Harisankar P S

Technical Lead | Ruby on Rails, PostgreSQL, Cloud Infrastructure

I build fast, reliable web applications and the infrastructure to run them. With 15+ years of professional experience shipping software, I specialize in Ruby on Rails architecture, PostgreSQL performance optimization, and cloud deployments on AWS.

Currently working as a Technical Lead, previously ran my own software consultancy. I also build and maintain open source tools.

What I Do

  • Backend Architecture – Ruby on Rails (through Rails 8.1), API design, background processing with Sidekiq. Upgraded hundreds of Rails applications from as far back as Rails 2.3 all the way to Rails 8.1
  • Database Engineering – PostgreSQL (read/write replication, high availability deployments, GIN indexes, query optimization), schema design
  • Cloud & DevOps – AWS (ECS/Fargate, RDS, EC2, S3), Docker, Terraform, Nginx, Linux server administration
  • Full-Stack Development – Next.js, React, Vue.js, Go
  • Infrastructure – Tailscale networking, self-hosted deployments, CI/CD pipelines

Conference Speaking

I’ve spoken at international conferences on topics like database-driven application performance and building resilient systems. Recordings of my talks are on the Videos page.

I also give trainings and workshops on Ruby on Rails for students and working professionals, and speak on open source, diversity in tech, and entrepreneurship.

Work Experience

I have been building web software since 2006 – starting with PHP (Joomla, Drupal, PHP-Fusion), moving into Ruby on Rails and modern full-stack development. Beyond Ruby, I have production experience in Go, Python, Crystal, Elixir, Java, and TypeScript.

Currently a Technical Lead, where I lead the development of a major application – driving architecture decisions, enforcing best practices, and ensuring code quality across the stack. Prior to this, I ran my own software development consultancy – working as a freelance architect, consultant, and product builder for clients across industries.

Get in Touch

Open to consulting, contract work, and interesting technical challenges.