Mario Jose Maurello

Full-Stack Software Engineer

Madrid, Spain · Eligible to work in the EU
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Summary

Full-Stack Engineer with 8+ years building and shipping production web applications across React, TypeScript, PHP, and AWS. Strong end-to-end ownership across frontend, APIs, CI/CD, and cloud infrastructure, and experience leading a cross-functional team of 6 (developers and QA) through agile delivery. Recent work includes production client apps and developer SDKs with high reliability requirements, which is experience that transfers well to any product-focused engineering team.

Experience

  • Full-time parental leave / caregiving

    Madrid

    June 2026 – Present

  • Software Engineer

    Opslayer · Madrid · Remote

    June 2023 – June 2026

    • Owned end-to-end development of production React/TypeScript apps for Web3 products, including wallet connectivity, cross-chain bridging, and on-chain analytics.
    • Built bridging SDKs that abstracted multi-system integrations for consuming teams, reducing integration complexity and improving developer experience.
    • Shipped wallet-connected product features and on-chain data querying across Polkadot/Substrate and EVM ecosystems.
    • Implemented CI/CD pipelines with GitHub Actions, improving deployment reliability and reducing downtime.
    • Operated and supported AWS infrastructure, maintaining 99.9% service uptime.
    ReactTypeScriptNext.jsAWSGitHub ActionsPolkadot.jsWagmiEthers.jsViemSolidity

  • Software Engineer

    Purestake · Madrid · Remote

    October 2021 – June 2023

    • Built and maintained production React applications with complex third-party and contract integrations.
    • Designed and maintained blockchain bridging SDKs that improved developer adoption and integration speed for partner teams.
    • Migrated web app infrastructure to AWS serverless services, reducing deployment times and operational complexity.
    ReactTypeScriptAWSEthers.jsViemWagmiSolidity

  • 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 / Full Stack Developer

    Imaweb · Madrid

    February 2017 – March 2021

    • Project Manager (December 2019 – March 2021)
    • Project Leader (July 2019 – December 2019)
    • Full Stack Developer (August 2017 – July 2019)
    • SQA Developer (February 2017 – August 2017)
    • Progressed from SQA Developer to Full Stack Developer, Project Leader, and Project Manager on automotive CRM products.
    • Managed a cross-functional team of 4 developers and 2 QA testers; delivered 20+ releases on time and improved customer satisfaction by 25%.
    • Built core CRM modules used by 500+ European car dealerships; integrated REST/SOAP APIs and tuned MySQL performance.
    • Refactored legacy PHP and optimized queries, reducing page load times by up to 60%.
    PHPMySQLAgileJiraREST APIs

Earlier Roles

Education

Skills

Core Skills

  • Full-stack web application development and hosting
  • Service integrations (REST APIs, WebSockets, SDKs)
  • CI/CD pipelines, automated testing, and QA
  • Cloud infrastructure and deployment automation (AWS)
  • AI-assisted development (design, testing, and shipping)
  • Agile delivery and cross-functional collaboration
  • Domain experience in Web3 / dApps (Polkadot and EVM)

Frontend

TypeScriptReactNext.jsAstro

Backend

Node.jsPHPSymfonyLaravelGraphQL

Cloud & Tooling

AWSGH ActionsDockerPlaywrightVitestJestPostman

Data

MySQLSQL ServerPostgreSQLDynamoDBDrizzleSupabase

Web3

Polkadot.jsWagmiEthers.jsViemSolidity

Collaboration

GitHubGitLabJiraConfluenceNotionFigma

Certifications

Languages

SpanishNative
EnglishAdvanced

Recent Work

Production dApps built at Opslayer — representative of recent end-to-end ownership.

Moonbeam Foundation dApp

Opslayer · Owned end-to-end development

EVM-compatible dApp for the Moonbeam ecosystem, with wallet integrations, cross-chain bridging, and on-chain interactions across the network.

Moonbeam Foundation dApp screenshot navigation

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Tanssi Network dApp

Opslayer · Owned end-to-end development

Web application for the Tanssi appchain ecosystem, including wallet connectivity, cross-chain bridging, and on-chain data flows.

Tanssi Network dApp screenshot navigation

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Contact

Interested in working together? Send a message and I'll get back to you.