Serge Lubimoff
Senior Software Engineer | AI, Cloud & Web3
Node.js · AWS · Local LLMs · Author of Me2eM Identity Protocol
About Me
I architect scalable cloud-native systems and integrate AI directly into enterprise workflows. 15+ years in software engineering — from traditional web apps to AI-augmented platforms where performance, privacy and intelligence converge.
Recent focus: Me2eM identity protocol, local LLM infrastructure and E2EE communications. Proven impact: 20× API speedup, −33% production bugs, 33% smaller production bundles.
Here you can download my CV in PDF and send me an instant message.
Thank you for your attention.
siteup24@gmail.com
+375-25-549-76-76
Belarus (remote worldwide)
Full-time · Contract · Remote · English B2
Skills
- AI / LLM: Artificial Intelligence, Local LLMs, Ollama, llama.cpp, RAG, Context Engineering
- Cryptography / E2EE / Web3: X3DH, BIP39, Ed25519, AES-GCM, HKDF, Argon2id, Web Crypto API, Key Wrapping, Solana, x402
- Backend: Node.js, TypeScript, NestJS, Fastify, Express, Hapi, Moleculer
- Frontend: React.js, Next.js, Angular, Redux, Tailwind CSS
- Databases: PostgreSQL, MongoDB, MySQL, Redis, SQL, Mongoose ODM, Sequelize
- Cloud / DevOps: AWS (Lambda, SAM, API Gateway, CloudFormation, CloudWatch, S3), Docker, Docker Compose, GitHub Actions, GitLab, Sentry
- Real-time / Web: WebRTC, WebCodecs, WebSocket, JSON-RPC, OCPP
- Testing / Tools: Jest, Vitest, Postman, Swagger, WordPress
- Languages: English B2 · LinkedIn Skill Assessments passed: Node.js, React.js
Work Experience
Full Stack Engineer at Twelvedevs
AUG 2024 - MAR 2025 · Remote
Working on transportation management systems and carrier integration platforms. Developing scalable solutions with NestJS, React, PostgreSQL and modern authentication systems (Ory Hydra/Kratos, OAuth 2.0 + JWT).
Software Development Engineer at EPAM Systems
JAN 2022 - JUL 2024 · Minsk / Remote
EPAM Systems Inc is an American technology company providing software engineering services for software development and digital platforms. Engaged in several projects — see Projects below. Completed internal courses to improve qualification.
Software Engineer at BisonSoft
FEB 2020 - JAN 2022 · Remote
BisonSoft is an outsourcing company specializing in the healthcare sector, focused on the US market. Participated in several projects — including a WordPress to Next.js migration (see Projects below).
Web Developer at RM Consultants
MAR 2015 - DEC 2019 · Moscow, On-site
RM Consultants is a French tourism marketing and event agency, specialized in promotion of high-end European tourist products: luxury hotels, restaurants, destinations, lifestyle brands in Russia, Ukraine and C.I.S. Responsibilities included web sites development and design documentation.
Frontend Web Developer at Belita-Vitex-Mogilev, LLC
JUL 2014 - MAR 2015 · Mahilyow, Belarus
BELITA is a Belarus-Italy joint company, one of the leading cosmetics manufacturers in the CIS. Development of web applications, team coordination and planning, system administration.
Web Software Developer at StrimTech
JAN 2013 - JUL 2014 · Mahilyow, Belarus
StrimTech develops and produces electronic components, mechatronic modules and hydromechanical units for large Belarusian factories (BelAZ, MAZ, MZKT). Web development, CGI programming.
Software Engineer at SPK Moscow
JAN 2006 - JAN 2007 · Moscow, On-site
Software engineering: Perl, Joomla!, web development.
System Administration Specialist at BKK Kolomenskoe
JAN 2003 - JAN 2006 · Moscow, On-site
System administration.
Projects
Me2eM — Unified Identity & Communication Layer ● MAY 2026 - PRESENT
Founder & Lead Developer · me2em.com
A unified identity and communication layer where humans, AI agents, Telegram bots and IoT devices are equal participants ("Entities") with cryptographic identities, enabling E2EE interactions between any of them.
