Architecting
the backbone of
Digital Ecosystems.
Tech Lead & Senior Software Engineer specialized in high-performance microservices, Fintech SDKs (M-Pesa/e-Mola), AI integration, and enterprise-grade Web & Mobile platforms.
The Technical Arsenal.
No single point of failure. Deep proficiency across the entire software development lifecycle.
Backend & Distributed
- ▹ Node.js (NestJS, Express)
- ▹ Elixir & Golang
- ▹ Python (Django, Flask, FastAPI)
- ▹ PostgreSQL, MongoDB, Redis
- ▹ Message Brokers (Kafka, RabbitMQ)
- ▹ gRPC & WebRTC Protocols
Frontend & Mobile
- ▹ React.js & Next.js
- ▹ React Native
- ▹ Flutter
- ▹ Android Nativo (Kotlin/Java)
- ▹ TailwindCSS & Framer Motion
- ▹ Offline-First Solutions
AI & Machine Learning
- ▹ Custom LLM integration (GPT-4)
- ▹ RAG (Document Search)
- ▹ Facial Recognition (KNN)
- ▹ Whisper API (Voice-to-Text)
- ▹ Native Biometric integrators
- ▹ Stable Diffusion & DALL-E
Cloud Architecture & DevOps
- ▹ Kubernetes & Docker
- ▹ AWS, GCP & DigitalOcean
- ▹ CI/CD (GitLab, GitHub Actions)
- ▹ IPsec VPN Tunnels (From Scratch)
- ▹ OpenTelemetry & Monitoring
- ▹ Real-Time FinTech SDKs
Career Milestones.
Tracing the pathway of high-stakes technical leadership and enterprise delivery.
Tech Lead & Full Stack Engineer @ VOID
Mar 2023 - Present (~2 Years as Lead)
Technical leadership over 3 core engineering teams building high-stakes platforms: Sonil (Tabacos de Malema), Fidli, and JFS. Driving massive digital transformation and engineering complex multi-platform mobile ecosystems.
Full Stack & Mobile Engineer @ Globalsys
Jul 2021 - Feb 2023
Acted on a massive microservices ecosystem (+100 repositories) architecting solutions for Reserva and Widu.
- Refactored legacy SQL Server systems into modern NestJS / Kafka backends.
- Engineered comprehensive SMTP integration engines to automatically parse incoming emails and inject attachments directly into core SQL databases.
- Implemented multithread parallel processing via Web Workers for heavy reporting.
- Constructed intelligent post-sales algorithms using AI clustering for automated omnichannel contacts.
Mobile App Developer @ Tempo | Negócios
Mar 2021 - Jun 2021
Developed front-end architectures for highly dynamic mobile applications, delivering optimized user experiences through native and cross-platform ecosystems.
Tech Lead & Full Stack @ Miro Software
Jun 2020 - Aug 2020
Led the end-to-end engineering of PassBem, a driving school ecosystem encompassing Mobile App, Core Backend, and Web Dashboards.
- Scaled the platform to seamlessly support over +6,000 active users.
- Engineered a class management system that drove a direct 50% reduction in administrative times.
Full Stack & Engine Programmer @ VetBox
Feb 2020 - Feb 2021
Focused on heavyweight E-commerce automations and strategic reporting algorithms for agriculture.
- Engineered automated workflows that boosted core billing processes upwards of +19,000.
- Created the AMIA Panel: A strategic poultry management portal for massive conglomerates like Higest and Merec.
- Developed sector-wide calculation engines to extract metrics consumed directly by the Ministry of Agriculture.
Enterprise Architect & AI Consultant @ Sislog & Freelance
Jan 2015 - Present
Leading high-impact autonomous architectural deployments for market-shaking clients such as Sislog (MultiChoice), CBS University, ISCET, and massive private groups.
- Sislog (Telco Middleware): Engineered the core NestJS gateway connecting major telecoms (Vodacom, Movitel, TmCel) directly to the MultiChoice USSD API. Designed a robust hybrid PostgreSQL/Redis session persistence layer, guaranteeing sub-millisecond latencies and sustained 99.9% uptime.
- CBS University (SGU): Integrated Whisper API and GPT-4 for multilingual AI transcriptions and architected a custom P2P WebRTC/WebAssembly video conference platform handling +100 concurrent users.
- ISCET / EDA (EdTech & Biometrics): Architected facial recognition modules for secure automated exam proctoring and developed comprehensive financial portals for tuition management.
- G-Group / Guyzelh Ramos (Lirandzu): Tech lead for an AI-driven social matching platform. Built complex matchmaking algorithms (Python/NumPy) and low-latency P2P WebRTC live streaming ecosystems.
Ecosystem Footprints.
Products engineered for scale, financial transactions, and operational resilience.
sdkPymet & EasyMozPay
Engineered robust Payment SDKs (M-Pesa and e-Mola) in Node.js handling high-volume C2B, B2C, B2B transactions. Evolved the core module into a comprehensive Stripe-inspired SaaS featuring a scalable NestJS backend and highly modern Next.js dashboard.
Munthi Platform
End-to-end structuring of a highly complex real estate ecosystem. Designed across three fronts: Node.js/MongoDB Backend, React Native Mobile App, and Vite Web Dash. Added an intelligent booking engine and M-Pesa Premium subscription layers natively.
Paulina SMS Gateway
Transform any regular Android smartphone into a distributed P2P SMS Server. Coordinated by a NestJS centralized control server via gRPC and WebSockets, firing webhooks in real-time. Eliminates international routing costs radically.
Trusted by the best.
"The fluidity with which Délcio navigates the JavaScript ecosystem is truly impressive. He fully leverages TypeScript's typing not only to avoid bugs in the interface but to build solid bridges to the backend."
"He delivers code natively designed to scale in the backend, deeply respecting containerization (Docker/Kubernetes). The fact that he masters both code and orchestration via CI/CD makes deployments remarkably smooth."
"Délcio is the dream partner for any Product Owner. He understands how to deliver value to the product and iterate rapidly on an MVP. He discusses technological trade-offs with extreme maturity."
"Where Délcio truly stands out is in his ability to orchestrate the logic behind the scenes. Whether dealing with heavy traffic or intensive databases, he manages to foresee latency failures right at the architectural phase."