Abdwahab Adekola

Senior Backend Engineer

Remote, US.

About

Highly accomplished Senior Backend Engineer with over 5 years of expertise in architecting and deploying secure, scalable, and fault-tolerant backend systems using Node.js and TypeScript. Proven leader in developing event-driven architectures and microservices, consistently reducing operational costs, enhancing system uptime, and integrating advanced technologies like AI and third-party APIs. Drives significant business impact through innovative solutions in fintech, property management, and marketplace platforms, serving over 15,000 active users.

Work

Eleven36

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Backend Engineer

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Summary

Architected and led the development of secure, scalable backend systems for a financial platform, enabling seamless crypto-fiat conversions, payment flows, and robust fraud prevention.

Highlights

Architected and led the development of secure, scalable backend systems for a financial platform, enabling seamless crypto-fiat conversions and robust fraud prevention, processing critical wallet transactions and idempotent payment flows.

Designed and implemented RBAC-based authorization and KYC verification workflows, ensuring 100% regulatory compliance and secure access across diverse financial operations.

Reduced critical security vulnerabilities to zero across multiple services by implementing advanced OWASP-based validation, rate limiting, and authentication hardening protocols.

Built and maintained high-performance backend APIs for a landlord-centric property management platform, streamlining lease lifecycle management, rent collection automation, and tenant-landlord communication.

Developed and deployed an AI-powered lead classification system, significantly improving customer segmentation, lead quality scoring, and conversion rates through data-driven decisioning.

Integrated and managed multiple critical third-party services, including payment gateways, blockchain services, and messaging APIs, enhancing overall system reliability and fault tolerance.

Contributed to system architecture decisions, service boundaries, and infrastructure design, with hands-on involvement in CI/CD automation to enable fast, reliable deployments.

Arbind Consult

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Freelance Backend Engineer (Team Lead)

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Summary

Led a cross-functional team to build and deploy the Verimerce platform, including web and mobile backends, and managed cloud infrastructure on AWS/DigitalOcean.

Highlights

Built and deployed the Verimerce platform, encompassing both web and mobile backends, ensuring robust and scalable functionality.

Designed and implemented a WhatsApp-based campaign system with advanced distributed session handling, facilitating efficient communication strategies.

Led a small cross-functional team, coordinating frontend and mobile development efforts to achieve cohesive project delivery.

Managed comprehensive cloud deployments on AWS and DigitalOcean, including successful listing of applications on Play Store and App Store.

Cribstock

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Backend Engineer

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Summary

Owned and delivered multiple core backend products and features for a fintech and property marketplace platform, serving over 15,000 active users.

Highlights

Owned and delivered multiple core backend products and features, supporting a fintech and property marketplace platform used by 15,000+ active users.

Eliminated wallet balance fraud and race conditions by introducing a queue-based, concurrency-safe transaction system, reducing financial inconsistencies by ~95%.

Increased order fulfillment and transaction throughput by ~30% through algorithm redesign and optimized execution paths.

Refactored the property stock marketplace to support fractional (unit-based) trading, significantly expanding market participation and liquidity.

Increased wallet deposits by ~35% through the implementation of a compliant auto-debit feature with secure card-handling flows.

Designed and implemented an in-house accounting system to accurately track monthly costs, turnover, and distribute proceeds value per unit to shareholders.

Built a monthly dividend payout service that automatically calculated and credited user wallets, processing payouts reliably at scale.

Reduced failed payments by ~75% by deploying a dedicated, fault-tolerant payment service with improved retry and reconciliation logic.

Dillali

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Backend Developer

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Summary

Developed and maintained backend services for large-scale data entry and retrieval operations, enhancing data integrity and system stability.

Highlights

Developed and optimized backend services supporting large-scale data entry and retrieval operations, ensuring efficient data processing and access.

Designed and implemented robust onboarding workflows for data entry officers, incorporating authentication and role-based access control to enhance security and operational efficiency.

Implemented automated database backup and recovery solutions, significantly improving data integrity and minimizing downtime risk.

Supported system stability during peak operational periods through proactive monitoring and rapid issue resolution, maintaining continuous service availability.

National Library Data

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Backend Developer

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Summary

Developed backend services and onboarding workflows for large-scale data management, ensuring data integrity and system stability.

Highlights

Developed and optimized backend services supporting large-scale data entry and retrieval operations, ensuring efficient data processing and access.

Designed and implemented robust onboarding workflows for data entry officers, incorporating authentication and role-based access control to enhance security and operational efficiency.

Implemented automated database backup and recovery solutions, significantly improving data integrity and minimizing downtime risk.

Supported system stability during peak operational periods through proactive monitoring and rapid issue resolution, maintaining continuous service availability.

Education

Obafemi Awolowo University

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B.Sc. Electronic & Electrical Engineering

Languages

English

Skills

Cloud & Deployment

Vercel, AWS, Heroku, Digital Ocean.

Languages & Frameworks

Nestjs, TypeScript, JavaScript, Node.js, Express.js.

Database & Caching

Postgres, MongoDB, MySql, Redis.

Containerization / Brokers

Docker, RabbitMQ, Kafka.

ORMS & Tools

Sequelize, Prisma, GraphQL, Jest, Swagger, Figma, Zod, Joi, TypeOrm, Mongoose.

Testing

Jest, Chai, Mocha.