Client work
SignFlow
Approval routing, signatures and sealed documents.
Architect & sole engineer
Read case studyThe systems, and the
thinking behind them.
Business systems, independent demonstrations,
and the work in between.
23 case studies · 73 projects in all
Compact archive
Client work
Procurement Intelligence
Supplier offers turned into explicit purchasing decisions.
Architect & sole engineer
Read case study
Client work
Dispatch
Bulk email with tenant isolation, controlled sending and safe failure handling.
Architect & sole engineer
Read case study
Demonstration
Sealed
Approval routing and document sealing, using invented data.
Architect & sole engineer
Read case study
Client work
Pikora
From web frontend contribution to end-to-end mobile product delivery.
Full-Stack & Mobile Engineer
Read case study
Case study
Furniture Valuation CV Pipeline
Image-based furniture evaluation, resale prediction and scam detection.
ML / AI Engineer
Read case study
Case study
Interior Scene Segmentation Pipeline
Fine-tuned vision models for precise interior scene segmentation.
AI / ML Engineer
Read case study
Case study
CarCheck NG
Vehicle history reporting for Nigeria. A working MVP with mock data adapters disclosed throughout.
Architect & sole engineer
Read case study
Case study
Cooperant
A pre-launch native savings-group product spanning member apps, employer payroll workflows and controlled financial operations.
Product Architect & sole engineer
Read case study
Case study
Naija Fashion Marketplace
A pre-launch native iOS marketplace prototype joining editorial discovery, shoppable short video and Lagos-first commerce.
Product Designer & iOS Engineer
Read case studyLeaveDesk
A working demo of a leave and approval portal: an escalation ladder derived from policy and carrying its own reason, an approvals queue that separates your turn from someone else's, a permission matrix rendered from the rules the server enforces, and impersonation that names the real actor.
Architect & sole engineerOpsPilot
A portfolio piece demonstrating multi-tenant SaaS architecture: a workspace-isolated data model, a server-enforced Owner/Admin/Member RBAC matrix, server-action workflows, and an 8-page client/project/task suite.
Architect & sole engineerRecko
Reconciliation engine with reference and amount/date tolerance matching and automatic break categorisation, plus a tiered/percent/fixed commission engine with refund reversal and a live ops dashboard.
Architect & sole engineerOfferGrade
A working demo of supplier-offer intelligence: ingests price lists in four formats and seven languages, normalises them, gates out anything it cannot identify with confidence, and scores the rest BUY / NEGOTIATE / REVIEW / IGNORE with per-line reasoning.
Architect & sole engineerFlowForge AI
A portfolio piece demonstrating LLM automation built to production shape: structured JSON extraction with fail-closed Zod validation, confidence-based routing to a human review queue, prompt versioning, and per-run step logging.
Architect & sole engineerAI Call Analysis
Async upload-to-analytics pipeline with a resilient Whisper → faster-whisper → mock transcription chain, GPT-4o-mini QA scoring against weighted parameters with a heuristic offline fallback, and PDF/CSV export.
Architect & sole engineerAI Marketing RAG Assistant
Hybrid BM25 + semantic retrieval over ChromaDB, grounded generation with hallucination and brand-voice quality scoring, and a cron/event trigger engine dispatching campaigns to email, Slack and webhooks.
Architect & sole engineerPE Deal Sourcing & Qualification
BANT-based lead qualification via LLM with a deterministic heuristic fallback, a multi-stage deal pipeline state machine, and real-time funnel and conversion analytics.
Architect & sole engineerSupplier Offer Ingestion & Normalization
Two-phase Python pipeline: MSAL device-flow ingestion of price-list emails from Microsoft Graph, then a 2,287-line heuristic normalizer handling header detection, headerless tables, and net-vs-RRP price classification.
Data & Systems EngineerDataHarbor
A portfolio piece demonstrating a scraping and data-quality pipeline: a dependency-free Python engine (fetch, clean, validate, dedupe, export) bridged into a Next.js operator dashboard with a 9-screen workflow and live data-quality analytics.
Architect & sole engineerStyle DNA
A working demo of visual fashion discovery: per-garment detection rather than whole-photo embedding, content-hash caching, an interpretable eight-dimension vector space, and a brand-diversified feed where every result explains why it surfaced.
Architect & sole engineerArtika Studio
AI art studio for interiors: room-photo analysis with server-side palette extraction and vision-model wall detection, artwork generation and recolouring, drag-to-place composition, and an exportable placement report.
