Custom software that fits your business, not the other way around
I build web applications, iOS apps, internal tools, and integrations for businesses that need more than off-the-shelf SaaS. Scope is locked, pricing is fixed, and delivery is typically 2-4 weeks. Work directly with the engineer who designs and builds it.
Why custom software vs. off-the-shelf tools
Custom software is built around your process, not a vendor's generic checklist. It integrates more cleanly with the tools you already run, costs less to operate long-term, and gives you a competitive advantage that a SaaS product can't replicate. You own the code and the outcome.
Off-the-shelf tools work fine for common problems. But if you're doing something unique — managing a proprietary workflow, integrating multiple systems, or moving fast in a competitive market — custom software is the right move.
What can we build?
Custom CRMs
A customer relationship system tailored to your sales process, integrations, and data model — not a generic SaaS template.
Web applications
React/Next.js applications and dashboards that run entirely on your terms: client portals, internal tools, data platforms.
Native iOS apps
SwiftUI apps for iPhone and iPad — shipped to the App Store or deployed as internal tools for your team.
Internal tools & dashboards
Audit dashboards, data management interfaces, and admin tools that save your team hours per week.
API integrations
Connect the systems you already use — billing, email, payment processors, analytics — without manual work.
Database design & migration
Postgres/Supabase schemas, data pipelines, and migrations that scale without technical debt.
Tech stack:
Why work with Zachary Vorsteg
I'm a software engineer and AI systems architect, and the founder of CustomLab.ai. I've shipped 50+ production systems running 24/7 — including Trusenda (live on the App Store), BidPro (iOS bidding platform), and dozens of internal tools and integrations for clients nationwide.
- You work directly with the engineer who designs and builds your software — no account managers or middlemen.
- Scope and pricing are locked up front with fixed delivery dates. No scope creep, no surprise bills.
- 2-4 week typical delivery. Built on proven tech: React, Next.js, SwiftUI, Postgres.
- Systems engineering discipline: your software is built to last, monitored, and maintainable.
- You own the code. Full source code handoff; no vendor lock-in.
Frequently asked questions
What is custom software development?
Custom software is an application built specifically for your business, designed around your process rather than forcing your work into a vendor's mold. Custom software fits better, integrates more cleanly, costs less to operate long-term, and doesn't lock you into a platform you don't own.
When do I need custom software instead of off-the-shelf SaaS?
When off-the-shelf tools don't fit your process, require expensive customization, or force you to change how your business works. Custom software is a strong fit when you're doing something unique, integrating multiple systems, or need a proprietary advantage that SaaS tools can't provide.
How long does a custom software project take?
Typical projects deliver in 2-4 weeks. Scope is locked up front with fixed pricing, so you know the timeline and cost before work begins. The tech stack — React, Next.js, Node, SwiftUI, Python, Postgres — is chosen to ship fast without cutting corners.
Who is Zachary Vorsteg?
Zachary Vorsteg is a software engineer and AI systems architect in West Palm Beach, FL. He's shipped 50+ production systems running 24/7 — including Trusenda (a CRM live on the App Store) and BidPro (an iOS bidding platform). He works directly with clients, with no account-manager layer.
Build software that's actually yours
Tell me what you're trying to do and where off-the-shelf tools fall short. If it's a good fit for custom development, I'll show you the scope, timeline, and cost up front.
Start a project