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Software Engineer
- Age:
- 24 years
- City of residence:
- Kharkiv
- Ready to work:
- Remote
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Oleksii Chalenko
Software Engineer
[open contact info ](look above in the "contact info" section) [open contact info ](look above in the "contact info" section) Kharkiv, Ukraine
ochaoo Oleksii Chalenko AlfABeT_Qui
About Me
Backend-focused Full-stack Developer with 3+ years of commercial experience building secure,
integration-heavy web applications. Specialize in TypeScript, Node.js, NestJS, and React, with
hands-on experience in PostgreSQL, Redis, payment integrations, authentication, asynchronous
processing, and REST APIs. Focused on reliable systems, clean architecture, and maintainable
code.
Professional Experience
Confidential Client Projects (NDA) 09/2025 – Present
Backend / Full Stack Developer Remote
● Developed backend services and REST APIs using TypeScript, Node.js, NestJS, PostgreSQL,
Redis, Docker, and AWS services.
● Implemented reliable external API and webhook workflows with signature validation,
idempotency, retries, background processing, and audit-friendly state transitions.
● Integrated Stripe payment workflows and implemented TOTP-based two-factor
authentication compatible with Google Authenticator.
● Developed backend modules for a Telegram gaming platform using NestJS, Prisma,
PostgreSQL, and Redis, including matchmaking, background workers, player progression,
in-app purchases, and signed payment callbacks.
● Created and maintained database schemas, migrations, API documentation, automated
tests, and local development environments.
Advocate Association “Zahist” 09/2022 – 09/2025
Full Stack Developer Remote
● Designed and implemented RESTful APIs with Node.js/Express, ensuring secure
authentication and scalable architecture.
● Integrated OpenAI assistant to enhance user interaction and automate parts of
the workflow.
● Optimized database queries in MongoDB to improve performance and reduce
response time.
● Built dynamic user interfaces with React and managed state using Redux Toolkit.
Skills
Backend: Node.js, NestJS, Express, TypeScript, REST APIs, Webhooks
Databases: PostgreSQL, MySQL, MongoDB, Prisma, TypeORM, Sequelize, Mongoose
Async & Infrastructure: Redis, BullMQ, Docker, AWS, Git
Security & Payments: JWT, Refresh Tokens, TOTP / Google Authenticator, Stripe, Tap
Quality & Documentation: Jest, Swagger / OpenAPI, Postman, Sentry
Frontend: React, Redux Toolkit, Tailwind CSS, Ant Design
Education
Kharkiv National University of Radio Electronics
Bachelor degree, Software Engineering Master's degree, Computer Science
2019-2023 2023-2025
Software Engineer
[
ochaoo Oleksii Chalenko AlfABeT_Qui
About Me
Backend-focused Full-stack Developer with 3+ years of commercial experience building secure,
integration-heavy web applications. Specialize in TypeScript, Node.js, NestJS, and React, with
hands-on experience in PostgreSQL, Redis, payment integrations, authentication, asynchronous
processing, and REST APIs. Focused on reliable systems, clean architecture, and maintainable
code.
Professional Experience
Confidential Client Projects (NDA) 09/2025 – Present
Backend / Full Stack Developer Remote
● Developed backend services and REST APIs using TypeScript, Node.js, NestJS, PostgreSQL,
Redis, Docker, and AWS services.
● Implemented reliable external API and webhook workflows with signature validation,
idempotency, retries, background processing, and audit-friendly state transitions.
● Integrated Stripe payment workflows and implemented TOTP-based two-factor
authentication compatible with Google Authenticator.
● Developed backend modules for a Telegram gaming platform using NestJS, Prisma,
PostgreSQL, and Redis, including matchmaking, background workers, player progression,
in-app purchases, and signed payment callbacks.
● Created and maintained database schemas, migrations, API documentation, automated
tests, and local development environments.
Advocate Association “Zahist” 09/2022 – 09/2025
Full Stack Developer Remote
● Designed and implemented RESTful APIs with Node.js/Express, ensuring secure
authentication and scalable architecture.
● Integrated OpenAI assistant to enhance user interaction and automate parts of
the workflow.
● Optimized database queries in MongoDB to improve performance and reduce
response time.
● Built dynamic user interfaces with React and managed state using Redux Toolkit.
Skills
Backend: Node.js, NestJS, Express, TypeScript, REST APIs, Webhooks
Databases: PostgreSQL, MySQL, MongoDB, Prisma, TypeORM, Sequelize, Mongoose
Async & Infrastructure: Redis, BullMQ, Docker, AWS, Git
Security & Payments: JWT, Refresh Tokens, TOTP / Google Authenticator, Stripe, Tap
Quality & Documentation: Jest, Swagger / OpenAPI, Postman, Sentry
Frontend: React, Redux Toolkit, Tailwind CSS, Ant Design
Education
Kharkiv National University of Radio Electronics
Bachelor degree, Software Engineering Master's degree, Computer Science
2019-2023 2023-2025
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The candidate's resume is posted at https://www.work.ua/resumes/9859987/