Mridu Bhatnagar

• Built student marks batch upsert using Google Pub/Sub to process 70,000–80,000 weekly score record uploads in parallel, replacing sequential single-record API calls.
• Built an exam city preference module with validation, payment handling, and user flow improvements, serving 37,000+ students across 3 programs.
• Built JWT-based source verification using ES256 algorithm to enforce authenticated cross-app access for 40,000+ students, preventing direct course access without source verification.
• Refactored application form into a configurable, multi-institute product by removing hardcoded configurations and adding filterable form fields, launched for IIMU with 1,000+ students.
• Secured application credentials by migrating environment variables to Secret Manager and Parameter Manager across multiple projects, improving configuration consistency and reducing risk of secret exposure.

• Owned end-to-end development, maintenance, and documentation of the settlement service, serving 76,000+ unique customers.
• Drove settlement success rate to 100% by reducing merchant escalations to zero and coordinating with Razorpay and other dependent internal tech teams.
• Added Celery-based async processing to settlement service, handling peak loads of 8,000+ customers.
• Automated GST reporting and monthly invoice generation, reducing manual effort by 50%.

• Built a lightweight JSON-based custom CMS, replacing their WordPress setup and delivering ~50% improvement in webpage creation speed (measured via Google PageSpeed).
• Built a Query & Booking Management system using PHP and MySQL, reducing per-booking processing time by 75%, from ~1 hour to ~15 minutes per conversion.

• Built and maintained internal and external API integrations for partners including Criteo and WebEngage.
• Automated data pipelines to generate daily reports, reducing manual effort.

• Designed and implemented APIs and core business logic for the product's rule engine.
• Integrated multiple external fintech partner APIs for data exchange across workflows.

• Built backend features for Kredily using Django REST Framework.

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• Authored Python courses on LinkedIn Learning, covering practical backend development topics.
• Created API tutorial projects and short-form lessons for Twilio, published on their developer blog.
• Published bite-sized Python lessons on egghead.io.

• Spoke at PyData Delhi, EuroPython, and PyLadies meetups across multiple countries.