01
Software Development
Web apps, backends, and internal tools, designed and shipped end to end. Production systems, not prototypes that stall after the demo.
ReactNext.jsNode.jsTypeScript
Founder-led. Currently booking new engagements
We build products.
We prove they work.
err is a founder-led software and BI studio. We build the product, then build the numbers that show it's working. One team, start to finish.
Pevent · users0 → 16k+
16,247
Zero to 16,000+ users. Zero paid acquisition.
Pevent, built by err
How we ship
2-wk
Discover✓ On track
Build✓ On track
Scale✓ On track
What we do
Three disciplines. One studio that ships.
err is founder-led. You work directly with the person building it, no account managers, no hand-off chain.
02
Mobile App Development
iOS and Android apps built to ship, from first screen to App Store, backed by the same backend and data discipline as everything else we build.
React NativeiOSAndroid
03
Data & BI
A diagnostic engagement that finds exactly where you're leaking revenue or flying blind, then the dashboards and pipelines that close the gap.
Data auditsWarehousingDashboards
How we work
A rhythm designed to remove surprises.
01
Discover
One week of interviews, audits, and demos. You leave with a written plan, no strings.
02
Build
Two-week sprints, live demos, shared Linear, Slack channel. You watch it come together.
03
Scale
We hand off with docs, playbooks, and an on-call cadence. Or we stay embedded, your call.
Proof of work
We built Pevent from zero to 16,000+ users.
Pevent is an event ticketing platform we designed, built, and scaled: from an empty repo to over 16,000 users and hundreds of live events, on organic growth alone. No paid acquisition, no growth hacks.
16,000+
Pevent users
300+
Events hosted
$0
Paid acquisition
1
Founder-led studio
ReactNext.jsNode.jsTypeScriptPrisma
Who we are
err is a founder-led studio. The founder is a full-stack engineer with fintech experience (React, Next.js, Node.js, TypeScript, Prisma) who built Pevent from scratch to 16,000+ users. err applies that same discipline to your business: ship the product, then build the visibility to run it well.
Let's talk
Got something ambitious? Let's build it.
Tell us what you're working on. We reply within one business day with next steps, or an honest "not us."