I build end-to-end: database design, backend APIs and rules, permissions, and the frontend that operates inside those constraints. I’m most effective on internal tools and product backends with lifecycle states, review gates, and “must be right” business logic.
System Design
Clear entities, boundaries, and lifecycle states
Data Integrity
Constraints, permissions, and backend enforcement
Traceability
Audit logs, history, and explainable changes
End-to-End Ownership
DB → backend → UI, shipped and maintained
Start a Project
If you’re building a product or internal system with real workflows and data rules, send a brief. I’ll reply within 24 hours.
Prefer a quick chat?
Book a short call to align on workflow, roles, data model, and constraints.