Yaroslav

Yaroslav Zhuravskyi
Full-Stack Engineer · TypeScript / NestJS / React · AI Integrations
Kraków, Poland · Open to remote (EU) · [відкрити контакти](див. вище в блоці «контактна інформація») · [відкрити контакти](див. вище в блоці «контактна інформація») · [відкрити контакти](див. вище в блоці «контактна інформація») · github.com/yqroslavz

SUMMARY
Full-Stack Engineer with 3 years of production experience building TrackBoost, an ad-tech SaaS used by media buyers and digital agencies (8-person engineering team).
Shipped two open-source full-stack AI applications end-to-end — Ad-Creative Generator and Resume Tailor — spanning NestJS, Next.js, PostgreSQL, GraphQL, and three LLM
providers. Seeking a full-stack role on a product team that ships fast and treats AI integration as a first-class part of the stack.

SKILLS
Languages TypeScript, JavaScript
Frontend React, Next.js 16, Redux, Tailwind CSS, Ant Design, HTML/CSS
Backend Node.js, NestJS, Express, REST APIs, GraphQL (Apollo), Prisma, Mongoose, BullMQ, Server-Sent Events
Databases PostgreSQL, MongoDB, MySQL, Redis
Testing Jest, React Testing Library, Playwright, Postman
InfrastructureDocker, GitHub Actions (CI/CD), AWS S3 SDK
AI / LLM Anthropic API, OpenAI API, Google Gemini API, n8n workflows, Claude Code / Cursor (LLM-augmented dev workflow)
Integrations Taboola, Outbrain, MGID, TikTok Ads, Adskeeper, RevContent, Line, Tonic

EXPERIENCE
Full-Stack Engineer · TrackBoost, Kraków (Hybrid) 07/2023 – 04/2026
Ad-tech SaaS with two products: a campaign tracking and automation platform for affiliate marketers, and a media-buyer analytics dashboard for a digital agency whose
clients include brands such as Pepsi and Starbucks.
Stack: TypeScript, NestJS, Express, React, Redux, MongoDB, MySQL, Redis, Prisma, Docker, GitHub Actions, OpenAI API, n8n
Migrated the TikTok Ads integration to a new authentication flow ahead of TikTok's deprecation deadline, with zero downtime on active campaigns through the cutover.
Diagnosed a production MongoDB connection-exhaustion incident across NestJS workers and n8n, isolating the source of connection saturation; partnered with DevOps to
restore stable access.
Built and maintained 8 ad-network REST API integrations in NestJS (Taboola, Outbrain, MGID, TikTok, Adskeeper, RevContent, Line, Tonic), covering campaign creation,
creative generation, and scheduled stats-sync pipelines processing peaks of hundreds of thousands of records per cycle.
Maintained and debugged AI-driven creative-generation features in NestJS via the OpenAI API (image and headline generation for ad teasers); resolved generation-pipeline
failures and operated an n8n + LLM content workflow in production.
Implemented React + Redux + Ant Design frontend features used by 150+ daily users in production, including large data tables with custom resizable columns, role-based
permissions, and bulk-action multiselect.
Built a programmatic ad-buying automation module with external-API integration for creative scraping and complex aggregations over multi-gigabyte MySQL datasets,
powering bulk-action workflows in production.

SIDE PROJECTS
Ad-Creative Generator 2026
ad-creative-generator-web.vercel.app · github.com/yqroslavz/ad-creative-generator
Open-source full-stack AI tool that generates native-ad creatives (headlines, descriptions, CTAs, and images) tailored to six ad networks: Taboola, Outbrain, MGID, TikTok Ads,
RevContent, Adskeeper. Free anonymous demo with optional BYOK premium tier.
Stack: Next.js 16, NestJS 11, PostgreSQL (Supabase), Prisma, GraphQL (Apollo), BullMQ + Redis, Clerk, Google Gemini / Anthropic / OpenAI APIs
Provider-agnostic AI layer: three text providers (Gemini / Anthropic / OpenAI) and a two-tier image pipeline (BYOK DALL-E with an in-process satori/resvg SVG fallback as
the $0 default); BYOK API keys encrypted with AES-256-GCM, worker-only decryption gated via AsyncLocalStorage, CI-enforced log redaction.
Per-network prompt templates for six native-ad networks; co-located BullMQ worker on Upstash Redis with Server-Sent Events for live job progress; 46 unit tests +
Playwright E2E + GitHub Actions CI required to merge to main.
Resume Tailor 2026
resume-tailor-yqroslavz.vercel.app · github.com/yqroslavz/resume-tailor
Open-source LLM-powered job-application assistant that analyzes a CV against a job description and generates tailored, multi-variant cover letters with built-in anti-overclaim
heuristics.
Stack: Next.js 16, Vercel AI SDK, TypeScript, Anthropic / OpenAI / Google Gemini APIs
Built end-to-end with Next.js 16 App Router and the Vercel AI SDK with streaming responses.
Integrated three LLM providers (Anthropic, OpenAI, Google Gemini); browser-side PDF parsing, no backend storage.

EDUCATION
Technical University of Košice — BSc in Computer Science (Intelligent Systems) 09/2022 – 06/2025
Completed the final two years while working full-time as a Full-Stack Engineer at TrackBoost (from 07/2023).
Bachelor's thesis: “Knowledge Distillation for Deep Neural Network Compression” — empirically evaluated multiple knowledge-distillation strategies for compressing CNNs
to meet mobile and edge resource constraints; multi-teacher logit aggregation improved student accuracy by 1.4–1.8% over a single-teacher baseline.

LANGUAGES
Ukrainian (native) · Russian (native) · English C1 (EF SET certified) · Slovak B1