08/24/2026 updated

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Senior Backend & AI Engineer · Java/Quarkus · MCP servers, agent frameworks · GraalVM native

Murcia, Spain
Worldwide
Associate Degree of Software Engineering
Murcia, Spain
Worldwide
Associate Degree of Software Engineering

Profile attachments

Carlos_MG_CV_EN.docx

AI AgentsAWS SQSRAGGitHub CopilotGitHub ActionsTailwind CSSOpenTelemetryLLMJava (Programming Language)JavaScriptAmazon Web ServicesAmazon S3Atlassian JiraGoogle BigQueryConcurrent ComputingConcurrent EngineeringContinuous DeliveryContinuous IntegrationDistributed SystemsElasticsearchGitHubGoogle AnalyticsGoogle Cloud MessagingHibernateJava ArchitecturesSpring FrameworkJava API For RESTful Web Services (JAX-RS)WildFly (JBoss AS)JUnitPython (Programming Language)PostgreSQLApache MavenOAuthScrum MethodologyRabbitMQRedisMockitoPrometheusNext.jsSEO CopywritingSonarQubeSQL DatabasesTypeScriptEslintS3 BucketGoogle CloudReact.jsGrafanaConcurrencySpring BootGoogle FirebaseDistributed CacheBackendGitLabFastAPIEvent Driven ArchitectureBackend ProgrammingStripeAngularJSSlackPlaywrightGoogle Cloud FunctionsCloudflareReactive ProgrammingAtlassian BitbucketReact NativeDomain Driven DevelopmentApi GatewayElastic KibanaRestful ApiAmazon Simple Queue Service (SQS)Domain Driven DesignDockerJenkins
Senior backend and AI engineer with 5+ years delivering production systems end to end: Java/Quarkus services, Next.js frontends and the AI agent infrastructure that runs them - MCP (Model Context Protocol) servers, multi-language agent frameworks and evaluation harnesses, not agent demos. Measured results shipped in the last 12 months include +58% sustained platform capacity (330 to 520 rps), -45% p95 latency and -98% serverless invocations on live products. Previously core engineer on a distributed, high-concurrency platform serving 15M+ users, where I cut push notification delivery from 50ms to 1ms on average. Currently CTO and Tech Lead for two product companies, owning architecture decisions and defining how success is measured before work starts. Registered self-employed in Spain, working remotely with EU and US clients on senior contract engagements: 0 to 1 product delivery, LLM and agent integration into real products, and performance rescue on Java backends.

Experience

Professional experience5 - 10 years
Freelancer since2026

Languages

EnglishFluentSpanishNative speaker

Project history

Founder, CTO and Tech Lead

Javadaba

Internet & IT

< 10 team member

Independent product studio, Murcia, Spain.

  • Consolidated 10 applications and 99 modules (78 Maven, 21 pnpm) into a Turborepo/pnpm monorepo, unifying 307 REST endpoints under a shared build chain and removing duplicate React copies that caused runtime failures.
  • Designed seven domain-segmented CI/CD pipelines with real PostgreSQL and Redis in the integration suite and reproducible artifact publishing from CI rather than developer machines.
  • Architected a programmatic SEO system serving approximately 68,000 routes at constant build cost (794 prerendered pages plus on-demand ISR), reaching Total Blocking Time of 0-10 ms and Cumulative Layout Shift of 0.
  • Designed an MCP server tool surface that does not scale with the number of sources (4 constant tools, 55% of the context budget), selecting between two architectures by measurement after proving the alternative would publish 47 tools and fail to start at 45 sources.
  • Cut serverless invocations by 98% and billed compute by 75% on a real-time audio product by collapsing requests at the CDN and right-sizing per-function memory.
  • Build multi-language agent frameworks (TypeScript, Java, Python), visual tooling for agentic flows, and systems that turn expert judgment into reusable AI artifacts.

Stack: Java 25, Quarkus, GraalVM native, Next.js 16, React 19, TypeScript, Python/FastAPI, PostgreSQL, Docker, GitHub Actions, MCP.

Co-Founder, CTO and Tech Lead

Legally

Auditing, Taxes & Law

< 10 team member

Digital legal services platform on Java/Quarkus and Next.js, Murcia, Spain (remote).

  • Led the migration of a 103,000-line Next.js application from Pages Router to App Router while simultaneously introducing the Playwright end-to-end (E2E) suite the project did not previously have.
  • Made the E2E suite 5.2x faster (4m 12s to 48s) by redesigning the navigation pattern of a single spec that accounted for 31% of total suite time, preserving 100% of assertions.
  • Redesigned the E2E quality gate and removed approximately 8 minutes of CI per pull request: execution moved to the environment where real dependencies exist, with CI reading an attestation bound to the commit SHA that blocks merges when not green.
  • Diagnosed two production regressions invisible to the build pipeline after a Quarkus REST engine migration, including an endpoint returning a permanent 500 because a reactive return type pulled the entire filter chain onto the event loop; verified across 253 endpoint/method pairs with real authentication.
  • Built flow orchestration and automated cross-referencing of public data sources (official gazette, company registries) for business-opportunity detection: 285 REST endpoints, 66 entities and 108 versioned database migrations.

Stack: Java 21, Quarkus, Next.js 16, React 19, Tailwind 4, PostgreSQL, Liquibase, Playwright.

