Accomplished Blockchain and Fullstack Developer with over 10 years of experience designing and optimizing high-performance decentralized applications (dApps) and scalable blockchain solutions. Specialized in building on Solana and Ethereum ecosystems with expertise in smart contract development using Solidity, Rust, and Web3.js. Proven track record of delivering efficient, secure protocols and applications, increasing transaction throughput by 25% and reducing gas costs by 30%. Demonstrated proficiency in deploying and managing blockchain nodes and infrastructure with Docker, Kubernetes, and AWS. Strong collaborator and mentor, consistently driving innovation and surpassing project goals through cutting-edge blockchain solutions.
Yearly salary: $120,000
Hourly rate: $60
Nationality: 🇵🇱 Poland
Residency: 🇸🇪 Sweden
Experience
Senior Blockchain Developer
Persol Process & Technology 2021 - 2024
Designed and developed blockchain-based supply chain solutions on Ethereum and Solana, enabling transparency and traceability of goods through decentralized ledgers. Built and deployed smart contracts for tokenization of assets and automated compliance checks using Solidity and Rust. Integrated blockchain technology with IoT devices for secure, real-time data sharing in decentralized networks. Conducted in-depth vulnerability assessments on 20+ smart contracts, implementing robust security measures that reduced incident response time by 60% and ensured compliance with industry standards. Collaborated with stakeholders to define technical requirements and implement blockchain strategies aligned with business goals. Led the optimization of transaction throughput and gas efficiency, improving network performance by 30%.
Senior Full Stack and Blockchain Developer
Red Badger 2019 - 2021
Developed scalable backend systems for decentralized applications (dApps) using Node.js, Go, and Ruby on Rails, processing over 10,000 daily blockchain transactions. Revitalized and optimized legacy smart contracts, reducing gas costs by 25% and enhancing performance for on-chain computations. Automated deployment pipelines for Solana and Ethereum nodes using Docker and Kubernetes, cutting release times by 30% and ensuring 99.9% node uptime. Collaborated with cross-functional teams to deliver blockchain projects 15% ahead of schedule, aligning with client expectations and improving efficiency.
Full Stack Developer
EL Passion 2016 - 2019
Built and deployed full-stack applications using Node.js and Go for backend and React and Vue.js for frontend, supporting 15,000+ daily transactions. Created and optimized RESTful APIs, improving data processing speed by 15% and reducing API response time by 25%, leading to better system performance. Teamed with frontend engineers to enhance user interface components, boosting engagement by 20% and reducing bounce rates by 15%.
Junior Full Stack Developer
10Clouds 2014 - 2016
Assisted in developing web applications using Ruby on Rails and JavaScript frameworks, focusing on RESTful API development and database schema design. Contributed to development sprints, improving code quality through unit testing, reducing bugs by 15% during QA.
Skills
agile
angular
api
aws
ci-cd
docker
git
golang
jira
kubernetes
mongo
nextjs
node
postgres
python
rust
solidity
typescript
vue
solana
