Available for new roles
Authorized to work in Canada with no sponsorship required. Open work permit valid through February 19, 2029 — 2 years 5 months remaining.
About
I build scalable products on the Node.js ecosystem — 10+ years in TypeScript, Node.js, NestJS, GraphQL, and event-driven microservices across PostgreSQL, Redis, Kafka, and AWS, with frontend delivery in React, Next.js, and Vue.js. Recently I delivered a D2L education platform for a large Canadian charity and shipped generative-AI products powered by fine-tuned LLMs on serverless AWS. I've cut API latency 40%+, improved reliability at scale, and spent 6+ years leading teams for North American clients.
Open Source
55 merged upstream PRs, including a code fix in nestjs/graphql, feature work on Zilliqa's kaya, and a fix in eslint-plugin-compat.
github.com/exarus →Education
- Master's Degree in Software Engineering — Igor Sikorsky Kyiv Polytechnic Institute, Ukraine, 2018
- Bachelor's Degree in Software Engineering — Igor Sikorsky Kyiv Polytechnic Institute, Ukraine, 2017
Certifications
- Machine Learning (Stanford)
- MongoDB for Java Developers
Spoken Languages
English (Fluent) · Ukrainian (Native) · Russian (Native) · Romanian (Elementary) · German (Elementary)
Projects
Products I've shipped — select any screenshot for the full-size version.
PIXIO — social platform & voxel studio
A social platform for 3D pixel artists built around PIXIO magnetic blocks — artist profiles with followers and likes, an in-browser voxel builder, and an e-commerce storefront.
eWizard — multi-channel content platform for pharma
An enterprise platform where 150+ pharma and life-science companies create, edit, and publish email, web, and in-app content from a single editor. I built Vue.js editor features, rebuilt core Express.js and NestJS services (40%+ faster APIs), and led the feature team.
DMEX — decentralized derivatives exchange
A first-of-its-kind DEX for derivatives trading with up to 100x margin and non-custodial funds — smart-contract order settlement, a pro trading terminal with live order book and charts, and MetaMask wallet integration. Served 1,500+ users during initial rollout.
EtherMium — ERC-20 trading terminal
A decentralized trading terminal where any ERC-20 token can be traded without listing — TradingView charting, live order book and trade feed, and on-chain balances held by smart contract.
Experience
EPAM Systems
Senior Full-Stack Software Engineer
EdTech: education platform for a large Canadian charity on D2L (Desire2Learn)
- Led backend modernization of a D2L (Desire2Learn) education platform used by a large Canadian charity to deliver training to thousands of learners nationwide — cut page load times by 30%+ and improved reliability at scale.
- Migrated legacy data to PostgreSQL, redesigned schemas, and introduced structured migrations, improving query performance by 35% with zero data loss across repeated migration runs.
- Built accessible, reusable UI with Lit web components and TypeScript/Express.js REST APIs powering learner-facing course and content workflows, meeting WCAG accessibility standards.
- Introduced Jest unit and Supertest API integration tests gated in CI, cutting release regressions during the modernization.
- Owned features end-to-end with a distributed Canadian team — design, delivery, code review, and production support in an Agile/Scrum process, shipping 75 features across 17 sprints with zero critical production incidents, accelerated by AI-assisted development (Claude, Cursor, GitHub Copilot).
Viseven
Senior Full-Stack Software Engineer · Team Lead
eWizard: multi-channel content platform for global pharma
- Built core features of the eWizard editor in Vue.js — the flagship authoring component of an enterprise multi-channel content platform delivering email, web, and in-app content for 150+ pharma and life-science companies.
- Improved content-customization workflows, reducing content creation time by 30% while preserving consistent multi-channel rendering.
- Rebuilt core Express.js and NestJS services and owned their Terraform-declared infrastructure across a 100+ microservice platform, cutting API response times by 40%+ and increasing throughput at peak.
- Led the feature team — sprint planning, code reviews, and mentoring — coordinating delivery with product stakeholders across time zones.
R&D Center Winstars.AI
Senior Full-Stack Software Engineer (Contract)
Contract: generative-AI chatbot platform
- Designed and shipped an AI chatbot powered by a fine-tuned LLM, delivering personalized, context-aware conversations end-to-end.
- Built a generative-AI avatar pipeline creating characters from prompts via Stable Diffusion, with ElevenLabs-driven voice and text-to-speech for natural spoken interaction.
- Architected a fully serverless Python backend on AWS (Lambda, Step Functions) with FastAPI services orchestrating LLM inference, image-generation, and voice-synthesis workflows with pay-per-use scaling.
- Delivered a responsive React / Next.js frontend with streaming AI responses and real-time voice playback.
Trendformer
Senior Full-Stack Software Engineer · Tech Lead
Social platform for 3D artists
- Transformed a static landing page and CMS into a scalable social platform across web, iOS, Android, and an admin dashboard.
- Designed the backend architecture for an event-driven platform of 5 NestJS microservices in an Nx monorepo with shared TypeScript libraries — collaborative editing, multi-device sync, conflict resolution, and AI-assisted content selection.
- Introduced Elasticsearch, gRPC, Kafka, and Redis — self-provisioning the Kafka + Debezium change-data-capture pipeline and its Terraform-declared infrastructure with one other engineer (no dedicated DevOps) — cut search response times by 40% and improved event-driven communication, processing, and caching.
- Optimized BullMQ background jobs and Apollo Federation GraphQL APIs, reducing data-fetch time by 40%.
- Integrated a Shopify-based e-commerce layer into the product ecosystem.
- Led a 4-person engineering team as sole senior — sprint planning, code reviews, and mentoring — cutting average feature cycle time from 14 to 9 days.
CodeRiver
Lead Frontend Software Engineer
Decentralized crypto exchange & Web3 products
- Launched a decentralized crypto exchange built on Solidity smart contracts, serving 1,500+ users during initial rollout; promoted to Lead Frontend Engineer.
- Led a team of 4 developers to operational readiness in 4 months through agile execution, code reviews, and CI/CD practices.
- Built a Vue.js / Web3.js crypto game that scaled to 50K+ players, with real-time on-chain state sync and optimistic transaction UI.
Earlier roles — Ineffable Innovations · Netcracker Technology
Ineffable Innovations
Full-Stack Software Engineer · Team Lead
Early-stage AI startup (volunteer); wound down after funding fell through
- Led a 4-person team end-to-end (planning, reviews, delivery) building an AI microcomputer application in Python / React / TensorFlow.js.
- Reduced cloud costs by $20K/year by moving ML inference on-device with TensorFlow.js.
- Grew the beta program to 400 testers, driving product iteration directly from structured user feedback.
Netcracker Technology
Software Engineer
OSS/BSS & telecom solutions
- Developed presales proof-of-concepts for OSS/BSS and MANO/SDN telecom solutions, from concept through customer presentation.
- Delivered 3 high-demand features ahead of schedule by aligning development with shifting presales priorities.
- Represented engineering in direct discussions with major telecom stakeholders across 4 international business trips.