Sagar Salal

CTO

Noida, Uttar Pradesh, India7 yrs 2 mos experience

Highly StableAI Enabled

Key Highlights

Led migration of UPI systems with zero downtime.
Architected cloud migration for high TPS payment systems.
Spearheaded AI agent development for fraud detection.

Stackforce AI infers this person is a Fintech backend architect with expertise in high-performance payment systems.

Contact

Skills

Core Skills

JavaSpring BootArtificial Intelligence (ai)AwsJava DevelopmentSap Hybris

Other Skills

AI AgentsActiveMQAlgorithmsAmazon Web Services (AWS)CC (Programming Language)C++Cascading Style Sheets (CSS)CassandraCucumberData StructuresElasticsearchEngineeringFinTechGCP

About

Technical lead with 7+ years of experience in building and scaling high-performance backend systems, currently serving as a Senior Technical Lead at Paytm. My expertise lies in designing distributed architectures, leading engineering teams, and delivering complex fintech solutions at scale. Over the years, I’ve driven multiple high-impact initiatives — from leading UPI platform development (collect, intent, mandate flows) to architecting cloud migration for 3500+ TPS payment systems. My work spans across Java, Spring Boot, Redis, Kafka, RabbitMQ, MySQL, MongoDB, and deep integrations with banks, wallets, and third-party processors. Notable contributions include: End-to-end migration from DC to AWS for real-time payment infrastructure. AOA/SuperRouter integration, a dynamic routing engine enabling seamless traffic flow across PGs and PAs. UPI migration from PPBL to Yes/Axis/HDFC, post-regulatory halt, ensuring zero downtime at 4000 TPS. Spearheading modernization efforts with Java 21 and Spring Boot 3.3.3, and developing AI agents for fraud detection. I bring a strong balance of technical acumen, architectural thinking, and stakeholder collaboration — consistently delivering reliable, scalable, and future-proof systems in a fast-paced, high-stakes environment.

Experience

Transunion

Lead Engineer

Oct 2025 – Present · 5 mos · India · Remote

JavaSpring BootPostgreSQLCassandraActiveMQGCP+2

Paytm

4 roles

Senior Technical Lead

Apr 2025 – Sep 2025 · 5 mos · Noida, Uttar Pradesh, India

Spearheading Java 8 to Java 21 migration along with Spring Boot 3.3.3 upgrade for enterprise-grade services.
Leading a team to build AI agents for fraud monitoring using real-time analytics and data pipelines.
Overseeing codebase modernization, performance optimization, and architectural refactoring.

Artificial Intelligence (AI)AI AgentsData StructuresFinTechAlgorithmsAmazon Web Services (AWS)+4

Technical Lead

Promoted

Apr 2023 – Mar 2025 · 1 yr 11 mos · Noida, Uttar Pradesh, India

Led migration from Jersey + Spring to Spring Boot, streamlining service development and maintenance.
Headed AOA/SuperRouter Integration, a routing platform for payment acquirers (PA/PG) similar to Juspay.
Managed full UPI migration from PPBL to acquiring banks (Yes Bank, Axis, HDFC) after RBI halt — system handled 4000+ TPS.
Collaborated directly with product, banking partners, and cross-functional teams for end-to-end delivery.

JavaRESTful WebServicesRedisRabbitMQkafkaSpring Framework+2

Senior Software Engineer

Promoted

Apr 2022 – Mar 2023 · 11 mos · Noida, Uttar Pradesh, India

Led the UPI module including collect, intent, and mandate flows.
Headed DC to AWS migration for a critical payment system (3500+ TPS), ensuring 100% uptime and full observability setup.
Migrated Netbanking, Card, UPI, Wallet, and other payment modes during cloud shift.

JavaRediskafkaAmazon Web Services (AWS)Spring BootMicroservices+1

Software Engineer

Apr 2021 – Mar 2022 · 11 mos · Noida, Uttar Pradesh, India

Worked on Subscription Module, closely interacting with Product and TPM teams for grooming and planning.
Involved in Netbanking and Card channel integrations across multiple banks and payment providers.

Java DevelopmentEngineering

Publicis sapient

3 roles

Associate Technology L2

Apr 2020 – Mar 2021 · 11 mos

Contributed to various projects at Medtronic, delivering multiple charters utilizing Hybris, Spring, and MySQL technologies.

SAP HybrisSpring BootMy Sql

Associate Technolgy

Jul 2018 – Mar 2020 · 1 yr 8 mos

Junior Associate

Jan 2018 – Jun 2018 · 5 mos

During my internship, I actively worked with technologies such as Spring Boot, MySQL, and MongoDB. I also had the privilege of contributing to real-world projects, including one at Bed Bath and Beyond.