ACHIEVEMENTS:
- - Designed and shipped 4 npm packages (@me2em/core, /crypto, /react, /solana): identity primitives, E2EE channels, React bindings, Solana payments
- - Implemented the cryptographic stack on peer-reviewed standards only: BIP39, Ed25519 (RFC 8032), X25519 (RFC 7748), HKDF, Argon2id, X3DH, AES-GCM
- - Architected a 4-domain ecosystem: me2em.com (protocol core), we2em.com (IdP/SSO), w2em.com (messenger + wallet), t2em.com (agent-friendly E2EE vault with zero-knowledge server and Solana/x402 payments)
⚒ TypeScript, Node.js, React, BIP39, Ed25519, X3DH, AES-GCM, Solana, x402, E2EE, npm
EV Charging Management System — Platform Launch ● NOV 2025 - MAY 2026
Platform Engineer — first technical hire · NDA
EV charging platform built on open standards (Linux Foundation Energy, OCPP 1.6J / 2.0.1) for the EAEU market, connecting charging stations, payment gateways and a cartographic service into one operator-facing system.
ACHIEVEMENTS:
- - Launched the platform on the customer's hybrid infrastructure (Docker Compose base + managed VPS production)
- - Deployed and configured CitrineOS Core 1.6.0 (Node.js / Fastify / PostgreSQL / RabbitMQ / Hasura GraphQL) as the platform core
- - Replaced Stripe with local payment gateways (bePaid, CloudPayments) — sanction-free stack
- - Configured OCPP 1.6J WebSocket server for live charging stations; set up Hasura GraphQL Engine for the operator UI
- - Mentored a mobile developer: task planning and API architecture code review
⚒ TypeScript, Node.js, Fastify, PostgreSQL, RabbitMQ, Hasura GraphQL, Docker, WebSocket, OCPP 1.6J / 2.0.1, bePaid, CloudPayments
Local AI Setup & Chat-App — Local-First LLM Stack ● SEP 2025 - PRESENT
Author / sole developer · Personal R&D · github.com/SeLub/chat-app
A fully local AI stack (model + web shell) running on a single RTX 4060 Ti 16GB machine — no external APIs. The model, files, speech transcription and usage statistics all stay on-device.
ACHIEVEMENTS:
- - Built a 3-mode local model stack with MTP acceleration via llama.cpp: Turbo (~70 TPS peak, 98k context), Workhorse, Heavy (deep reasoning)
- - Shipped Chat-App (MIT, public on GitHub): React 18 + Express 5 + SQLite + WebSocket web shell for local LLMs
- - Implemented adaptive context management: token density measurement, pre-flight overflow checks, LIFO trimming, manual pair selection
- - Added PROJECT mode: bind a session to a folder, read reference files from disk on every request (mtime cache, traversal protection)
- - Integrated local STT: whisper.cpp (two parallel instances) + Silero VAD v5 via onnxruntime-web (WASM, SharedArrayBuffer)
⚒ React 18, TypeScript, Vite, Tailwind CSS 4, Zustand, Express 5, SQLite, WebSocket, Ollama, llama.cpp, whisper.cpp, Silero VAD, Docker Compose, Vitest
E2EE Video Conference Recording — Client & Server Modules ● APR 2025 - NOV 2025
Software Developer — client and server modules · NDA
End-to-end encrypted video conference recording for group calls up to 4 participants. Recorded files can only be opened with a valid wrapped key, with access revocation and restoration controlled by the administrator.
ACHIEVEMENTS:
- - Enabled group call recording without UI freezes by offloading composition and encryption to a Dedicated Web Worker
- - Guaranteed files cannot be opened without authorization and a valid wrapped key — client-side E2EE with AES-GCM and RSA-OAEP/ECDH key wrapping
- - Implemented administrator access revocation (immediate loss of playback) and automatic access restoration on subscription renewal
- - Verified the server never stores media in plaintext (S3 scan) — zero-knowledge server
⚒ React, TypeScript, WebRTC, WebCodecs, Web Crypto API, E2EE, NestJS, PostgreSQL, Redis, Mediasoup, Coturn, S3, Docker Compose, GitHub Actions
Carrier Integration & Distribution Platform (Atlasbus) ● JAN 2025 - MAR 2025
Full Stack Engineer (NestJS + React) — API integrations and authentication · Twelvedevs · atlasbus.by
The largest IT service and technology integrator for intercity and international bus transportation in Belarus, Russia and CIS. The platform connects hundreds of independent carriers and provides centralized booking, payment processing and commission-based ticket sales.
