Sebastian Ortiz Valencia
Senior Fullstack Engineer
9+ years building end-to-end applications — from scalable APIs and cloud infrastructure to modern, responsive frontends. I turn complex requirements into clean, maintainable software.
About Me
I'm a senior software engineer with 9+ years of experience designing and building production systems across diverse industries. I work across the entire stack — from backend architecture (APIs, databases, distributed systems) to frontend development (Angular, React/Next.js) — delivering complete solutions end to end.
Core Focus
Full-Stack Architecture
Designing and delivering complete applications — API contracts, data models, frontend interfaces, and everything in between.
Backend Systems
REST APIs, relational databases, async processing, and distributed services with Python, Go, and C#.
Frontend Development
Building responsive, accessible interfaces with Angular, React/Next.js, TypeScript, and modern CSS frameworks.
Cloud & Infrastructure
Deploying and managing services on AWS, Google Cloud, and bare-metal servers with Docker and Nginx.
Event-Driven Design
Asynchronous pipelines with message streams, consumer groups, idempotent handlers, and full traceability.
DevOps & CI/CD
Automated builds, testing pipelines, containerized deployments, and infrastructure as code.
What Sets Me Apart
End-to-End Ownership
From architecture decisions to production deployment — I own the full lifecycle.
Clean, Justified Code
Every technical decision is deliberate, documented, and built to last.
Startup & Enterprise
Adaptable to fast-moving startups and structured enterprise environments alike.
Pragmatic Engineering
Solve the real problem. No over-engineering, no unnecessary abstractions.
Projects
Real-world demonstrative projects with serious architecture, clean code, and live deployments. Each one showcases different aspects of full-stack engineering.
NexusCRM
LiveMulti-tenant CRM with full-stack architecture
A lightweight multi-tenant CRM demonstrating SaaS architecture with JWT auth, role-based permissions, and a pipeline-driven sales workflow.
- Multi-tenant data isolation via organization_id
- JWT authentication with access/refresh tokens
- Role-based access control (Owner, Admin, Sales Rep, Viewer)
Event-Driven Onboarding
LiveAsynchronous processing with Go and Redis Streams
A service demonstrating event-driven architecture using Go and Redis Streams. Handles user onboarding through a chain of decoupled workers.
- Redis Streams consumer groups for reliable processing
- Correlation IDs for end-to-end traceability
- Idempotent event handlers with retry logic
Semantic Search API
LiveDocument intelligence with local embeddings
An API for uploading documents, processing them into chunks, generating embeddings with a local model, and performing semantic similarity search.
- Local embeddings with all-MiniLM-L6-v2 (zero API cost)
- Chunking pipeline with configurable overlap
- PDF and plain text document support
Skills & Stack
Backend
Frontend
Databases
Cloud & DevOps
Architecture
Messaging & Async
Testing & Quality
AI & Search
Get in Touch
Interested in working together? Feel free to reach out through the form below or connect via social links.