# Mansimar Kaur

> Senior Software Engineer, Data

Location: San Francisco, California, United States
Profile: https://flows.cv/mansimarkaur

## Work Experience
### Senior Software Engineer, Data @ Viseca
Jan 2025 – Jan 2026 | Zurich, Switzerland
Building high performance real-time data pipelines to process high-volume card transactions, supporting business operations, fraud detection, and ML-driven insights

### Software Engineer, Machine Learning @ TikTok
Jan 2022 – Jan 2023 | London, England, United Kingdom
- Developed and implemented advanced features based on user interaction data to enhance user tracking for high-impact recommendation models, driving significant growth and retention.
- Led A/B testing initiatives to improve publish rates, user growth, and re-engagement for target segments.
- Architected algorithms to refine 'For You Page' recommendations, resulting in marked improvements in user engagement and retention.

### Software Engineer, Machine Learning @ Booking.com
Jan 2019 – Jan 2021 | Amsterdam Area, Netherlands
- Architected and implemented a real-time monitoring solution using Flink to track Mean Scores and Feature Statuses for 400+ models.
- Enhanced the Argo workflow platform by enabling custom sensor arguments and integrating Spark scripts.
- Built a prediction drift monitoring system across 100+ models using Population Stability Index.
- Developed a robust system to monitor and track rolling performance metrics across varying levels of granularity for streamed data in near real-time.
- Engineered an advanced algorithm to monitor AUC in near real-time for streamed production data, leveraging reservoir sampling and probabilistic interpretation of AUC.

### Graduate Software Developer @ Booking.com
Jan 2018 – Jan 2019 | Amsterdam Area, Netherlands
- Spearheaded the design and implementation of a caching system using Cassandra for serving model predictions, including A/B experiments to evaluate performance improvements.
- Optimized memory usage by 50% for unmarshalling packed repeated variable-length integers in Gogoprotobuf library used across the company & in open-source projects like Kubernetes & etcd.

### Google Summer of Code 2017 with Homebrew @ Google
Jan 2017 – Jan 2017
Homebrew is a package manager for OSX.
- Led improvements to the test suite for Homebrew using RSpec
- Increased test coverage to 100% for critical components, including git, svn, and analytics utilities, ensuring comprehensive validation and reliability.
- Resolved technical debt and corrected faulty code, optimizing the overall quality and performance of the Brew package management system.

### Software Developer Intern @ HackerRank
Jan 2017 – Jan 2017 | Bengaluru Area, India
- Implemented advanced autocompletion features for Ruby and Swift, achieving latency reductions to 60 ms and 80 ms, respectively, significantly enhancing the user experience.
- Elevated test coverage for the code autocompletion service from 50% to 100% through comprehensive Mocha tests, ensuring robust and reliable functionality.
- Enhanced the distributed WebSocket and HTTP Load Testing Framework in Golang, contributing to more efficient and scalable load testing capabilities.
- Designed and integrated push notifications for community contest alerts, leading to first-place recognition at HackOn 2017.

### Software Developer Intern @ Mozilla
Jan 2016 – Jan 2017
- Selected for the round 13 of Outreachy as a Mozilla intern.
- Architected and developed a PubSub-based broadcast push service using Test Driven Development, enhancing real-time communication and data distribution.
- Released a REST API with Kinto.core on PyPi, facilitating easier integration and usage, and published technical articles on Medium and dev.to, contributing to community knowledge.
- Presented technical findings and innovations at major conferences, including FOSDEM (https://goo.gl/a72taF), Europython (https://goo.gl/5dxw4R), and PyCon India (https://goo.gl/gePcuX), showcasing contributions and thought leadership in the developer community.

### Lead Web Developer @ CLADO
Jan 2016 – Jan 2016
Clado, an online rental platform, was distinguished as one of the top 100 startups in the Startup Istanbul Program.
Key contributions included:
- Architected and integrated a comprehensive Promo Code system, advancing promotional functionalities and user engagement.
- Developed an automated email response module for inquiries, optimizing customer service efficiency and communication.
- Engineered robust sanitization and validation mechanisms for form entries, reinforcing data integrity and security across the platform.
- Refined and optimized the checkout experience by overhauling total calculation modules on the view cart and checkout pages.
- Redesigned and enhanced the navigation infrastructure, addressing and fixing broken links to improve overall site usability.


## Education
### Bachelor’s Degree in Computer Engineering
Netaji Subhas Institute of Technology

### High School
Mount Carmel School, Chandigarh


## Contact & Social
- LinkedIn: https://linkedin.com/in/mansimarkaur

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Source: https://flows.cv/mansimarkaur
JSON Resume: https://flows.cv/mansimarkaur/resume.json
Last updated: 2026-03-29