galetka

Middle Python Developer

Over the course of my career, I’ve worked on a variety of projects that focus on building backend systems for decentralized applications (dApps), cryptocurrency-related platforms, and payment systems.

  • I’ve designed and implemented backend services for a conversational AI platform with Web3 capabilities, integrating natural language processing with blockchain technologies to enable seamless user interactions with decentralized applications.
  • In a different project, I developed scalable RESTful APIs to track cryptocurrency wallet balances, integrate payment gateways, and ensure secure access to real-time data. I worked on optimizing data processing pipelines and improving system performance.
  • More recently, I’ve been working on a backend system for an NFC-based cryptocurrency payment platform, focusing on transaction signing, key storage, and integration with popular crypto wallets. I’ve built secure infrastructure for handling wallet imports and developed real-time transaction processing systems.

I’m passionate about working with cutting-edge technologies, especially around cryptocurrencies and AI, and I’m looking for a position where I can continue to grow as a backend developer or architect.

Ideally, I want to work on projects that involve blockchain technology, smart contracts, or AI-based systems, especially those that offer innovative payment solutions or decentralized finance platforms. I’m open to both collaborative and independent roles, and I’m comfortable taking ownership of complex backend systems or working within a team to develop them.

The type of work environment I’m looking for is remote, and I would prefer compensation in cryptocurrency, as I believe in the potential of digital currencies.In the future, I’d like to deepen my expertise in blockchain architecture or AI-driven platforms, and I’m excited to work with teams that are as passionate about these areas as I am.


Experience: 4 years

Yearly salary: $20,000

Hourly rate: $30

Nationality: 🇺🇦 Ukraine

Residency: 🌏 Remote


Experience

Backend Developer for NFC-based Cryptocurrency Payment System
Hethar (startup)
2024 - 2025
Designed and implemented backend services for an NFC payment system using cryptocurrency, focusing on secure transaction signing, key storage, and smart contract integration. Developed transaction signing modules in Go and Python, ensuring fast and secure payments via NFC with crypto wallets (Phantom, Metamask, Trust Wallet, OKX). Built a secure backend infrastructure to handle wallet imports via private keys and seed phrases, facilitating seamless wallet selection and cryptocurrency payment processes. Developed an optimized transaction processing pipeline to ensure that NFC payments are as fast and reliable as traditional card payments, with real-time transaction success guarantees. Integrated with iOS 18.1 NFC module to enable direct communication between mobile devices and NFC-enabled payment terminals for cryptocurrency transactions. Implemented secure key management practices, utilizing cryptographic algorithms to protect user keys and ensure data integrity. Designed a monitoring and logging system to track transaction status, providing real-time error detection and troubleshooting for a high-quality user experience.
Python Backend Engineer
Just.AI
2024 - 2024
Designed and implemented backend services for a conversational AI platform with Web3 capabilities, supporting seamless chatbot interactions with decentralized applications (dApps). Developed Web3 modules using web3.py to enable wallet-based authentication and on-chain transaction execution directly through chatbot interfaces. Built a smart contract interaction framework, allowing users to query blockchain data (e.g., token balances) and execute smart contract functions via natural language commands. Implemented a backend pipeline for processing blockchain event subscriptions, enabling real-time notifications for wallet activities and on-chain updates. Collaborated with AI engineers to integrate natural language processing (NLP) models with backend APIs, ensuring smooth data exchange between the chatbot and blockchain layers. Optimized system throughput by 30% by streamlining API endpoints and implementing caching strategies with Redis. Designed a monitoring system to track API performance and detect blockchain network disruptions, reducing downtime for end users.
Backend Developer
Bitok
2022 - 2024
Designed and implemented scalable RESTful APIs to provide secure access to user portfolio data and real-time price updates. Built an automated system for tracking cryptocurrency wallet balances across multiple blockchains (Ethereum, Binance Smart Chain, etc.). Integrated payment gateways for cryptocurrency transactions, including support for stablecoins Developed efficient data processing pipelines (Python, Celery) to handle high volumes of blockchain data. Implemented OAuth2-based authentication and multi-factor security for platform users. Optimized backend performance, reducing database query latency by 40% through query optimization and caching mechanisms. Monitored, debugged, resolved production issues using tools Prometheus and Grafana.

Skills

backend
golang
python
solana
sql
web3-py
english
russian