Enrique
Chyrnia
Backend · APIs & Integration · Cloud systems
I build backend for web systems: APIs, integration with external services, data, and cloud deployment. I work API-first and write down technical decisions with their trade-offs.
01Who I am and how I work
Software developer focused on backend, APIs, and integration. I like being in the whole cycle, from modeling the data to seeing the system deployed and running.
I work API-first: contract first, code second, so frontend and backend can move forward in parallel without stepping on each other. Decisions get written down with their alternatives and trade-offs, so anyone on the team can pick them up later.
I'm still studying computer engineering; what I know comes from building and running real systems.
02Technologies I work with
Backend & architecture
- Java · Spring Boot
- Modular architecture
- REST APIs
APIs, contracts & integration
- OpenAPI · contract-first
- Webhooks
- Message queues
Data & persistence
- PostgreSQL
- PostGIS · geospatial
- Object storage · Redis
Security & identity
- JWT · roles
- Spring Security
- Federated authentication (OAuth/OIDC)
Cloud, deployment & DevOps
- AWS · Docker
- Terraform
- CI/CD
Frontend (secondary)
- TypeScript
- React · Next.js
About the frontend: it's a secondary contribution; on several modules the interface was built by someone else on the team while my focus was the backend. PostGIS is PostgreSQL's geospatial extension (proximity search and location-based filters).
03Work experience — Backend & infrastructure
I worked at a private company in the digital services industry, in charge of backend and technical infrastructure on an operational platform with applications for users, professionals, and the internal team. Three areas fell to me: backend architecture and cloud infrastructure, user registration, and the internal team's backoffice.
For confidentiality, this case is presented anonymized: it doesn't include real names, source code, internal data, credentials, private screens, or exact architecture.
View work experience →04My own product, end to end
Social media analytics platform for marketing agencies: it centralizes Instagram, Facebook, and TikTok metrics, keeps its own day-by-day history, and builds reports per client. I designed, built, and deployed it myself: backend, frontend, integrations, and the infrastructure on Vultr and Cloudflare.
View project →Multi-tenant SaaS for inventory, sales, and point of sale, aimed at small retail in Paraguay: weighted-average costing, immutable sale snapshots, multi-currency, and an offline-first POS. I designed and built the backend and its infrastructure: tenant isolation with PostgreSQL Row Level Security that fails closed, encrypted backups with a production-tested restore, and 49 documented technical decisions.
View project →