Full Stack Software Engineer

Hi, I'm Khalil

I've spent the last 5 years building systems for multinational teams — distributed architectures, messy data, and the occasional 3am incident.

Lately I've been deep into distributed systems, AI applications and the parts of computer science I skipped in college. Based in southern Brazil. Don't think too hard about my last name.

Work Experience

Mayani

Mar 2025 - Present

Software Engineer

Built custom AI agents for 24/7 WhatsApp support (OpenAI API + Redis): saved ~$4,000/client in operational costs, reduced response time by 99% (hours → seconds).
Grew MRR by ~$1,000/client with a Split Payment system via Mercado Pago API for online reservation payments.
Reduced development cost per page by 44% by building a proprietary Design System with 53 components (Radix UI, Tailwind CSS, CVA).
Reduced latency of 10+ endpoints by 95% (~1.6s → 80ms) using async queues with Redis/BullMQ.
Cut analytical query execution time by 74% in PostgreSQL via composite and partial indexes.
Improved tournament management time by 72% (10h → 3h) with a dedicated module, generating ~$1,000/tournament in new revenue.
Improved TTFB by 90% (800ms → 80ms) and LCP by 65% using aggressive 5-layer caching in Next.js.

IXC

Jan 2021 - Mar 2025

Software Engineer

Built and maintained a messaging pipeline that processed 3B+ messages annually, scaling horizontally with MongoDB, Kafka and an API Gateway (AWS) fronting the platform.
Preserved $144,000 in ARR and reduced support tickets by 14% by fixing 150+ critical bugs and achieving 100% back-end test coverage via pair programming.
Saved 50% in monthly cloud database costs by optimizing MongoDB Atlas (historical archiving + 3GB index optimization).
Accelerated feature delivery by 43% (3 → ~1.7 days) by leading front-end migration to Next.js and establishing Clean Architecture standards.
Eliminated 31% of production errors and sped up automated test feedback cycle by 68% via CI/CD pipelines and Jest → Vitest migration.