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ANGUS UELSMANN

I build secure systemsfast APIsclean backendslasting software

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IamAngusU Germany

About

Backend-first.
Shipped end-to-end.

I work backend-first. Hardened APIs, proper access control, encryption where it actually matters, and a frontend that doesn't feel bolted on. I care about code the next person can read without a 30-minute onboarding.

Over the years I've shipped monitoring infrastructure, real-time event systems, data preservation networks, and emergency alert platforms. All of it running in production.

Read the Insights
40+ Projects shipped
17+ Years building
100% Production-grade
0 Compromises on security & privacy

Stack

Tools I reach for

Selected work

Things I've built

01 Compliance · SaaS hinschg‑portal

hinschg‑portal

from $29 / mo

Whistleblower platform for German companies that need to be HinSchG-compliant. White-label multi-tenant, anonymous two-way messaging, AES-256-GCM encryption, zero-log architecture, and EXIF-stripped uploads. Goes from signup to legally compliant in under five minutes.

PHPMariaDBAES-256Multi-Tenant
02 Data Integrity · P2P ongrnd

ongrnd

free for providers

Cryptographic backup verification over an encrypted P2P mesh. Each file is hashed with SHA-256, SHA-1, MD5, and CRC32 simultaneously, then cross-checked across nodes. HWID-bound identities, invite-only access, no central server.

RustP2PAES-256-GCMSHA-256
03 SaaS · Booking safegate

safegate

Booking and OTP verification for discreet service providers. Clients pay via Stripe, receive a 6-digit code, and redeem it on arrival. No personal data stored, neutral bank statement entry. Free for providers.

PHPStripeOTPMariaDB
04 SaaS · WMS storagenow24

storagenow24

free – $149 / mo

Warehouse management SaaS with live occupancy heatmaps, AI-assisted slot assignment, and a rental marketplace for unused space. Drag-and-drop floor planner, yard and ramp control, multi-tenant with a full audit trail.

PHPMariaDBHeatmapMulti-Tenant
05 Alert System · Push westerwarn

westerwarn

$9.99 one-time

Emergency alert platform for the Westerwald region. VAPID Web Push, live Leaflet.js maps, Server-Sent Events for instant broadcasts, and an offline service worker cache. Built to move fast when seconds matter.

PHPMariaDBWeb PushVAPID
06 Tool · Desktop + Web filebeam

filebeam

Drag a file in, scan the QR code on your phone, done. FileBeam moves files peer-to-peer over your local network at full wire speed. No cloud, no account, no file size limit. Windows app with a browser-based receiver for any other device.

Node.jsWebSocketQRLAN
07 Tool · Audio audiomatrix

audiomatrix

Audio routing engine for Windows, written in Rust on WASAPI. Route any app to any output, dial in a 3-band EQ, compressor, and noise gate per channel, and control it all from a PWA on your phone over LAN. Single .exe, 1.8 MB, no installer.

RustWebSocketPWAWindows
08 AI · Desktop visionsort

visionsort

Stop naming screenshots manually. VisionSort scans a folder, sends each image to a local vision model via Ollama, and suggests descriptive filenames. Review in a clean UI, bulk approve, undo anytime. Fully local, no uploads, no API keys.

PythonOllamaLocal AIWindows
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Have something
worth building?

Got something you want to build? I take on a few projects a year, the kind where the engineering actually matters. Tell me what you're working on.