Mario Jose Maurello

Full-Stack Software Engineer

Madrid, Spain · Eligible to work in the EU
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Summary

Full-Stack Engineer with 9+ years of end-to-end ownership shipping production web applications across React, TypeScript, PHP, and AWS. Comfortable working across the stack as a generalist: frontend, APIs, CI/CD, cloud infrastructure, and the product decisions that come with owning a feature from idea to production. Recent work includes client apps and developer SDKs with high reliability requirements in fast-paced product environments. Also experienced leading a cross-functional team of 6 (developers and QA) through delivery.

Experience

  • Full-Stack Software Engineer

    Purestake / Opslayer · Madrid · Remote

    October 2021 – June 2026

    • Early-stage, fast-paced Web3 startup; continued on the same team after Purestake spun out Opslayer (ops and web apps).
    • Owned the Moonbeam and Tanssi web apps end to end (React, TypeScript, Next.js): staking, governance, bridging, and proxies, with wallet connectivity for MetaMask, Talisman, WalletConnect, and other wallets.
    • Made the product and UX decisions on those flows so users got coherent paths instead of chain-by-chain one-offs.
    • Built Moonbeam's public bridging SDKs, @moonbeam-network/xcm-sdk for Polkadot transfers and @moonbeam-network/mrl for Ethereum routes, abstracting that complexity for consuming teams. Shared chain config and signers across both, with docs, examples, and starter guides so integrators could adopt one route set without the other.
    • Co-owned a Node.js data service (AWS serverless, DynamoDB, TanStack Query) that collected on-chain and indexer data and served it to the Moonbeam and Tanssi apps.
    • Set up GitHub Actions CI/CD and automated tests with Playwright and Vitest.
    • Migrated web app infrastructure to AWS serverless and operated production services at 99.9% uptime.
    ReactTypeScriptNext.jsNode.jstRPCTanStackJotaiPostgreSQLDrizzleAWSGitHub ActionsPlaywrightVitestPolkadot.jsWagmiEthers.jsViemSolidity

  • 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-native development with coding agents, including multi-agent orchestration across design, implementation, testing, and shipping
  • Agile delivery and cross-functional collaboration
  • Domain experience in Web3 / dApps (Polkadot and EVM)

Frontend

TypeScriptReactNext.jsTanStackJotaiAstro

Backend

Node.jstRPCPHPSymfonyLaravelGraphQL

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.