yaroslavshumbar
Full Stack Software Engineer
Software engineer with 7+ years of experience building scalable web & blockchain applications. Led cross-functional teams to deliver high-impact projects, optimizing performance, cost, and user experience. Passionate about solving complex problems with elegant solutions—from real-time AI systems to decentralized apps. Proven ability to ship fast, mentor engineers, and drive innovation.
Experience: 4 years
Yearly salary: $70,000
Hourly rate: $35
Nationality: 🇺🇦 Ukraine
Residency: 🇺🇦 Ukraine
Experience
Backend Engineer
Inspify Pte Ltd 2020 - 2024
•Refactored 300+ legacy Lambda services from Java/Node.js to Rust, reducing execution time by 60% (avg. latency drop from 450ms to 180ms) and cutting AWS costs by 35%. •Designed 100+ new Rust-based Lambda services for real-time storybook analysis, processing 5M+ requests/month at <100ms P99 latency. •Migrated core storage to DynamoDB, leveraging GSI/LSI optimizations to improve query performance by 8x. •Automated CI/CD pipelines via Concourse, enabling zero-downtime deployments and reducing release cycles from 1 hour to 15 minutes
Full Stack Developer
ELITEX 2018 - 2020
•Built RESTful APIs/GraphQL services using Rust (Axum, Rocket, Actix-Web), handling 10K+ RPM with <50ms latency. •Developed microservices & serverless functions (AWS Lambda) in Rust, reducing cold-start times by 40% vs. Node.js. •Integrated third-party APIs (Google Maps, OAuth 2.0, Stripe/PayPal) for payments and geolocation, improving user conversion by 12%. •Created responsive UIs with React.js/Next.js, achieving 95+ Lighthouse scores for performance and accessibility.
Skills
ethereum
ethereumjs
evm
javascript
node
rust
solidity
typescript
web3js
solana
english
ukrainian