Samiuddin Ahmed
Senior Software Engineer | Full-Stack, AI-native | FinTech, Payments, HR Tech
6+ years building production AI systems, enterprise payments, and compliance platforms at scale. Senior Software Engineer and Technical Lead shipping full-stack solutions across FinTech, Payments and HR Tech.
About Me
6+ years building full stack platforms across FinTech, Payments, and enterprise SaaS, from backend microservices and AI systems to cloud infrastructure and platform engineering. Former Tech Lead at Paycom, a $2B+ ARR platform serving 7M+ employees and 39,000+ companies. Deep expertise in Java, C#, PHP, Python, and Node.js, with production AI systems (LangGraph, RAG, LLMs) shipped at enterprise scale. Proven in enterprise SaaS and Payments delivery, architecture through production, high velocity incident resolution, and cross functional team leadership.
99.9% Uptime
Maintaining enterprise system reliability
75% SLA Improvement
Through automated testing & validation
36,000+ Companies
Secured with OWASP protocols
Experience
Paycom
US-listed enterprise HCM & payroll SaaS platform
- •Led and built Paycom's AI Assistant, LangGraph agent orchestration, RAG pipelines, and LLM integrations via LangChain, served through FastAPI, surfacing instant answers to multi step queries that would normally take navigating several pages, and letting users take direct action through embedded buttons, live in payroll, onboarding, and talent acquisition at scale
- •Resolved 100+ enterprise hotfixes in under 2 hours each, 75% faster than the 8 hour SLA, preventing duplicate payroll runs and directly preserving client retainers
- •Delivered 25+ client requested enhancements across Payments, Payroll, Talent Acquisition, and Self Onboarding using React, Node.js, and MongoDB, including AI native features, reducing manual HR overhead at enterprise scale
- •Won 1st place at the Paycom Hackathon, built a full stack tool (Spring Boot, PostgreSQL) with 20+ APIs in a weekend, shipped to production, saving 120+ business hours per year
- •Built a PII encryption platform deployed on AWS with Redis backed session caching as the compliance layer across Payroll and HCM, enabling PCI DSS and SOC 2 for 39,000+ clients and preventing fines in the millions
- •Shipped government mandated compliance rollouts for Mexico, Canada, and Germany in under 3 days each, coordinated via Kafka event streams and RabbitMQ workflows, non compliance would have meant payroll suspension for clients in those markets
- •Authored RCAs for incidents affecting 10,000+ users across Docker containerized, Kubernetes orchestrated services, systemic fixes reduced recurrence and became the team's standing reference for future production events
- •Led as Tech Lead, sprint planning, architecture, and mentoring 9 engineers on AI native tooling and LLM assisted workflows until they independently owned production
Technologies: Java, Python, C#, JavaScript, PHP, Laravel, SQL
University of North Texas
- •Built web apps and automation scripts for course infrastructure - assessment pipelines processing 2,000+ student submissions without manual intervention
- •Developed ML model implementations and data pipelines for Data Mining and ML curriculum, used in live coursework by 200+ graduate students
S&P Global Inc
- •Resolved 400 tickets in a single year at a 15-minute SLA on a platform where delayed data meant wrong trades for institutional clients. Awarded Rising Star of the Quarter
- •Built an automated audit dashboard replacing manual SLA tracking - saving 10 to 12 hours per week with real-time visibility for 4,000+ users
- •Refactored backend and optimized queries across 3 core data products – cutting delivery time by 87ms on market feeds where speed directly impacts trading decisions
- •Architected AWS Athena and OLAP reporting pipelines - enabling 4,000+ institutional clients to run unified cross-asset queries across equities, fixed income, credit, and derivatives
- •Created an internal training academy for new hires - replaced ad hoc knowledge transfer with a repeatable onboarding framework across the DMS team
Technologies: Java, C#, .NET, SQL, PostgreSQL, AWS
Skills & Expertise
Languages
Frontend
Backend
AI / LLM
Databases
Cloud & DevOps
Messaging
Security
Observability
Practices
Featured Projects
Core Banking POC
Sophisticated proof-of-concept banking system with two-service Spring Boot architecture (gateway + core), React UI, JWT authentication, SHA-256 PIN hashing, AES-256-GCM card encryption at rest, and role-based access control for secure transaction processing.
PTO Calculator
JavaScript-based application for calculating and managing paid time off (PTO), streamlining HR processes and employee time-off tracking with an intuitive user interface.
Weekly Tech Challenge Management Tool
Hackathon-winning application built in a single weekend featuring 20+ APIs, demonstrating rapid full-stack development capabilities.
Secure Data Encryption Platform
Enterprise-grade encryption system protecting sensitive PII data (SSN, DOB, addresses) for 36,000+ companies in HR applications.
Automated Audit Reporting System
Real-time dashboard generating hourly reports tracking open, acknowledged, and pending tickets for proactive SLA management.
Automated Training Academy
Self-learning course platform with videos, guides, and schedules for new hire onboarding, significantly reducing training time.
Education
M.S. in Computer Science
University of North Texas
B.E. in Information Technology
Osmania University
What I'm Looking For
Open to Opportunities
Seeking challenging opportunities where I can leverage my expertise in building production AI systems, enterprise payments infrastructure, and compliance platforms at scale. Passionate about shipping intelligent, real-world systems that replace manual processes and reduce overhead across millions of users. Committed to clean architecture, meaningful test coverage across unit, integration, smoke, and end-to-end, and security practices built in from the ground up.
Get In Touch
I'm always open to discussing new opportunities, interesting projects, or potential collaborations. Feel free to reach out!
GitHub
View my repositoriesLocation
Texas, USA | Hyderabad, India Open to relocate
Let's Work Together
Whether you have a project in mind, need technical expertise, or want to discuss opportunities, I'd love to hear from you.