Костянтин

Kostiantyn Ravnyshyn
Phone: [open contact info](look above in the "contact info" section)
Telegram: @Gygi4
GitHub: github.com/Gygi4

Location: Kyiv

Desired Position

Backend / Fullstack Developer
Specialization:
- Programmer, Software Developer
Employment type: Full-time
Work format: Remote only

Work Experience
2026 SoftList
Team Lead / Senior Backend Engineer
Worked on two separate projects, serving as Team Lead on one and Senior Backend Engineer on the
other.

Team Lead
- Reviewed code submitted by the development team.
- Held daily team meetings, assigned work and tracked development progress.
- Broke down work in Jira, created subtasks and assigned them to individual developers.

Senior Backend Engineer
- Implemented file-processing logic, including algorithms for splitting files into chunks.
- Optimized file uploads and worked on the related client-side functionality.

Technologies: TypeScript, NestJS, PostgreSQL, Sequelize, Redis, Apache Kafka, MinIO.

Team tools: Jira, Confluence, Bitbucket.

Projects Telegram Bots and Backend Integrations
Telegram
TypeScript Backend / Bot Developer
- Built Telegram bots in TypeScript using Telegraf, grammY and the Telegram Bot API.
- Implemented user flows with commands, inline buttons, middleware, context, state, roles, access
control and input validation.
- Developed gamified business logic with progression, events, state and application rules.
- Deployed bots on VPS and in Docker, configuring webhooks or polling, environment variables,
logging and external integrations.
Stack: TypeScript, Node.js, Telegram Bot API, grammY, Telegraf, Docker, Linux / VPS.

Resume updated on September 26, 2026 1

Skills
Languages Ukrainian - C1
English - B1

Skills TypeScript JavaScript Node.js Bun NestJS Express REST API React Vite
PostgreSQL Sequelize Prisma Redis MongoDB ScyllaDB MinIO Apache Kafka
RabbitMQ BullMQ Docker Linux / VPS Git GitHub Actions CI/CD Jira Confluence
Bitbucket Code review SOLID Clean Architecture Telegram Bot API grammY Telegraf
Discord.js Python Django FastAPI Pydantic SQLAlchemy asyncio pytest Java Kotlin

Additional Information
About Me I am a programmer and Backend / Fullstack Developer. I work with TypeScript, JavaScript, Node.js and
NestJS, building server-side business logic, REST APIs and integrations with external services. For
frontend development, I use React and Vite.

At SoftList, I worked on two different projects. As Team Lead, I reviewed code, ran daily team meetings,
distributed work and tracked development progress. I broke down tasks into subtasks in Jira and
assigned them to developers.

As Senior Backend Engineer, I focused on file-processing algorithms, including splitting files into chunks
and optimizing uploads. I also worked on the associated client-side functionality.

I have built modular backend logic with clear separation between layers. In external integrations, I
handled changes in response formats, rate limits, retries and fallback scenarios. I have worked with
sharding and clustering, handled errors and supported releases.

I work with PostgreSQL, ORMs, Redis and job queues. I have deployed services on Linux / VPS and in
Docker, configured environment variables and logging, and worked with GitHub Actions and CI/CD. I
have basic experience with Kubernetes. My work has also included investigating bug reports, prioritizing
fixes and documenting technical decisions.

I use Codex and Claude Code for planning, review and development assistance. I define the tasks
myself, review generated code, address edge cases and integrate the results into the project.

Contact details:
Phone: [open contact info](look above in the "contact info" section)
Telegram: @Gygi4
GitHub: github.com/Gygi4

Resume updated on September 26, 2026 2