# Prasannakumar B Vardi

> Senior Software Developer

Location: Santa Clara, California, United States
Profile: https://flows.cv/prasannakumar

I’m a Software Engineer with 9+ years of experience building scalable backend systems, microservices, and data platforms across Cardlytics and Yahoo. I specialize in transforming complex architectures into reliable, high-performance solutions using Go, Python, Java, .NET, and AWS.

At Cardlytics, I’ve designed and shipped APIs and data pipelines that improved targeting precision by 30%, automated large-scale S3-to-Vertica workflows, and unified CI/CD pipelines across 40+ repositories. My focus is on delivering systems that are secure, efficient, and simple to operate at scale.

I’m passionate about distributed systems, cloud engineering, and data-driven products — and I thrive in environments where collaboration, innovation, and impact intersect.

## Work Experience
### Software Developer @ Cardlytics
Jan 2022 – Present | Palo Alto, California, United States
▪Targeting & Audience Services:
               o Designed and led development of a Zip Radius Expansion service using AWS Glue, PostgreSQL, and microservices architecture, improving audience targeting precision and reducing query latency by 30%.
       o Built and productionized the Overlap API and enhanced Share of Wallet with dynamic criteria rules, automated validation, and max-trip logic—boosting targeting accuracy and operational efficiency across multiple campaigns.
       o Delivered traffic-splitter logic and led end-to-end testing for the UK platform launch, ensuring a 100% successful rollout of new targeting capabilities across regions.

▪Connections & Integrations:
      o Owned and modernized the Connections pipeline, automating S3-to-Vertica data transfers and improving analyst workflow efficiency by 40% through reliable, scalable integrations.
      o Migrated Connections and TVC components to new Salesforce instance and spend feed table, deprecating legacy systems.

▪ Platform Engineering & CI/CD: Migrated 38 repos from Stash/TeamCity/Octopus to GitHub Actions, unifying CI/CD and improving deployment speed and reliability by 40%.
▪Monitoring, Security & Operations: Developed Datadog metrics, monitors, and events for Merchant Segments and core features.
▪Upgraded C# repos from .NET 5 to .NET 6, improving system reliability and maintainability.
▪Led Security Hub issue triage and remediation across 45+ repos and AWS resources.
▪Automated quarterly CAS tasks for user access reviews, patching, and backups, reducing manual effort.
▪Guard railed deployments to ensure secure, controlled, and efficient releases.
▪Upgraded EKS & Rancher infrastructure (≥2.0.9), maintaining patching, backups, and UAR compliance for targeting components.

### Software Developer @ Yahoo! Inc.
Jan 2017 – Jan 2022 | United States
▪ Delivered ConnectId solution, enabling advertisers to buy, measure, and optimize ads while helping publishers manage and monetize
audiences without third-party cookies.
▪ Designed and implemented end-to-end ad tools, including a simulation of the ad request flow and SKAdNetwork changes to capture
click and view attribution, collaborating across Apps/SDK, Targeting, and Reporting teams.
▪ Developed consumer-facing web and mobile products in a fast-paced Agile environment, including backend systems for campaign
creation, management, and real-time alerts in Gemini-Shopify and Gemini iOS applications.
▪ Built Metroplex application, crawling iTunes and Google Play to fetch, normalize, and deliver app metadata for online and offline use.
▪ Boosted mobile engagement by implementing universal links and backend alert systems with RESTful APIs for billing and budget notifications.

### Back End Developer @ Filtrest
Jan 2016 – Jan 2016
• Developed backend system to fetch articles from various social networks based on user’s interest using Python and Django framework.
• Designed an algorithm to score the Web articles, Facebook and Twitter feeds based on relevance and popularity. Organized them based on the score assigned. (Django)

### Teaching Assistant @ Stony Brook University
Jan 2016 – Jan 2016 | Stony Brook University, Stony Brook
• Designed projects on Algorithms and Data Structures for a course of 60 undergraduate students.
• Assisted Professor with classroom instruction, exams, record keeping and other miscellaneous projects.

### Software Engineer @ Infosys
Jan 2013 – Jan 2015
• Development and testing of MCS web application for online account opening in Royal Bank of Scotland.
• Built a Backend system to fetch, verify and update customer details from database.
• Implemented Knowledge Management Activities and Induction Program to assist new employees.


## Education
### Master's degree in Computer Engineering
Stony Brook University

### Bachelor of Engineering (B.E.) in Electronics and commmunications
MSRIT


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

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Source: https://flows.cv/prasannakumar
JSON Resume: https://flows.cv/prasannakumar/resume.json
Last updated: 2026-04-11