Fullstack Core Product Engineer

Plasma is a purpose-built blockchain for stablecoin payments. Engineered from the ground up to address the unique needs of stablecoins, Plasma provides a scalable, efficient, and secure foundation for the next generation of money movement. We believe stablecoins can transform global finance and improve financial access worldwide. To reach the next level of adoption, dedicated and purpose-built infrastructure is required.

We are looking for a Fullstack Product Engineer to join our product team and build the infrastructure and applications that power stablecoin payments. This role is primarily backend-focused, with work across APIs, services, and relevant integrations, with occasional support for frontend or mobile development. You will ship user-facing products, and contribute across the stack to deliver high-impact features quickly and reliably.

• Design and implement high-performance REST and GraphQL APIs for stablecoin payments and financial operations

• Integrate backend services with Plasma’s blockchain infrastructure using libraries like Web3.js and Ethers.js

• Build services to process blockchain events and maintain application state consistency

• Define and optimize database schemas for transactional throughput and financial data integrity

• Implement caching and indexing strategies for wallet balances and transaction history

• Develop WebSocket services to deliver real-time transaction updates to users and systems

• Create robust error handling and retry logic for blockchain and DeFi protocol interactions

• Set up performance monitoring, tracing, and alerting across backend services

• Collaborate with frontend engineers to define API contracts and support internal tooling development

• Build admin dashboards and internal tools for operations, customer support, and debugging

• Write clear API documentation and maintain backend support for frontend feature development

• 3+ years experience as a full stack engineer with a strong focus on backend development

• Proficient in TypeScript and JavaScript, with deep expertise in Node.js and API design (REST and GraphQL)

• Hands-on experience integrating blockchain infrastructure using Web3.js or Ethers.js

• Strong understanding of distributed systems, microservices, and asynchronous messaging (e.g. RabbitMQ, Kafka)

• Have a deep understanding of crypto UX patterns and interactions

• Skilled in relational databases like PostgreSQL and caching with Redis

• Comfortable working across the stack, with experience in React or similar frontend frameworks

• High attention to detail, with strong debugging and problem-solving skills in fast-paced environments

• A bias for action and ownership, capable of driving complex features from design through deployment

• Familiarity with core blockchain concepts including gas optimization, transaction lifecycle, wallet interactions, etc

• Experience with stablecoin protocols (USDC, USDT, DAI)

• Previous fintech or payments experience

• Experience with regulatory compliance in financial services

• Backend: Node.js, TypeScript, PostgreSQL, Redis

• Blockchain: Ethers.js, Web3.js, Hardhat

• Frontend: React, Next.js, TypeScript, TailwindCSS, TanStack Query

• Infrastructure: Docker, Kubernetes, AWS/GCP, Terraform

• Monitoring: Prometheus, Grafana, Elasticsearch, Sentry

• Development: GitHub, CI/CD pipelines, automated testing

Benefits for full-time employees include an above-market salary, a generous ownership package, comprehensive insurance coverage, and generous paid time off.