Karan R.

With over 12 years of hands-on experience in software engineering, I specialize in building scalable backend systems and high-performance mobile applications that solve real business problems. My work spans fintech, healthcare, e-commerce, logistics, and SaaS industries, where reliability, security, and performance simply can’t be compromised. My core expertise lies in building backend systems with Java and Spring Boot, along with developing mobile applications using Flutter and native technologies. This means I bring end-to-end ownership to every project, from designing the database schema and REST APIs to shipping the final build on the App Store and Play Store. Clients don't need to manage two developers or deal with gaps in communication between teams. I handle both, and I handle them well. What I Build Backend & APIs → Java 8/11/17, Spring Boot, Spring MVC, Hibernate, JPA → Microservices architecture, REST API design, async processing → OAuth2, JWT authentication, role-based access control → Redis caching, performance tuning, high-concurrency optimization → HIPAA & GDPR compliance readiness from day one Mobile Development → Flutter for cross-platform apps — consistent UI across Android & iOS → Native Android in Java/Kotlin, Native iOS in Swift → Production-ready builds optimized for performance, battery, and memory → End-to-end delivery from design integration to App Store/Play Store submission Cloud & DevOps → AWS — EC2, RDS, Aurora, S3, Lambda, SQS, Cognito, CloudWatch, Elastic Beanstalk, Route53 → GCP — App Engine, Cloud SQL, BigQuery, Pub/Sub, Cloud Functions → Docker, Jenkins, CI/CD pipelines — stable, repeatable, and traceable deployments → Database experience across MySQL, PostgreSQL, MongoDB, DynamoDB Results Delivered Across 50+ Projects → Reduced SaaS analytics dashboard load time from 2 minutes → under 5 seconds → Cut fintech platform support tickets by 60% through automated lending workflows → Slashed hosting costs by 25% via AWS Lambda serverless migration → Delivered a HIPAA-compliant tele-audiology system with encrypted video, passed compliance review first attempt → Built school financial planning platform with secure auth and role-based permissions, on time, under budget Industries I Know Well 12 years across sectors means I don't need a learning curve on your domain. I understand the compliance requirements in healthcare, the real-time demands in fintech, the catalog and checkout complexity in e-commerce, and the multi-tenant architecture challenges in SaaS. I speak the business language of each, not just the technical one. → Fintech — loan management, KYC verification, real-time repayments, fraud-aware workflows → Healthcare — HIPAA-compliant systems, tele-medicine platforms, encrypted patient data handling → E-commerce — inventory systems, payment integrations, order management, high-traffic scaling → SaaS — multi-tenant architecture, subscription billing, role-based dashboards, usage analytics → Education — ERP platforms, financial planning tools, student data management More From the Project Archive → Built a modular microservices backend for a logistics platform, each service independently deployable, zero downtime during updates → Integrated third-party KYC and payment APIs for a lending product used across three markets → Developed real-time notification systems using AWS SQS and SES, handling 100k+ daily events → Migrated a monolithic Java application to a Spring Boot microservices architecture, reduced release cycles from monthly to weekly How I Work I begin every project with a thorough discovery process, understanding the business model, mapping out the architecture, and setting a delivery timeline that is realistic. Every week, you get working builds and transparent updates. And if something might slip, you’ll hear it from me early, never after the fact. At handoff, everything is documented, tested, and explained clearly. Post-launch, I stay available for performance monitoring, feature enhancements, and ongoing support because a successful delivery is the beginning of a product's life, not the end of my involvement. What Clients Say "Karan consistently goes above and beyond to ensure smooth project progression." "Transformed our slow legacy system into a high-performance platform, ahead of schedule and under budget."