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David Okolie

@davidokolie

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Senior Backend Engineer skilled in scalable systems and API design.

Nigeria

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What I'm looking for

I seek a dynamic role that leverages my extensive backend engineering experience, fosters innovation and collaboration, and provides opportunities for growth into leadership positions.

I am a Senior Backend Engineer with extensive experience in developing scalable systems, particularly in payment processing and API design. My journey has been marked by a commitment to building secure, high-performance services that enhance user experience and streamline workflows. At Mainstack, I revamped the payments infrastructure, implementing asynchronous processing that improved transaction speeds and significantly reduced incident rates.

Throughout my career, I have successfully integrated complex financial systems and developed dynamic solutions, including a multi-currency payments processing with embedded tax service. I have led cross-functional teams to enhance product delivery, where I conducted code reviews and managed integrated gateways to streamline payment processes. I take pride in standardizing product documentation and mentoring interns, fostering a culture of growth and excellence within my teams.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Mainstack

May 2024 - Present (1 year 1 month)

- Revamped payments infrastructure and implemented asynchronous processing to cut incidents by 40% and MTTR to 30mins.
- Implemented integrations to local & international payment providers to provide
multi-currency wallet and payment functionality.
- Optimised queries for sales/transaction dashboards, reducing load times from 30 s
to < 5s .
- Supervised engineering intern onboarding and growth.

Payment Processing Asynchronous API Integration Query Optimization PostgreSQL Redis Amazon SQS Documentation

Backend Engineer

GetEquity

Dec 2023 - Present (1 year 6 months)

Led cross-functional collaboration to enhance product delivery and conducted code reviews to ensure adherence to best practices. Managed integrated gateways, including Webhook management, Payment processing, and KYC verification, while developing key business logic for multi-currency wallet funding and investment management.

Cross Functional Collaboration Code Review Webhooks Payment Processing KYC PostgreSQL REST APIs System Integration

Associate Backend Engineer

Forus Labs

Jul 2023 - Present (1 year 11 months)

Built a full-fledged reconciliation and ledger system for a digital wallet solution. Optimized memory consumption on a File Management application by implementing Node.js streams.

Reconciliation Systems Ledger Systems Digital Wallet Management Node MongoDB PostgreSQL API Development System Design

Education

Degrees, certifications, and relevant coursework

FreeCodeCamp & Microsoft

Certification, C# Programming

2025 - 2025

Acquired foundational knowledge in C# programming through a collaborative program by FreeCodeCamp and Microsoft. Developed skills essential for building robust applications.

Udemy

Certificate, Database Engineering

2023 - 2023

Completed a course on the fundamentals of database engineering. Learned about database design, management, and querying techniques.

Udemy

Certificate, Backend Engineering

2023 - 2023

Undertook a course focused on the fundamentals of backend engineering. Gained insights into server-side development, APIs, and system architecture.

ALX_Africa

Certificate, Fullstack Software Engineering (Backend Specialization)

2022 - 2023

Activities and societies: Low-level programming (C): Algorithm, Data Structures, Linux and Unix system programming. Higher-level programming: Python, Javascript, Databases, Airbnb Clone. System engineering & DevOps: Bash, Scripting, Networking, Web stack, Security, on call, CI/CD, Web Stack Debugging. Specialization Backend: Typescript, Modern Javascript, Python, Storage, Pagination, Caching, i18n, Queuing system, User data, Portfolio Project.

Completed a comprehensive program in Fullstack Software Engineering with a specialization in Backend development. Gained expertise in low-level programming (C), higher-level programming (Python, Javascript), databases, and system engineering & DevOps. Developed skills in technical writing, networking, and portfolio project creation.

British Computer Society

Level 4 Certificate, IT

2020 - 2021

Completed a Level 4 Certificate in IT, focusing on Information Systems, Computer Network Technology, and Software Development. Gained foundational knowledge and practical skills in various aspects of information technology.