Open to opportunities

Aarushi User

@aarushiuser

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Full-stack engineer with expertise in scalable application development.

India

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What I'm looking for

I am looking for opportunities that foster innovation, collaboration, and continuous learning.

I am a full-stack engineer with 3 years of experience in building scalable, high-performance applications. My expertise lies in using Java, Spring Boot, and AWS to design resilient APIs and automate cloud infrastructure with Terraform. I am passionate about writing clean code and ensuring production stability while continuously improving processes in fast-paced, agile environments.

In my current role at Visa Inc., I am responsible for migrating legacy payment gateway systems to a new architecture, significantly reducing settlement processing time. I collaborate with upstream services to ensure accurate transaction event ingestion and build scalable components for settlement file generation. Previously, at Fidelity Investments, I designed and built a secure serverless API on AWS that managed sensitive financial transactions, supporting 20k transactions per second.

My commitment to quality is evident in my development of comprehensive unit test suites that achieved over 90% coverage for multiple Java applications. I thrive on challenges and enjoy working closely with teams to resolve production issues swiftly, minimizing downtime and enhancing overall system reliability.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Visa Inc.

Apr 2025 - Present (2 months)

Migrated legacy payment gateway systems to a new architecture, reducing settlement processing time by transforming transaction data from Kafka streams into gateway-specific file formats. Collaborated with upstream services to ensure accurate ingestion of transaction events and built resilient, scalable components for settlement file generation and transmission.

Kafka Payment Gateways Systems Architecture Resilience

Full Stack Engineer

Fidelity Investments

Aug 2022 - Mar 2025 (2 years 7 months)

Designed and built secure, serverless API on AWS (Lambda, API Gateway, S3, KMS, IAM, Step Functions, Kinesis firehose) to manage sensitive financial transactions, supporting 20k TPS. Implemented the migration of over 140M records within 3 hours from DB2 mainframe to Oracle SQL using AWS Batch, JPA, Spring Batch, and Terraform. Developed a reconciliation application running every 30 minutes to repr

AWS Spring Boot Terraform JPA Oracle Unit Testing API Design EKS Java

Spring Intern

Fidelity Investments

Jan 2022 - Jun 2022 (5 months)

Developed a Python-based POC API designed to replace a vendor product, enabling decoded barcode values from a multipage file using pyzbar and xzing, and developed a user interface using Flask. Developed a Java desktop application using JavaFX that maintained records of different newspapers, customers, hawkers, and bills. Utilized the MVC design pattern approach for developing the GUI and used SQL

Python Flask Xzing Java FX Java SQL API Development

Education

Degrees, certifications, and relevant coursework

SRM Institute of Science and Technology

Bachelor of Technology, Computer Science and Engineering

Grade: CGPA - 9.6

Pursued a Bachelor of Technology in Computer Science and Engineering. Gained comprehensive knowledge in core computer science principles, including software development, algorithms, and data structures.