Transforming communication infrastructure across Africa, one API call at a time.
I'm Collins Joe, a full-stack developer and tech entrepreneur from Ghana 🇬🇭, on a mission to democratize access to reliable communication services. As the founder of Sendexa, I'm building the infrastructure that will power the next generation of African startups and enterprises.
mindmap
root((Collins Joe))
Sendexa Founder
Communication APIs
SMS Gateway
OTP Services
SMPP Integration
Developer
Full-Stack
Backend Architecture
API Design
System Scalability
Innovator
UNICEF StartUp Lab
Tech Ecosystem
Community Building
Sendexa is a comprehensive communication platform providing enterprise-grade APIs for SMS, OTP, and messaging services. We're building the infrastructure that African businesses need to connect with their customers reliably and affordably.
|
|
graph LR
A[Client Application] -->|REST API| B[API Gateway]
B --> C[Authentication Layer]
C --> D[Message Queue]
D --> E[SMPP Connector]
E --> F[Mobile Network Operators]
D --> G[Database]
G --> H[Analytics Engine]
H --> I[Dashboard]
style A fill:#3B82F6
style B fill:#8B5CF6
style E fill:#10B981
style F fill:#F59E0B
Backend Infrastructure
Database & Caching
Frontend Dashboard
DevOps & Infrastructure
Development Tools
gantt
title Sendexa Development Timeline 2024-2025
dateFormat YYYY-MM-DD
section Core APIs
SMS Gateway V1 :done, api1, 2024-01-01, 90d
OTP Service :done, api2, 2024-03-01, 60d
2-Way Messaging :active, api3, 2024-11-01, 120d
Voice API :api4, 2025-03-01, 90d
section Platform
Developer Dashboard :done, dash1, 2024-02-01, 120d
Analytics Engine :active, dash2, 2024-10-01, 90d
Webhook System :dash3, 2025-01-01, 60d
section Infrastructure
SMPP Integration :done, infra1, 2024-01-15, 180d
Load Balancing :active, infra2, 2024-12-01, 60d
Multi-region Deployment :infra3, 2025-02-01, 90d
Node.js Expert |
TypeScript Expert |
Next.js Expert |
React Advanced |
MongoDB Advanced |
PostgreSQL Advanced |
Docker Intermediate |
Redis Intermediate |
🔌 API Development & Integration
- RESTful API design and implementation
- GraphQL schema design and resolvers
- WebSocket real-time communication
- SMPP protocol implementation
- Third-party API integrations (Stripe, Paystack, Twilio)
- API rate limiting and throttling
- OpenAPI/Swagger documentation
- API versioning strategies
🏗 System Architecture & Design
- Microservices architecture
- Event-driven architecture
- Message queue systems (RabbitMQ, Redis Pub/Sub)
- Database design and optimization
- Caching strategies (Redis, CDN)
- Load balancing and horizontal scaling
- Serverless architecture (Vercel, AWS Lambda)
- System monitoring and observability
🔒 Security & Authentication
- JWT and session-based authentication
- OAuth 2.0 and OpenID Connect
- API key management
- End-to-end encryption
- SQL injection prevention
- XSS and CSRF protection
- Security headers and HTTPS enforcement
- Rate limiting and DDoS protection
📊 Data & Analytics
- Real-time analytics dashboards
- Data aggregation and reporting
- Time-series data handling
- Data visualization (Chart.js, Recharts)
- ETL pipelines
- Database query optimization
- Data backup and recovery strategies
| 🎯 Achievement | 📅 Date | 🌟 Impact |
|---|---|---|
| UNICEF StartUp Lab Cohort 5 Selection | 2024 | Selected among top startups for incubation and mentorship |
| Sendexa Platform Launch | Jan 2024 | Successfully launched MVP with core SMS API |
| First 1,000 API Calls | Feb 2024 | Achieved first milestone in API usage |
| SMPP Direct Integration | Jul 2024 | Direct carrier integration for improved delivery rates |
| 10+ Enterprise Clients | Oct 2024 | Onboarded major businesses across Ghana |
| 99.9% Uptime Achievement | Nov 2024 | Maintained enterprise-grade reliability for 6 months |
graph TD
A[Current Focus] --> B[Microservices Architecture]
A --> C[SMPP Protocol Mastery]
A --> D[Advanced API Security]
A --> E[System Scalability]
B --> F[Service Mesh]
B --> G[Container Orchestration]
C --> H[Carrier Integration]
