01
Online stores and retail
You sell by phone and chat, and stock lives in notes. You need a store the owner runs from a phone.
Case: Online Shirt Store on Nuxt 4 with an Owner Admin Panel → Moscow · Chisinau · fully remote
DevUnit Lab
An engineering studio: bots, websites, automation, infrastructure and apps
31
case studies on the site: task, solution and stack
20
of them running in production
5
areas: bots, websites, automation, infrastructure, apps
Who we are
DevUnit Lab is an engineering studio. We build software and infrastructure that run without constant supervision: they take payments, keep records, repair themselves on a schedule and report when something goes wrong.
The studio is led by Anton Sergeev, a backend and infrastructure engineer. We work from Moscow and Chisinau, fully remote, in the GMT+3 time zone. This site is for clients in the US and the EU; clients in Russia and the CIS are served by devunit-lab.ru.
What we do
- Telegram and VK bots — billing and subscriptions, ticketing systems, document processing, loyalty programs, AI-powered bots.
- Websites and online stores — stores on Nuxt with a custom admin panel, WordPress storefronts, business cards, migrations from legacy CMSs.
- Automation and document processing — self-hosted n8n, CRM and marketplace integrations, calculation software.
- Infrastructure and networks — VPN for teams, servers for websites, self-hosted services, voice and streaming on your own server.
- Android and Windows apps — clients under your own name, self-updates, crash reports, Windows 7 support.
We also run our own product: a system for laser tag arenas with ESP32 firmware, a hub and an instructor panel.
How we work
- Before an estimate comes a short free audit: we look at the task and say what is worth doing and for how much.
- Code and data stay with the client. Everything is deployed in Docker on the client's server or ours.
- A project is handed over with documentation: a specification-style description and a version history.
- After handover there is a month of free support, then maintenance by agreement.
How we back it up
Every case study on this site is written from the project's repository: the task, the solution, how it works, the result, the stack and the version. Clients under NDA are described without names; our own products are named. Most development happens in private repositories; the studio's GitHub profile is github.com/ToshaToshiba.
Terms used in the case studies are explained in the glossary.
Our stack
What's under the hood — for those who care when choosing a contractor. Click a technology for a short explanation.
▸Backend & AI
▸Web
▸Apps
▸Servers & containers
▸Media & communications
▸Automation & VPN
▸Databases
▸Embedded & IoT
▸Monitoring & CI/CD
Questions about the technologies?
Open the glossary →Who we help
Find your situation and see the case where that problem is already solved.
Websites
02
Brands and product makers
Ads send people from the street to their phones. You need a light storefront with a catalog and ordering in a familiar messenger.
Case: WordPress Showcase Site with Ordering via VKontakte →03
Companies with a legacy website
The site runs on an outdated CMS, updates are risky and search rankings must survive. You need a migration that keeps the URLs.
Case: Joomla to WordPress Migration Without Losing Rankings →04
Independent professionals
You need one page instead of long explanations in chat: who you are, what you do and how to reach you.
Case: Business-Card Site for a 3D Printing Engineer →05
Subscription services
Payments are confirmed by hand and renewals live in a spreadsheet. You need a bot that takes payment, extends access and reconciles on its own.
Case: Tech Poly VPN: VPN subscription billing in Telegram →06
Internal IT departments
Requests arrive in DMs and hallways, and some get lost. You need ticket tracking, an asset register and a manager report without a separate system.
Case: Telegram ticketing system for an IT department →07
Clubs, salons and service businesses
You need a loyalty card with no plastic and no app: visits, rewards and records right in Telegram.
Case: Loyalty card for a gaming club in Telegram →08
Agents who work with documents
The same document is edited by hand for every client. You need PDF processing that leaves the data and the signature intact.
Case: Branding e-policies (OSAGO) with a Telegram bot →09
Marketplace sellers
Delivery slots are gone in minutes, and stock and orders are checked by hand. You need monitoring and automatic alerts.
Case: Telegram bot for Wildberries delivery slots →10
Small businesses taking leads in a messenger
Leads from Telegram are copied into the CRM and a spreadsheet by hand. You need a pipeline where the data moves itself.
Case: Lead automation on n8n: Telegram, CRM and Google Sheets →11
Manufacturing companies
Calculations are done by hand from tables and standards. You need software that always calculates the same way and is covered by tests.
Case: FEFCO box die-line calculation in C++ →12
IT companies and distributed teams
Work tools stopped opening and everyone has a different workaround. You need shared access on your own server.
Case: Corporate gateway on Xray and nginx for an IT team →13
Companies with several websites
Sites share a server with other services and get in each other's way. You need a dedicated server with isolation, certificates and backups.
Case: A private server for several websites on Docker and nginx →14
Gaming cafés and LAN centers
Games, launchers and Discord must open on every machine without lag. You need a VPN for the venue with split tunneling: games go direct, everything else through a secure channel.
Case: OshaVPN: VPN client for Android, Windows 10/11 and Windows 7 →15
Teams that need their own communications
You need voice, chat and streaming on your own server, with roles and closed access, and no third-party cloud.
Case: Peregovorka (ToshaStream): streaming server and team voice chat →16
Services that need their own app
A third-party client scares users with settings. You need an app under your own name with one button and self-updates.
Case: OshaVPN: VPN client for Android, Windows 10/11 and Windows 7 →17
Companies with a fleet of old PCs
Some machines still run Windows 7 and modern software will not install. You need a separate client for the old system.
Case: OshaVPN: VPN client for Android, Windows 10/11 and Windows 7 →Shall we discuss your task?
A short review is free: we'll look at the task and tell you what's worth doing and roughly for how much.