Architect & sole engineerModern Abaya E-commerce
Storefront and admin dashboard with Paystack payments, an S3 image pipeline, drag-and-drop product reordering, and real-time cart state.
Full-Stack DeveloperMore from the archive
Smaller builds and focused experiments.
Personal Portfolio & Engineering Journal
This site. Next.js 15 App Router with an MDX case-study engine, a MongoDB-backed contact pipeline with email notification, view-transition routing, and full SEO infrastructure.
Designer & EngineerNext.js 15React 19TypeScriptTailwind CSSMDXMongoDBFramer Motion
collinsmadu.comSAM3 Text-Prompted Segmentation Pipeline
Fine-tuned SAM3 inference with a tiled scheme — feathered overlap and max-confidence compositing — that segments high-resolution images without seam artifacts, packaged as a client-deliverable notebook workflow.
ML EngineerPythonSAM3PyTorchJupyter
Finance Automation — Blotter & FX Treasury
A Node blotter-consolidation service (file watcher, column mapping, per-source dedup, timezone-aware weekly email with failure alerts) plus a Python FX treasury pipeline with Prophet forecasting and MAE/MAPE backtesting.
Automation EngineerNode.jsPythonProphetMongoDBFastAPIReactRecharts
Cooperant
A pre-launch managed-savings product for Nigerian corporate workers: native SwiftUI and Jetpack Compose member apps backed by a Spring Boot platform with employer and operations portals, a balanced ledger, payroll reconciliation, independent payout approvals, and live payment, identity, messaging and push-provider adapters.
Product Architect & sole engineerSwiftUIKotlinJetpack ComposeJava 21Spring BootPostgreSQLFlywayDocker
Employee Leave & Approval Portal
Leave management with multi-level approval workflows, RBAC including super-admin impersonation and audit logging, Azure AD SSO, reimbursables, and SendGrid/Teams notifications.
Full-Stack EngineerTypeScriptReact 19Express 5MongoDBAzure AD / MSALMicrosoft GraphSendGridRecharts
Play & Win Platform
White-labelled promotional gaming platform built solo and running on in-store kiosk tablets: one product delivered to two targets — a React web build for the kiosks and an Expo/React Native Android build for customers’ own phones. Arabic RTL throughout, WhatsApp OTP registration with international country selection, and games including a Skia-animated Spin the Wheel, Catch the Item, Memory Match, a gift-box reveal and a timed Tic Tac Toe against an AI opponent — each issuing redeemable prize codes.
Full-Stack DeveloperReactExpoReact NativeSkiaExpressMongoDB@zxingNetlify
Private LLM / RAG Document System
Secure retrieval-augmented generation with document ingestion, vector indexing, auth-aware query APIs, and structured JSON outputs for enterprise use.
AI EngineerPythonLangChainVector DBFastAPIOpenAI
YOLO Object Detection API
Custom YOLO model trained with Ultralytics, exported to ONNX, and served as a real-time inference API behind FastAPI and Docker.
ML EngineerPythonUltralyticsONNXFastAPIDocker
Scam Detector API
Perceptual-hash (pHash) duplicate-image fraud detection for marketplace listings, exposed as a batch /check_scam endpoint and packaged as a Docker image for an ingestion pipeline.
Backend / ML EngineerFastAPIMongoDBpHashDocker
GreetIQ — AI Voice Receptionist
Voice-receptionist backend ingesting Vapi call webhooks with HMAC-SHA256 signature verification, classifying leads, and serving an admin API behind a React dashboard.
Backend EngineerNode.jsExpressMongoDBVapiReact 19
Dealer Detector
Rule-based NLP classifier labelling car-marketplace sellers as dealer vs. private flipper across 30+ weighted signal flags, with multi-currency price normalization and a batch-CSV service.
Python / NLP EngineerPythonFastAPIpandasRule Engine
Crypto Price Predictor
End-to-end ML price prediction: multi-source market scraping, engineered technical indicators, a RandomForest next-day movement classifier, and a served API with Streamlit and Next.js frontends.
ML EngineerPythonscikit-learnFastAPIStreamlitNext.jsRailway
Outlook Attachment Ingestion & Price Comparison
Multi-phase pipeline ingesting supplier price-list attachments from Outlook via Graph/MSAL, normalizing with fuzzy matching and EAN validation, and generating a cross-supplier comparison.
Data EngineerPythonMicrosoft GraphMSALSQLAlchemypandas
Hair Price Extractor
OCR and vision-model extraction turning messy supplier price-sheet images into a validated, format-preserving Excel workbook, with per-supplier YAML rules, anomaly flagging and auto-generated review sheets.
