kopenkin dmitrii

jan 2026 — present · remote / spain

remote / spain

• ›I co-founded Salut and built the platform from the ground up. It's an ERP for independent supermarkets, covering POS, inventory, supplier ordering, catalog management, receipts, analytics, and admin workflows. About 15 business domains with tenant-scoped access control and generated API contracts.
• ›We went live with our first store in Barcelona this year. I'm the sole engineer in a team of three, so I own everything from the database schema through to the CI pipeline.
• ›One piece I'm particularly happy with is the catalog onboarding. Store owners were spending around ten minutes entering each product manually. I built an AI-assisted flow using the Vercel AI SDK, OpenFoodFacts, and automated background removal. Per-SKU onboarding dropped to about 30 seconds.
• ›On the hardware side, there's a native Electron desktop app that talks to ESC/POS thermal printers and cash drawers over USB. No driver layers, no middleware, direct integration with retail hardware in production. I'm currently adding a native RS-232 binding to support serial devices: 20x2 customer-facing displays, weighing scales, and barcode scanners.
• ›The whole thing runs on a Turborepo monorepo with 160+ test files, CI/CD on GitHub Actions, Docker, and GHCR.

#typescript#react#next.js#python#fastapi#go#supabase#electron

dec 2024 — dec 2025 · remote

remote

• ›I owned a CAD 2D/3D Model Viewer for Confluence. UI, embedded viewer, model catalogue, revision tracking, the lot. Started from a prototype and shipped it to Platinum status on the Atlassian Marketplace with 7,500+ organisations using it. It handled 70+ CAD formats.
• ›I also co-built the Jira version in a two-person team and led refactors on three other apps (Google Chat for Jira, MS Teams Connector, GitHub Links). Plus a couple months prototyping privacy-first AI features: PII filtering, relationship-aware access control, vector search.

#react#typescript#atlassian forge#aws#dynamodb#lambda

oct 2024 — dec 2024 · remote / andorra

remote / andorra

• ›A client needed an algorithmic trading bot for QUIK, the Russian trading terminal. I built it in TypeScript on top of Hono, with Lua glue for the terminal integration, real-time currency-pair arbitrage detection, position management, and a monitoring dashboard.

#hono#lua#react#typescript#sqlite

aug 2023 — oct 2024 · remote / toulouse, france

remote / toulouse, france

• ›Digikare makes digital care pathways for orthopedic surgery. I worked on Orthense, which is deployed in over 100 hospitals, and on Renacot, a version commissioned by the French government for CNP-COT.
• ›The interesting part was the ML. Surgeons photograph implants during procedures. I embedded a Keras model that pulls metadata straight off those photos and feeds it into the triage system. If the model is over 90% confident, it auto-approves. Below that, a human checks it. I also built the dashboard tracking how the model was doing: success rates, where it failed, confidence distribution. The AI features drove a 20% efficiency gain.
• ›DDD and CQRS on the backend, integrations with a government surgeon database, mailing, analytics.

#typescript#angular#nestjs#python#keras#postgres

may 2021 — aug 2023 · on-site / toulouse, france

on-site / toulouse, france

• ›I taught. About 150 students across first and second year, 90% of them stuck with it. Created and graded exams. The cohort I worked with saw a 30% bump in academic performance.

jan 2023 — may 2023 · hybrid / toulouse, france

hybrid / toulouse, france

• ›Built and led a small team to replace manual campus operations with software. Three platforms came out of it: event management, automated grading, and CTF infrastructure. Took the operational overhead down by about 50%.

#typescript#next.js#react#docker#gitlab ci#postgres

jan 2023 — may 2023 · hybrid / toulouse, france

hybrid / toulouse, france

• ›Contract work: built a job-dating platform for the campus that matched students with companies for recruitment events. Chat, profiles, job board.

sep 2020 — may 2021 · remote / paris, france

remote / paris, france

• ›Hospitalidee helps people find healthcare providers. Their database had no indexes. Large queries were doing full collection scans, so the search was crawling. I added proper indexes and rewrote the heaviest queries to pull only what they needed. Search got about 4x faster. Worked with the PMs on some UX changes that lifted engagement 30% and retention 10%.

#react#typescript#node.js#mongodb

sep 2016 — sep 2020 · remote / russia

remote / russia

• ›A mix of client work and my own projects over four years.
• ›The biggest client project was Tochno Pizza, a restaurant that needed online ordering wired straight into their IIKO POS system. Orders flowed in without anyone touching them. That drove about 20% more orders. I also rebuilt the responsive UX, cut bounce rate 40%, and doubled page-load speed. Built it three times over the years as my skills evolved, from WordPress to NestJS to Next.js.
• ›For other clients I built a bunch of static SEO-optimised marketing sites.
• ›On my own time, I ran a bunch of Steam trading bots and cross-site margin catchers. Automated bots that watched CSGO marketplaces and gambling sites, caught price differences between them, and traded on the spread. That one paid for itself.

#wordpress#php#javascript#mysql#react#typescript