Shrine Sabu

Backend Engineer

Bengaluru, Karnataka, India4 yrs 8 mos experience

Key Highlights

Designed scalable APIs for digital payments.
Achieved 1.8M+ downloads for Android apps.
Integrated multiple APIs for enhanced user experience.

Stackforce AI infers this person is a Backend Engineer specializing in Fintech and Mobile App Development.

Contact

shrine02sabu@protonmail.com LinkedIn

Skills

Core Skills

Backend DevelopmentApi DevelopmentTestingMobile Development

Other Skills

API IntegrationAWSAWS S3AdMobAdobe XDAgile MethodologiesAmazon CloudWatchAmazon ECSAndroid DevelopmentAndroid StudioArduino IDEBeautiful SoupCI/CD AutomationCeleryCore Java

About

As a Backend Engineer with over two years of hands-on experience, I specialize in building scalable, secure, and high-performance APIs using Django, Celery, Redis, and AWS. At EximPe, I’ve designed and optimized backend systems that power digital payments and international remittances— enabling smooth onboarding for thousands of merchants. I focus on solving complex engineering problems through clean architecture, asynchronous processing, and database optimization. My work includes integrating Surepass and Cashfree APIs for automated KYC and virtual account creation, implementing AES-GCM encryption for PCI DSS compliance, and migrating sensitive data to vaulted fields for enhanced security. I’ve also contributed to CI/CD automation with GitHub Actions and ECS. I’ve developed caching strategies, resolved N+1 queries, and load-tested APIs to scale for over 250 concurrent users under 300 ms latency. I actively collaborate with cross-functional teams to deliver backend solutions that enhance customer experience and streamline business operations. I started my journey by independently designing, developing, and scaling Android apps during college—one of which was acquired by a Delhi-based startup. My apps grew organically to 1.8M+ downloads and 100K+ monthly active users, monetized through AdMob and Google In-App Purchases. Passionate about precision, scalability, and security, I continuously learn, refine, and build impactful backend architectures that balance performance with real-world business value. GitHub: https://github.com/shrine2000 Stack overflow: https://stackoverflow.com/users/9846650/mad-lad

Experience

Eximpe

2 roles

Backend Engineer

Nov 2023 – Present · 2 yrs 4 mos

Integrated and optimized Surepass KYC APIs with retries and mock environments, reducing customer onboarding time by 7–10 minutes and cutting QA/demo friction and API downtime failures.
Implemented Fyno to enable multi-channel user communication via email, WhatsApp, and SMS, improving delivery reliability and reducing engineering effort by ~80%.
Resolved major and minor bugs, improving customer experiences and software stability.
Migrated Mixpanel events to backend, improving funnel accuracy and reducing tracking bugs by 80%.
Built secure decryption tools for production API requests, reducing debugging time by 50% while ensuring audit compliance.
Added audit logging for 10+ key workflows, boosting traceability and reducing incident RCA time by 60%.
Built and documented robust 3rd-party merchant onboarding APIs for global collections (export PA-CB), secured via IP whitelisting and custom auth headers, enabling seamless external integrations.
Scraped and enriched 100K+ company and trade records using Playwright, BeautifulSoup, and APIs; hosted on Google Compute Engine to support sales, autofill product data, and scale lead generation efforts.
Replaced existing FX rate provider after a 2-week technical and pricing analysis, achieving ~73% cost reduction by integrating a more efficient API solution.
Used AWS Textract, OpenAI, and S3 to extract ~35K company contacts from scanned docs.
Integrated Cashfree APIs & Webhooks to enable global collections (export PA-CB), driving ~$50,000 in total transaction volume within the first 6 months of launch.
Integrated Facebook Conversion API to optimize Meta ad tracking and improve ad ROI.
Refactored error monitoring and optimized Sentry alerts, refining messages and filtering noise to reduce false alerts by ~70% and improve production debugging efficiency.

DjangoCeleryRedisAWSAPI IntegrationDatabase Optimization+4

Backend Engineer Intern

Aug 2023 – Oct 2023 · 2 mos

Migrated legacy unit tests to pytest, improving test maintainability, leading to faster CI cycles.
Optimized Django API endpoints, achieving up to 30% improvement in response times and reducing database query overhead by ~25%.
Managed static/media content on AWS S3 and integrated presigned URLs into the codebase, improving content delivery reliability.
Conducted comprehensive codebase refactor to eliminate ~15% of unused fields and dead code, streamlining models and improving readability.
Implemented SonarQube for automated code quality checks, fixing 100+ issues and reducing critical/security bugs by ~85%.

pytestDjangoAWS S3SonarQubeBackend DevelopmentTesting

Self-employed

Android Developer

Jan 2019 – May 2021 · 2 yrs 4 mos

Developed and published 4 Android apps on Google Play Store with a total of 1.8M+ downloads and an average rating of 4.6+ stars.
One app was acquired by a startup; it alone reached 1.5M+ installs and peaked at 100K+ daily active users (DAUs).
Achieved peak single-day download volume of 19K+ across apps.
Monetized apps using AdMob and Facebook Audience Network with interstitial, native, and banner ads.
Integrated Google Play Billing API to enable premium feature unlocking via in-app purchases.
Used Adobe XD for designing UI mockups, app store visuals, and marketing creatives.
Performed data-driven ASO with tools like App Annie, AppBrain, Sensor Tower, and A/B testing.
Built and deployed a custom Node.js-based scraper to track keyword ranking by country; scheduled as cron jobs for automation.
Used targeted email and social media campaigns to boost organic installs.
Tech stack: Android Studio, IntelliJ, Kotlin, XML, SVG, Gradle, Git, JUnit, Firebase, Crashlytics, Flurry Analytics, AdMob, Google Billing.