C --> I[Protocol Optimization]
D --> J[Zero Trust Architecture]
D --> K[Threat Modeling]
E --> L[Horizontal Scaling]
E --> M[Database Sharding]
style A fill:#3B82F6
style B fill:#10B981
style C fill:#10B981
style D fill:#10B981
style E fill:#10B981
- 🔄 Microservices Patterns - Building distributed systems at scale
- 📡 SMPP Protocol - Deep dive into telecommunications protocols
- 🔐 Advanced Security - OAuth 2.1, JWT best practices, API security
- 🚀 Performance Optimization - Database indexing, caching strategies
- ☸️ Kubernetes - Container orchestration for production workloads
- 📊 Observability - Metrics, logging, and distributed tracing
🚀 Founder & Lead Developer - Sendexa (2023 - Present)
Leading the development of Ghana's next-generation communication platform
- 🏗 Architected and built entire platform from ground up using Node.js, TypeScript, and Next.js
- 📡 Implemented SMPP integration with major telecom carriers for direct SMS routing
- 🔒 Designed secure authentication system handling 10,000+ API requests daily
- 📊 Built real-time analytics dashboard processing millions of events per month
- 👥 Onboarded and retained 10+ enterprise clients with 99.9% satisfaction rate
- 💰 Achieved profitability within first year of operation
- 🎯 Selected for UNICEF StartUp Lab Cohort 5 - top startup accelerator program
Key Technical Achievements:
- Reduced API response time from 800ms to <100ms through optimization
- Implemented auto-scaling infrastructure handling 10x traffic spikes
- Built message queuing system processing 1M+ messages daily
- Achieved 99.9% uptime over 12 consecutive months
💻 Full-Stack Developer - Freelance (2021 - Present)
Building custom solutions for startups and businesses
- Developed 15+ production applications for clients across Ghana and internationally
- Specialized in Next.js dashboards, API development, and database architecture
- Implemented payment integrations with Stripe, Paystack, and Flutterwave
- Mentored junior developers on modern web development practices
Notable Projects:
- E-commerce platform handling $50K+ monthly transactions
- Real estate management system with 500+ property listings
- Educational platform serving 1,000+ students
- Restaurant POS system with inventory management
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"name": "Collins Joe",
"location": "Ho, Volta Region, Ghana",
"timezone": "UTC+0",
"status": "Available for collaboration"
},
"geometry": {
"type": "Point",
"coordinates": [0.4667, 6.6]
}
}
]
}
📍 Based in: Ho, Volta Region, Ghana 🇬🇭
🕐 Timezone: UTC+0 (GMT)
💼 Status: Open to collaboration on impactful projects
🗣 Languages: English (Fluent), Ewe (Native), Twi (Conversational)
|
Building innovative solutions for African markets |
Contributing to impactful open-source projects |
API architecture, scalability, and system design |
Response Time: Usually within 24 hours ⚡
| 💭 | Fact |
|---|---|
| 🎯 | On a mission to make Sendexa the leading communication platform in Ghana by 2026 |
| 📚 | Self-taught developer - learned everything from documentation and building projects |
| ☕ | Coffee enthusiast - best code written between 10 PM and 2 AM |
| 🎮 | Enjoy strategy games - they teach system thinking and optimization |
| 🌱 | Passionate about mentoring young developers in Ghana |
| 🎥 | Planning to launch a YouTube channel on startup building and development |
| 🏃 | Believer in sustainable growth over rapid, unsustainable scaling |
| 🌍 | Dream: Build technology that positively impacts 1 million Africans |
TypeScript 12 hrs 30 mins ███████████░░░░░░ 55.2%
JavaScript 4 hrs 15 mins ████░░░░░░░░░░░░░ 18.8%
React/Next 3 hrs 45 mins ███░░░░░░░░░░░░░░ 16.6%
JSON 1 hr 20 mins █░░░░░░░░░░░░░░░░ 5.9%
Other 45 mins ░░░░░░░░░░░░░░░░░ 3.5%
- Scale Sendexa to 100+ enterprise clients
- Launch Voice API for Sendexa
- Expand to 5 African countries
- Open source key Sendexa libraries
- Speak at 3 tech conferences
- Launch developer community platform
- Mentor 20 aspiring developers
- Contribute to 5 major open-source projects