Senior Software Engineer

TuLotero

Goods & Retail

50-250 team member

High-volume transactional platform serving 15M+ registered users across Spain, Mexico and Colombia, with peaks in the thousands of concurrent users; core development and architecture across 22+ repositories inside a backend organization of about 40 engineers.

  • Worked on a Quarkus SPEI payments microservice handling approximately 40k transactions per day, and integrated a banking provider (Bancomer) from scratch, building custom fixed-position file mappers to their specification, with strict position handling and an event-based rollback mechanism for transaction recovery.
  • Ran the programmatic SEO / GEO initiative reporting directly to the CEO, and proposed the AI delivery workflows that became the company's starting point for using AI in engineering.
  • Delivered the end-to-end technical launch of the Colombian market (backend, CRM, microservices) and built core services for the Mexican market that were designed to apply across all countries.
  • Analysed Product/UX requirements directly, wrote the technical cards for backend and frontend teams, and took architectural decisions on complex business flows.
  • Applied distributed and local Redis caching and managed transactionality; reviewed other engineers' pull requests as a quality gate; shipped production deploys and hotfixes on 24/7 on-call rotations (L3 and L4).

Stack: Java 17, Jakarta EE, Spring Boot, Quarkus, WildFly, React, Next.js, AngularJS, PostgreSQL, RabbitMQ, Redis, FCM, AWS (Lambda, S3), CDN, Jira.

Co-Founder, CEO and Lead Developer

Traineer

Other

< 10 team member

Personal fitness training platform built to work the way top professional trainers do; product run end to end from concept and business strategy to architecture and implementation. Now discontinued.

  • Designed and built the full product from scratch: React Native mobile app, React/Next.js web platform and backend services, reaching 4,500 users and 7,000 downloads after the March 2024 Google Play release with minimal marketing spend.
  • Built a Node and Google Cloud Functions API gateway as the frontend-facing proxy, and integrated payments through the Stripe API on both Node and React Native plus the Google Payments API.
  • Built a custom clustering AI in Java, deployed on Google Cloud App Engine, and instrumented custom analytics events into BigQuery to drive UX decisions from real interaction data.
  • Built the traineer.net content platform in Next.js with custom Markdown parsers for SEO positioning.
  • Owned business strategy alongside execution, including positioning, pricing and go-to-market; selected as a founder for two UCAM entrepreneurship programs (HiTech Growth Program and HiTech CEO's Academy).

Stack: Java 17, Spring, Quarkus, React, React Native, Next.js, Node.js, TypeScript, Kotlin, Firebase, Google Cloud (App Engine, Cloud Functions, Pub/Sub, BigQuery, Storage, OAuth), Stripe API, Figma.

Software Developer

Accenture

Goods & Retail

>10.000 team member

Consulting engineering in Madrid, Spain across client delivery for DIA Group (e-commerce and retail platform, millions of users) and Accenture R&D.


  • Delivered across 15+ Quarkus microservices in a domain-driven architecture behind a Spring API gateway with caching and request multiplexing, and built the payment-methods and customer-address microservices from scratch, end to end.
  • Implemented the saga pattern for distributed transactions and reactive endpoints in Quarkus; built metadata tracking systems for big-data purposes, triggered by events such as login and purchase, traced through Pub/Sub and BigQuery, and versioned schemas with Liquibase.
  • Joined Accenture R&D, contributing Java middleware to SynOps, Accenture's proprietary ERP platform built around AI and big-data analysis, and owned the middleware layer of an AI-driven CRM for one of the largest vehicle-parts businesses globally (Stellantis).
  • Delivered 1,000+ Jira tickets across feature development and L4 support, analyzing cards independently and writing spike cards where the code needed investigation first.
  • Built an Elasticsearch bridge to recover and reprocess events in the backend, published API contracts for the web and mobile teams, and enforced quality gates with JUnit, advanced Mockito and Karate.

Stack: Java 11/17, Jakarta EE, Quarkus, Hibernate, Liquibase, JUnit, Mockito, Karate, Maven, Docker, Jenkins, GitLab, SonarQube, Elastic, AWS (SQS, SES), Pub/Sub, BigQuery. Agile: Scrum.

Software Developer

Capgemini

Automotive & Vehicle Manufacturing

>10.000 team member

Consulting engineering across three client engagements: Santalucia Insurance, Alphabet (BMW Group) and Telia Company. Joined as an intern, converted to a permanent developer role and promoted from the local account to an international team.

  • Developed a vehicle-shipment management system on Quarkus microservices with domain-driven design, containerization and cloud deployment, and migrated existing Spring services to Quarkus for a country-based European car-delivery product with per-location business logic.
  • Established the testing and quality practice on the codebase: JUnit at unit, integration and end-to-end level, mocking strategy, interface design, quality gates and code-smell thresholds; managed development and production server environments. In my first fully English-speaking international Scrum team, I took on informal coordination of the team's work as the delivery timeline tightened.
  • Maintained and operated legacy C++ services against IBM Informix despite a Java background, contributed to high concurrency systems for automatic affiliate royalty payments, built Java JSP back-office screens connected to external REST services for banks and law firms, automated Excel and CSV I/O, and resolved a high volume of L3/L4 tickets at the deepest escalation tier.

Stack: Java 8/11, Jakarta EE, Spring Boot, Spring Batch, Quarkus, C/C++, GraphQL, RabbitMQ, Oracle EBS, PL/SQL, IBM Informix, Azure, Kubernetes, Docker, Jenkins, SonarQube, Linux. Agile: Scrum, SAFe, Kanban.

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