Olayinka Olawale

Senior Backend Engineer with 5+ years of experience building scalable Node.js microservices, real-time APIs, and distributed cloud infrastructure across blockchain, healthcare, and fintech domains. Proven track record reducing API latency by 70%, cutting load times by 45%, and maintaining a 100% fund safety record across audited Solidity smart contracts. Deep expertise in TypeScript, NestJS, PostgreSQL, GCP, AWS, and Kubernetes, with end-to-end ownership of blockchain backend systems integrating Web3.js, ERC-20/ERC-721, and cross-chain infrastructure.

Senior Backend Engineer & Tech Lead - Munchory - Abuja, Nigeria (Hybrid)

(2025-10)

• Architected multi-tenant Node.js/NestJS backend for a food delivery platform, designing scalable service layers supporting concurrent home-cooked meal bookings, chef scheduling, and multi-vendor management.
• Built real-time logistics engine with WebSocket-driven GPS tracking and SLA-compliant delivery status updates, enabling express and instant order flows across distributed rider networks.
• Engineered a subscription scheduling service for recurring weekly meal plans with queue management, conflict resolution logic, and advance delivery booking.
• Implemented role-based access control (RBAC) system with secure vendor dashboards, enabling verified chefs to manage orders, menus, and compliance certifications.
• Designed AI-driven personalisation module in Node.js leveraging user history data to generate meal recommendations, directly increasing user retention potential.

Backend & Cloud Engineer - SalesGroup - Remote (Contract)

(2025-12 - 2026-02)

• Led Node.js backend migration from monolithic architecture to distributed microservices on GCP, improving fault tolerance, horizontal scalability, and deployment independence across services.
• Containerised services using Docker and Kubernetes, designing inter-service API gateway patterns and communication contracts between decoupled backend services.
• Optimised cloud resource allocation, reducing infrastructure costs while maintaining high-availability SLAs across high-traffic periods.

Blockchain Backend Engineer - Buildorz - Remote

(2023-09 - 2026-04)

• Built Node.js and AWS cross-chain backend infrastructure optimising transaction throughput for decentralised applications, reducing processing latency by 70% through code optimisation and targeted database indexing.
• Conducted rigorous Solidity smart contract security audits across ERC-20 token contracts and DeFi protocols, achieving a 100% fund safety record across all deployed contracts.
• Designed and maintained backend APIs integrating Web3.js and Ethers.js for on-chain interactions, wallet connections, and ERC-20/ERC-721 token operations on Ethereum and EVM-compatible chains.
• Mentored cross-functional engineering team, increasing team velocity by 25% through structured code review, pair programming, and knowledge-sharing sessions.

Backend Engineer - MyCareAssistant - Remote

(2024-01 - 2025-03)

• Owned end-to-end Node.js and PostgreSQL backend architecture for a healthcare platform, ensuring HIPAA-aligned data integrity and secure patient record management at scale.
• Engineered Redis caching strategies that reduced API load times by 45%, significantly improving mobile subscriber experience and server throughput.
• Enforced authentication, authorisation, and encryption protocols protecting sensitive user health data to industry compliance standards.

Freelance Backend & Web Developer - Olinkstech Ltd - Abuja, Nigeria

(2021-01 - 2023-12)

• Delivered bespoke PHP-based school management portals for educational institutions, covering student registration, result processing, fee management, and academic session administration.
• Built custom content management systems (CMS) and administrative portals for clients across education and SME sectors, enabling non-technical staff to manage digital content independently.
• Developed multi-role management portals with staff, admin, and parent dashboards, integrating authentication, reporting pipelines, and data export features.
• Maintained full project lifecycle ownership from requirements gathering and architecture through deployment and client handover, consistently delivering on time and within budget.

M.Sc. - Cybersecurity - Bingham University (2024-12 - 2026-02)

B.Sc. - Computer Science - Landmark University (2017-08 - 2021-10)