Yehor

Egor Kravchenko
Backend Engineer (Node.js/NestJS)
Phone [open contact info](look above in the "contact info" section)
E-mail [open contact info](look above in the "contact info" section)
GitHub github.com/kravchenkoegorii
LinkedIn [open contact info](look above in the "contact info" section)
Telegram t.me/TheEgor K
Location Dnipro, Ukraine

Skills
Technical: JavaScript, TypeScript, Node.js, Express.js, Nest.js, React.js, GraphQL, WebSockets,
REST API, various ORMs, SQL;
Architecture: Backend architecture design, Microservices, Event-driven architecture, Database
schema design, Design patterns;
Databases: PostgreSQL, MySQL, Redis, MongoDB, Supabase;
Integrations: Stripe, RevenueCat, Apple Pay, Google Pay, Payment providers, OpenAI API, Ele-
venLabs API;
Messaging: Kafka, RabbitMQ;
Testing: Jest, Integration testing, API testing;
DevOps: Docker, GitHub Actions, GitLab CI/CD, AWS;
Observability: Structured logging, Sentry, Prometheus/Grafana;
Domains: FinTech, Healthcare, EdTech, E-commerce, Web3;
Tools: Cursor, Claude Code;
Languages: English (B2), Ukrainian (Native)

Work Experience
• Backend Engineer
SDA
Sep 2025 – Present
– Delivered backend services for a fintech rewards platform (cashback, bonus programs,
merchant onboarding, KYC, Stripe payments)
– Designed backend modules for push notifications, marketing campaigns, and
merchant/customer lifecycle flows
– Implemented backend capabilities for internal healthcare analytics dashboards
– Integrated WellSky and QuickBooks to unify operational and financial analytics flows
– Delivered backend features for a child-focused mobile product: legal document versioning,
content management, and compliance workflows
– Integrated RevenueCat subscriptions and ElevenLabs AI features into product workflows
 – Designed n8n ingestion pipelines from Notion and Google Drive into internal systems
– Implemented retryable background jobs for content processing (S3 uploads, Mux video
processing, Sentry monitoring)
– Built scalable worker services with per-worker concurrency for video, audio, and photo
processing during large migrations
– Led large-scale migration for 3,000+ lessons across 100+ countries from Google Drive to S3,
including 500MB–5GB media assets
– Deployed and operated a self-hosted Supabase stack
– Mentored two junior engineers through code reviews and technical guidance
– Collaborated with clients on backend architecture decisions and delivery planning

• Backend Developer
Cowchain
Nov 2024 – Aug 2025 (10 months)
– Contributed to backend architecture and designed data models for multi-network
blockchain products from initial delivery stages
– Implemented event-driven microservices with message queues to improve scalability and
fault isolation
– Integrated LLM-powered features into user-facing and operational workflows
– Delivered blockchain integrations across EVM-compatible networks, Solana, and Bitcoin
– Integrated and maintained third-party DeFi protocols, including Aerodrome and Velodrome
– Designed and shipped NFT platform modules, including minting and rewards logic
– Diagnosed and resolved critical smart-contract integration issues to improve production
stability
– Built and maintained indexing pipelines and subgraphs for near real-time analytics
– Contributed to engineering execution through code reviews, task estimation, and sprint
planning

• Backend Developer
Peanut Trade
Dec 2023 – Nov 2024 (1 year)
– Developed and scaled Node.js microservices for a high-load distributed trading platform
– Designed chain-specific deployment topologies for throughput, fault tolerance, and service
isolation
– Implemented Redis caching for tokens and other market data to reduce latency and external
API pressure
– Reduced inter-service serialization overhead by migrating selected services from JSON to
MessagePack
 – Designed and maintained REST and WebSocket APIs for real-time market and execution
data
– Reworked backend queries and indexing for an internal CRM dashboard, cutting page load
time from 2–3 minutes to 30 seconds
– Improved production reliability through incident response, root-cause analysis, and
Prometheus/Grafana observability
• Backend Developer
DiExp-Tech
Aug 2022 – Nov 2023 (1 year 4 months)
– Integrated Google Pay, Apple Pay, Bit, and Stripe to expand payment coverage and improve
checkout reliability
– Optimized backend and frontend modules to improve application performance and
responsiveness
– Implemented Amazon S3 integration for media storage workflows
– Deployed and maintained Node.js services on AWS Elastic Beanstalk
– Developed backend services for restaurant management, offers, and real-time chat
workflows
– Built and maintained GitHub Actions pipelines for build, test, and deployment automation
– Designed database schemas and contributed to system architecture decisions

Education
University Degree Location and Period of Study
Oles Honchar Dnipro National M.S. in Software Engineering, Dnipro, Ukraine
University Expected Dec 2026
Oles Honchar Dnipro National B.S. in Software Engineering, Dnipro, Ukraine
University Graduated Jun 2025