Harleen Harnoor Chahal

S

CTO, Mosaic Finance - Go · low-latency systems · Elixir

Mosaic Finance
Noida, India · IST (UTC+5:30)
7+ years experience
University of Delhi
English, Hindi
Open to work
Messaging unavailable

Overview

Based in Noida. I lead real-time systems at Mosaic Finance. Moved 88% of real-time traffic off a legacy monolith without a customer-facing incident. Brought on-call pages for real-time down from 13 a week to 1. Before that: HCLTech and Freshworks. Most at home with WebSockets and Go. Board member at a local non-profit.

Good reasons to reach out
  • Roles in real-time systems
  • Working sessions on Elixir
Please don't message about
  • Requests to fix your code for free
  • SEO and link-building offers
Skills
ElixirRedisGoErlang/OTPWebSocketslow-latency systems
Open to workLooking for a role
closes in 3 months

Lead Software Engineer roles in edtech - Noida or remote

Target roles
Lead Software Engineer
Level
Senior
Industries
B2B SaaS, Fintech
Work mode
Hybrid
Available
30 days notice
Work authorization
Indian citizen
What I'm looking for
Hands-on work on low-latency systems with room to mentor.
Not interested in
Crypto

14 years in real-time systems. Strongest at Redis and Erlang/OTP. Open to the right conversation.

Noida, India · remote OKrediselixirerlang/otp
Open

Experience

  1. CTO
    Mar 2026 - Present
    Mosaic Finance · 7 mo · Full-time · Noida, India
    • Brought on-call pages for real-time down from 39 a week to 1.
    • Led the migration of 39 services to Go.
    • Moved 91% of real-time traffic off a legacy monolith without a customer-facing incident.
  2. Principal Engineer
    Jul 2024 - Mar 2026
    HCLTech · 1 yr 8 mo · Full-time · Noida, India
    • Backed 13 founders at pre-seed and seed.
    • Previously an operator for 8 years before investing.
  3. Principal Engineer
    Apr 2023 - Jul 2024
    Freshworks · 1 yr 3 mo · Full-time · Noida, India
    • Previously an operator for 5 years before investing.
    • Led or co-led 14 investments, 9 of them now at Series B or later.
  4. Software Engineer
    Nov 2021 - Apr 2023
    Google · 1 yr 5 mo · Full-time · Noida, India
    • Wrote the Go service that now handles 19 million requests a day.
    • Reduced cloud spend on real-time by 42% in two quarters.
  5. Senior Software Engineer
    May 2019 - Nov 2021
    InMobi · 2 yr 6 mo · Full-time · Noida, India
    • Moved 62% of real-time traffic off a legacy monolith without a customer-facing incident.
    • Shipped a rewrite that took build times from 22 minutes to under 4.

References

No references yet.

Education

  1. University of Delhi
    B.Com, Mathematics
    2008 - 2012

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