Software Engineer Senior

Sivakumar Vinayagam

• Indianapolis • 317-***-**** • ***********@*****.***

Skills

Architecture & Practices

System Design Microservice, Event- Driven, Microkernel Architectures Domain- Driven, Test-Driven Design Scalability & Distributed Systems Multi-tenant SaaS Planning & Delivery

Roadmap Planning CI/CD Pipelines Agile Cross-Functional Leadership Languages & Frameworks

C# .NET Core ASP.NET MVC MVVM EF Core JavaScript Web, API & UI

Razor Pages Blazor AngularJS React REST API Web API Databases

SQL Server MySQL DynamoDB MongoDB Redis

Cloud & Services

AWS (SNS, SQS, S3, OpenSearch) Azure (App Service, Functions, Logic Apps, Service Bus

DevOps & Infrastructure

TeamCity GitLab Bitbucket Docker API Gateway Testing & Performance

Unit Testing (xUnit, Moq/NSubstitute) Redis Caching & Query Optimization Summary

Results-driven Senior Software Engineer & Architect with 14 years of experience across Healthcare, Banking, Finance, E-Commerce, FinTech, SaaS, and Cloud-native applications. Proven expertise in architecting and scaling multi-tenant systems and designing and delivering resilient software apps. Leading system modernization initiatives. Excels in bridging engineering execution with business strategy, with a growing focus on AI-driven automation.

Education

• Master of Business Administration, Indiana University, Indianapolis Oct 2025

• Bachelor of Engineering, Electronics & Computer Science Jun 2009 Sivakumar Vinayagam

• Indianapolis • 317-***-**** • ***********@*****.*** Professional Experience

Netmasons Inc. (FinTech Startup), Anderson, Indiana May 2019 – Present System Architect

In my day-to-day, I spend about 70% of my time coding and developing and the rest on architecting, designing, onboarding, debugging, team communication, and cross- functional collaboration. I have led the design and deployment of scalable multi-tenant SaaS infrastructure, enabling growth from hundreds to thousands of clients. I architected and implemented systems like B2B APIs, web pages, secure 3 rd

party API

integrations with advanced fraud detection in payments, streamlining transactions and boosting conversion rates. I also modernized legacy systems into microservices-based architectures, driving high availability, performance, and faster feature delivery. Key Results:

• Wore multiple hats in a startup environment. Managed customer requests, provided support, collaborated with B2B partners and cross-functional teams, and worked as a dedicated backend engineer for core SaaS products.

• Built a centralized gift card platform for hospitality groups, integrating with multiple POS systems for real-time transaction, issuance, redemption, and reconciliation.

• Operating in a dynamic startup environment, balancing responsibilities across customer support, partner collaboration, and backend engineering to deliver mission-critical SaaS products.

• Design and build a centralized gift card platform for hospitality groups, integrating with multiple POS systems to support real-time issuance, redemption, and reconciliation.

• Instrumental software engineering, driving the company growth from 200 to 6,000 clients, contributing to multi-fold revenue expansion. Developed a SaaS e- commerce gift card platform, enabling merchants to offer digital gift cards, to increase revenue and customer retention.

• Direct cross-functional initiatives across product, engineering, and business teams, delivering high-impact programs in fast-paced environments with minimal oversight.

• Implemented advanced payment solutions, including Stripe, Apple Pay, and AWS Serverless integrations, enhancing transaction security and boosting sales.

• Experimenting and developing AI Agentic checkout and cart managements using emerging AI concepts.

Sivakumar Vinayagam

• Indianapolis • 317-***-**** • ***********@*****.*** Sallie Mae Bank, Indianapolis Dec 2013 – May 2019

Software Engineer

Design and optimize lender configurations and the bank’s interest rate management system. Lead the decomposition of a legacy monolithic application into microservices, enabling scalability, performance improvements, and the delivery of advanced loan pricing features.

Key Results:

• Developed and maintained the core logic for a multi-lender interest rate management system, ensuring high accuracy, performance, and compliance across diverse financial products.

• Lead the decomposition of legacy monolithic applications into microservices, enabling scalability, resilience, and faster deployment cycles while supporting advanced loan pricing features.

• Collaborated with cross-functional teams (product, engineering, compliance, and business stakeholders) to define requirements, align system design with business goals, and deliver accurate API data to downstream systems.

• Integrated and negotiated with upstream data providers, securing critical financial data feeds and implementing validation pipelines to guarantee reliability and regulatory compliance.

• Designed and developed web platforms for schools and students, enabling secure, user-friendly portals for submitting and managing education loan applications via interactive dashboards.

• Contributed to Agile ceremonies (sprint grooming, backlog refinement, PI planning), helping prioritize work, mitigate risks, and align quarterly initiatives with enterprise strategy.

• Championed in best practices in system design, code quality, and API governance, ensuring maintainable solutions aligned with enterprise architecture standards.

Exela Technologies, Texas April 2011 – Nov 2012

Programmer Analyst

Started my career as a key team member, I contributed throughout the full software development lifecycle of a healthcare web application. My role involved implementing new features, managing bug fixes, writing database procedures, monitoring systems to ensure seamless systems up time. I also provided direct production support by resolving technical queries and implementing functionality enhancements based on change requests.

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