Arnau – Typescript, React, Node.js

An accounting-sector client needed custom software for it's community members. Working part-time through an agency, I independently developed two full-stack applications: an interactive community game and an LLM prompt-management dashboard that allowed users to browse, copy, and customize prompts.

• Delivered two full-stack applications from initial requirements to production-ready functionality;
• Translated the client’s business requirements into application architecture and development tasks;
• Built an interactive game designed to increase participation within the client’s community;
• Developed a prompt-management dashboard for browsing, copying, and modifying LLM prompts;
• Implemented CRUD functionality for creating, editing, and deleting prompt content;
• Designed the PostgreSQL schemas and application data flows;
• Implemented authentication and protected application areas with Clerk;
• Developed responsive interfaces with React and Next.js;
• Maintained the applications and delivered iterative improvements based on client feedback.

A platform that provides non-custodial liquidity-locking infrastructure for DeFi projects. The role involved work across its Solana stack, developing on-chain programs, indexers, SDK functionality, and the web application used to create and manage Raydium and Meteora liquidity locks.

• Contributed Rust code to production Solana programs built with Anchor and Pinocchio;
• Developed the on-chain program and web integration for Meteora DLMM liquidity lockers;
• Implemented liquidity-locking functionality for Raydium AMM, CPMM, and CLMM pools;
• Built Rust-based indexers with Carbon to process program events and maintain application state;
• Created the Solana web application from scratch with Next.js and tRPC;
• Integrated on-chain programs, indexers, and wallet transaction flows;
• Implemented transaction retries, instruction optimization, and serialization;
• Contributed to the TypeScript SDK and automated test suites.

A decentralized RPC infrastructure platform that provides private and reliable access to multiple blockchain networks. I developed backend services responsible for payments, blockchain monitoring, RPC observability, and operational notifications.

• Designed and implemented microservices for payment processing and blockchain event monitoring;
• Built observability services for monitoring RPC infrastructure and service health;
• Developed Slack and email notification systems for operational events;
• Maintained and extended production REST APIs written in TypeScript and Rust;
• Designed data flows using PostgreSQL and Redis;
• Contributed to Solidity smart contracts deployed across EVM networks;
• Maintained Dockerized services, CI/CD pipelines, and AWS deployments;
• Investigated and resolved production incidents;
• Reviewed code and mentored junior developers

A collection of Solana applications and internal tools, including an NFT staking dashboard with quests and season passes, a token faucet, and operational tooling for snapshots, whitelists, and airdrops.

• Led the development of an NFT staking dashboard that combined staking positions, quests, season passes, and airdrop-eligibility workflows in one application.
• Built a Solana SPL token faucet with server-side key management, allowing tokens to be created, minted, and transferred without exposing sensitive signing credentials to the browser.
• Developed NFT snapshot and whitelist tooling that automated the preparation of wallet lists for community campaigns.
• Implemented airdrop utilities for distributing blockchain assets across multiple eligible wallets.
• Decoded Solana account and transaction data into application-ready structures for frontend and backend use.
• Integrated Metaplex and Solana Web3.js functionality into TypeScript and Next.js applications.
• Designed data flows using MongoDB and PostgreSQL and supported application deployment through AWS.

An enterprise Manufacturing Execution System used to support and monitor industrial production workflows. The platform combined operator-facing interfaces, backend integrations, and SQL-based production data across international manufacturing environments.

• Developed AngularJS modules for operator-facing manufacturing workflows, extending the functionality available to production teams.
• Built and maintained .NET backend integrations that connected frontend modules with SQL Server production data.
• Implemented data access and business logic for features within an established MES architecture.
• Diagnosed issues across the frontend, backend, and database layers, improving the reliability of production-facing modules.
• Performed structured QA testing before releases, identifying integration and workflow issues before deployment.
• Produced technical documentation that helped international teams understand, operate, and maintain delivered functionality.
• Collaborated with distributed engineering and industrial teams through Agile planning, implementation, and review processes.