Active system: ready

Resume

Backend Engineer focused on scalable systems, Linux infrastructure, APIs, databases, and developer tooling.

A concise overview of experience across backend engineering, Linux operations, SaaS platforms, databases, and software product development.

Juan Castro portrait

01. Professional experience

Experience

Software Engineer

CommandLink

November 2024 — Current

Software Engineering at CommandLink entails reviewing Pull Requests from team mates, managing FOSS 3rd party VM software in Azure, writing code in Python, React, Php(Laravel) to manage the customer security aspect of the product.

  • Manage multiple customer infrastructure for Security platform and reporting data. Creation of decoders and rules for all events.
  • Implement documented process and for upkeep of security software that manages customer syslog and application event details.
  • Build and plan Security Health Screening scores across a myriad of source details and variety of grading scales with calculations.
  • Assist with Database architecture decisions and migration management scenarios.
  • Contribute to full stack developmental efforts in an agile time/weight based strategy.
PythonReactLaravelAzureSecurity

Software Developer III

RSR GROUP

October 2023 — February 2024

As a Software Developer III, I spearheaded a data service migration to a new platform and created new business reports using Django/Python. Additionally, I optimized internal processes by developing enhanced functionality with JavaScript/React.

  • Streamlined development processes by developing and presenting a Git workflow productivity strategy to leadership, resulting in a 30% reduction in development time.
DjangoPythonReactData MigrationReporting

Senior Infrastructure Engineer

Mailgun

Previous

Worked on SaaS platform development, product improvements, and reliability-oriented backend and systems work in a high-scale environment.

  • SaaS product development
  • Platform improvements
  • Reliability work
SaaSReliabilityInfrastructureBackend

Systems Architect

Rackspace

Previous

Focused on Linux administration, cloud databases, and hosting infrastructure across customer-facing environments.

  • Linux administration
  • Cloud databases
  • Hosting infrastructure
LinuxCloudDatabasesOperations

Backend Developer / Data Operations

Travelocity

Previous

Worked across database analysis and data operations in product environments where reliability and query discipline mattered.

  • Database analysis
  • Data operations
SQLAnalysisOperations

Military Service

US Army

Foundation

Built operational discipline, technical foundation, and execution habits under pressure that still shape engineering work today.

  • Military service
  • Operational discipline
  • Technical foundation
OperationsDisciplineSystems Thinking

02. Technical stack

Skills

Languages

4 items
TypeScriptPythonGoSQL

Backend

4 items
Node.jsFastifyNext.jsPrisma

Databases

4 items
PostgresMySQLSQLiteClickHouse

Infrastructure

4 items
LinuxDockerNATSAWS

Developer Tooling

4 items
GitHub ActionsCI/CDObservabilityAutomation

03. Selected projects

Selected Projects

Active Development

Collectiv v2

Featured

Collaborative music platform supporting sessions, contributions, notifications, profiles, royalty workflows, and mixer experiences.

Next.jsTypeScriptPrismaPostgresNextAuthCloudflare R2Vercel
Active Development

Hayabusa

Featured

Local-first security detection platform processing Windows Event Logs through a streaming pipeline into ClickHouse-powered detections.

GoPowerShellVectorNATSClickHouseDocker

04. Career highlights

Career Highlights

12+

Years Building Software

20+

Production Applications

6

Published Packages

5

Major Platforms

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Juan Castro: principal systems thinker. Built to optimize. Driven by data integrity. Expert in building systems that do not break.

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05. Download resume

Prefer the PDF version?

Download the one-page resume for a traditional hiring workflow, or use this page for deeper project context and technical background.

Download the one-page resume for a traditional hiring workflow, or use this page for deeper project context and technical background.

Download Resume.pdf