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ajayi olatunji

@ajayiolatunji

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Backend Engineer with over 5 years of experience in scalable systems.

Nigeria

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What I'm looking for

I am looking for a role that fosters innovation, collaboration, and growth opportunities.

I am a Backend Engineer with over 5 years of experience in designing and optimizing scalable, high-performance systems. My passion lies in building reliable distributed systems, improving API efficiency, and ensuring security in applications. I have a strong problem-solving mindset and have worked in fast-paced, highly regulated industries, which has honed my ability to tackle complex engineering challenges.

In my current role at Pepster Limited, I led the development of a high-throughput matching service that achieved 95% accuracy, utilizing real-time WebSocket communication and event-driven architecture. My experience includes designing horizontally scalable microservices on AWS, implementing distributed rate-limiting, and building a real-time presentation attack detection system that eliminated fake profiles. I am committed to delivering secure and efficient solutions that enhance user experience and system reliability.

Throughout my career, I have developed a fault-tolerant payment processing system and optimized cross-border payment routing, significantly reducing transaction failures. I have also contributed to open-source projects, enhancing packaging tools for scalable environments. I am eager to leverage my skills and experience to drive innovation and efficiency in my next role.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Pepster Limited

Oct 2022 - Present (2 years 8 months)

Led the development of a high-throughput matching service using real-time WebSocket communication and event-driven architecture. Designed horizontally scalable microservices with automated load balancing, reducing API latency by 40%. Implemented secure OTP delivery and a real-time presentation attack detection system.

AWS ECS Redis Security Microservices Event Driven Architecture Fault Tolerance Load Balancing Real Time Systems

Backend Developer

eTranzact Global

Sep 2022 - Dec 2023 (1 year 3 months)

Built a fault-tolerant payment processing system using gRPC for inter-service communication. Optimised cross-border payment routing, reducing failed transactions by 30%. Introduced distributed tracing to monitor latency bottlenecks.

gRPC Payment Processing Fault Tolerance Microservices Cloud Computing

Backend Developer

Ekolaundry

Mar 2021 - Sep 2022 (1 year 6 months)

Secured APIs with JWT-based RBAC and OAuth2. Developed a priority-based job queue to optimise dispatch logistics, cutting delivery times by 25%.

JWT OAUTH2 API Security Job Queue Redis Microservices Backend Development

Intern

Software Freedom Conservancy

Aug 2021 - Aug 2021 (0 months)

Supported Debian’s efforts in cloud-native packaging tools and decentralised software distribution models. Investigated fault-tolerant mechanisms in software delivery pipelines.

Cloud Native Fault Tolerance Open Source Research Software Development

Software Engineer

The CANs

Jan 2020 - Dec 2020 (11 months)

Built and deployed a real-time crisis-tracking system using Firebase and Geolocation APIs for humanitarian aid during COVID-19.

Firebase Real Time Systems Crisis Management Software Development Humanitarian Aid API Integration

Education

Degrees, certifications, and relevant coursework

University of Ibadan

Bachelor of Science, Food Technology

2011 - 2016

Completed a Bachelor of Science in Food Technology, gaining knowledge in food processing, preservation, and technology applications in the food industry.