sjmfitto

Shipped core features for Golang based developer platform where one key feature was aimed at implementing a user queue for developers, reducing to and fro by 70%, improving testing efficiency for 100+ engineers. Tuned edge caching strategies (TTL rules, cache-key segmentation, and coalescing) and optimized traffic routing via Envoy/NGINX, with 35% reduction in cross-tenant latency and improved p95 response times during spikes. Led the transition from Github managed CI runners which cost $0.016/min to self hosted Github runners single-handedly which costs around $0.024 - $0.054 / hour resulting in a ~ 95.94% month on month savings. Rolled out LLM-driven test generation (GitHub Copilot + custom GPT) that auto-writes unit & property tests on each PR; coverage lifted 38 → 68 % and quarterly regressions dropped by one-third.

Fine tuned services, redefined HPA policies for lower environments, integrated spot VMs and created crons to scale down GKE node pools in non-business hours resulting in a month on month budget savings of 41%. Built robust DevSecOps pipelines with SAST, OS library scans, container vulnerability checks and DAST scans followed by a canary deployment strategy with Argo Rollouts on production environments. Scripted re-usable Terraform modules for workloads on GCP and AWS and integrated with terragrunt to manage terraform configurations for different environments with state locking preventing concurrent writes on state file.

Contributed in making microservices spin up in efficient time by creating multi-stage dockerfiles for various services which decreased the artifact size by 60% and fine tuned kubernetes resource requests and limits. Scripted Ansible playbooks fleet of EC2 instances and integrated those with Hashicorp Packer template.