Business systems we delivered directly, enterprise solutions we helped build, our own services, games and developer tools, and earlier C/C++ career work from before Addsoft was founded. Client and product names are left out. Ask us if you'd like more detail on any of them.
Client project2026
After-service management system
A B2B system where headquarters, distributors and service centers handle after-service intake, assignment, processing and settlement in one place — with a different view and different editable fields per role.
Three-tier permission model with field-level locking
Token-based mobile intake for non-logged-in field staff
Settlement gated on waste-material return
Stack
ASP.NET Core MVC
EF Core
MySQL
log4net
Docker
Contributed2026
Multi-tenant SaaS groupware with single sign-on
Groupware shared by many companies from a single deployment. It also acts as the identity provider, so the scheduling, warehouse and other services under the same company domain share one sign-in.
Tenant middleware isolates each company's data per request
Built an OIDC identity provider; connected services get SSO with just-in-time provisioning
Mail accounts wired to a Postfix · Dovecot · Rspamd stack through database views
Stack
ASP.NET Core 10
EF Core
MySQL 8
OpenID Connect
Docker
xUnit
Contributed2026
Team scheduling SaaS
A scheduling service with calendars, recurring events, room and resource booking, and email reminders. Code and database are kept separate so it sells both as a groupware add-on and as a standalone install.
RRULE recurrence with per-occurrence exceptions and this / following / all edits
Overlap checks and an approval flow for resource booking
Outbox table plus background worker for reliable mail, with ICS and webcal feeds
Stack
ASP.NET Core 10
EF Core
MySQL 8
OpenID Connect
MailKit
xUnit
Contributed2026
NFC-based on-site safety inspection system
A web system and Android app where tapping the NFC tag on a piece of equipment opens its inspection form directly. The core is secure-tag verification that stops cloned tags and reused URLs.
NTAG 424 DNA SUN message verification with tag counters to block replayed URLs
Android app uses NFC foreground dispatch and App Links to open inspections without a chooser
FCM HTTP v1 push relayed from a single notification service for due and missed checks
Stack
ASP.NET MVC 5
Entity Framework 6
Autofac
Capacitor
Android
FCM
Contributed2026
E-commerce and marketplace platform
A commerce platform covering the whole storefront lifecycle — products, orders and payment through cancellation, refund, return, exchange and delivery tracking. The live database was migrated from MSSQL to MySQL.
Payment gateway integration with full order state transitions
Carrier-webhook delivery tracking with FCM and KakaoTalk notifications
Hangfire background jobs and Kakao / Naver social sign-in
Stack
ASP.NET MVC 5
Entity Framework 6
MySQL 8
Hangfire
FCM
Contributed2026
Warehouse management system (WMS)
A warehouse system connected to the storefront by API. Every stock movement — receiving, shipping, transfers, cycle counts — is written to a ledger, and concurrent edits to the same stock never drift.
Every stock change recorded in a ledger, including the resulting balance
Optimistic locking on MySQL — versions bump at save time; conflicts re-validate and retry
Stock reservation API for the storefront, Code128 barcodes and PDF output
Stack
ASP.NET Core 10
EF Core
MySQL
Autofac
Serilog
xUnit
Contributed2026
Asset management web service with a one-click installer
An on-premise web service installed on the customer's own server. A single setup file takes a fresh Windows server from IIS configuration through database install and initialization to a running web app, and updates are automated the same way.
Inno Setup + PowerShell: enable IIS → install MySQL → initialize and migrate DB → deploy site → health check
Update installer: back up → deploy → migrate → restart → verify, with automatic rollback on failure
Schema versioning per installation through EF6 migrations
Stack
ASP.NET MVC 5
Entity Framework 6
MySQL 8
IIS
Inno Setup
PowerShell
Contributed2026
Bidding workflow automation desktop app
A Windows app that gathers bid notices from several procurement sites and automates repetitive data entry. It connects to a web service by API key and ships as a ready-to-run installer with its own update channel.
Per-site collection and entry automation with Selenium and a bundled Chrome
Self-contained build, per-user install without admin rights, first-run setup wizard
Update feed with a SemVer policy, API-key authentication and sign-in auditing
Stack
.NET 8
WinForms
Selenium
Inno Setup
Contributed2026
On-premise document search AI (RAG)
A document search and question-answering system that never sends company documents to an outside cloud — it runs entirely on an in-house LLM and vector database.
Local LLM and embedding models over an OpenAI-compatible API with Qdrant vector search
OCR (Tesseract) fallback for scanned PDFs and table-aware chunking
Separate database for personal data and a cap on concurrent LLM requests
Stack
ASP.NET Core 10
Qdrant
Local LLM
Tesseract OCR
Docker
Own product2026
InfraWatch — certificate, domain and mail server monitoring
A monitoring service that checks live domains and web and mail servers on a schedule, and emails you before an SSL certificate or domain expires or as soon as a mail server misbehaves. We run our own servers on it.
