Юрій Veteran

Yurii Tesliuk
FULL STACK JAVASCRIPT DEVELOPER

WORK EXPERIENCE
CONTACTS Full Stack Developer/ Founder
Sytno — AI HealthTech PWA 05.2026 - now
[open contact info](look above in the "contact info" section)
Job responsibilities: Architected and built a Progressive Web App using
[open contact info](look above in the "contact info" section)
Next.js, TypeScript, Tailwind CSS, and MongoDB with offline capabilities for
GitHub smart grocery management. Implemented a hybrid AI pipeline integrating
OpenAI API (gpt-4o) where recipes are generated by LLMs while calorie and
Linkedin macro calculations are handled deterministically via a canonical
ingredient database to eliminate hallucinations. Optimized serverless
@Yurii_Tesliuk performance through incremental menu generation to bypass Vercel's 60s
execution limit, integrated LiqPay API for B2C subscriptions, established
end-to-end PostHog and GA4 analytics, and redesigned the onboarding
TECH SKILLS funnel to achieve first paid customer conversions from organic search
traffic. SEO optimization implemented.
JavaScript (3 years)
Tools and technologies: Next.js (TypeScript, Tailwind), MongoDB, OpenAI API,
TypeScript (3)
Telegram Bot API, PostHog та GA4 analitic, LiqPay.
React (3)
React Redux (3)
Next.js (3) Full stack developer
REST API (3)
Cappi (project involvement) 10.2025 - 01.2026
Node.js, Express.js (2.5)
Nest.js (2) Job responsibilities: 1. Designed and developed an AI-powered internal
MongoDB (2.5) consultant for company employees accessible via Telegram bot interface,
PostgreSQL (2) enabling quick access to operational procedures and job instructions.
OpenAI API (2) 2. Implemented a hybrid RAG pipeline (BM25 + vector search) over a
Telegram Bot API (2.5) Qdrant vector database, retrieving the most relevant internal
documentation and generating precise responses with OpenAI LLMs.
LiqPay API (3)
3. Built an admin dashboard (Next.js) for monitoring user interactions
Tailwind CSS (3)
(questions/answers analytics) and managing instruction documents
Git (3)
(CRUD operations, versioning, and semantic enrichment).
4. Developed a content parsing pipeline that extracts text and analyzes
images from uploaded documents, merges them, and performs contextual
LANGUAGES text enrichment for improved LLM understanding.
English - B2 Tools and technologies: NestJS, Next.js (TypeScript, Tailwind), Qdrant,
Ukrainian - Native MongoDB, OpenAI API, Telegram Bot API, BM25 + embeddings hybrid search,
and Vision model for document parsing.

EDUCATION Full stack developer
TeGem 07.2025 - 06.2026
2024 Software Engineering
Zero To Mastery Jоb responsibilities: Developed a multi-page website with admin
Academy authentication (login/password). Built an admin dashboard with analytics
2022– FULL STACK JS and functionality for creating and managing posts, including SEO
2023 DEVELOPER optimization. Integrated MongoDB and Supabase for storing posts and
IT School GoIT media files. Redesigned others landing pages according to Figma
mockups, ensuring responsive and modern UI.
2001– MASTER’S DEGREE Tools and technologies: Next.js, TypeScript, React (Hooks), Tailwind CSS,
2006 Ternopil National Git, MongoDB, Supabase
Economic University
#outsource #outstaff #automations #fintech #digitalization #startup #mvp #poc
#research #javascript #nodejs #react #next #mobile #desktop #AI-intergation

WORK EXPERIENCE
Full stack developer
WWG.IT (full time) 09.2024 - 03.2025

Jоb responsibilities: Support and improvement of questionnaires, their
integration with advertising landing pages, OpenAI API (via backend
Nest.js), also whith Pipedrive CRM. Writing prompts for LLM (OpenAI API).
Creation landing pages, integration of advertising and analytical services
in them. Work on internal CRM. Improving software performance and
efficiency by optimizing algorithms and code.

Tools and technologies: Next.js, TypeScript, React (Hooks), Tailwind CSS,
Nest.js, Git, Strapi

Front-end developer 06.2024 - 08.2025
TradeKeeper startup (part time)
Project description: Developed a trading analysis system for traders - the
system is designed to provide a comprehensive cryptocurrency trade
journal and financial management platform for users. It enables users to
track their trading activities, manage multiple accounts, and analyze their
performance with detailed metrics and historical data snapshots.
Increased product visibility by building a high-converting landing page
showcasing the application’s core benefits. Improved user insights by
designing and implementing event tracking and data collection logic, with
storage in MongoDB. Enhanced marketing decision-making by developing
an admin dashboard with analytical charts for event analysis and
forecasting. Supported successful product launch by contributing to the
creation of a go-to-market strategy.

Tools and technologies: Next.js, TypeScript, React (Hooks), Tailwind CSS,
Git, MongoDB, Redux, React Query

Full stack developer
Freelance 02.2024 - 06.2024
Project description: Multi-page website with a responsive layout for the
Credit Union “Credit-FOS”. Was integrated interactive loan and deposit
calculators, along with user-friendly forms for loan applications and
inquiries, seamlessly connected to the company's Telegram bot for
efficient communication. Additionally, I crafted informative pages detailing
regulatory documents, legal information, and services
Link to project: https://fos.te.ua/
Tools and technologies: Next.js, TypeScript, React (Hooks), Tailwind CSS,
Telegram Bot API, Git

Full stack developer
Freelance 08.2023-12.2023
Project description: Multi-page website with a responsive layout for the
"Gym Adrenalin" company. Site has interactive fitness calculators, services
where it is possible to pay by bank card and posts that come from the
backend. The design is implemented for light and dark themes.
SEO and Lighthouse optimization was done - achieved 3-5th place in local
Google search and 5.5k views per month
Link to project: https://gym-adrenalin.com.ua
Tools and technologies: Next.js, TypeScript, MongoDB, React (Hooks), Git,
Tailwind CSS, LiqPay API, Next-Auth