Adrian Calcinas

Full Stack Developer

Freelance · Cochabamba, Bolivia · Mar 2026 – Present

• Designed and built NexCore, a custom multi-tenant ERP suite for a retail-sector client, as the sole end-to-end developer. Product delivered and under active maintenance.
• Covered the full cycle: a distributed architecture of 5 services, an Angular 22 SPA, OAuth2/OIDC security, and continuous deployment (technical detail in the Projects section).

Full Stack Developer

Departamento de TI — UAB · Cochabamba, Bolivia · Aug 2025 – Mar 2026

• Built the entire backend from scratch with .NET 10 and the Angular 18 frontend module, replacing a legacy system and cutting evaluation management time 3x for 5,000+ users and 300+ evaluations of different types.
• Built the frontend module with advanced Angular 18 patterns: signals, reactive effects, standalone components, and custom RxJS operators.
• Worked under Extreme Programming (XP) practices: continuous integration, constant refactoring, and a focus on quality, testable code.
• Implemented Clean Architecture with Repository Pattern, Result Pattern, and Minimal APIs, achieving high cohesion and low coupling between layers.
• Integrated the external academic subsystem via typed HttpClient + Polly, with exponential retries and a circuit breaker, ensuring resilience against network failures in production.
• Automated deployment with GitHub Actions via WebDeploy, with federated OpenIddict authentication and structured logging with Serilog.

Junior Full Stack Developer

IATec · Cochabamba, Bolivia · Feb 2025 – Jul 2025

• Designed and implemented an enterprise solution with Angular 19 and .NET 8 Web API, using layered architecture and separation of concerns.
• Maintained and fixed bugs in legacy Angular 10 applications, working with multiple framework versions in parallel.
• Collaborated on a team using Scrumban methodology, combining iterative planning with continuous task flow and frequent deliveries.
• Built a secure RESTful API with Microsoft Identity Web and Azure AD for corporate SSO, syncing profiles via Microsoft Graph.
• Integrated ZKTeco biometric devices with real-time attendance capture and synchronization.
• Implemented RBAC access control with granular permissions over assets and resources.
• Set up CI/CD in Azure DevOps with automated build, test, and deployment.

Teaching Assistant — Programming

Universidad Adventista de Bolivia · Cochabamba, Bolivia · Jun 2024 – Dec 2024

• Developed RESTful APIs with .NET Core and Django for scalable web applications.
• Implemented the frontend with Next.js and deployed with Docker in production, cutting deployment time by 30%.
• Integrated AI components and optimized relational databases to improve performance.
• Mentored 50+ students in development, architecture, and programming best practices.

Junior Full Stack Developer

Freelance · Cochabamba, Bolivia · Jan 2024 – Jun 2024

• Built an SCM system for bookstores and stationery shops with Angular and a .NET backend, integrating RESTful APIs, lazy loading, and modularization that streamlined processes by 25%.
• Designed intuitive, responsive interfaces, improving UX and visual consistency.

NexCore — Multi-tenant ERP suite

Mar 2026 – Present

Custom ERP suite for a retail-sector client: 5 distributed services built end-to-end as the sole developer. Product delivered and under active maintenance.

• Angular 22 SPA with standalone components, signals, and full lazy loading, including a 27-screen WMS module.
• Distributed architecture: business API, own OAuth2/OIDC Authorization Server on OpenIddict, Backend-for-Frontend, and orchestration with .NET Aspire.
• API with Clean Architecture, CQRS, and polyglot persistence with EF Core and Marten (Event Sourcing) on PostgreSQL.
• Production-grade security: PKCE, rotating refresh tokens, Token Exchange, and fine-grained RBAC, with server-side sessions via the BFF pattern.
• Multi-tenancy with per-tenant isolation, distributed caching with Redis and FusionCache, resilience with Polly, and distributed rate limiting.

Banking Platform — Full stack banking system

Feb 2025 – Jun 2025

End-to-end banking platform with a Spring Boot 3.4 (Java 17) backend and an Angular 19 frontend, covering account management, transactions, beneficiaries and role-based access with a clean architecture and containerized deployment.

• Decoupled full stack system: frontend with Angular 19, TypeScript, Bootstrap 5 and Signals; backend with Java 17, Spring Boot, JPA/Hibernate and MySQL, communicating asynchronously via HTTP.
• Secure authentication with session tokens and role-based access control (ADMIN, USER, OPERATOR, MODERATOR).
• Real-time transaction processing: deposits, withdrawals, transfers, payments and reversals with instant balance updates.
• Advanced multi-filter search with pagination, executive dashboards and system metrics.
• Complete audit trails and soft deletes to preserve data integrity.
• Fully containerized environment with Docker Compose and interactive API docs via OpenAPI/Swagger UI, removing friction when onboarding new collaborators.

SCM system for bookstores

Jan 2024 – Jun 2024

Management system for bookstores and stationery shops with Angular and a .NET backend, with RESTful APIs, lazy loading, and modularization that streamlined processes by 25%.

• Inventory and sales modules over a real client domain, with deferred loading and a modular architecture.
• Intuitive, responsive interfaces that improved UX and visual consistency.
• Role-based admin panel (products, categories, suppliers, users) on top of a layered .NET Core 8 API with Swagger docs and EF Core over SQL Server.