
Femi Olatubosun
Verified Expert in Engineering
Back-end Developer
Ikeja, Lagos, Nigeria
Toptal member since June 16, 2026
Femi is a senior back-end engineer in TypeScript whose work spans Wander's luxury short-term rentals, fintech payments, and a beauty marketplace. He takes systems from schema design to production: full back ends, payment systems where money never goes missing, and software that runs rental portfolios hands-free. Femi's work is defined by reliability—payouts that complete or reverse automatically, queues that don't drop jobs, and monitoring that pinpoints exactly what broke and where.
Portfolio
Experience
- AdonisJS - 4 years
- TypeScript - 4 years
- NestJS - 4 years
- Redis - 4 years
- OpenTelemetry - 3 years
- Cloudflare R2 - 3 years
- Django - 2 years
- Typesense - 1 year
Preferred Environment
Cloudflare, TypeScript, NestJS, PostgreSQL, Redis, BullMQ, Prisma, OpenTelemetry
The most amazing...
...thing I've built is a marketplace payment system where every payout completes fully or reverses automatically—no money goes missing, no human ever intervenes.
Work Experience
Senior Back-end Engineer
HotSpotsBeauty
- Architected the complete back-end for a beauty marketplace—bookings, wallet payments, real-time chat, social feed, and search—as one coherent system a small team can maintain.
- Built the payment ledger so money never goes missing: every payout completes fully or reverses automatically, and duplicate charges are impossible by design.
- Built a booking engine that runs itself—automatic status transitions and perfectly-timed reminders for every appointment, with no duplicates and no manual work.
- Built search customers actually use: filter by location, availability, and price across services, businesses, and video content.
- Made the platform resilient to third-party failures—a payment provider going down never takes bookings down with it.
- Built a full observability stack with OpenTelemetry trace propagation through BullMQ jobs, Prometheus metrics, Sentry profiling, and daily operational reports.
Product Engineer
Wander
- Engineered core platform systems for Wander, a venture-backed luxury short-term rental company, as it scaled across the US.
- Built the automation engine that runs each property's operational playbook automatically on every check-in and check-out.
- Shipped Stripe payments with bank-account support, instant verification, and fraud alerts routed straight to the team.
- Used an LLM to schedule maintenance tasks safely, by validating every AI-suggested date against real availability before booking anything.
- Built the video pipeline behind property listings: from upload to published, thumbnails included, hands-free at 120 videos a run.
- Routed real-time severe-weather alerts to each property's own channel, filtered so teams only hear what matters.
Senior Backend Engineer (Consulting)
Bexxle Technologies
- Shipped an autonomous lead generation system generating 2,000+ leads per day using agents for multi-step prospect research and scoring, cutting manual work by 80%.
- Built an AI web scraping pipeline—LLM-guided extraction, converting unstructured pages into structured contact data with 95% classification accuracy.
- Delivered multi-model AI infrastructure, which involved OpenAI and Gemini integration with automatic failover and cost optimization for production lead generation.
- Architected RPC-style mono-repo using Hono, Zod, Prisma, and BullMQ with shared packages across API, workers, and modules.
- Built an AI co-pilot for product managers on Cloudflare Workers with sub-100ms response times.
- Designed edge-cached API layer using Cloudflare D1 and Cache API, reducing database load by 70%.
Team Lead, Back-end Engineer
ZeroComplex AI
- Joined as the first engineering hire with the founding team's scope. Contributed to investor pitches, hiring decisions, team structure, and engineering culture alongside the CTO/CPO.
- Built ChurchAI, a RAG-based conversational AI product, securing the company's first paying customer.
- Built Doculess, an agent-powered document extraction product, as the company's first MVP.
- Built CMMA CLI, a code generation tool for AdonisJS modular monolith architecture, enforcing structural consistency and accelerating developer velocity across the team.
- Led a team of 4 back-end engineers across the full product lifecycle.
Lead Back-end Engineer – Crenet Tech Labs
Akiba
- Architected a fintech investment and bill payments platform across 45 models and 80 migrations.
- Integrated 6 financial providers (Paystack, Providus, Interswitch, Bloc HQ, Dojah, Firebase) via a swappable factory pattern.
- Developed Providus withdrawal retry logic across 24 response codes.
- Built a financial cron scheduler covering savings charges, payouts, and cashback auto-transfer.
Back-end Engineer
Pramie Technologies
- Built automated weekly working-hour limits into the nurse booking pipeline, enforcing contractual caps at shift confirmation and bulk assignment to block any booking that would push a candidate over their maximum hours.
- Replaced blanket compliance alerts with per-certification logic and ran a data reconciliation that migrated legacy verification documents from unstructured compliance blobs into a unified, queryable professional-reference system.
- Separated dual-brand candidate communications for the complex-care service line—routing a distinct sender and branded templates by care type—and rebuilt shift classification to correctly categorize overnight shifts.
Experience
CMMA CLI
https://github.com/femitubosun/cmma-clihono-rpc
https://github.com/femitubosun/rpc-monorepo-templateEducation
Bachelor's Degree in Computer Science
Ajayi Crowther University - Nigeria
Skills
Libraries/APIs
Zod, Stripe, FFmpeg, Sharp, Auth
Tools
Sentry, Prisma, Slack, Grafana, RabbitMQ
Frameworks
AdonisJS, NestJS, Django, Jest, tRPC
Languages
TypeScript, Python, Coolify
Storage
PostgreSQL, Redis
Paradigms
Agile Software Development
Platforms
Google Cloud Platform (GCP), Firebase, Amazon Web Services (AWS), Docker, Linux
Other
R2, Cloudflare R2, Testcontainers, BullMQ, Typesense, OpenTelemetry, Prometheus, Pulumi, OpenAI, Gemini, Hono, Paystack, Cloudflare, SigNoz, Google Gemini, Retrieval-augmented Generation (RAG), Networking, IT Project Management, Web Development, HonoJs
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