Sachin Mittal

Hi, I'm Sachin πŸ‘‹

Senior Software Engineer with 5 years of experience building scalable backend services, AI-powered copilots, and deep integrations at Microsoft. Passionate about system design, performance optimization, and creating intuitive user experiences.

5,189 LinkedIn Followers

Experience

Feb 2024 β€” Current

Bangalore, India

Software Engineer 2 (L61), Employee Self-Service (ESS)

Microsoft

Contributed to the development of the ESS Copilot, an AI-powered assistant aimed at streamlining HR/IT processes. Delivered deterministic agent handoff routing queries to ISV/LoB agents via maker-configured rules with full context preservation and @mention support. Engineered .NET middle-tier service in Substrate Weve for wrapping multiple copilots under a single super agent. Built a configurable Agent Disclaimer system in Microsoft Admin Center and Copilot Studio.

Sep 2022 β€” Feb 2024

Bangalore, India

Software Engineer (L60), Viva Goals

Microsoft

Migrated & Optimized backend services from Ruby on Rails to C# .NET Microservices, reducing API latency and infrastructure costs substantially. Built deep integration with Microsoft Teams, driving a 2x increase in MAU. Enhanced collaboration by adding Goals sharing features like copy link and share on Teams channels. Developed scalable GraphQL Search APIs with orchestrator pattern, parallel asynchronous execution, achieving subsecond response times.

Nov 2021 β€” Sep 2022

Bangalore, India

Software Engineer (L59), Viva Goals

Microsoft

Architected Facebook Workplace integration for Viva Goals, building robust backend services in Ruby on Rails. Created AngularJS controllers, services, and real-time UI components. Automated testing with RSpec and Java (Selenium) with enhanced CI/CD pipelines.

Jun 2021 β€” Nov 2021

Chennai, India

Software Engineer

Ally.io

Designed and implemented the OKRs Sandbox feature. Migrated UI components from AngularJS to React. Implemented SCIM provisioning and SAML login for Okta and Azure Active Directory (AAD), provisioning 100k+ Microsoft employees to Ally.io.

Skills

JavaScript
TypeScript
C#
Ruby
C++
Python3
Java
React
Ruby on Rails
.NET
Node.js
Express
Generative AI
LLM
REST
GraphQL
Azure
Docker
Kubernetes
PostgreSQL
Redis
ORM
Messaging Queues
System Design
Microservices
Distributed Systems

Projects

Salary Insights Copilot

July 2025

Generative AI agent for salary insights. Built a robust backend using Go (API Gateway) and Python (LangChain RAG) with FastAPI, integrating real LeetCode data via GraphQL scraping. Designed clear API contracts for seamless Go-Python communication.

Go
Python
LangChain
FastAPI
GraphQL
Generative AI
RAG

Competitive Programming

Codeforces

@RedRanger
Current Rating1762
Max Rating1862 (Expert)
Problems Solved829

CodeChef

@redranger
Current Rating1947
Max Rating1947 (4β˜…)
Problems Solved64

CodeChef Rating History

LeetCode

@Bella_Ciao
Current Rating1697
Max Rating1697 (Top 13%)
Problems Solved566

LeetCode Rating History

Education

IIT(BHU) Varanasi, India

Bachelor of Technology

July 2017 β€” May 2021

GPA: 8.85/10.0

Achievements

  • Received two promotions within 3 years of joining Microsoft.
  • Secured Global rank within top 2K in Facebook Hacker Cup 2021, Earning a competition T-shirt.
  • Expert on Codeforces with a maximum rating of 1862 and 1000+ problems solved.
  • 4 star on Codechef with a maximum rating of 1994.

Let's Connect

Feel free to reach out for collaborations, opportunities, or just to say hi!