Ayush Mittal

Director of Engineering

Tokyo, Tokyo, Japan10 yrs 6 mos experience

Highly Stable

Key Highlights

Expert in leading engineering teams for scalable solutions.
Proven track record in architecting high-availability systems.
Strong background in financial services and payment systems.

Stackforce AI infers this person is a Fintech expert with strong capabilities in scalable payment systems and engineering management.

Contact

ayushmittal1993@gmail.com LinkedIn

Skills

Core Skills

Engineering ManagementCross-team CollaborationSystem ArchitecturePerformance OptimizationSystem DesignTransaction ManagementMicroservices ManagementPerformance DesignUser System ScalingIntegration ManagementUser ManagementApi Reliability

Other Skills

AlgorithmsCC++Core JavaDBMSData StructuresElasticSearchEvent ManagementHTMLJ2EE Web ServicesJavaLinuxMicrosoft ExcelMySQLOAuth2 Implementation

About

Helping a new world to go cashless.

Experience

10 yrs 6 mos

Total Experience

4 yrs 6 mos

Average Tenure

1 yr 4 mos

Current Experience

Paypay india

2 roles

Senior Engineering Manager

Promoted

Jul 2025 – Present · 11 mos · Gurugram, Haryana, India

Leading engineering teams across Financial Services, Merchant Services, and Quality Assurance, focused on delivering scalable, high-availability solutions to support PayPay Group’s strategic growth.
Driving cross-team collaboration, dependency management, and proactive risk mitigation to ensure alignment with Japan HQ’s high-priority initiatives.
Mentoring and managing Engineering Managers to build a high-performing organization.
Focused on long-term strategic growth, talent retention, and improving engineering processes for sustainable impact.

Engineering ManagementCross-team CollaborationRisk Mitigation

Principal Engineer - Financial Department

Jan 2025 – Jun 2025 · 5 mos · Gurugram, Haryana, India

Led end-to-end delivery of large-scale financial and merchant service projects, ensuring performance, scalability, and security for millions of users.
Architected and implemented high-availability systems supporting P2P payments, merchant onboarding, transaction settlement, and compliance features.

System ArchitecturePerformance OptimizationScalability

Paypay corporation

3 roles

Principal Engineer - Financial Department

Promoted

Apr 2023 – Dec 2024 · 1 yr 8 mos

Led end-to-end delivery of large-scale financial and merchant service projects, ensuring performance, scalability, and security for millions of users.
Architected and implemented high-availability systems supporting P2P payments, merchant onboarding, transaction settlement, and compliance features.

System ArchitecturePerformance OptimizationScalability

Technical Lead — Fund Processing System

Apr 2022 – Mar 2023 · 11 mos

Leading the Fund System, the backbone service handling top-ups, P2P money transfers, merchant settlements, and gift features, ensuring seamless flow of billions of transactions.
Designed and implemented scalable architecture to handle rapid growth in transaction volume with high reliability.

System DesignTransaction ManagementScalability

Senior Software Engineer - Payments Platform

Feb 2019 – Mar 2022 · 3 yrs 1 mo

Managing the payment microservices that handle billion txns per month.
Multiple system migrations on new technologies to prepare for new limits.
System performances and features designing.

Microservices ManagementSystem MigrationPerformance Design

Paytm

2 roles

Senior Software Engineer - User Platform

Promoted

Apr 2017 – Jan 2019 · 1 yr 9 mos · Noida, Uttar Pradesh, India

Led initiatives to scale authentication and user systems as Paytm’s customer and merchant base grew exponentially.
Drove the migration and integration with Alipay systems, aligning Paytm’s user authentication and identity services with Ant Financial’s ecosystem.
Designed solutions for cross-border account access and compliance, ensuring smooth operation under new integrations.
Mentored junior engineers, conducted reviews, and contributed to best practices for security and scalability in the platform.

User System ScalingIntegration ManagementSecurity Best Practices

Software Engineer - User Platform

Jun 2015 – Mar 2017 · 1 yr 9 mos · Noida, Uttar Pradesh, India

Contributed to building the User Platform, enabling secure authentication and user management across Paytm services.
Implemented OAuth2-based authentication flows for users, merchants, and internal services.
Delivered core features of user profile management, handling onboarding, KYC data, and account updates.
Improved API reliability and latency, ensuring seamless login and identity verification for millions of daily active users.

User ManagementAPI ReliabilityOAuth2 Implementation