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Stanislav L.
@leshchyna
Full Stack Developer and Security Engineer
Grécia
Inglês, Ucraniano, Russo
Sobre mim
I build products, and then I try to break them. That combination is why clients keep me around after launch.
Years of production software: React and Vue on the front, Python and Node behind them, PostgreSQL and Supabase underneath. A degree in cybersecurity, and years spent reading other people's code the way an attacker reads it.
Most of my work is now one of two things. Building an MVP that will not embarrass you on launch day, or finding what is already wrong with one that exists.
Every engagement starts with a written scope and a fixed price.
Habilidades
Stanislav L.
offline •
Tempo médio de resposta: 1 hora
Conheça meus serviços
Aplicações Web Full Stack
I will do saas development, build your saas web app and mvp as full stack developer
API e Integrações
I will do api integration, reverse engineer any private api and build a python wrapper
Portfólio
Experiência profissional
Company
Período integral • 2 yrs 10 mos
Fullstack Engineer
Nov 2024 - Present • 1 yr 10 mos
AI-driven defense platform. Company and project under NDA. Backend in Python and FastAPI with Celery, PostgreSQL and Docker. I deploy and tune the AI models the product depends on, including speech to text, and I built the real-time WebSocket layer end to end, with reconnection and buffering for unstable field networks. Client side: the operator application in Vue 3 and TypeScript, with a WebGL map implementing the NATO APP-6D standard that stays smooth under continuous high-frequency updates. One of the main code reviewers. Introduced the team's engineering standards: linting, pre-push hooks, CI, unit tests.
Senior Reverse Engineer
Nov 2023 - Nov 2024 • 1 yr
Worked in the Python backend team at a crypto product company (mudr.corp) with five middle engineers. High-concurrency backend for large-scale online automation, built on FastAPI, PostgreSQL, SQLAlchemy and Alembic, with the legacy services migrated onto it. Observability set up from scratch in Prometheus and Grafana. Reverse engineering of undocumented and private APIs: request signing, session handling, rate limits, and the automation tooling built on top of them with Playwright and IMAP. On-chain operations through web3.py and Solana.
Fullstack Engineer
WEB3 • Período integral
Oct 2021 - Nov 2023 • 2 yrs 1 mo
Research and development company in Kharkiv (Distributed lab). Client and admin applications for products that handle money: a marketplace, financial and DeFi applications, e-commerce and social platforms. Vue 2 and Vue 3, React with Redux, TypeScript on the client. Node.js services behind REST and GraphQL APIs, Stripe for payments. Published reusable libraries that other teams built on, including the company web toolkit and a JavaScript SDK. One of the team's regular code reviewers. Took a master's degree in cybersecurity in parallel with this role.
