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Siddik M User

@siddikmuser

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Backend software engineer at Paygasus who brought card payments live and built a processor-agnostic API gateway.

India

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At Paygasus, I integrated Fiserv CommerceHub and passed certification across five card operations and 3DS, taking the platform live for card payments. I also built a merchant onboarding platform whose workflow automation cut onboarding time by about 35%.

I architected a processor-agnostic API gateway in Rust and implemented the payment engine’s identity layer. In my projects, I developed Aqlyn, an AI meeting-to-task app, and DocuChat, a document Q&A app using RAG.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Paygasus

Nov 2024 - Present (1 year 11 months)

Integrated Fiserv CommerceHub over REST APIs and passed certification across all 5 card operations and 3DS, taking the platform live for card payments. Engineered a multi-tenant merchant onboarding platform on Fastify, Next.js and Cloud Spanner with role-based access, cutting onboarding time by about 35%.

TypeScript NodeJS PostgreSQL Fastify Next.js Cloud Spanner Rust Keycloak JWT Docker GitHub Actions CI CD Vitest Supertest REST APIs 3DS Fiserv CommerceHub Merchant Onboarding KYC PCI Scope

Full-Stack Developer

Comtranse Technology

Jun 2024 - Nov 2024 (5 months)

Shipped 3+ production client applications, including vendor and medical-inventory dashboards and a React Native mobile app, using React, Node.js and Python.

React NodeJS Python React Native

Education

Degrees, certifications, and relevant coursework

Shivaji University

B.Tech, Computer Science and Engineering

2020 - 2024

Grade: 8.4/10

Activities and societies: Published as first author: 'Enhanced Contextual Recommendation in E-commerce with XDeepFM: Multi-Objective Optimization and Modeling Temporal Dynamics,' IJTE, Aug 2024. Led the three-person team that designed the algorithm.

B.Tech in Computer Science and Engineering from Shivaji University, Kolhapur, with a CGPA of 8.4/10. Published a research paper as first author.