01 / Engineering case studyPrivate beta · Arc testnet
ArcLedger
Exact-money stablecoin bookkeeping with resumable blockchain ingestion.
Re-import the chain. Keep the bookkeeping.
Esen Urer / Full-Stack Software Engineer
Building systemswhere correctnessmatters.
FinTech, applied AI and data-intensive software.
From the interface to the invariants underneath.
Selected engineering workScroll to explore ↓
01 / Featured projects
Real systems.
Decisions you can inspect.
The failure modes, boundaries and trade-offs behind four substantial builds.
02 / Engineering case studyLive · Production
Bite Relay
From a table QR code to payment to a physical kitchen printer.
Four runtimes. One authoritative paid event.
03 / Engineering case studyPractice · No live-money path
X Copy-Trade Tool
LLM interpretation with deterministic safeguards and practice-only execution.
The model interprets. The server verifies.
04 / Engineering case studyResearch · Local tool
Assay
A falsification platform for trading strategy claims.
Four claims tested. Four failed. That is the tool working.
A consistent engineering approach
Different systems.
The same questions.
Correctness over convenience
Exact money and independently reconstructed results.
AI with deterministic boundaries
Interpretation is useful. Execution authority is earned.
Security after the happy path
Test access across tenants, not just within a working UI.
Software meets the real world
Private venue networks. Physical printers. Irreplaceable files.
Evidence over assumptions
A confidence score needs provenance. A verdict needs verification.
02 / Supporting systems
Useful by design.
Local tools, chosen because they fit the job.
Leadworks
An automated lead generation and enrichment engine for UK trade businesses.
Discover→ Enrich→ Rank→ Excel
≈858 businesses · five trades · about one hour of discovery.
Read case study — LeadworksTheAnythingSorter
A native Windows app for sorting thousands of photos and videos by keyboard.
Preview→ 1–9 → move→ Next→ Ctrl+Z
Preview → number key → move → next. Ctrl+Z to undo.
Read case study — TheAnythingSorter03 / Commercial delivery & front-end craft
Selected web work.
Client and product websites across three front-end stacks. A different scale of work, with the same attention to delivery.
Client work · LiveVisit website — RPM Facilities, opens in a new tab
RPM Facilities
Facilities and construction website, from responsive pages to a custom-domain launch.
HTML / CSS / JS / Vercel / Formspree
Delivery notes
DNS migration, permanent redirects, strict CSP, responsive WebP assets and structured data. A privacy-aware Formspree enquiry flow completes the delivery.
Live · Product websiteVisit website — My First Coin website, opens in a new tab
My First Coin website
A transparency-first project website with validated configuration and safe defaults.
Next.js / Zod / Vitest / Playwright
Delivery notes
Security headers, generated social previews and deliberate feature flags. No fabricated project data and no wallet connection. This entry concerns the website, not the token.
Demo · Stripe test modeVisit demo — Baklava & Beyond, opens in a new tab
Baklava & Beyond
A dessert storefront with portion pricing, a persistent cart and hosted checkout.
Next.js / Stripe / Resend
Delivery notes
Catalogue, checkout and order-confirmation email integration. No real payments are being taken. Stronger server-side checkout fixes were on an undeployed branch in the reviewed evidence.
Live · WebsiteVisit website — Café Crofton Park, opens in a new tab
Café Crofton Park
A café website with Google reviews served through a server-side API proxy.
React / Vite / Express / Google Places
Delivery notes
The Places API key stays on the server. Opening-hours UX, gallery, maps and delivery links make the site useful before a visit.
Anonymised client workVisit website — Mobile Car Repair / Smart Repair, opens in a new tab
Mobile Car Repair / Smart Repair
Framework-free delivery with before/after sliders and a WhatsApp quote flow.
HTML / CSS / JS / Google Maps
Delivery notes
Dynamic gallery, keyboard and touch interactions, and a service-area map. Enquiries open WhatsApp without a backend. Public material is anonymised.
Anonymised demoVisit demo — Pressure Washing Services, opens in a new tab
Pressure Washing Services
A visual marketing site built around video, a large gallery and a lightbox.
Next.js / Motion / Formspree
Delivery notes
Front-end and visual-design evidence. Reviews and statistics in the demo are placeholders, not verified business claims.
Live showcase · Form incompleteVisit website — Custom Catering Conversions, opens in a new tab
Custom Catering Conversions
A catering-vehicle website with service, process and case-study galleries.
Next.js / Tailwind / CSP
Delivery notes
Hero carousel, conversion galleries and security-policy work. The reviewed live quote form does not submit enquiries; a connected implementation existed on an unmerged branch.
Not deployed · EN / FR
Les Résidences Djile 2 Djoko
A bilingual lodging site with separate language URLs and translated accessibility text.
HTML / CSS / JS / Internationalisation / Structured data
Delivery notes
Custom translations, hreflang, translated image descriptions and ARIA labels, lodging schema and reduced motion. Unverified information and generated imagery are labelled.
04 / About the engineer
Build it.
Question it.
Make it better.
I’m Esen Urer, a full-stack software engineer interested in the places where software meets real consequences.
My work spans FinTech, applied AI, data-intensive systems and secure software. The common thread is practical: represent money exactly, enforce tenant boundaries, verify model output and be honest about uncertainty.
Building useful software has led me toward a more deliberate engineering practice. I revisit earlier work, audit assumptions and fix mistakes rather than edit them out of the story. The case studies show that progression through decisions and evidence.
Tools, with somewhere to point.
Application deliveryTypeScript / JavaScript · React / Next.jsApplied AI and automationPython · FastAPI · API integrationsData modelling and tenant boundariesSQL · PostgreSQL · Drizzle / PrismaLocal data workflowsSQLite · SQLAlchemy · Google APIsNative desktop softwareC# · .NET · WPFCloud and physical systemsVercel · Railway · Stripe Connect