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dark-array/README.md
Efrain Araya Fuentes β€” Tech Lead

EA

Portfolio LinkedIn Email WhatsApp

C#, .NET, Azure, Docker, Git, Kotlin, Android, Java, PostgreSQL, Oracle, SQL Server


About

Mid / Semi-Sr Tech Lead with 4+ years shipping enterprise systems.
I work where code meets business: architecture, estimation, CI/CD, and hands-on delivery.

Clean architecture. Honest estimates. Software that holds up in production β€” not just in demos.

4+ years Β· 10+ systems Β· 3 industries Β· 50% faster key reports


How I work

Idea to go-live workflow

Delivery, Architecture, Cloud, Leadership


Stack

C# .NET ASP.NET Core EF Core Blazor REST Java Kotlin Android

SQL Server T-SQL PostgreSQL Oracle Data modeling

Azure Docker Azure DevOps CI/CD Git xUnit

Scrum Kanban Estimation Architecture Client delivery


Things I've shipped

Projects grouped by problem type β€” technologies first, outcomes second.

Platforms & APIs

Enterprise web platforms with clean architecture, REST APIs, and Blazor UIs.

C# ASP.NET Core EF Core Blazor SQL Server Azure

  • Multi-module business platforms delivered end-to-end
  • Domain models and APIs designed for real production load

Cloud & delivery

CI/CD and cloud packaging so releases are boring (in a good way).

Azure Azure DevOps Docker Container Apps Key Vault

  • Pipelines for build β†’ test β†’ deploy
  • Environment separation and secret hygiene

Data, BI & reporting

Dashboards and SQL reporting that cut time-to-decision.

SQL Server T-SQL Oracle PostgreSQL SAP HANA KPIs

  • Expenses & purchasing analytics with dynamic filters
  • Operational reporting with ~50% less time on key reports
  • Models that handled +50% data volume without degrading

Operations workflows

Digital flows that replace paper and chase emails.

Workflows .NET SQL Approvals ERP integration

  • Warehouse release requests: create β†’ approve β†’ dispatch
  • Fuel control + asset maintenance with usage-based work orders
  • Payroll processing with time-clock import and ERP payments

Mobile on the floor

Android tools for warehouse and production-line reality.

Kotlin Java Android SQL Server Oracle

  • Warehouse inventory with barcode-oriented capture
  • Production quality control (team setup, defect types, counters)
  • ~60% fewer data-entry errors on quality capture

Snapshot

  Platforms β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–‘β–‘β–‘β–‘  .NET / Blazor / APIs
  Data      β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–‘β–‘  SQL Server Β· Oracle Β· PG
  Cloud     β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–‘β–‘β–‘β–‘β–‘  Azure Β· CI/CD Β· Docker
  Mobile    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–‘β–‘β–‘β–‘β–‘β–‘β–‘β–‘  Kotlin / Android
  Workflows β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–‘β–‘β–‘β–‘  Ops Β· Payroll Β· Fuel

Let's build something solid

Have a system to improve, a process to automate, or a product to ship?

Portfolio Email LinkedIn

Costa Rica Β· Open to impactful engineering & tech leadership conversations

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