Lead a small team of developers to plan, build, and deploy full-stack applications, owning features from technical design to production release. Implement smart contract interactions for blockchain-enabled features using Wagmi, Ethers.js, and Viem integrated into React/Next.js frontends. Integrate secure payment flows using PayPal, Adyen, Cryptomus, and MetaMask wallets, ensuring reliable transaction handling and error reporting. Improve overall codebase stability and maintainability by introducing and enforcing unit and integration testing with Jest/Supertest for critical APIs. Collaborate with product, design, and QA to define requirements, estimate effort, and deliver features on time in an Agile/Scrum environment.

Backend Developer (Solo) at Bellex

May 1, 2024 - May 1, 2024

Sole backend owner for two web products using NestJS and MySQL, responsible for architecture, development, and maintenance. Designed and implemented RESTful APIs with robust authentication, authorization, and validation, supporting secure multi-user workflows. Built reusable middleware and service layers to handle logging, rate limiting, and structured error handling, improving consistency across services. Tuned database queries and added proper indexing to improve API performance and reduce response times under load. Participated in deployment and production monitoring, working closely with stakeholders to troubleshoot and resolve issues after launch.