Kashif Khan

Backend Developer

Weink • Full-time

Oct 2025 - Present • 10 mos

Maintain and enhance the Back4App and Parse Server backend. Develop secure REST APIs using Node.js, Express, and TypeScript on Google Cloud Run. Strengthen database security through ACLs, CLPs, roles, and access-control rules. Implement API security using JWT authentication, CORS, validation, and rate limiting. Manage push notifications through Firebase Cloud Messaging and Apple Push Notification Service. Integrate external services, including Firebase, Apple App Store Server Notifications, and AndroidPublisher API. Write unit tests to improve backend reliability and code quality. Improve monitoring, logging, performance, and platform resilience. Contribute to Docker-based deployments and GitLab CI/CD pipelines. Support staging environments and the progressive migration of backend services to Google Cloud Run. Collaborate directly with the founder and development team to design and deliver new product features. Troubleshoot production issues and maintain clean, documented, and scalable backend code.

Full Stack Web Developer

SimplifiVAs • Full-time

Apr 2025 - Jul 2026 • 1 yr 3 mos

eveloped and maintained RESTful and Soap APIs using Node.js and Express.js, ensuring high performance and scalability. Integrated SQL (PostgreSQL/MySQL) and NoSQL (MongoDB, Redis) databases for robust data handling and caching strategies. Built secure authentication/authorization systems using JWT, OAuth, and third-party providers. Implemented business logic for products, subscriptions, and user workflows using clean and modular code architecture. Designed and optimized database queries for performance-critical endpoints. Managed cloud deployments using Docker, Nginx, and PM2 on AWS/Ubuntu environments. Collaborated closely with frontend and mobile teams to align API contracts and improve developer velocity. Wrote unit and integration tests using Jest and Supertest to ensure code reliability. Participated in sprint planning, daily standups, and code reviews to deliver features on time.

Senior Software Engineer

Resolut Technologies • Full-time

Jun 2023 - Mar 2025 • 1 yr 9 mos

Leading and mentoring a team of developers, providing guidance and support in their technical growth and project execution. Developing and maintaining server-side applications using Node.js, MongoDB, and Express.js frameworks. Designing and implementing scalable APIs and web services for seamless integration with front-end applications. Collaborating with product managers and stakeholders to understand project requirements and translate them into technical specifications. Writing clean, efficient, and maintainable code, following industry best practices and coding standards. Performing thorough testing and debugging of applications to ensure high-quality software delivery. Optimizing the performance and scalability of applications by implementing appropriate caching mechanisms, database optimizations, and leveraging MongoDB capabilities. Deploying applications using modern deployment tools and processes for availability, reliability, and scalability. Collaborating with front-end developers to integrate user-facing elements with server-side logic. Staying up-to-date with the latest trends and advancements in Node.js development, MongoDB, Express.js, and related technologies. Conducting code reviews and providing constructive feedback to ensure code quality and adherence to coding standards. Troubleshooting and resolving is