Checks SSL certificates, domain expiry, DNS records, SMTP / IMAP / POP3 responses and RBL listings
An agent on the mail server pulls jobs over a web API to watch the Postfix queue and Rspamd from inside
Alert rule engine — sends only on state changes, retries failures and mails a daily summary
Stack
ASP.NET Core 10
Worker Service
EF Core
MySQL
MailKit
Tailwind CSS
xUnit
Own product2026
Multi-site blog platform
The blog platform behind Addsoft's tech blog and a separate economics blog — two sites from one codebase. Writing, search optimisation, ad revenue and visitor analytics are all built and run in-house.
Per-domain site profiles — one codebase runs several blogs with their own owners, databases and branding
Markdown editor with scheduled publishing, plus automated SEO: OG, JSON-LD, sitemap and RSS
Publishing API, AdSense API revenue dashboard and ad placement, and bot-filtered visitor analytics
A Windows desktop app that stores the commands you use most and finds and copies them from any app with a single hotkey. Distributed for free from our Tools page.
Quick-search popup on a global hotkey, with tag and language filters and relevance ranking
{{variable}} placeholders filled in at copy time, remembering the last value
Runs as a single exe with no installer, in English and Korean
A web service that collects recipes, plans a month of meals and turns the plan into a shopping list. Planned, built and operated in-house.
Monthly meal calendar with automatic shopping-list generation
Membership built on ASP.NET Core Identity
Shipped to Android via TWA packaging
Stack
.NET 9
ASP.NET Core MVC
MySQL
Tailwind CSS
Alpine.js
Own product2026
Sucker Mart
An idle shop-management simulation set at a dungeon entrance, where adventurers are the customers. A non-combat title released on Android.
Idle management loop and pricing system design
Unity 6 2D URP, optimised for portrait play
Code-driven art to minimise asset dependencies
Stack
Unity 6
C#
2D URP
Android
Own product2026
Neon Dive
A casual arcade game where you dodge falling neon blocks and score more the closer you graze them. Every visual is drawn in code, with no external assets.
Scoring built around a near-miss bonus
Star-currency skin shop
Runtime-generated graphics keep the build tiny
Stack
Unity 6
C#
2D URP
Android
Own product2026
WhoPays
A local party game passed around a single phone — whoever loses buys the coffee. Two to eight players.
Local multiplayer flow for 2-8 players
UI designed for portrait mobile only
No sign-up — playable the moment it installs
Stack
Unity 6
C#
2D URP
Android
Career2016–2017
VR video player and content protection
Built a VR video player in Unity single-handedly, and ran a content copyright-protection product as PM — planning, proposals and schedule.
Unity-based VR video player, developed solo
PM for a content copyright-protection product (planning, proposals, consulting)
Survey app development
Stack
Unity
C#
VR
Career2013–2015
Windows security products and kernel drivers
Developed a new cross-domain transfer product for separated networks and took it through Common Criteria certification. Also built kernel-level file-system drivers to find system performance bottlenecks.
New cross-domain transfer product and Common Criteria certification
WPP tracing to collect and merge logs across virtually separated networks, cutting debug time
WDF file-system minifilter driver to locate slow file-access paths
Stack
C
C++
Windows Driver (WDF)
Minifilter
WPP
Career2010–2016
SNMP-based network management system (NMS)
Developed and extended a network management system that monitors devices over SNMP and detects and reports faults, and took part in building an NMS for a large institutional network.
Extended Syslog and SNMP trap collection with a fault-event correlation engine
SMS alerting on network faults
Configuration and performance collection engine for L4 switches
Stack
C++
SNMP
Syslog
Windows
Career2010–2013
Telecom and power equipment management engines
Built the C++ server engines behind management systems for LTE equipment, IP telephony, broadcast equipment and power facilities, with C# WinForms clients for operators.
LTE equipment management — performance, configuration and backup engines plus remote terminal
IP telephony management engine (SOAP + SNMP) and CMTS broadcast-equipment query engine
Power management product: C++ server, C# client and customer support
Stack
C++
C#
WinForms
SNMP
SOAP
Career2008–2010
Digital camera test automation and video integration
Developed test-automation software for a digital camera manufacturer and supported it on site. Also ported a CCTV camera SDK into a video monitoring tool.
Test automation driven by camera video captured through DirectShow
Windows test software in C/C++ and Visual C++
Integrated a CCTV camera SDK into a monitoring tool; on-site support
Stack
C
C++
Visual C++
DirectShow
Windows
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