vemid.soft
Let's talk +
Vemid Soft / Mladenburg / est. 2017

Software

for
the
operations

no
one
writes
about.

B2B · ERP · Android.

Razgovarajmo+
Retail+ Logistics+ Warehousing+ e-Invoicing+ POS+ ERP+ Retail+ Logistics+ Warehousing+ e-Invoicing+ POS+ ERP+
[01] Services

Six things.
Done well.

01
Custom B2B systems
Internal portals, dashboards, workflow tools — replacing the spreadsheet and the Outlook chain.
→
02
ERP & legacy integration
Informix, MySQL, Exasol, multi-tenant routing. The ugly stuff that keeps the lights on.
→
03
Industrial Android
Kotlin on Sunmi / Honeywell. Barcode, ZPL labels, document verification. Built for the floor.
→
04
Backend APIs
Spring Boot, FastAPI. JWT, Swagger, a real deployment story — not a README and a prayer.
→
05
Automation
n8n, Microsoft Graph, SMS / Viber. Connective tissue. Often the highest-ROI work in the building.
→
06
Serbian SEF e-invoicing
UBL 2.1, eOtpremnica. Full compliance with the April 2026 amendments. We get called when it breaks.
→
[02] Selected work

Five systems.
In production.

01 / 2024 →
Spring Boot Informix JWT Nginx

Multi-tenant
Retail API

One Spring Boot service. Four brands. Forty stores. JWT-resolved tenants, dynamic Informix routing, two Tomcats behind Nginx.

Outcome
−92%
tenant-aware bug tickets
p95 84ms / 24h
02 / 2023 →
Kotlin Sunmi L2S ZPL Citizen SDK

Android
warehouse app

Goods-in on a handheld, not a cart-mounted desktop. Native barcode, ZPL through Citizen / Brother SDKs. Offline queue, optimistic UI.

Outcome
−60%
transaction time
8h shifts · daily
03 / 2024
React · Vite FastAPI · OCR MySQL SEF · UBL 2.1

Document
flow portal

HQ ↔ 40 stores ↔ central warehouse. Goods-receipt, transfers, invoices. OCR for legacy fax-quality scans. e-invoicing every 30 minutes.

Round-trip
3 days
14 min
median · month-end
04 / 2024 →
n8n MS Graph SEF SMS / Viber

Automation
suite

A dozen self-hosted n8n flows. COD reconciliation, O365 triage, e-invoicing, SMS proxy, backup alerting. Versioned in git, every run observable.

Returned to the business
~3
FTE-weeks / month
11,400 runs / 6 mo
05 / 2023
Proxmox ZFS MikroTik LACP

Infrastructure
rebuild

HP DL380 Gen8 from scratch. ZFS mirror on enterprise SSDs for the Informix VM. Separate ZFS pool for backups. LACP to a MikroTik CRS326.

p99 read latency
99×
improvement on hot path
1840ms → 19ms
[03] How we work

No slide decks.
No account managers.
No bullshit.

+

Production code, week one.

A small working slice in a real environment. Not a 60-page Miro board.

+

You email the engineer.

No proxy. The person reading your schema is the person you reply to.

+

Boring tech. Ten-year stack.

Spring Boot over the framework du jour. Postgres over the latest distributed thing.

+

We don't ghost.

Every system we've built is still in production. We maintain or hand over cleanly.

+

We say no.

Mobile games, consumer social — not us. Small list, on purpose.

+

Bill the work, not the meeting.

Fixed-price for defined slices. Day rate for ongoing. If it can be an email, it will be.

[04] Stack

What we
actually use.

a / Backend
  • +Spring Boot · Java
  • +Python · FastAPI
  • +PHP · Phalcon
  • +Node.js
b / Mobile
  • +Kotlin · Android
  • +Sunmi · Honeywell
  • +Citizen & Brother SDK
  • +ZPL
c / Frontend
  • +React · Vite
  • +TypeScript
  • +Tailwind
  • +Electron
d / Data
  • +IBM Informix
  • +MySQL · Postgres
  • +Exasol
  • +Power BI · Talend
e / Automation
  • +n8n
  • +Microsoft Graph
  • +Serbian SEF · UBL 2.1
  • +Viber · SMS
f / Infrastructure
  • +Docker
  • +Proxmox · ZFS
  • +MikroTik · WireGuard
  • +Nginx · MinIO
[05] About

One engineer.
That's the pitch.

Marko / founder
photo · forthcoming
Mladenburg · 2026

Marko. Faculty of Mathematics, University of Mladenburg. Sysadmin → backend → CTO. Currently CTO of a 40+ store retail group across Serbia, BiH, Montenegro.

VemidSoft is the side that takes outside work. Small client list on purpose. Direct line, every time.

GitHub → LinkedIn →
[06] Contact

Tell us what's
broken.

Office
Mladenburg, RS
Vemid Soft · MB 64609793
Reply within
48 hours
No NDAs needed at this stage.