Yashwanth Sagar

Tech lead with 11+ years of experience building scalable backend systems and production-grade products across healthcare, analytics, and SaaS. Experienced in designing reliable architectures using Node.js, NestJS, microservices, Kafka, Redis, PostgreSQL, and MongoDB, with hands-on ownership of performance, delivery quality, and engineering standards. Strong track record translating complex business requirements into systems that scale, mentoring engineers, and collaborating across product, design, QA, DevOps, and architecture teams.

Tech Lead at MSys Technologies (2022-10 – 2025-10)

• Led engineering delivery for a B2B healthcare SaaS platform at SVAAS Wellness (Dr. Reddy's), serving ~15,000 users across 3 enterprise tenants, with ~5,000 users interacting with health-metric workflows daily.
• Led 6 developers and 2 QA engineers with formal responsibility across development, QA, and DevOps, while collaborating regularly with product managers, designers, business analysts, and architects.
• Reduced response times on critical APIs from ~10 seconds to under 1 second (>90% improvement) by removing quadratic computation paths and optimizing backend processing.
• Designed and evolved a multi-tenant architecture using microservices, Kafka, Redis, API Gateway, and tenant-aware services for configurable healthcare programs and high-volume health-data workflows.
• Raised automated test coverage from 0% to ~80% and introduced coding/review standards across SVAAS repositories, reducing production issues from ~10-12 per sprint to 1-2.
• Reviewed ~12-15 PRs per week, mentored 8 engineers, and supported MSys in hiring 4 engineers; backend optimizations also reduced server load and associated infrastructure costs.

Tech Lead at DATAKYND LLP (2021-10 – 2022-09)

• Architected VitalBridge as a multi-tenant healthcare SaaS platform, supporting distinct workflows for Super Administrators, Tenant Administrators, Providers, and Patients while maintaining tenant-aware access boundaries.
• Designed a distributed platform containing of 13+ independently scoped backend services, including API Gateway, Identity, Tenant Registry, Communications, Audit Logging, and Analytics
• Defined an event-driven architecture using Kafka with service boundaries designed around healthcare domains rather than tightly coupled monolithic application.
• Introduced CQRS and transactional-outbox patterns for workflows requiring reliable asynchronous communication, with idempotent event consumers designed to prevent duplicate processing.
• Designed the persistence of infrastructure model around PostgreSQL, Redis, Kafka and containerized services, separating transactional workloads, caching and asynchronous processing responsibilities.
• Designed tenant-aware authorization and RBAC, propagating tenant identity through authenticated requests and enforcing tenant and role checks independently with individual services instead of relying on gateway-level authorization.
• Architected a comprehensive provider scheduling and appointment system supporting recurring weekly availability, schedule overrides, leave/block periods, time-zone handling and variable 15/30/45/60-minute appointment durations.
• Designed complete appointment lifecycle workflows covering booking, confirmation, cancellation, and rescheduling, together with both in-person and video consultation types.
• Designed provider onboarding capable of modelling healthcare-specific information including specialties, certification/enumeration dates, practice locations, mailing locations, and tenant-provider associations.
• Established shared contracts and reusable platform components across the service ecosystem to reduce duplicated integration logic and maintain consistent communication between servers.
• Designed the system around API-first service boundaries, allowing patient, provider, and administrative experiences to operate against the same underlying healthcare platform while exposing role-specific capabilities.

Senior Software Engineer at Fragma Data Systems (2021-01 – 2021-10)

• Built an analytics platform for banking systems with optimized frontend and backend performance.
• Reduced frontend load time using code-splitting, CDN caching, and bundle optimization.
• Improved API response times by optimizing backend data flows and payload structures.

Software Engineer at Colosseum Group (formerly Strateology IT Solutions) (2018-01 – 2020-10)

• Developed HIPAA-compliant healthcare applications with secure authentication and RBAC systems.
• Designed full-stack systems using Node.js, React.js, and MongoDB.
• Implemented encryption, audit logging, and data anonymization for sensitive patient data.
• Worked directly with clients to define requirements and deliver scalable solutions.

Software Engineer Trainee at Encierro Software (2015-03 – 2018-11)

• Worked on Big Data systems using Hadoop, Spark, and Cloudera.
• Assisted in building ETL pipelines and data-ingestion workflows.
• Built foundational full-stack experience using Node.js and Meteor.js.