VALENTIN BALLESTEROS

Full Stack Engineer & Product Designer

From architecture to interface, I build scalable, production-ready systems optimized for performance and real-world scale.

Contact Me

Selected Work

A selection of products I've designed and built end-to-end.

AI Insights Platform, Intelligent Text Analysis for Product Teams

Web app that turns raw feedback, notes, or long-form text into summaries, keywords, categories, and suggestions, aimed at teams who want structured insight without a clunky workflow. Progress is easy to follow from start to finish, and there is a dedicated view to inspect how each analysis step runs when you want to go deeper.

  • Built an end-to-end flow from input text to structured results and recommendations
  • Designed background processing so the interface stays responsive while heavier work runs asynchronously
  • Added a transparency view for timelines, per-step timing, and decision detail for debugging and trust
  • Implemented with Vue, NestJS, and a queue-backed worker model that mirrors production-style pipelines

Designed to pair a polished product surface with observable, debuggable internals

GitHub→
AI Insights Platform preview

DamePelis, Scalable Media Streaming Architecture

Movie streaming platform powered by a complex web scraping pipeline for movies and subtitles, paired with a smooth and responsive animated React interface.

  • Built a scraping pipeline aggregating data from 10+ sources
  • Designed a backend architecture optimized for high read traffic with aggressive caching
  • Scales to 50k+ concurrent users with minimal infrastructure changes
  • Implemented image caching with CDN delivery for fast asset loads
  • Auto-updating catalog that refreshes on-demand from user requests (no manual maintenance)

Designed to scale horizontally with minimal infrastructure changes

GitHub→Deploy→
DamePelis preview

DevHive, Collaborative Platform for Indie Game Development

Platform for indie developers to form teams, share progress, and collaborate through profiles, project spaces, devlogs, and feedback loops.

  • Built profile and team-creation flows to match developers by role and goals
  • Implemented project spaces with screenshots and threaded comments
  • Added devlog publishing to support iterative progress updates

Designed to improve team formation and shipping velocity for small studios

GitHub→Deploy→
DevHive preview

Systems & Engineering

I design and build production systems where architecture, reliability, and performance matter as much as features.

Tech Stack

ReactNext.jsTailwind CSSTypeScriptNode.jsNestJS / ExpressPostgreSQLMongoDBRedisAWSDockerVercelGitHub ActionsREST APIsWebSocketsMicroservicesEvent-drivenCachingReactNext.jsTailwind CSSTypeScriptNode.jsNestJS / ExpressPostgreSQLMongoDBRedisAWSDockerVercelGitHub ActionsREST APIsWebSocketsMicroservicesEvent-drivenCaching

Interfaces & Frontend Systems

  • Build responsive, high-performance interfaces with React & Next.js
  • Design smooth UI/UX with Tailwind and animation systems
  • Optimize rendering, loading states, and perceived performance

APIs, Services & Data Pipelines

  • Design REST APIs and scalable service architectures
  • Build data pipelines and scraping systems (multi-source aggregation)
  • Handle authentication flows (OAuth, sessions, access control)

Infrastructure, Deployment & Scaling

  • Design caching strategies for read-heavy systems
  • Deploy and manage production environments (AWS, GCP, Vercel, cloud)
  • Build CI/CD pipelines and monitoring setups

Engineering Approach

A structured approach from problem framing to production infrastructure.

01, Foundation

Define the Problem Worth Solving

Good engineering begins with clarity. Requirements, timelines, and constraints define what "good" actually means. Every architectural decision is grounded in product and business context.

  • Clarify scope, ownership, and success criteria
  • Separate fixed constraints from negotiable ones
  • Align technical direction with product reality

02, Architecture

Design for the Team

Architecture must scale with both the system and the people building it. Patterns and technologies are chosen based on stage, ecosystem maturity, and long-term maintenance cost.

  • Match complexity to product trajectory
  • Evaluate tools by total cost, not novelty
  • Optimize for maintainability and team continuity

03, Implementation

Ship Clean. Stay Pragmatic.

Production code should be clear, predictable, and resilient. Velocity and quality are aligned when unnecessary complexity is removed.

  • Favor readability over cleverness
  • Treat development speed as a design constraint
  • Build systems that are observable and deployable

Let's Build Something

I enjoy building scalable systems, designing product architecture, and turning ideas into real applications. If you think I could be a good fit for your team or project, feel free to reach out.

Available for freelance, contract, or full-time opportunities.

Email

TheNasky@gmail.com

GitHub

github.com/TheNasky

LinkedIn

linkedin.com/in/valentin-ballesteros

Location

Buenos Aires, Argentina