Systems Analyst &
Developer.
I architect and build transactional systems focused on reliability, strict audit trails, and complex business logic. Experienced in high-concurrency real-time auction platforms, auditable enterprise backoffices, n8n/AI pipelines, and decentralized smart contracts (Web3 / Solidity).
Production Systems & Case Studies
Real-world production software architected to eliminate operational friction and handle mission-critical data.
Gold State Bienes Raíces
Real estate portfolio management system. Lease lifecycle state machines, automated late-fee calculation engines, tenant ledgers, and consolidated stakeholder statements.
Aurelius Group Bienes Raíces
Corporate operations backoffice for internal traceability, commercial customer management, role-based access control (RBAC), and immutable audit logs.
Live Bidding & Auction Platform
Sub-millisecond reactive auction engine. Synchronized catalog state across concurrent users, atomic escrow verifications, and instant automated settlement.
Financial Operations Engine
Loan origination and amortization schedule computations, double-entry ledger bookkeeping, mobile collector audit trails, and zero-variance daily cash drawer reconciliations.
Auto Repair Shop Operations
Work order management by shop station, task allocation per mechanic, atomic spare parts warehouse deduction, and vehicle maintenance history indexed by license plate.
RL Construcciones
Construction milestone certifications, staging vs. job-site material dispatch, labor management, and real-time computation of budget vs. actual cost variances.
Stack Architecture & Tooling
Specialized in battle-tested technologies selected for throughput, data integrity, and low maintenance overhead.
01 // Backend & APIs
- Python (Django, REST Framework)
- Node.js (Express, TypeScript)
- RESTful API Design & Versioning
- Background Workers & Webhooks
- JWT & RBAC Authorization
02 // Databases
- PostgreSQL (Relational Schema Design)
- MySQL (Index Optimization)
- Normalization & ACID Transactions
- Stored Procedures & Migrations
- Event Logs & State Tracking
03 // Frontend & Client
- React & TypeScript
- Tailwind CSS & Clean UI/UX
- State Management (Zustand/Context)
- WebSockets (Client Sync)
- Flutter (Cross-platform apps)
04 // AI, Web3 & DevOps
- n8n (Workflow Orchestration)
- Claude AI API (Context Agents)
- Solidity & Remix IDE (Smart Contracts)
- Docker & Containerization
- Git / GitHub (CI/CD Pipelines)
Software Development Life Cycle (SDLC)
A structured engineering standard ensuring clean, auditable, and business-aligned deliverables:
Scoping & Discovery
Mapping real-world operational workflows, identifying manual bottlenecks, and documenting exact functional system requirements.
Relational Data Modeling
Formal entity-relationship modeling (ERD), integrity constraints, RBAC permissions, and strict API contract specifications.
Development & Testing
Modular strictly-typed code implementation (Django, TypeScript, React), integration tests, and edge-case transaction validation.
Deployment & Observability
Docker containerization, hardened environment configurations, database migrations, and live production telemetry.
Blas Arjona
Systems Analyst specialized in building maintainable, high-throughput software. My core value lies in bridging complex operational business workflows with dependable technical architectures that scale without technical debt.
