I'm Jude Ndubuisi, a Backend / Systems Engineer based in Lagos, Nigeria. I build production systems with Rust, TypeScript and Python. I'm currently building Sendryx (opens in a new tab), a cross-border payments platform, and spend a lot of time thinking about backend architecture, performance, and reliability.
This is where I write about things I'm learning, building, and trying to understand, from Rust and async systems to databases, networking, embedded systems, distributed systems, and whatever else catches my attention.
A composite index in the wrong column order, a full scan that runs every minute, and a leading-wildcard search that cannot use an index at all. How to find each one with EXPLAIN ANALYZE, and what to do about it.
Migrating the Sendryx payments backend from NestJS to Rust: 250 MB to 20 MB resident memory, the hosting cost that saved, transfers from roughly 850 ms to 300 ms, type safety at the money boundary, and compile-time checked SQL.
Notes on implementing TCP/IP fundamentals in Rust over a Linux TUN device: the three-way handshake as a state machine, connection tracking by four-tuple, raw packet parsing, checksums, and what writing it changed about how I write application code.
Live cross-border payments platform with wallets, stablecoin payments, automated NGN payouts and real-time fiat settlement. $15K+ processed across 30+ active users. The backend runs on Rust, Axum, Tokio and SQLx with PostgreSQL, following a migration from NestJS to Rust.
Rust · Axum · Tokio · SQLx · PostgreSQL · Solana · Ethereum
Lightweight Rust HTTP API built with Hyper, Tower and SQLx. Asynchronous HTTP handling, PostgreSQL integration, middleware, CRUD APIs and health and metrics endpoints. Written as a study in production-style async backend design rather than as a framework.
Rust · Hyper · Tower · SQLx · PostgreSQL
TCP/IP stack implementation from scratch in Rust over a TUN device. RFC 793, the three-way handshake, connection tracking, raw packet parsing and TCP state management. The clearest thing I have written for understanding what sits underneath every HTTP server I ship.
Rust · Linux TUN · pcap · RFC 793
I am open to backend and systems engineering work, technical collaborations, and conversations about building reliable infrastructure. If you are hiring, building a backend-heavy product, or just want to argue about async Rust and database performance, the fastest route is email. I read everything and reply to most of it.