Senior Software Engineer.
Remote product teams.

15+ years shipping backend and full-stack products with ownership from architecture to production. I focus on distributed systems, reliability, and pragmatic delivery for startups and product companies working in async, remote environments.

Contact Download CV
YEARS EXPERIENCE
PLATFORM USERS
ADS MANAGED
TEAM LED
Santi Márquez

CAPABILITIES

Technical Stack

Architecture & System Design

REST APIsSystem designStrategy patternDomain modellingValidation standards

Backend

PHP (Symfony, Laravel)Node.js (Express, Sequelize)RESTPHPUnitComposer

Frontend

Vue.jsGatsbyBootstrapSPA architecture

DevOps

DockerRabbitMQRedisSolrJenkinsBitbucket PipelinesRancherAWS (RDS Aurora, EC2, ELB, WAF)CI/CD

AI / Data

MongoDBMySQLAirflowMatomoMetabase

JOURNEY

Experience Timeline

Remote · 5 years

Senior Software Engineer / Tech Lead · AlertaCoches.es

Vehicle ads platform at production scale. Set technical direction, shipped hands-on across Laravel, Vue, Node.js, RabbitMQ, MongoDB, MySQL, and Airflow, and helped a remote team of 4 deliver reliably.

Team: 4 · 11M ads, 750K active, 38K MAU, 1.1K regs/month

  • • Defined and managed product roadmap; led team of 4 (infrastructure, dev, marketing, sales); Jira epics and legal coordination.
  • • Mentored and onboarded; code reviews, unblocking, full-stack technical guidance.
  • • Laravel + MySQL (CMS), Node.js (Express + Sequelize) for APIs; Carfax + Cloudflare integrations; MongoDB for 3M ads/day.
  • • RabbitMQ queues for processing and email; caching for listings and filters; Airflow pipelines; Matomo + Metabase analytics.
  • • 6 Hetzner VPS, Docker, Rancher; CI/CD via Bitbucket; high availability, security, and performance ownership.
Remote · 3.5 years

Senior Backend Engineer · InterNations GmbH

5M+ user platform. Built backend services, supported SPA migration, shaped architecture decisions, and owned deployments in a remote product environment.

5M+ users

  • • Led migration of monolith areas to SPA; refactored core endpoints for Activity Group workflows.
  • • Redesigned Activities/Events with Strategy-based architecture; improved extensibility and domain clarity.
  • • Defined platform-wide validation standard (FosRest → Symfony Validator).
  • • Architected Notification Center: hydration, response modelling, async auto-deletion.
  • • Stateless REST in PHP 8 (activities, events, SEO); unit/integration/acceptance tests; principal backend reviewer.
  • • Primary owner of deployment go/no-go; coordinated deployment owners; formal procedures; high-risk releases and first-line incident support.
  • • Mentored new developers; technical lead for Gatsby SEO migration, Expat Insider, Magazine; facilitated retros and sprint planning.
Remote · 1 year

Software Analyst & Senior Backend Engineer · Enterticket

Ticketing platform in Spain. Delivered backend systems on AWS and worked directly with clients and partners in Chile and the US, balancing product needs with implementation.
  • • Led partner/client communication (Chile, US); translated business needs into specs; prioritised Jira sprints.
  • • PHP 7, Docker, Git, CI/CD on Bitbucket for enterticket.es.
  • • Improved reliability and scalability on AWS: RDS Aurora, EC2, ELB, WAF.
Hybrid · 6 years

Fullstack Engineer · GtMotive

Automotive software platform. Owned complex full-stack delivery on Colossus, Laravel + MySQL development, and Oracle integrations.
  • • Led Colossus project: automated manual workflows for Data Acquisition; software/hardware requirements.
  • • Identified bottlenecks, roadmap for high-impact improvements and cost savings.
  • • Technical requirements, effort estimation, scalable technology proposals.
  • • Laravel + Bootstrap, MySQL Workbench, Oracle integrations, Git.

PORTFOLIO

Featured Projects

AlertaCoches.es — car listing

AlertaCoches.es

Three-repo architecture (web, worker, Airflow), event-driven with RabbitMQ. Built for 12M+ ads, ingestion pipelines, and production-scale search.

Scale Solutions
The Last of the Snacks — multiplayer card game

The Last of the Snacks

Real-time browser game for 4–8 players: hidden roles, turn-based cards, WebSockets. Monorepo: Next.js 14, Fastify, shared TypeScript, Zod, Docker/Traefik.

Real-time
Santi Márquez

santimarquez.es

AI-assisted development workflow with Cursor, structured context, reusable prompts, and consistent delivery patterns.

Performance

CONNECT

Open to remote product teams.

Interested in Senior Software Engineer roles in EU remote startups and US product companies, especially backend or full-stack positions with distributed systems, product ownership, and visible business impact.