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 product studio helping businesses and organisations turn important ideas, opportunities, and problems into digital products — from figuring out what to build to getting it into the hands of real users.
Product strategy · Software · Mobile
Pevent · users0 → 16k+
16,247
Zero to 16,000+ users. Zero paid acquisition.
Pevent, founded by ERR's founder
How we ship
2-wk
Discover✓ On track
Build✓ On track
Scale✓ On track
Clients & partners
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
Pevent proved the discipline, before ERR existed.
Pevent, founded and grown by ERR's founder, from zero to 16,000+ users and 400+ live events, on organic growth alone, no paid acquisition. Building and operating Pevent (not just shipping it) is what shapes how ERR approaches every product we build.
16,000+
Pevent users
400+
Events hosted
$0
Paid acquisition
1
Founder-led studio
ReactNext.jsNode.jsTypeScriptPrisma
Who we are
We believe building software is only part of building a product. ERR brings together product thinking, engineering, and a bias toward learning from real users to help businesses build things that matter. That approach comes from experience — including our founder's work building and operating Pevent, which grew from zero to 16,000+ users without paid acquisition.
Contact
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."