Automation EngineerPythonOpenAI VisionPydanticopenpyxlYAML
UK Baby & Toddler Class Aggregator
Modular Node pipeline aggregating class timetables from 13+ providers via reverse-engineered JSON APIs, headless-browser scraping and Tesseract OCR fallback, geocoded and deduplicated into a national directory.
Data EngineerNode.jsPuppeteerPlaywrightCheerioTesseract.jsGoogle Places APISupabase
Franchise Scraper
Multi-source Node scraper aggregating UK franchise class listings from JSON APIs and HTML, geocoding via Google/OpenStreetMap with caching and progressive fallback, normalized to a unified 30-field schema.
Data EngineerNode.jsPuppeteerCheerioGoogle Places APIOpenStreetMapSupabase
WooCommerce / Shopify Product Scraper
Generalized YAML-configurable scraper with sitemap and collection discovery, optional Playwright rendering, UA rotation and backoff retries, exporting normalized product import CSVs.
Data EngineerPythonPlaywrightYAMLpandas
URL & Email Extraction Crawler
Configurable depth-N crawler and email harvester with same-domain scoping, skip-trap filters and a clean modular architecture.
Python EngineerPythonrequestsBeautifulSoup
Dermstore / Eminence Review Scraper
Multi-site scraper extracting per-product review counts across four skincare retailers on three different review platforms — handling shadow-DOM widgets, lazy loading, concurrency and retry passes.
Data EngineerNode.jsPuppeteer-extraPlaywrightp-queueExcelJS
Alibaba Supplier Scraper
Playwright-driven supplier scraper with CAPTCHA-aware session persistence and cookie injection, parsing company profiles into a structured multi-sheet Excel workbook.
Data EngineerPythonPlaywrightopenpyxl
Family-Friendly Lead Scraper
Google Maps lead scraper filtering businesses by rating, then crawling their sites to extract qualified contact emails into per-city CSVs.
Data EngineerNode.jsPuppeteer-stealthCheerio
Marrakech Hotels Lead Pipeline
Four-stage pipeline scraping Booking.com listings, enriching via Google Maps, and producing a cleaned, deduplicated leads CSV.
Data EngineerPythonPlaywrightpandasGoogle Maps API
Jimshooter Site Archiver
Polite same-domain crawler and multi-stage export pipeline that archived and indexed an entire site's pages and download links.
Python EngineerPythonrequestsBeautifulSoupJSONL
Shopify → WooCommerce Migration Scraper
Product migration tool consuming the Shopify products.json API and generating WooCommerce import and ACF variant CSVs for a store migration.
Data EngineerPythonShopify APIpandas
AI E-commerce Scraper
Amazon scraping service pairing a Selenium anti-detection bot with a FastAPI + MongoDB backend and a Streamlit control UI.
Full-Stack / Data EngineerPythonSeleniumFastAPIMongoDBStreamlit
Leave Portal Documentation Site
Live Docusaurus documentation site for an internal HR product: ~550 lines of task-based MDX guides with 70+ annotated screenshots, a customised React theme, and a Netlify pipeline with security headers.
Technical Writer & EngineerDocusaurus v3ReactMDXNetlify
Internal IT Operations & Security
Endpoint and account management, biometric integration, access reviews, and internal security practice for a small firm.
IT OperationsAzure ADMicrosoft 365BiometricsSOP Design
Artwork-on-Wall AI Preview
R&D exploration for realistic AI image placement on walls — ControlNet, MiDaS depth estimation and Segment Anything for room-aware compositing, prototyped in Gradio and Streamlit.
AI EngineerPythonControlNetMiDaSSegment AnythingGradioFastAPI
News Quote — Strapi CMS Backend
Headless CMS backend for a political-quotes and fact-check platform: ~13 interrelated content types and a moderation lifecycle that auto-publishes community submissions with deduplicated, verified citations.
Backend EngineerStrapi v4Node.jsGraphQLRESTPostgreSQLRailway
Hilance / Roboti Landing Page
Full-stack marketing site with a contact-form email relay and a deduplicated newsletter subscription flow with automated confirmation emails.
Full-Stack DeveloperReactTailwind CSSExpressMongoDBNodemailerDockerRailway
Next.js E-commerce Enhancements
Cart badge sync, real-time state, admin order visibility, and a shared component system across a live storefront.
Frontend EngineerNext.jsReactTypeScriptTailwind CSS
AI Market Insights Dashboard
Classical data processing combined with LLM narrative generation to produce analyst-quality market reports with interactive visualisations.
