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Hi, I'm King Etiosasere, a Backend Engineer with over 4 years of experience. I enjoy building products, solving problems, and delivering backend solutions that meet real business needs. Tech Stack: Node.js, TypeScript, NestJS, PostgreSQL, MongoDB, and others. Outside of work, I enjoy drumming as a creative outlet.…

King Etiosasere

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Hi, I'm King Etiosasere, a Backend Engineer with over 4 years of experience. I enjoy building products, solving problems, and delivering backend solutions that meet real business needs. Tech Stack: Node.js, TypeScript, NestJS, PostgreSQL, MongoDB, and others. Outside of work, I enjoy drumming as a creative outlet.…

Available to hire

Hi, I’m King Etiosasere, a Backend Engineer with over 4 years of experience. I enjoy building products, solving problems, and delivering backend solutions that meet real business needs.

Tech Stack: Node.js, TypeScript, NestJS, PostgreSQL, MongoDB, and others.

Outside of work, I enjoy drumming as a creative outlet.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Work Experience

Snr. Backend Engineer/Tech Lead at Peerless SGC

June 1, 2023 - Present

Contributed to building the first core banking application in Nigeria (SeaBaas). Architected and provided technical oversight for high-throughput transaction APIs processing thousands of requests per minute. Led and mentored multiple engineering teams across critical domains including Trade & Treasury, Customer Suite, Card Issuance, Notifications, and Branch transactions built with NodeJS, Express, and Nest.Js. Established technical standards and best practices, conducted thorough code reviews, and provided architectural guidance to ensure code quality and scalability.

Consultant (Backend Engineer) at Daba Finance

December 31, 2023 - July 13, 2025

Implemented and established foundational codebase for all microservices using NodeJS, GraphQL, and MongoDB. Guided and supervised backend engineering teams during development cycles. Introduced GraphQL technology with federation via Apollo to underpin backend architecture. Played key roles in wallet infrastructure, robust financial transactions, asynchronous messaging with Kafka, and notification systems. Contributed to platform growth from zero to over 20,000 active users. Maintained multiple microservices, authored backend documentation, led feature planning, and mentored junior engineers.

Backend Engineer (Part-Time) at Care Plan 365

January 1, 2020 - Present

Led development of backend systems including REST APIs for administrative functions, doctor dashboards, and a mobile app. Designed and implemented features for patient information access, mental assessments, treatment plans, billing functionality, and third-party API integrations for health-related billing in Australia. Developed search functionality for dashboards using Node.js, MongoDB, and Express.js to build scalable backend infrastructure.

Backend Engineer Intern at Podroom

August 31, 2019 - July 13, 2025

Implemented job queues for automatic money disbursement to podcasters improving server efficiency by moving slow tasks to asynchronous processing using RabbitMQ and Bull. Set up Hasura and integrated GraphQL with REST APIs for mobile app data aggregation. Extended Sails.js server to work with GraphQL server to speed up mobile app video uploads. Migrated legacy code to modern Javascript (ES6+). Integrated cloud services for content management enhancing system response times.