Іван

Ivan Kononenko
Full-stack Software Engineer (backend-focused)

3 years of commercial experience, specializing in full project ownership, end-to-end development, and
communication with foreign clients. Strong in independent development, taking initiative on project
responsibilities, effective communication within the team, and quick adaptation to projects with
unfamiliar tech stack.

Skills
Primary: Node.js, Typescript, Nest.js, Express.js, PostgreSQL, Prisma, Knex.js, Redis, Websockets.

Also experienced in: Koa.js, Fastify.js, FFmpeg, React, Redux, Tailwind, GraphQL, Jest, Swagger.

Infrastructure: Redis, CI/CD, Docker, AWS (EC2, S3, Cloudfront, Nginx + SSL), Linux, DNS.

Languages: Ukrainian (Native), English (B2), Russian (C2).

Work experience
Lumitech | Backend Engineer November 2025 - March 2026
Project: B2B Supply Chain Portal for Robotics Parts Manufacturing

Tech Stack: Fastify.js, PostgreSQL, Websockets, AWS (S3, DynamoDB, CloudWatch, SES), Swagger.

Responsibilities & Achievements:

Took full ownership of the backend part, architecting, developing, and maintaining it independently.

Designed and implemented a B2B communication system featuring secure real-time messaging,
notifications, and a transactional emailing system.

Built RBAC system, covering multi-role user account management and permission inheritance.

Identified potential bugs and inconsistencies between client requirements and the existing
implementation.

Incode Group | Full-Stack Engineer (backend-focused) October 2024 - November 2025
Project: International dating platform (Tinder-like)

Tech Stack: Nest.js, PostgreSQL, Redis, Websockets, React, Redux, AWS (EC2, S3, Cloudfront), Swagger.

Responsibilities & Achievements:

Acted as a primary technical engineer for foreign clients, preparing full project estimations and
pricing documents, providing live project demos.

Led backend deployment and development end-to-end, owning architecture decisions and drove
project to feature-ready stage.

Integrated and configured all third-party services from scratch, including navigating vendor
verification and compliance processes — required due to the platform's dating domain restrictions.

Implemented core features from scratch, real-time communication and notification systems,
instagram-like stories and posts. Designed an advanced JWT authentication system with social sign-
in support (Google, Facebook, Apple, WhatsApp) via Firebase Auth service.

Built an advanced moderation and reporting system with AI-powered media validation across all
user-generated content — avatars, chat attachments, posts, stories, and profile media.

Ekreative | Full-Stack Engineer (backend-focused) January 2023 - March 2024
Project: Serverless CMS builder with external SaaS database

Tech Stack: Express.js / Koa.js, PostgreSQL, Websockets, React, GraphQL, Swagger, Jest.

Responsibilities & Achievements:

Quickly adapted to the project, picking up new technologies on the go.

Developed core backend functionality, handling business logic, and third-party SaaS database
integration.

Worked directly with database migrations to restructure and optimize query workflows.

Conducted 1-on-1 onboarding sessions for new developers joining the project.

Education
Se ptember 2020 - June 2024 Bachelor of Information Technologies and Systems,

Cherkasy State Technological University.

Telegram: @certatium Burgas, Bulgaria
Github: www.github.com/certat1um [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація»)