Geraldo Arantes Saidina Júnior
Software Engineer
- Led engineering team of 4 at revenue-generating startup
- Designed bulk messaging system handling 5,000–10,000 users per campaign
- Built async background task system processing 5,000+ concurrent tasks
- Improved production latency and database queries by 15% through indexing and query optimization
- Onboarded 2,000+ active paying users on video processing platform
Experience
Thinqr
June 2025 - PresentVP of Engineering
Lead engineering team of 4. Define architecture, conduct code reviews, manage hiring, and scope sprints. Built internal full-stack tools for talent acquisition, centralizing previously fragmented talent tracking. Previously built marketplace platform (currently shelved).
MJ Ventures (Chicago, IL, USA)
January 2025 - PresentBackend Engineer (remote)
Built AI messaging agents integrated with Twilio. Designed bulk messaging workflow sending to 5,000–10,000 users in batches over two hours. Implemented retry logic and idempotency. Built async background task system handling 5,000+ concurrent tasks using asyncio. Improved latency and database queries by 15% through indexing and query optimization.
Evotech (Maputo, Mozambique)
October 2023 - December 2024Full Stack Engineer
Architected and built scalable REST APIs across multiple production projects using Golang (Gin) and Python (FastAPI). Designed PostgreSQL database schemas with proper indexing and relationships. Implemented OAuth and JWT authentication flows securing API endpoints. Delivered production-grade frontend interfaces with Next.js, TypeScript, and Tailwind CSS integrated with backend services. Used ORMs including Prisma and GORM for data modeling. Participated in SCRUM/Kanban planning, code reviews, and CI/CD deployments.
Projects
Cindie AI
ShippedAI messaging agents integrated with Twilio for enterprise clients, handling bulk campaigns to 5,000–10,000 users.
ShortsBot AI
ProductionVideo content generation platform with job queue-based processing, serving 2,000+ active paying users.
BeFriendly
ShippedSocial networking platform with REST API designed with separation of concerns, modular architecture, and structured error handling.
Sentraze
ProductionDependency analysis platform where users submit package.json files; system analyzes dependencies with AI for risk assessment and mitigation.
Government Projects Monitor MZ
Ready for launchPlatform monitoring government projects in Mozambique, providing transparent access to public records and spending data.
Thinqr
Remote engineering staffing and delivery program connecting vetted African engineers with global companies.
Thinqr is a co-founded remote engineering staffing and delivery program focused on helping companies hire high-performing engineers and build reliable production-ready systems. We connect vetted African engineers with US-based clients through structured operations with clear standards and accountability.
The company operates remote-first, placing engineers in both freelance and full-time roles. We emphasize production-ready systems and structured operations to ensure reliable delivery for global clients.
Company-level metrics.
My Role at Thinqr
VP of Engineering leading engineering team of 4. Combine hands-on coding with technical leadership across architecture definition, code reviews, hiring, and sprint scoping.
- ▸Define architecture and technical standards for engineering team
- ▸Conduct code reviews and maintain code quality across projects
- ▸Own hiring process for engineering roles
- ▸Define sprint scope and technical priorities
- ▸Built internal full-stack tools centralizing talent tracking and operations
- ▸Architected and built marketplace platform (currently shelved)