ManuchimOliver.

Software people depend on, and the systems that keep it working.

7+ years building products, backends and cloud infrastructure: software that stays correct under load and recovers when things fail.

The longer story →

A composite of payment systems I've built. Click a box to explore.

years shipping production software: 7+
requests served at 99.9% uptime: 2M+
in weekly payments processed: $5M+
transactions a month on one backend: 10M+

Work.

Built at work and alongside it. Open a row for the problem, what I did, and what happened.

01 / Product, built solo

CodeScape

Explore any codebase like a city.

Code analysis · 3D visualisation · GitHub API

→

Also: a backend and DevOps portfolio, client products and a few experiments. Archive (10) →

Background.

11 roles across payments, platforms and products. Some of them at once.

Aug 2025 → now
Distributed Node.js and TypeScript services powering payment workflows across 15+ African markets.
- Event-driven transaction pipelines on RabbitMQ, with asynchronous processing, retries, idempotency and failure recovery across services.
- Transaction state management and reconciliation for the cases that matter: provider failures, delayed events and partial failures.
- Python tooling for production monitoring, operational analysis and transaction investigation, using data to find bottlenecks and anomalies.
Jan 2024 → Aug 2025
The full frontend ecosystem for global remittances: a Next.js site, a React admin and a React Native app.
- Standards and shared libraries that made feature delivery 3x faster.
- Responsive TypeScript and Tailwind interfaces with caching: dashboard latency down 65%, WCAG accessible.
- Jest and React Testing Library to 80%+ coverage, cutting bugs in payment gateway integrations with Java backends.
Sep 2022 → Dec 2024
Event-driven Java (Spring Boot) and Go microservices on RabbitMQ and Kubernetes (EKS).
- 2M+ requests at 99.9% uptime.
- AWS infrastructure (EC2, RDS) with Docker, Terraform and GitHub Actions; queries cut from 8.4 s to 420 ms with PostgreSQL and Redis optimisation.
- Spring Security OAuth2/JWT for PCI-DSS compliance, Go CLI tools, and Prometheus observability that cut incident detection time.
Feb 2023 → Feb 2024
A Next.js, React and TypeScript eSIM platform and dashboard for 500+ partners.
- Multi-customer features that made partners 3x more efficient.
- Code splitting and SSR: load times down 35% while meeting WCAG 2.1 AA.
- Real-time WebSockets for consistent APIs and smoother workflows.
Jul 2022 → Feb 2023
A Next.js platform for an AI customer-support product, and the layer between it and the models.
- A Node.js orchestration layer connecting production APIs to Python ML services: 250K+ daily inference requests at under 400 ms.
- RAG workflows with vector databases and Redis that cut primary database load by 61% under concurrent workloads.
- SSR and edge caching for performance.

All 11 roles, in detail →All 59 tools →yes, some of these overlap.

Lab.

Things to poke. One at a time.

Fun zone: a guessing game

Writing.

Research, and Engineering Judgment across the platforms I post on.

Predictive auto-scaling: LSTM vs. Transformers on real cluster tracesLSTM and Transformer forecasters at the same ~30K-parameter budget, on Alibaba and Google traces. Mostly, neither beat a naive baseline, and which way the data transferred mattered more than the architecture.M.Sc. dissertation, University of East London / Aug 2026 Cloud Computing in a Regional eHealth System: An AWS-Based ArchitectureA secure, compliant, multi-tier AWS architecture for a regional eHealth system, with the security, compliance, disaster recovery and cost trade-offs argued out.M.Sc. Cloud Computing report, University of East London / Feb 2026 Deep Learning Based Custom Image Multi-Class ClassifierA CIFAR-10 classifier built on VGG19 with transfer learning and data augmentation, reaching 91.3% test accuracy.M.Sc. Artificial Intelligence and Machine Vision report, University of East London

NowBuilding RelayMQ, a local-first message broker in Rust.

NextShipping RelayMQ, more Engineering Judgment, and writing up the Lab simulator. Now page →

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