Data / AI EngineerPythonFastAPIPandasscikit-learnOpenAIReact
Political Quote Extraction System
Daily pipeline: scrape news sites, extract politician quotes via LLM, entity-match to a CMS, deduplicate, and surface a review interface.
AI / Automation EngineerPythonOpenAI GPTPlaywrightStrapiNode.js
Lead Enrichment → CRM Pipeline
Automated lead sourcing, enrichment and deduplicated push into a sales CRM with field mapping and error reporting.
Automation EngineerPythonBreakcold APIPandasREST APIs
Shopify Product Description Automation
Bulk LLM generation of product copy written back to a live Shopify catalogue with tone control and rollback.
Automation EngineerPythonOpenAI GPTShopify API
Social Media Poster Automation
Scheduled multi-platform content generation and publishing with per-channel formatting.
Automation EngineerPythonOpenAI GPTSocial APIsCron
Blog Post Automation
Topic-to-published-article pipeline with outline generation, drafting, image selection and CMS publishing.
Automation EngineerPythonOpenAI GPTCMS APIs
Etsy Review Scraper
Review extraction with pagination handling, rate limiting, and structured CSV export.
Data EngineerPythonPlaywrightPandas
Google Maps Business Scraper
Location-scoped business extraction with contact enrichment and per-city CSV output.
Data EngineerPythonPlaywrightPandas
News Quote — Remix Admin & Scraper
Remix admin tool scraping news articles with a stealth Puppeteer browser and extracting politician-attributed quotes via GPT-4o, persisting deduplicated results to a CMS on a daily cron.
Full-Stack EngineerRemixTypeScriptPuppeteerOpenAIStrapiDocker
Scraper Admin Tool
React + Express/Puppeteer admin that scrapes article URLs and associates extracted data with entities in a CMS, with debounced search and live scrape logs.
Full-Stack DeveloperReactExpressPuppeteerStrapi
Inview.nl Authenticated Scraping
Session-authenticated extraction behind a login wall with token refresh and structured export.
Data EngineerPythonPlaywrightRequests
Buku.app Book OCR Pipeline
Authenticated login, page-by-page capture across PDF/canvas/XHTML rendering, OCR fallback, and structured text + metadata output.
Data EngineerPythonPlaywrightOCRPDF Processing
Android Mobile Expansion
Native Android delivery of an existing product surface, with release signing, bundling and store submission.
Mobile DeveloperAndroidJava/KotlinGradlePlay Console
ERPNext Setup & Operations
Deployment, module configuration, user and role setup, and operational rollout for an internal ERP.
ERP EngineerERPNextFrappePythonMariaDBLinux
Odoo Evaluation & Workflow Mapping
Business process mapping, module fit assessment, and a migration recommendation against existing workflows.
Systems AnalystOdooProcess MappingBRD
Artika Price Builder
Configurable pricing engine for print products across sizes, framing options and materials, with margin rules.
Full-Stack DeveloperTypeScriptReactPricing Rules
Artcha / Artika Workflow Automation
Metadata generation, listing preparation and publishing automation for a digital art catalogue.
Automation EngineerPythonOpenAI GPTREST APIs
Artika GPT Workspace & SOPs
Structured workspace setup with folder organization, SOPs, templates and tone consistency for a creative brand.
Process / Knowledge EngineerOpenAI GPTDocumentationSOP Design
Bulk Image Upload & Share Platform
Bulk image uploading, gallery sharing, and scalable object storage with signed access.
Full-Stack DeveloperReactNode.jsExpressAWS S3MongoDBNetlify
Working togetherSomething worth
Something worth
building?
Tell me about the workflow, the team,
or the problem you keep working around.
What do you charge?
€70 an hour as a baseline, covering architecture, backend, frontend, deployment and documentation. Where a project can be scoped properly up front, I prefer to quote a fixed price.
When could you start?
Usually within a week, sometimes the next day. The variable is how much research a project needs before I can scope it responsibly. Most engagements run four to twelve weeks; some become ongoing work.
Can you take over an existing codebase?
Regularly. Several projects here began as existing repositories. The case studies explain what I inherited, what I changed, and the role that was mine.
How do you handle confidential work?
Client systems are described by sector, never by name. I share the problem, my contribution and the stack without exposing client data or private source. Any permitted demo captures use invented data. The artwork here is conceptual.
What do I get at the end?
A deployed system, the repository, and documentation written for whoever runs it next: architecture notes, a runbook, and operator SOPs.