SDL

The Shepherd Digital Lab

I'm David Abejirin, a FinTech systems architect specializing in payment systems, fintech solutions, and scalable architecture that drives business growth.

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Visit davidabejirin.com for my full professional profile and experience

Software Engineering Expertise

I deliver robust, scalable solutions for fintech and payment systems through proven engineering practices and deep technical expertise.

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Payment Systems

Enterprise-grade payment gateway implementations with multi-provider integration, fraud detection, and regulatory compliance.

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System Architecture

Microservices architecture design, API development, and scalable backend systems that handle millions of transactions.

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Security & Compliance

PCI DSS compliance, data encryption, secure authentication, and financial industry regulatory requirements.

Why Choose The Shepherd Digital Lab?

🎯 Specialized Expertise

I focus deeply on backend engineering for fintech and payment systems, with hands-on experience in enterprise-scale implementations.

⚡ Proven Results

I have a track record of delivering high-performance systems that process millions of transactions with 99.9% uptime and sub-second response times.

🤝 Independent Consulting

I provide dedicated focus on your project with flexible engagement models and direct access to senior-level engineering expertise.

Technology Stack

Java Spring Boot PostgreSQL Redis Docker Kubernetes AWS Microservices REST APIs GraphQL

Modern, battle-tested technologies chosen for reliability, scalability, and maintainability in production environments.

Case Studies

Explore detailed case studies showcasing real-world backend engineering implementations, technical challenges solved, and the impact delivered for clients.

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Featured Project 6-month project

Enterprise Payment Gateway Implementation

Complete payment processing solution with multi-provider integration, fraud detection, and real-time transaction monitoring. Built to handle 10,000+ transactions per minute with 99.9% uptime.

                                        Performance
                                        10K+ TPS
                                    

                                        Uptime
                                        99.9%
                                    

                                        Response Time
                                        <200ms
                                    

Java Spring Boot PostgreSQL Redis Docker Kubernetes

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Banking Platform 4 months

Core Banking System Modernization

Legacy system migration to microservices architecture with real-time transaction processing and enhanced security protocols for a regional bank.

Java Spring Cloud Apache Kafka MongoDB

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Fintech API 3 months

Mobile Banking API Platform

RESTful API platform supporting mobile banking applications with OAuth2 security, rate limiting, and comprehensive monitoring.

Node.js Express PostgreSQL Redis

I'm preparing more detailed case studies. Each project represents independent consulting work I've completed through The Shepherd Digital Lab.

Discuss Your Project

Ready to Build Something Great?

Let's discuss your backend engineering needs and how I can help you build scalable, secure, and high-performance systems.

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