Mario Jose Maurello

Experience

• Software Engineer — Web3 Developer

  Opslayer · Madrid · Remote

  June 2023 – Present

  • Owned development of both Polkadot/Substrate-based and EVM-based dApps, integrating Web3 wallets and on-chain data analytics.
  • Integrated and maintained dApps with Polkadot.js API for interacting with Substrate-based blockchains, enabling real-time querying of on-chain data and transaction signing.
  • Built bridging SDKs to facilitate seamless token transfers across EVM-compatible chains and Substrate chain, removing the complexity for users of interacting with smart contract and Substrate interfaces.
  • Implemented CI/CD pipelines with GitHub Actions, improving deployment reliability and reducing downtime.
  • Provided ongoing infrastructure support via AWS, achieving 99.9% service uptime.
  ReactTypeScriptNext.jsPolkadot.jsWagmiEthers.jsViemSolidityGitHub ActionsAWS

• Software Engineer

  Purestake · Madrid · Remote

  October 2021 – June 2023

  • Developed and maintained decentralized applications (dApps) using React, Ethers.js, Viem, Wagmi, and interactions with Solidity contracts.
  • Designed and maintained SDKs for blockchain bridging, resulting in improved developer integration in the Polkadot ecosystem.
  • Migrated web apps infrastructure to AWS server-less services, reducing deployment times and complexity.
  ReactTypeScriptEthers.jsViemWagmiSolidityAWS

• Full Stack Developer

  Digimobil · Madrid

  April 2021 – October 2021

  • Developed internal logistics management web application to track and optimize inventory movement, reducing manual workload by 50%.
  • Built RESTful APIs in PHP (Symfony), interfacing with SQL Server for real-time data tracking.
  • Improved application security by implementing user authentication and role-based access control.
  PHPSymfonySQL ServerREST APIs

• Project Manager

  Imaweb · Madrid

  December 2019 – March 2021

  • Managed a cross-functional team of 4 developers and 2 QA testers in the agile development of CRM solutions for automotive clients.
  • Delivered 20+ project releases on time and within budget, improving customer satisfaction scores by 25%.
  • Acted as primary liaison between clients and technical teams, translating business needs into functional requirements.
  • Introduced sprint retrospectives and kanban boards, leading to a 15% productivity increase.

• Project Leader

  Imaweb · Madrid

  July 2019 – December 2019

  • Supervised development of custom modules for automotive CRMs, reducing feature request backlog.
  • Mentored junior developer and QA tester, resulting in quicker onboarding and quality improvements.
  • Ensured adherence to deadlines and code quality standards during high-priority client rollouts.
  PHPMySQLAgileJira

• Full Stack Developer

  Imaweb · Madrid

  August 2018 – July 2019

  • Built core modules for a CRM platform used by over 500 car dealerships across Europe.
  • Integrated third-party systems using REST/SOAP APIs, enhancing data flow across platforms.
  • Wrote backend services in PHP, managing relational data in MySQL and performance tuning SQL queries.
  PHPMySQLREST APIsSOAP

• SQA Developer

  Imaweb · Madrid

  August 2018 – July 2019

  • Refactored legacy PHP code and optimized MySQL queries, reducing page load times by up to 60%.
  • Collaborated with development teams to triage and resolve bugs reported from production.
  PHPMySQL