Himanshu Dahiya

Optimized Linux kernel and OS-level parameters to improve resource utilization and increase application performance by 25% under production traffic. Implemented a K3s cluster across 50+ dedicated Leaseweb servers; improved compute utilization by 30%. Developed observability stack (Prometheus, Grafana, Alertmanager) integrated with Slack, PagerDuty, and Email; defined SLIs/SLOs for latency (<200ms p95), availability (99.9%), and error budgets. Reduced mean time to detection (MTTD) by 40% and mean time to recovery (MTTR) by 35% by implementing alerting tied to SLIs/SLOs and standardized runbooks. Designed high-availability PostgreSQL cluster with ZFS-backed storage, streaming replication, and pg auto failover; ensured zero data loss and recovery within <60s during failover drills. Optimized Kafka brokers sustaining throughput of 500MB/s; fine-tuned partitioning, replication factor, and JVM GC settings to keep produce and consume latencies under 30ms. Tuned Apache Druid ingestion pipeline to handle 500K events/sec with consistent query latency <300ms. Automated rolling updates for PostgreSQL, HAProxy, and K3s clusters via Ansible, reducing operator toil by 70%.

Designed monitoring framework with Prometheus, Grafana, Rancher, and Sentry, reducing customer-facing issues by 30%. Integrated alerting capabilities across Slack, Microsoft Teams, and Email channels, ensuring swift incident response and sustained 99.9% SLA for microservices. Reinforced system security via Cloudflare, mitigating traffic anomalies, rate limiting, and defending against bot & DDoS attacks, thwarted 9 DDoS incidents. Optimized AWS infrastructure, implementing database cold storage, EKS cluster sizing, and auto-scaling, reducing costs by 30%. Led migration from EC2 to EKS cluster, enabling seamless deployment and management of MongoDB, Apache Kafka, Redis, and 30+ microservices resulting in 30% infrastructure improvement. Engineered a microservice solution to manage 2 million TCP connections and IoT connections for the BOLT.EARTH product line, streamlining operational processes and enhancing scalability.

Revamped the architecture from monolithic to microservices using MERN stack to elevate scalability within the infrastructure by 75%. Strategically integrated Redis caching at authentication and authorization layers, resulting in a remarkable 6x reduction in HTTPS request call latency, thus optimizing system responsiveness.

Propelled the development of diverse client Software as a Service (SaaS) solutions specializing in Electric Vehicle (EV) inventory, sales, post-sales management, and EV fleet monitoring, deepening domain expertise. Initiated and led development efforts for company's portfolio of SaaS products from proof of concept to implementation.