DENIS IRKHIN
Senior Full-Stack Developer — Montréal, QC, Canada
github.com/denIrkhin · linkedin.com/in/denis-irkhin/  (contact via LinkedIn)
English (Professional) · French (Professional) · Russian (Native)

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SUMMARY
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Senior full-stack developer, 7 years shipping production web and mobile
across SaaS, healthcare and communications (TypeScript, React, React
Native, Next.js, Node.js, AWS, Azure). Now building AI in production —
multi-stage LLM pipelines, RAG over a vector store, Azure OpenAI and
Anthropic Claude integration, prompt design and LLM observability — under
real latency and cost constraints, plus the backend observability to prove
it works. Earlier background in finance, ERP and BI brings a data-driven
view to engineering.

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SKILLS
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Languages   TypeScript, JavaScript, SQL, Python
Frontend    React, React Native, Next.js, Expo, Angular, RxJS,
            React Query, GraphQL, Tailwind, design systems
Backend     Node.js, NestJS, GraphQL, REST, PostgreSQL, MongoDB,
            BullMQ/Redis, WebSockets, WebRTC, Stripe, Kafka
AI / LLM    Azure OpenAI, OpenAI, Anthropic Claude, RAG, embeddings,
            vector DBs (Qdrant/pgvector), prompt engineering,
            LLM observability, AI coding tools
Cloud/Infra AWS (Amplify, Lambda, S3, CDK), Azure, Cloudflare, Render,
            Docker, Terraform, Pulumi, K8s, GitHub Actions, Playwright
Observ.     Datadog (APM/RUM/DBM), Grafana, Splunk, New Relic

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EXPERIENCE
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FlowLinker — Senior Full-Stack Developer            Feb 2026 – Present
  AI sales-conversation intelligence platform.
  - Built a multi-stage LLM pipeline turning call transcripts into
    structured requirements + solution-fit, with RAG over Qdrant.
  - Azure OpenAI with automatic OpenAI failover; owned prompt design
    and LLM observability in Datadog.
  - Built backend observability from scratch — Datadog APM/RUM/Postgres
    DBM with log-trace correlation across Next.js, NestJS and Python,
    all in Terraform.
  - Claude code-review bot on GitHub Actions; Playwright e2e against
    live meeting bots. Led the FE move to Next.js 16 / React 19.

Reppa (MonGym) — Senior Full-Stack Developer        Apr 2025 – Feb 2026
  - Delivered features for a React Native (Expo) app; contributed to
    Java/Quarkus backend services on GCP, focused on API optimization.
  - Built end-to-end test automation; mentored interns.

Swiftcare — Senior Full-Stack Developer             Oct 2024 – Apr 2025
  - Led a React Native architecture redesign; optimized an AWS Amplify
    (TypeScript) backend, cutting development cycle time.

Empego — Senior Software Developer                  Oct 2023 – Apr 2024
  - Scaled an Angular app to 30,000+ MAU; cut build times 75%
    (45s → 10s); reduced bundle size 50% via a Next.js CMS.
  - Led OpenAPI type generation Java → Angular; introduced Playwright.

AlleyCorp Nord — Software Developer III             Feb 2022 – Jul 2023
  Resolve: React + Next.js dashboards for 5,000+ MAU; Python
  microservices with Kafka; design system cut dev time 40%; auth
  errors down 70%. Reside Health: React Native app rated 4.8/5;
  payment success +25% with multi-account Stripe.

GoTo — Software Developer                           Apr 2019 – Feb 2022
  - Messaging + meeting features for millions of users; WebSocket
    real-time, offline caching, WebRTC audio/video, RxJS.

Earlier — Finance / ERP / BI                        2013 – 2018
  - 1C ERP architecture; Qlik/Power BI over 100M+ records; an RFID
    rollout that grew revenue 30%.

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EDUCATION
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Web Development — DecodeMTL (2019)
B.A. Finance (Honours) — Moscow Management Academy
MBA — California State University, East Bay