Siddharth Singh Resume

systems online · india

Senior Software Development Engineer @ Zeta · Backend · Payments · AI-native

Siddharth Singh

I design and ship distributed backends that move money correctly — authorization, settlement, and high-throughput services built for failure modes, not demos.

Inspect the work Start a thread

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Production systems

Current focus: resilient payment flows across Visa and Mastercard rails.

Zeta · 2024 — Present

Payments platform — healthcare & card transactions

Own end-to-end transaction lifecycle work across enterprise healthcare flows (Optum S3) and standard Visa/Mastercard private-network card transactions in a microservices, AWS-backed stack — from authorization through settlement and adjudication.

  • Led design and delivery of the S3 Connector for the complete enterprise healthcare payment lifecycle.
  • Shipped Legacy Connector settlement and Zeta Adjudicated Transaction flows for healthcare payers and standard card transaction paths.
  • Built capabilities including Balance Inquiry, Authorization Return, Virtual Card, idempotency, and tokenized transactions.
  • Drove incident RCA, zero-downtime releases, JDK migration for 7+ services, and PCI DSS / Snyk compliance across 10+ production services.
  • Mentored a team of 4 and partnered with Product, QA, Operations, and Customer Engineering on platform rollouts.

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Experience

Six years across FinTech and AdTech — from automation platforms to payment infrastructure.

  1. Aug 2026 — Present

    Senior Software Development Engineer

    Zeta · Mumbai

    Technical leadership on payment connectors, settlement, adjudication, and resilient high-throughput services.

  2. Dec 2024 — Aug 2026

    Software Development Engineer II

    Zeta · Mumbai

    Primary ownership of Optum S3 and private-network card flows; event pipelines, compliance, and team lead for 4 engineers.

  3. Jan 2024 — Dec 2024

    Senior Application Developer

    Media.net · Mumbai

    AI-driven creative automation and multi-DSP integrations in a distributed AdTech environment.

  4. Oct 2022 — Jan 2024

    Web Application Developer II

    Media.net · Mumbai

    Google Ads campaign launch tooling, keyword analytics, automated bidding; ~30% faster client onboarding.

  5. Sep 2020 — Oct 2022

    Digital Specialist Engineer → Specialist Programmer

    Infosys · Pune

    Python APIs, Jenkins + ServiceNow CI/CD, Kubernetes automation; ~26% efficiency gain for the automation team.

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Stack

What I use to design, ship, observe, and accelerate production systems.

Languages

Java, Python, JavaScript, PHP, Bash

Backend

Spring Boot, Node.js, Next.js, REST, microservices, system design

Data & messaging

PostgreSQL, Redis, SQL, Kafka, RabbitMQ

Cloud & ops

AWS, Docker, Kubernetes, Jenkins, Prometheus, Grafana, CI/CD

Domain

Payments, settlement, authorization, PCI DSS, FinTech, AdTech

AI-native workflow

Claude Code for agentic engineering, review loops, and faster delivery without lowering the bar

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Recognition

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About

Hey — I’m Siddharth, a Senior Software Development Engineer with 6+ years shipping backends that have to work when the graph gets ugly. B.Tech in Computer Science Engineering from UEM Kolkata (CGPA 9.15/10). I like bridging technical and non-technical rooms without losing the plot.

But I’m not all about code. I love to travel and explore new places, and I’m always up for an adventure — trying out exciting sports included. When I need to reset, I crank up the music or get creative in the kitchen. Being Indian, cricket is a big deal: watching games and debating plays with friends is half the fun. If you’re looking for a techie who’s also fun and down to earth, let’s chat.

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Interests

What I do when the pager is quiet.

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P99 Panic

Mini incident sim. Tap falling requests before they time out. Three misses and the pager owns you. Best score sticks in local storage — no cluster required.

served 0
best 0
misses 0 / 3
p99 —

sev-0 drill

Keep the cluster boring

Tap packets. Miss three and it’s an RCA night.

Desktop: click · Mobile: tap · Tip: AUTH and SETTLE are juicier points

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Let’s connect

Backend engineering, payments, distributed systems, or building AI-native delivery loops — happy to talk.

Email me LinkedIn GitHub Download resume