Middle Middle+ Backend Software Engineer

· Designed and implemented a scalable CRM and mobile application architecture with NestJS and PostgreSQL for PBX integration, supporting 5,000+ users. · Developed a large-scale analytics module for call and messaging data, enabling real-time reporting and reducing query complexity by 40%. · Optimized APIs and database queries, reducing latency by up to 30% while introducing new features and fixing critical bugs. · Led end-to-end development of PBX call and message workflows. Tech Stack: NestJS, Node.js, Express.js, Type, PostgreSQL, Redis, TypeORM, Docker, Minio, Git, Agile/Scrum

· Developed and optimized a large-scale Fitness Coach platform for 10,000+ active users, implementing complex subion and payment logic with Stripe, improving performance by 20% and reducing payment errors by 30%. · Designed and optimized a social media platform with GraphQL and PostgreSQL, improving query performance by 45% and supporting 3,000+ active users. · Maintained and enhanced CRM features for social applications, fixing critical bugs and implementing new functionality to improve user experience. Tech Stack: NestJS, Node.js, Express.js, Type, GraphQL, PostgreSQL, TypeORM, KnexJS, Stripe, Firebase SDK, Docker, AWS (S3, CloudWatch), Git, Agile/Scrum

· Built CRM, Booking, Fitness, Investment, Learning, and Trading applications from scratch using REST APIs and PostgreSQL. · Integrated Firebase SDK, Stripe, AWS S3, CloudWatch, and Redis, reducing API latency by up to 35%. · Audited and refactored the database object model, improving schema consistency and maintainability. · Integrated multiple third-party APIs to extend application functionality and enable seamless data exchange. Tech Stack: NestJS, Node.js, Express.js, Type, PostgreSQL, MySQL, Redis, TypeORM, Firebase SDK, Stripe, Docker, AWS (S3, CloudWatch), Git, Agile/Scrum

Developed and scaled CMS, CRM, and Audit systems using a microservices architecture to support 150M+ monthly active users with NestJS, Kotlin, MongoDB, and Kafka. · Collaborated with cross-functional teams to deliver high-quality backend solutions, ensuring smooth deployment and post-release monitoring. · Integrated APIs from other service teams to support internal integrations. · Performed unit and integration testing, deployment validation, and post-deployment monitoring. Tech Stack: NestJS, Node.js, Express.js, Type, Microservices, Kotlin, MongoDB, Mongoose, Elasticsearch, Docker, Kubernetes, Kafka, Grafana, Git, Agile/Scrum