Nii Darku

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NII DARKU KOBLAH AMPONSAH DODOO

Backend Engineer | Production Systems | Payments & Real-Time Infrastructure

Accra, Ghana  •  niidarkudodo@gmail.com  •  niidarku.com  •  github.com/niicode  •  linkedin.com/in/niicode

Summary

Backend engineer who ships and stabilizes production systems. 6+ years in fintech backend, real-time trading infrastructure, and POS with financial integrity. I design for ACID compliance, audit trails, and performance—Node.js, TypeScript, PostgreSQL, Redis. Built payment workflows, refund/reversal logic, and high-availability notification systems.

Technical Skills

Languages: JavaScript, TypeScript, Go, Python

Backend: Node.js, Express, REST APIs, GraphQL, WebSocket, event-driven systems

Frontend: React, Next.js

Databases: PostgreSQL, Redis, MySQL, MongoDB

Tools: Docker, Git, GitHub Actions, Linux, AWS, Google Cloud, Cloud Run

Professional Experience

Backend Engineer

Sep 2024 – Present

BusyParade • Accra, Ghana

  • • Architected and shipped BusyOs from scratch—POS handling inventory, payments, and multi-location operations for retail clients; supports 10k+ transactions/day
  • • Designed PostgreSQL schemas with ACID compliance and audit trails for financial transaction integrity
  • • Implemented end-to-end payment workflows: discounts, refunds, partial payments, reversals—with full audit logging for compliance
  • • Shipped role-based access control and audit logging for multi-tenant, compliance-ready operations
  • • Deployed and maintained backend services on Google Cloud Run with Docker-based CI/CD; focused on stability and observability in production
  • • Enabled consistent multi-location reporting and reduced reconciliation errors; single source of truth for inventory and sales

Backend Developer

Sep 2022 – Jan 2026

Skippa Trading LLC • Remote, USA

  • • Architected high-performance notification infrastructure for real-time trade alerts; delivered to 2,000+ users with sub-second latency (p99 under 500ms)
  • • Implemented Redis caching and event-driven design; reduced API response times by ~40% (p99 from ~800ms to ~200ms) for time-sensitive data
  • • Integrated multi-channel delivery (Discord, OneSignal, WebSocket); maintained high availability for trading operations
  • • Owned reliability and performance of notification pipeline serving 50k+ alerts/day with high availability

Frontend Developer

Jan 2021 – May 2022

BlueSPACE Financial Cloud • Accra, Ghana

  • • Built frontend dashboards for multi-tenant insurance platform and contributed to government procurement portal

Selected Projects

BusyOs POS System

Built to replace spreadsheets and legacy tools: retail needed one system for inventory, payments, and reporting across locations. Greenfield backend and APIs with strict financial integrity and auditability.

  • • Problem: fragmented inventory/payments/reporting across locations; solution: single POS with ACID guarantees and full audit trail for compliance
  • • Scale: multi-location, 10k+ transactions/day; schema and APIs designed for growth
  • • Production: Docker on Google Cloud Run with CI/CD; monitoring and stability focus
  • • Performance and reliability: ACID-compliant PostgreSQL, Redis for session/cache; built for uptime and safe money handling

Education

Software Engineering Program — MEST Africa

2020

BSc. Agricultural Engineering — KNUST

2015 – 2019