Hi, I'm
JOSEPH AYUK E.
Backend Lead building multi-tenant SaaS platforms and production AI assistants.$70K ARR delivered. 50+ AI tools shipped. Systems that scale.
About Me
I'm a Backend Lead and Software Engineer with over nine years of experience building systems that carry real production weight — multi-tenant SaaS platforms, domain-driven PostgreSQL schemas, and AI assistants running in front of paying customers, not demos.
At Premonio, I architected a DB-per-tenant multi-tenancy layer using Stancl Tenancy, RBAC and Stripe-billed plan tiers enforced at the API boundary, and led a three-engineer team to $70K in annual recurring revenue. I also built Revie, a first-party AI assistant platform with SSE streaming and 50+ tool-calling capabilities, gated per tenant without exposing provider keys to the browser.
I specialise across the full stack: Laravel backends, Inertia + React frontends with typed RTK Query, PostgreSQL data design, and Neon/Vercel cloud infrastructure. My edge is bringing engineering rigour and multi-tenant systems thinking to every product I touch.
Experience
Software Engineer / Backend Lead
CurrentPremonio
San Francisco, USA · Remote
- Designed and owned the multi-tenant SaaS backend for a RevOps platform serving B2B customers in production — database-per-tenant isolation (Laravel + Stancl Tenancy), domain-based tenant resolution, and tenant-aware queues, cache, and session bootstrapping.
- Architected a layered, versioned REST API with thin controllers, service orchestration, and SQL-facing repositories, separating auth/org concerns from a large PostgreSQL domain engine (views, functions, table handlers) for scenario recalculation, imports, and analytics.
- Implemented commercial SaaS controls — team-scoped RBAC, resource policies, Stripe/Cashier billing, and plan-tier entitlements (seats, scenario caps, feature gates) — enforced at the API boundary, not only the UI.
- Operationalized tenant lifecycle end-to-end: provision DB, versioned schema builds and upgrades, soft-decommission via rename, and Artisan/ops tooling for upgrades and tenant health — reducing risky ad-hoc production schema work.
- Designed and built Revie, a first-party AI assistant platform on Laravel AI + Vercel AI protocol (SSE streaming): multi-mode agents, 50+ tool-calling capabilities with risk tiers, allowlisted generative UI and in-app actions, and per-tenant AI gating without exposing provider keys to the browser.
- Reduced customer friction and consultant dependency by enabling users to navigate and complete workflows through Revie instead of relying on human onboarding support.
- Shipped a hybrid Inertia + React client architecture with a typed RTK Query domain API layer — envelope unwrap, CSRF recovery, tagged cache invalidation — delivering key RevOps surfaces end-to-end.
- Led a team of 3 engineers: owned system architecture and backend delivery, reviewed designs and PRs for tenancy, security, and correctness, and established CI/CD supporting a consistent two-week sprint cadence.
- Codified engineering standards — backend layering, frontend API consumption, AI tool/safety patterns — as reusable architecture docs so a 3-person team could ship consistently without architecture drift.
Tech Lead
CAMTEL
Cameroon Telecommunications
- Led the migration of five legacy applications, including network monitoring and billing systems, to 99.9% uptime with zero remaining critical vulnerabilities.
- Built a proprietary network failure prediction tool that cut Mean Time To Repair by 50%, reduced customer churn by 7%, and directly contributed to 20 new enterprise contracts.
- Introduced Agile/Scrum practices that accelerated feature delivery by 30% and reduced critical bugs by 25%.
- Delivered a technical modernisation roadmap that generated approximately $20,000 in annual operational cost savings.
Software Developer
Vodafone
Cameroon
- Built network monitoring tooling that cut outage identification time by 94% and eliminated over 700 hours per year of manual work.
- Delivered a real-time site-performance dashboard that replaced manual reporting and saved approximately 12 hours per week of data aggregation.
- Automated collection and reporting with ETL scripts, eliminating roughly 8 hours per month of manual report effort, and iterated on operator feedback to drive around 70% adoption and efficiency gains.
Skills
Backend & SaaS Architecture
AI & Platform Engineering
Frontend
Cloud & DevOps
Practices
Projects
Premonio GOALS
A rules-based Go-To-Market simulation engine that replaced manual spreadsheet planning for enterprise sales teams. Architected from concept, launched to paying customers in 6 months.
Revie
A first-party AI assistant platform built on Laravel AI + Vercel AI protocol with SSE streaming — multi-mode agents, 50+ tool-calling capabilities with risk tiers, and per-tenant AI gating without exposing provider keys to the browser.
FiberConnect
Digitized CAMTEL's end-to-end FTTH internet service connection workflow. Customers place fiber internet orders online, track installation status, and schedule technician visits — eliminating agency trips entirely.
Network Failure Prediction System
A data-driven failure prediction engine for CAMTEL's network infrastructure. Analyzed historical network data to predict outages before they occur, enabling proactive maintenance.
Network Monitoring Dashboard
End-to-end network visibility dashboard replacing manual reporting across Vodafone's infrastructure. Aggregated real-time site performance metrics in a single pane of glass.
Mobile SLA Verification Platform
Built from the ground up for Cameroon's National Agency for ICT. Enables monitoring of service-level agreements across 4 mobile operators with automated quality checks.
Brainwave
AI chatting solution landing page built to hone modern frontend skills with sleek animations and cutting-edge UI patterns.
Taxi Trois-Rivières
Full revamp of a Québec taxi company's website to improve UX and dramatically reduce friction in the booking experience.
Hoobank
Pixel-perfect implementation of a modern fintech product landing page translated from a Figma design.
MBWAN Consulting
Professional landing page for a solutions provider company in France, featuring smooth Framer Motion animations.
First Portfolio
My very first online portfolio featuring an immersive 3D experience powered by Three.js and interactive animations.
Ohvaz
Landing page for a Romanian food company, a faithful implementation of a Figma design to sharpen frontend craft.
Contact
Let's Build Something Great
I'm currently open to new opportunities: a full-time role, a contract engagement, or a conversation about building something meaningful together.