ACHIEVEMENTS:
- - Built API integrations between the platform and multiple carrier partners
- - Implemented role-based authentication using Ory Hydra and Ory Kratos (OAuth 2.0 + JWT)
- - Developed scalable backend services with NestJS and TypeScript
⚒ NestJS, TypeScript, React, PostgreSQL, Redis, Ory Hydra, Ory Kratos, JWT
Shiptify — Digital Supply Chain & TMS Platform ● AUG 2024 - MAR 2025
Full Stack Engineer (Angular + Node.js) — customer-facing features and auth · Twelvedevs · shiptify.com
A digital supply chain and collaborative Transportation Management System (TMS), dock management and invoice verification platform. Founded in 2016 in Nantes, France — a centralized "control tower" to digitize and manage freight operations across road, air, sea and rail.
ACHIEVEMENTS:
- - Implemented the public customer page with full authentication integration
- - Integrated OAuth 2.0 authentication (Ory Hydra/Kratos) with the existing customer portal
⚒ Node.js, Angular, TypeScript, PostgreSQL, Docker
Sentry: Centralized Monitoring and Error Tracking System ● JAN 2023 - JUL 2023
Software Development Engineer — monitoring and observability · EPAM Systems
Automation tool for HR professionals that transfers resumes from LinkedIn to a corporate CRM. Customers reported errors that were not tracked.
ACHIEVEMENTS:
- - Deployed self-hosted Sentry standalone on a dedicated server; centralized logging, monitoring and notifications for BE (Node.js / Winston) and FE (Vue) across dev, QA and production
- - Result: −33% production bugs, faster error fixes, real-time product status, simple error tracking
- - Related module (Grab LI, Chrome extension): reduced prod bundle size by 33% via dependency cleanup and Webpack upgrade
⚒ Node.js, Vue, Winston, Sentry, Docker, MongoDB, Mongoose ODM, Moleculer, GitLab
Joe and the Juice ● NOV 2022 - JAN 2023
Backend Software Developer — Hapi server on AWS; FE is React Native iOS app · EPAM Systems · joejuice.com
Danish urban juice bar, coffee shop and lifestyle brand (500+ locations across Europe, North America, Middle East and Asia). The loyalty app lets customers order ahead, earn rewards and track loyalty perks.
ACHIEVEMENTS:
- - Optimized Sequelize queries with AWS X-Ray tracing → 20× faster API responses
- - Implemented RESTful services with Swagger / OpenAPI documentation
- - Troubleshot high latency in API Gateway requests; updated & refactored the codebase (removed deprecated packages, reviewed deep dependencies)
⚒ Node.js, Hapi, AWS (Lambda, API Gateway), PostgreSQL, Sequelize.js, MongoDB, Docker, Jest, Postman, Swagger
Bayer AgroAlliance — Loyalty Platform for Ukrainian Farmers ● JAN 2022 - NOV 2022
Backend Software Developer — microservices on AWS · EPAM Systems · agroalliance.bayer.ua
Loyalty and rewards platform for Ukrainian farmers. Farmers accumulate points for purchasing official Bayer crop protection products and seeds, scan invoices via the Bayer Kometa app, and redeem points for agronomist tools, gadgets, fuel certificates and gift cards.
ACHIEVEMENTS:
- - Integrated a third-party loyalty system (Antavo) with the Bayer platform
- - Developed, tested and deployed AWS Lambdas with AWS SAM; built and deployed RESTful APIs with AWS API Gateway
- - Implemented business-level logic in the database using Node.js and pure SQL
⚒ Node.js, AWS (Lambda, API Gateway, SAM, CloudFormation, CloudWatch), PostgreSQL, SQL, Antavo
University Website — WordPress to Next.js Migration ● FEB 2020 - JAN 2022
Software Engineer — migration and re-platforming · BisonSoft
Content-rich, deeply categorised WordPress website of a major university.
ACHIEVEMENTS:
- - Dockerized both Next.js and WordPress, so the legacy system kept running while the new one was being built
- - Fetched and parsed data from the existing MySQL database (WordPress) into Next.js — no data migration downtime
- - Result: authors kept the familiar WordPress UI; seamless transition to Next.js without stopping the current system
⚒ Next.js, Node.js, Docker, WordPress, MySQL
Education
Engineer's degree, Postgraduate studies
Belarusian State Economic University
1997 - 2000
Economic Cybernetics
Belarusian State Economic University
1992 - 1997
Associated skills: Programming · Computer Science · Algorithms · Mathematical Modeling
Contact
You can send me a quick email via the form below. I`ll respond you ASAP. Thank you for your attention.
Location
Belarus (remote worldwide)
siteup24@gmail.com
Phone
+375-25-549-76-76