Marco Arjona
@marcoarjona
I’m a Senior Software Engineer building scalable full-stack systems with React and .NET.
SpainWhat I'm looking for
I’m a Senior Software Engineer with 10+ years of experience building scalable, full-stack systems. I love turning complex requirements into reliable architectures—clean UI architecture, resilient REST APIs, and maintainable codebases.
Over the years, I’ve delivered end-to-end solutions using React, React Native, C#, .NET, and Python, while optimizing performance-critical applications. I’ve architected high-availability systems with MongoDB and Redis, and designed scalable patterns that keep teams moving fast.
On the product side, I currently lead the end-to-end development of a real-time mobile dating application, covering architecture, security, deployment planning, and quality. I implemented security with JWT rotation, Argon2id hashing, 2FA, and Redis—then automated CI/CD using GitHub Actions and Docker, backed by load testing for 50,000+ users.
Previously, I’ve built performant frontend UI systems for AAA game titles with Frostbite, improved workflows for distributed teams, and refactored legacy interfaces to cut technical debt by 30%+. I also have hands-on backend experience in containerized REST services and CI/CD adoption, so I can connect UI, services, and operations without friction.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
Solo Developer
Jan 2025 - Present (1 year 5 months)
Led end-to-end development of WildSoul, a real-time mobile dating app, using React Native, Express, MongoDB, and Socket.io; load tests validated scalability for 50,000+ users. Implemented security with JWT rotation, Argon2id hashing, 2FA, and Redis, and automated deployments via GitHub Actions and Docker.
Senior Software Engineer (Contract)
Various Clients
Jan 2022 - Present (4 years 5 months)
Provided senior engineering consulting to gaming clients, architecting modular, state-driven UIs and leading REST API integrations to sync client-server data reliably. Modernized legacy frontends, cutting technical debt by over 30%, while resolving production performance bottlenecks and defining API contracts with backend teams.
Unity3D Programmer
Focal Systems
Jan 2021 - Jan 2022 (1 year)
Developed and optimized a high-performance, real-time 3D simulation tool in Unity, improving rendering efficiency and data-driven logic. Optimized Unity rendering pipelines to achieve a 40% improvement in frame rates and built a JSON-driven system for dynamic scenario configuration.
Engineered performant frontend UI systems for AAA game titles using the Frostbite engine in a large distributed production environment, integrating UI with backend services and live-game data pipelines. Optimized UI workflows and tooling, accelerating delivery for a 15+ person engineering team, while meeting flagship release deadlines in agile cross-functional teams.
Backend Engineer
Saber Interactive
Jan 2017 - Jan 2018 (1 year)
Built scalable, containerized backend services and high-throughput REST APIs to support live-service games using MongoDB and Redis for critical game data. Improved scalability and deployment consistency with Docker and led Jenkins CI/CD adoption to automate builds and deployments.
Junior Data Scientist
LabCave Games
Jan 2017 - Jan 2017 (0 months)
Developed data extraction and analysis pipelines to inform mobile game strategy, focusing on web scraping and API development. Built Python APIs and automated performance reports and event-based analysis to influence product strategy decisions.
Full-Stack Engineer
Unlimiteck
Jan 2016 - Jan 2017 (1 year)
Developed early-stage mobile products by building cross-platform iOS and Android apps with Xamarin and backend services with Django. Engineered REST APIs to support mobile product features.
Education
Degrees, certifications, and relevant coursework
Universidad Politécnica de Madrid
Master of Science in Game Design & Development, Game Design & Development
MSc in Game Design & Development from the Universidad Politécnica de Madrid, providing specialized knowledge for complex interactive experiences.
Universidad Politécnica de Madrid
Bachelor of Science in Computer Science, Computer Science
BSc in Computer Science from the Universidad Politécnica de Madrid.
Availability
Location
SpainAuthorized to work in
Job categories
Skills
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