Avi Kumar

Backend Engineer

Bengaluru, Karnataka, India4 yrs 4 mos experience

Most Likely To Switch

Key Highlights

Built scalable financial operations platform for major banks.
Migrated infrastructure, reducing costs by 30-40%.
Automated payment processes, enhancing user engagement.

Stackforce AI infers this person is a Backend Engineer specializing in Fintech and Consumer Tech with strong cloud and microservices expertise.

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Skills

Core Skills

Backend DevelopmentApi DevelopmentCloud MigrationMicroservicesSoftware Development

Other Skills

AWSAerospikeAgile MethodologiesAmazon DynamoDBAmazon SQSApache FlinkAutomationBackendBigTableBootstrapC++Cascading Style Sheets (CSS)CeleryContinuous Integration and Continuous Delivery (CI/CD)Dependency Injection

About

🔧 Backend Engineer (SDE-2) with 4+ years of experience designing and developing high-scalability, distributed systems across fintech and consumer tech domains. Passionate about building reliable, secure, and performant platforms that serve millions. - Currently at Osfin.ai, building a financial operations B2B platform for leading Indian banks — automating and optimizing large-scale payment processes across Cards, UPI, IMPS, and NEFT. Scaled ingestion pipelines to handle 40–50 crore+ daily records with 80× performance gains, implemented data encryption (TDE), Vault-based secret management, and RBAC for enterprise-grade security. - Previously built and scaled products like Koo (India’s Twitter alternative) serving 500K+ daily active users, and contributed to Josh Skills, an English-learning platform impacting millions of learners. - Skilled in Java, Kotlin, Python, Spring Boot, Kafka, Flink, SQL Loader, MySQL, Oracle, and GCP, with a strong grasp of system design, data security, and distributed architectures. - Always eager to solve complex engineering problems, learn emerging technologies, and contribute to scalable products that create real impact.

Experience

4 yrs 4 mos

Total Experience

1 yr 5 mos

Average Tenure

2 yrs 2 mos

Current Experience

Osfin.ai

SDE - 2

Apr 2024 – Present · 2 yrs 2 mos · Bengaluru, Karnataka, India · On-site

🚀 Building a next-gen Financial Operations Platform at Osfin.ai, empowering India’s leading banks to automate and optimize daily operations across Cards, UPI, IMPS, NEFT and other payment rails.
⚡ Scaled ingestion pipelines to handle 40–50 crore+ daily records, boosting performance by ~80× using advanced SQL Loader optimizations.
🔐 Implemented enterprise-grade security — full-stack encryption (TDE), HashiCorp Vault for secret management, and PII masking for PCI-DSS compliance.
🧩 Designed a modular API integration framework, enabling seamless onboarding of third-party financial services and scalable payment workflows.
🛡️ Strengthened system integrity with RBAC, SafeQueryBuilder, and secure SQL access control.
⚙️ Optimized CI/CD pipelines (Jenkins), reducing build execution time by 25+ minutes per run and improving developer velocity.
💳 Driving operational efficiency at scale, helping banks reconcile and process millions of transactions faster, safer, and smarter.

SQL LoaderTDERBACJenkinsBackend DevelopmentAPI Development

Koo

Software Developer

Feb 2023 – Apr 2024 · 1 yr 2 mos · Bengaluru, Karnataka, India · Hybrid

Infra Migration: AWS to GCP, worked on migrating DynamoDB to BigTable. Successfully transitioned network storage from ArangoDB to SQL Database, optimizing performance and ensuring data integrity. Migrated from SQS to Kafka and implemented Flink for enhanced real-time data processing. This helped to decrease Infra cost by approximately 30-40%.
Managed Network Service responsible for adding follow/unfollow relations handling 1200 RPM write and 100K RPM read load.
Migrated all relations data having over 3 billion rows from main db to network db using flink jobs
Worked on people recommendation micro-service for powering user recommendations across the App. This includes people feed & carousels across the feed.
Implemented User service to scale registration capacity to 1 million registrations per day, ensuring reliability.
Worked on various feed screens, including carousels across the app, premium users page, user-specific feeds (For You Tab), and News Tab, enhancing user engagement and experience.
Spearheaded development of API Gateway using Spring Boot(Kotlin), microservices with ktor, utilizing Apache Kafka and Apache Flink(Java) for real-time data processing, Aerospike, Redis, Dynamo DB, Big-Table, PostgreSQL as DB, Kubernetes, Docker for hosting
Added monitoring, alerts, and logging for the People & Network Service.

AWSGCPDynamoDBKafkaFlinkSpring Boot+3

Josh talks

Software Developer

Feb 2022 – Feb 2023 · 1 yr · Bengaluru, Karnataka, India

Worked with the D2P team and achieved the milestone of 1 Crore revenue per month.
Designed and Implemented AB Test logic from Scratch to test in-app features with a set of users.
Automated and Optimized Payments Completely. Both In-App and Manual Payments.
Migrated SQL to No-SQL DB for Analytics and Notifications.
Optimised APIs by adding cashing layers, reduced DB queries and added Rate-limiting for needed APIs
Experience with GCP/S3 - Managed Instance Groups, Staging servers and remained a part of the Development and Integration team.
Worked in the Notifications team and improved notifications delivery rate by 80-90%.
Created a leaderboard feature for users to track daily activity and it impacted significantly improved DAU by 30-40%.
Implemented Groups feature with group create, group call, and chat functionalities.
Created an in-house dashboard for Support Team and Sales Team.

SQLNo-SQLGCPDjangoSoftware DevelopmentAPI Development

Cognizant

Software Developer Internship

Jan 2022 – Feb 2022 · 1 mo · India · Remote

Worked on Incentive Management System and created required functional APIs for it.
Used frameworks, databases, and tools like SQLite, Django, Git, Docker, etc.

DjangoSQLiteGitDocker