About Skills Projects Experience Contact
Lagos, Nigeria

David Amaku

> 
5+ Years Experience
11,000+ Users Served
$100K+ Monthly Volume
10+ Engineers Led
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David Amaku
5+ Years building
About Me

I architect scalable systems that power real financial infrastructure.

Senior Backend & Blockchain Engineer with 5+ years shipping production fintech and Web3 systems. I've led monolith-to-microservices migrations, built cryptocurrency exchanges processing $100K+ monthly, designed multi-chain non-custodial wallets, and delivered enterprise payment pipelines — all while growing engineering teams from junior contributors to mid-level engineers who own production systems. My work lives at the intersection of distributed systems, financial infrastructure, and blockchain technology.

Decentralized Finance (DeFi) Payment Systems & Fintech System Architecture & Scalability Engineering Leadership Developer Tooling & Automation
Technical Skills

The Stack I Ship With

⚡
Backend & API
JavaScriptTypeScriptPython GolangNode.jsExpress.js NestJSREST APIsWebSockets GraphQL
⛓️
Blockchain & Web3
EthereumSolanaTron BitcoinSoliditySmart Contracts DAppsNon-custodial Wallets Ethers.jsWeb3.jsTronWeb
🗄️
Databases & Caching
MongoDBRedisNoSQL Modeling Database IndexingAggregations Job QueuesCaching Strategies
☁️
DevOps & Cloud
AWS EC2AWS S3CloudWatch IAMElastiCacheSecrets Manager DockerGitHub Actions KubernetesTerraform
🏗️
Architecture
MicroservicesEvent-Driven SOASystem DesignUML Sequence DiagramsLoad Balancing Distributed Systems
🛡️
Testing & Security
JestUnit TestingIntegration Testing E2E TestingTDD VAPTSecurity AuditsVulnerability Assessment
Featured Work

Systems I've Built & Shipped

Zap Cryptocurrency Exchange Platform
Multi-chain crypto exchange with non-custodial wallet · 2023–2025
11,000+Active Users
$100K+Monthly Volume
500+Daily Transactions
6Blockchains
99.9%Uptime

Architected a full-stack cryptocurrency exchange platform from 0 to 11,000+ active users in 18 months. Built non-custodial multi-chain wallets supporting Solana, Ethereum, BSC, Polygon, Arbitrum, Optimism, Tron, and Bitcoin. Developed a sophisticated rate engine with dynamic fees, margin calculations, and real-time multi-currency conversion. Led the monolith-to-microservices migration improving deployment frequency by 400%, reducing API response times by 70%, and establishing the engineering processes that scaled the team to 10+ engineers.

Node.jsTypeScriptMongoDB RedisAWSDocker Ethers.jsSolana Web3TronWeb GitHub ActionsAgenda
Aadun Realty — Real Estate Fractionalization
Blockchain-based tokenized real estate investment · 2025
200+API Endpoints
NestJSFramework
RBACAuth System

Blockchain-based real estate fractionalization platform enabling tokenized property investment. 200+ modular NestJS endpoints covering property management, transactions, and analytics. Advanced RBAC, JWT auth, audit logging, Stripe webhooks, and full AWS infrastructure.

NestJSTypeScriptMongoDB AWSStripeBlockchain JWTRedis
go-with-me
Production-ready Go boilerplate for backend services · 2026

Open-source production-ready Go boilerplate built on patterns extracted from a real Nigerian fintech system running in production. Batteries included — clone it, rename it, ship it. Embodies the 'Sketch, Document, Code, Review' methodology.

GoMicroservices Production-readyFintech Patterns Open Source
infra-hub-tf
Multi-environment Terraform infrastructure · 2026

Production-ready Infrastructure as Code for the maestrohwithit platform. Multi-environment support with security hardening, automated backups, and disaster recovery. Deep AWS architecture knowledge encoded as version-controlled infrastructure.

