Sagar Vasa

Software Engineer

Mumbai, Maharashtra, India9 yrs 7 mos experience

Most Likely To SwitchHighly Stable

Key Highlights

Expert in scalable system design and performance optimization.
Led major payment ecosystem enhancements at Upstox.
Proven track record in cross-functional collaboration and team mentorship.

Stackforce AI infers this person is a Fintech expert with a strong focus on scalable system architecture and payment solutions.

Contact

vasa.sagar08@gmail.com LinkedIn

Skills

Core Skills

Scalable System DesignPerformance & Cost Optimization

Other Skills

Amazon DynamoDBAmazon Web Services (AWS)AngularAngularJSApache KafkaAuthenticationAuthorizationAutomationBack-End Web DevelopmentBackend ServicesBootstrapBusiness Process ImprovementCSSCode DesignCode Review

About

I’m a Principal Software Engineer with 9+ years of experience in designing scalable, reliable, and cost-efficient systems. For the past 5+ years, I’ve been deeply involved in payments and FinTech, while I also have working experience across food tech and insurance domains. My Core Expertise: Scalable System Design – Architecting distributed systems that handle growth seamlessly. Performance & Cost Optimization – Reducing infrastructure costs while maintaining high efficiency. Event-Driven Architectures – Building real-time, fault-tolerant systems with Kafka, Redis, MySQL, and MongoDB. Leadership & Collaboration – Working across teams to ensure technical and business alignment. Security & Compliance – Designing secure and compliant financial systems. Over the years, I’ve taken on multiple roles beyond development, stepping in as a BA, PM, QA, and architect when needed. This adaptability has given me a holistic view of product development, helping me design systems that are not just technically sound but also aligned with business needs. I’m always open to connect with like-minded professionals, discussing new ideas, solving technical challenges, and collaborating on impactful projects. Let’s connect and talk if you think I will be able to help you in any way!

Experience

Upstox

3 roles

Principal Software Engineer

Promoted

Apr 2025 – Present · 11 mos · Mumbai, Maharashtra, India

Software Development Engineer 4

Promoted

Apr 2023 – Apr 2025 · 2 yrs · Mumbai, Maharashtra, India

I am responsible for the architecture, scalability, and reliability of the entire payments ecosystem at Upstox. This includes multiple payment verticles such as Payin, Payouts, Mutual Fund Payments (One-time), Stock SIP Payments, SGB, T-bills, NPS-related payments, Mandates, and more.
I have led the re-architecture of core payment components to enhance scalability, optimize costs, and improve fault tolerance. Designed and implemented a system capable of handling 10x peak load with minimal cost, ensuring resilience across multiple teams and business functions.
Extensive experience in integrating and optimizing payment flows with major gateways and aggregators, including HDFC, Razorpay, Cashfree, Atom, and Juspay. Architected an internal platform that streamlines vendor interactions, enhances observability, and reduces time-to-resolution for payment failures.
My focus areas include high-throughput system design, distributed architecture, latency optimization (P95/P99), and automation to improve operational efficiency. Additionally, I work on cross-functional initiatives related to revenue impact, cost savings, engineering excellence, platform stability, and customer success.
Beyond architecture, I drive stakeholder collaboration, team mentorship, and technical strategy, ensuring that payments infrastructure scales with Upstox’s growth while maintaining high availability and compliance.

Payments Ecosystem ArchitectureScalabilityReliabilityCost OptimizationFault TolerancePayment Gateway Integration+4

Senior Software Developer

Jun 2021 – Apr 2023 · 1 yr 10 mos · Mumbai, Maharashtra, India

Lead project development efforts and implement architectural changes in the payments system for scaling applications.
Integration with payment gateways & vendors - ICICI, HDFC, Razorpay, ATOM, and Cashfree for paying & payouts. Built monitoring and alerting around latency, P95, P99, and vendor errors.
Reduced TAT for payment processing by creating an internal system with automation facilities.
OKTA integration for internal systems to set organization-wide benchmarks.
Actively working on - Revenue, Cost saving, Engineering excellence, Tech Debt, Platform Stability & Customer success related KPIs & tasks (Confidential)
Also look after - Architecting, Stakeholder communication, 3rd Party Integration, Team Management & Mentorship

Payment Gateway IntegrationMonitoringLatency OptimizationStakeholder CommunicationTeam ManagementScalable System Design+1

Rebel foods (formerly faasos)

Software Development Engineer II

Nov 2019 – Jun 2021 · 1 yr 7 mos · Mumbai Area, India

Built IT Governance Control system to track changes being made to prices, discounts, commissions & inventories SOPs. This reliable system reduced overall manual error by 90% by accommodating bulk approval flow.
Designed and implemented Microservices for Rebel Marketplace (Phase 1) that register & onboards new vendors in the system. This application cut onboarding time by 60%.
Worked on notification services, and search functionality. Also for tracking payment performance, built a payment error logs system which tracks failed payments from Paytm, PhonePe, and Simpl.
Built Ovenstory Single click payment (Auto-Debit) system which has a success rate of ~94% compared to the existing ~75%. This has built a strong use case in terms of own platform orders improving by 15% on enabling linked wallet flows.

MicroservicesIT Governance ControlVendor OnboardingNotification ServicesScalable System DesignPerformance & Cost Optimization

M3bi

Software Developer

Oct 2018 – Nov 2019 · 1 yr 1 mo · Pune

Created a new platform to control the internal and external authentication and authorization at the coarse grain and fine grain level for customers, partners and colleagues.
Built user management, application management, authentication & authorization features using OKTA as auth provider

AuthenticationAuthorizationUser Management

Infosys

System Engineer

Aug 2016 – Oct 2018 · 2 yrs 2 mos · Pune, Maharashtra, India

Reduced the cost by at least 50% by developing a microsite for the clients of American funds. Implemented backend services in Spring boot to handle complex business logic & Developed frontend in Angular 4

Backend ServicesFrontend DevelopmentCost Reduction