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4 followers · 5 following
  • Pune, India

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Achievement: Pull Sharkx4Achievement: QuickdrawAchievement: Pair Extraordinairex4Achievement: YOLO

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sagarsuperuser/README.md

I'm Sagar Waidande, a backend engineer in Pune, India. Eight years of backend engineering, mostly on systems that move money: trading platforms, payment APIs and billing. I've written Go professionally since 2021. Since 2025 I've been building open-source backend systems full time and load-testing them on AWS. Open to senior backend roles in Bengaluru or remote.

Go · PostgreSQL · AWS · Kubernetes · Terraform · Redis

Velox: open-source billing engine for AI products

Usage metering, pricing, invoicing, Stripe payments, failed-payment retries, credits and tax. Go, PostgreSQL and React. It is AI-assisted under a written review and testing process.

  • Correctness under failure: the billing leader was killed at five points mid-run, then four leaders raced the same run. No duplicate or lost invoices. With one database constraint removed as a control, the same test billed $2,575 against $1,000 owed.
  • Sustained throughput on AWS: 12,000 events/s at p99 22.6 ms on RDS Postgres, with every event reconciled.

notif-service: SMS platform on AWS

Go services on SQS and RDS Postgres, autoscaled on Kubernetes. 100,000 messages delivered in 293 s, reconciled against CloudWatch. Sends go to a provider simulator, not a live carrier.

Upstream

  • envoyproxy/ratelimit#1013, merged: a statistics test that never ran and asserted the wrong counts now runs and checks the right ones.
  • SigNoz#12668, open: at boot, the first organization with no alert rules stopped rule loading for every organization after it.

Smaller projects: leaky-bucket-gcra, a Redis-backed rate limiter for Go, and user-service, Google sign-in with PKCE.

sagar10018233@gmail.com · LinkedIn

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  1. getvelox/velox getvelox/velox Public

    Open-source, self-hosted billing for AI products: price tokens by model, sell prepaid credits, see margin per customer, and charge through Stripe without the Stripe Billing fee.

    Go 5 4

  2. notif-service notif-service Public

    Distributed SMS notification platform in Go on AWS — SQS, RDS Postgres behind RDS Proxy, KEDA autoscaling on k3s, Terraform. Load runs are gated on SQL invariants, and the campaign evidence is reco…

    Go 1

  3. leaky-bucket-gcra leaky-bucket-gcra Public

    Redis-backed rate limiter for Go using the Generic Cell Rate Algorithm — a single Lua script, so limits stay consistent across distributed processes.

    Go

  4. user-service user-service Public

    User authentication service in Go — Google OIDC sign-in (Authorization Code + PKCE, state-validated callback), JWT with pinned signing algorithm, hashed session tokens, bcrypt credentials.

    Go