TerraformHCL AWSIaC DevOpsSecurity
Payment Processing & Terminal Management
Enterprise payment systems with multi-provider integration · 2025

POS terminal management system integrating Sterling Payment API at Getpayed Technology Solutions. Designed comprehensive payment workflows with Mermaid sequence diagrams. Unified API layer

PythonGolangNode.js StripeSterling APIMicroservices
Work History

Where I've Made Impact

Getpayed Technology Solutions
Sep 2025 — Present
Senior Software Engineer — Backend · Lagos, Nigeria
  • Developing POS terminal management systems integrating Sterling Payment API using Python, Golang, and Node.js
  • Designing payment workflow automation with comprehensive sequence diagrams and technical documentation
  • Building secure payment processing pipelines with multi-provider integration strategies
Bank With Zelia
Apr 2024 — Present
Senior Software Engineer — Backend · Lagos, Nigeria
  • Building fintech backend systems for digital banking with secure API integrations for financial services
  • Contributing to scalable microservices architecture for high-availability payment processing systems
Aadun Realty (Freelance)
Mar 2025 — Jul 2025
Senior Backend Engineer · Remote
  • Architected blockchain-based real estate fractionalization platform with tokenized property investment capabilities
  • Built Admin Dashboard backend with 200+ RESTful API endpoints, authentication, authorization, and audit logging
  • Integrated Stripe payments and AWS infrastructure (EC2, S3, Secrets Manager) using Node.js, TypeScript, NestJS
Zap Technologies Ltd
Mar 2023 — Feb 2025
Lagos, Nigeria · Promoted twice over 2 years
Lead Engineer Oct 2024 — Feb 2025
  • Led monolith-to-microservices migration — 300% scalability improvement, deployment time hours → minutes
  • Established 'Sketch, Document, Code, Review' methodology — 60% fewer bugs, 40% faster shipping
  • Managed 10+ engineers (backend, frontend, QA, DevOps) across critical infrastructure projects
  • CI/CD with GitHub Actions & Docker; Redis caching improving API response times by 70%
Lead Backend Engineer Jul 2023 — Oct 2024
  • Architected crypto exchange: $100K+ monthly volume, 11,000+ users, 500+ daily transactions
  • Designed multi-chain non-custodial wallet — Solana, EVM (Ethereum, BSC, Polygon, Arbitrum, Optimism), Tron, Bitcoin
  • Built rate engine with dynamic fees, margin calculations, multi-currency conversion algorithms
  • Mentored 5 junior developers to mid-level through structured growth paths and pair programming
Software Engineer — Backend Mar 2023 — Jul 2023
  • Node.js/TypeScript backend improving performance 40%; MongoDB optimisation — 50% query efficiency gain
  • Automated crypto deposit/payout systems across multiple blockchains with retry mechanisms
  • Integrated Stripe & Flutterwave; built AI chatbot using OpenAI and Pinecone
  • Jest testing suite achieving 85% coverage; VAPT collaboration resolving 20+ security vulnerabilities
Solarsoft Technologies
Aug 2021 — Nov 2022
Software Engineer — Blockchain · Lagos, Nigeria
  • Developed Solidity smart contracts for EVM, optimizing gas efficiency and reducing execution costs by 50%
  • Built DApps improving transactional efficiency 40%; gained deep expertise in TRON Virtual Machine (TVM) ecosystem
  • Integrated blockchain into existing systems reducing transaction costs 25%; implemented security best practices
Impact by the Numbers

What I've Delivered

Quod Tango Muto — What I touch, I change.

0
Users Scaled from Zero
$0
Monthly Transaction Volume
0
Deployment Frequency Improvement
0
API Response Time Reduction
0
Bug Reduction via Testing
0
Engineers Mentored to Mid-Level
0
Security Vulnerabilities Resolved
0
Code Coverage Achieved
Available for senior roles & consulting

Let's Build
Something Real

Open to senior backend engineering roles, blockchain consulting, and fintech infrastructure projects. I bring architecture thinking, production shipping experience, and engineering leadership to every engagement.

💼
LinkedIn linkedin.com/in/david-amaku
GitHub github.com/maestroh1git
📍
Location Lagos, Nigeria