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Emmanuel Elendu

@emmanuelelendu

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I build high-scale payment, ledger, and reconciliation systems with reliable transaction processing.

Nigeria

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What I'm looking for

I'm looking to build reliable, high-scale payment, ledger, reconciliation, and financial systems where I can solve complex transaction-processing problems.

At Klak Technologies, I build ATM and POS reconciliation engines that automate matching high-volume card and terminal transactions against switch, processor, and bank settlement records. I also own SaaS server architecture as the platform separates hosted and on-premises deployments.

I previously built a double-entry ledger system at Squareme, with consistent, atomic, idempotent posting and reconciliation workflows. I helped migrate a monolith to microservices, improving reliability by 40%, and improved application performance by 23%.

At Baxi by Onafriq, I built backend systems for POS, card-payment, and mobile-wallet transactions across Nigeria. My work covered settlements, reversals, failures, discrepancy resolution, NIP transfers, and event-driven services using Redis and Kafka.

Across Node.js, Java, and Python, I design fault-tolerant financial systems with strong guarantees for idempotency, consistency, auditability, and data integrity. I enjoy turning real-world reconciliation and transaction problems into scalable systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Klak Technologies

Mar 2025 - Present (1 year 6 months)

Architected and built ATM and POS reconciliation engines, automating end-to-end matching of high-volume transactions. Led backend structural separation into hosted SaaS and on-premises deployment modes.

NodeJS Java Python Distributed Systems Event Driven Architecture Reconciliations Transaction Processing Idempotency Audit Trails SaaS architecture

Senior Fullstack Engineer

Squareme

Aug 2024 - Feb 2025 (6 months)

Architected and implemented a ledger system using double-entry accounting principles. Migrated from a monolithic system to microservices, improving reliability by 40%.

Backend Engineer

Baxi by Onafriq

Nov 2022 - Jul 2024 (1 year 8 months)

Built backend systems powering POS, card payments, and mobile wallet transactions. Designed high-volume transaction pipelines with idempotency and consistency guarantees.