Mustapha Abdulkareem

Mustapha Abdulkareem Professional Experience Sproxil / Mobile-based brand protection & anti-counterfeiting. Verified 75M+ products globally​ Lagos, NG Backend Developer (Java, Springboot, Node.js, Nest.js)​ July 2025 – current ●​ Spearheaded backend development for two flagship B2B enterprise products: Informer+ (end-to-end supply chain tracking) and Pulse (interactive consumer feedback and rewards). ●​ Architected and built critical microservices for the Informer+ platform, ensuring adherence to GS1 standards and NAFDAC requirements for product serialization. ●​ Engineered the Pulse platform's backend, integrating form builders, a live call center, and a digital/physical rewards distribution system, resulting in a 20% increase in user engagement. ●​ Optimized high-performance database queries using Raw SQL in both Nest.js and Java, bypassing ORM limitations to handle enterprise-scale data loads and reduce query execution time by 35%. ●​ Integrated RabbitMQ for resilient, asynchronous communication between services, improving system reliability by 15%. ●​ Maintained and contributed to legacy Java 8 applications (Servlets, JSP, Tomcat), ensuring stability while migrating key functionalities. ●​ Stack: Node, Typescript, Nest, Java, Microservice, MySQL, RabbitMQ. Sarıtay Bilişim / Enterprise software R&D center. with projects across Turkey, Germany, and Uganda​ Remote, Turkey​ Software Developer (Java, Springboot, Angular)​ June 2022 – Dec 2024 ●​ Designed and deployed a secure HR platform for job posting, applicant tracking, and interview scheduling. ●​ Automated applicant screening and grading, cutting manual review time by 70% using a Spring Boot microservice pipeline. ●​ Redesigned assessment flow for a multi-school E-Learning platform, improving student’s turn in by over 30%. ●​ Optimized teacher onboarding workflows, reducing process time by 50% and increasing onboarding completion rates. ●​ Contributed to backend development of a Hotel B2B marketplace enabling real-time listing and transactions of hotel inventories, resulting in a 15% increase in hotel bookings. ●​ Built lightweight HR modules for hotels to independently manage job posts and applicant pipelines. ●​ Stack: Java, Springboot, Microservices, Postgres, MongoDB, Ionic, Typescript, Angular, Microsoft Azure. CreaCubed Inc / Venture studio building AI-native products across software, hardware, and biotech​ Remote, US​ Backend Developer (Node.js, Nest.js) - Contract ​ July 2024 – current ●​ Engineered a HIPAA-compliant backend architecture for a diabetes-focused mobile application, enabling seamless integration with medical hardware and real-time health monitoring. ●​ Developed a secure in-app video call system, facilitating patient-doctor consultations and increasing patient engagement by 40%. ●​ Integrated real-time language translation using AI/ML collaboration, enhancing accessibility for non-English speaking patients across multiple regions and leading to a 25% increase in international user adoption. ●​ Stack: Node, Typescript, Nest, Mediasoup, MongoDb, Mongoose, AWS, Websocket, SocketIO. Neoclan Technologies/ Technology & integrated services company ​ Lagos, NG​ Backend Developer (Node.js, Nest.js) - Contract ​ May – October 2025 ●​ Pioneered the backend architecture for a new B2B and B2C e-commerce platform, leading the design and implementation of 9 out of 10 core microservices based on business requirements. ●​ Established a resilient, event-driven system using RabbitMQ for asynchronous communication and gRPC for high-performance, low-latency inter-service requests, reducing inter-service communication latency by 60%. ●​ Led and mentored a growing backend team, onboarding two additional developers, establishing coding standards, and overseeing their contributions to the microservices ecosystem, improving team velocity by 20%. ●​ Collaborated closely with a System Analyst and DevOps Engineer to translate business logic into scalable technical solutions and establish CI/CD pipelines, resulting in a 40% reduction in deployment time. ●​ Stack: Nest.js, RabbitMQ, PostgreSQL, Prisma, Redis, gRPC, Microservices. Education Federal University of Agriculture, Abeokuta B. Engr in Civil Engineering ​ First Class Honors 2023 National Youth Service Corps Zeedlabs System (Java, Springboot)​ 2024 Skills Java, Springboot, Node.js, Typescript, Express, Nest, MySQL, Postgres, MongoDB, Prisma, TypeORM, Drizzle, Redis, RabbitMQ, gRPC