Full-stack web and mobile engineer with 5+ years of experience delivering high-performance applications across web and mobile platforms. I've led projects end-to-end, in crypto, sports/gaming, e-commerce, and SaaS. I thrive in fast-paced environments where product thinking, technical depth, and execution ownership truly matter.
- Languages: JavaScript, TypeScript, GO, Rust
- Frontend / Mobile: React, Next.js, React-Native
- Backend & Databases: Node.js, NestJS, PostgreSQL, MongoDB, Redis, BullMQ, SQL, Prisma, Gin, Sqlx, Axum, Tokio
- CMS & Infra / Tools: Sanity.io, Strapi, Firebase, Vercel, Git, REST APIs, Digital Ocean, AWS, Docker, Mailersend, Sendgrid, Resend, Tatum, Circle (USDC)
- Led end-to-end development of a high-security digital asset exchange, architecting a non-custodial wallet abstraction that eliminated seed-phrase complexity and reduced onboarding friction for thousands of users.
- Developed solutions and automated processes around network-specific edge cases for Tron, Bitcoin, and Ethereum.
- Designed and implemented a FIDO2-inspired authentication system across mobile and backend, leveraging hardware-bound Secure Enclaves and asymmetric cryptography to achieve 100% zero-knowledge credential storage and secure device-based recovery.
- Engineered high-performance transaction engines and automated fiat rails, reducing asset-to-cash settlement times by over 95% (from hours to <2 minutes) while maintaining secure records with zero loss of funds across concurrent transactions.
- Developed and integrated a complete RBAC system for administrative operations.
- Solo built a real-time fantasy football platform from zero and scaled it to over 2,000 users with thousands of dollars in transactions, handling everything from competition logic to automated payouts with a robust wallet engine, increasing trust and platform credibility among paying users.
- Designed and built secure, documented, and fast end-to-end transaction rails leveraging Circle (USDC) and Solana, allowing for global adoption and speed.
- Delivered a seamless live experience by integrating real-time FPL data, enhancing user engagement and retention.
- Set up monitoring and crash recovery using BetterStack, achieving >99.9% uptime during game weeks.
- Allowed users to sync their FPL accounts by simply authorizing with their FPL credentials, giving the platform superior user-experience compared to competitors and reducing user churn rate by ~30%.
- Maintained project momentum and delivered core functionality despite major team turnover, demonstrating strong initiative and accountability.
- Collaborated closely with product and business teams to align priorities, improving clarity and execution in a fast-changing environment.
- Responsible for core platform modules: Invoicing, Mediakit, and Automation.
- Designed reusable code logic for complex form handling and validations, improving developer experience.
- Developed multiple web templates, allowing users to create and customize their public pages.
- Greenfirst-innovations (NG): Built a fullstack landing page that effectively served the organization's awareness and marketing needs. Sanity CMS was used to allow non-technical users to easily update content on the website.
- DesignKroo (UK): Tackled core flaws on the existing frontend, resulting in improved user experience, lesser churn rate, and increased revenue for the business. Built WordPress templates for the business's WordPress sites.
- ThelockedinMindset (UK): Developed the business website with specific attention to SEO and content editability. Nextjs SEO tooling as well as Google Search Console were leveraged to optimize the website's indexing and improve search results.
- 📧 Email: joshuaokechukwu001@gmail.com
- 🌐 Website: joshthebuilder.dev