Denys Kirevby Denys Kirev
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DENYS KIREV

Full-Stack Developer · React · TypeScript · Node.js

LinkedIn · GitHub · CV · kirevden@gmail.com · +385 99 7572 031
Rijeka, Croatia (GMT+1) · Ukrainian national · Work permit holder (Croatia) · Languages: English (B2), Croatian (A2), Ukrainian (Native)

SUMMARY

8+ years as a full-stack developer building web admin, SaaS, dashboards, and 3D/WebGL products across AI SaaS, fintech, logistics, and cybersecurity. Since Jan 2024 (~2 yrs), founder of OrchestrAI — production AI SaaS (Instagram DMs → structured orders for e-commerce). Strong in React, TypeScript, Node.js, PostgreSQL, Python, and LLM-augmented delivery — greenfield and legacy, with a track record of improving performance on data-heavy products.

Domains: AI-based SaaS, Cybersecurity, E-commerce, Enterprise SaaS, Logistics & Delivery, Data Visualization, Real-time systems, Admin/CMS, Building & 3D (Web)

EXPERIENCE

OrchestrAI / Adminly — Product company · Founder & Lead Software Engineer · Jan 2024 – Present · Remote, Croatia

AI SaaS: Instagram DMs → structured orders for e-commerce and creator-commerce teams. Full-stack ownership. Build-in-public on Code Loom

  • Multi-tenant monorepo (Turborepo, Next.js), Clerk, LLM extraction pipelines, Instagram OAuth/webhooks
  • Admin workflows (React, Redux Toolkit, Ant Design); Prisma, PostgreSQL, Stripe, Docker, CI/CD, Sentry, PostHog

Technologies: React, Next.js, TypeScript, Node.js, Turborepo, Prisma, PostgreSQL, Clerk, Stripe, Redux Toolkit, Tailwind, Zod, Docker, WebSockets, LLM APIs

Team Challenge — Volunteer · Volunteer Mentor · Frontend · Project Manager · Mar 2025 – Present · Remote · Volunteer

Ukrainian IT community platform — cross-functional pet projects for junior/trainee developers.

  • Mentor (general) — architecture, code review, delivery practices, career path
  • Online store (e-commerce) — team mentor, hands-on frontend (React/TypeScript), project manager (scope, priorities, coordination)

Technologies: React, TypeScript, Next.js, project management, code review, team mentoring

DataArt — Outsourcing · Senior Software Developer · Nov 2020 – Feb 2025 (4 yr 4 mo) · On-site, Ukraine → Remote, Croatia

4 clients — quick-commerce, Americas delivery (greenfield), US fintech analytics. React, TypeScript, Node.js BFF, Python (FastAPI).

Delivery mobile platform — legacy in-house CMS (catalog, profiles, availability, warehouse management)

  • React/Redux evolution, API design, component library improvements

Comexpress (Delivery platform) — greenfield

  • Node.js BFF, microservices, shipment admin UI, WebSockets, Azure AD, Storybook

Bluefoot — US fintech analytics

  • Greenfield React; FastAPI + BFF; AI-assisted data parsing; D3.js
  • Improved API latency through profiling and optimization; contributed to frontend technical interviews

Technologies: React, Next.js, TypeScript, Node.js, Python, FastAPI, Redux Toolkit, RTK Query, D3.js, Storybook, Ant Design, AWS, Azure AD, WebSockets, Jest

FS Group — Product company · Software Developer · May 2018 – Nov 2020 (2 yr 7 mo) · On-site, Ukraine · Cybersecurity

React admin UIs → full-stack with Python (Flask), ~1 year; threat intel and monitoring products.

  • Dashboards, operational workflows, Flask APIs; component library and architecture input with client teams

Technologies: React, TypeScript, Python, Flask, Redux, REST, SCSS

Uni Agency (Unilimes) — Outsourcing · Software Developer · Junior → Middle · May 2017 – May 2018 (1 yr 1 mo) · On-site, Ukraine · 3D / digital

Worked on interactive 3D and VR desktop web and mobile apps using Three.js, WebGL, and React.

Technologies: JavaScript, React, Three.js, WebGL, Canvas, HTML, CSS

SKILLS

Backend: Node.js, Express, Python (FastAPI, Flask), REST, GraphQL, auth/API integrations
Frontend: React, Next.js, TypeScript, Redux Toolkit, RTK Query, Vue, Three.js, D3.js, Socket.IO
AI: LLM integrations, AI-assisted workflows, structured-output pipelines
AI dev: Cursor, Claude, Claude Code, GitHub Copilot, ChatGPT, Codex — codegen, refactors, reviews, docs, tests
Infra: PostgreSQL, MongoDB, Prisma, Docker, AWS, CI/CD, Linux, Nginx
Tools: Jest, React Testing Library, Git, Jira, Postman

Currently learning: LLM hardening, SaaS infra/DevOps, delivery automation

KEY ACHIEVEMENTS

PUBLICATIONS & CONTENT

LinkedIn (top by engagement):

Blog: Code Loom · CV (PDF)

CERTIFICATIONS & PROFESSIONAL DEVELOPMENT

AI: Prompt Engineering: Techniques and Construing — Coursera · Apr 2025

Full-stack & frontend: MERN Stack Front to Back (React, Redux, Node.js) — Udemy · Oct 2019 · React + Redux — Professional Development — Udemy · May 2019

Backend & infra: REST APIs with Flask and Python — Udemy · Jan 2019 · Docker — Udemy (DataArt) · Kubernetes — Udemy (DataArt)

EDUCATION

Professional Front-End Developer Program (certification pending) — Algebra Bernays University, Zagreb, Croatia · Nov 2025 – Jun 2026

M.Sc., Fire Security — Academy of Fire Safety named after Chernobyl Heroes, Cherkasy, Ukraine · Aug 2007 – Jun 2012

Web Development (completed; certificate not issued) — Computer Academy STEP, Odesa, Ukraine · Sep 2013 – Sep 2014