Sumit Kumar | Senior SDE & Tech Consultant

About Me

Passionate about bridging the gap between complex backend systems and intuitive user interfaces.

Software Development & DevOps Engineer with over 3.5 Years of Experience in the Payments and FinTech domain, specializing in POS Terminal Applications, EMV Kernel upgrades, and PCI-DSS aligned secure payment processing. I’ve contributed to Viking POS payment platforms for European PayTech leaders (Nexi / NETS) operating across 15+ countries.

My core technical stack spans C, C++, Python, and CI/CD automation using GitHub/Bitbucket and Jenkins. I focus heavily on system reliability, clean code practices, and structured problem-solving — ensuring scalable, certifiable, and compliant payment solutions.

I leverage GenAI tools such as GitHub Copilot to enhance engineering workflows — enabling faster prototyping and code refactoring.

Beyond product engineering, I’ve delivered 30+ freelance projects in web development and branding, working with 20+ satisfied clients. This experience strengthens my ability to translate business goals into technical solutions.

Work Experience

A track record of delivering secure, high-performance financial software.

Oct 2025 - Present

Senior Software Development Engineer

L&T Technology Services (LTTS) | Navi Mumbai

Leading development of POS Terminal Software for NEXI Group. Critical payment technologies and EMV certifications.

New Responsibility (Since Nov 2025): Leading iOS Framework Development for ECR applications, enabling seamless integration with Viking POS terminals.

Dec 2023 - Oct 2025

Software Developer

L&T Technology Services (LTTS) | Navi Mumbai

Specialized in C/C++/Python/YAML for Ingenico Tetra POS. Led PCI-DSS compliance, Kernel upgrades, and DevOps implementation.

Sept 2022 - Dec 2023

Associate Software Developer

L&T Technology Services (LTTS) | Navi Mumbai

Developed Viking POS Application System using C/C++ and Python for LTIMindtree | Nexi - NETS.

May 2022 - Sept 2022

Graphic Designer

ROKIT Games | Los Angeles (Remote)

UI/UX Design and Branding consultant using Adobe Creative Suite and XD.

Jan 2022 - Aug 2022

Associate Engineer (Trainee)

L&T Technology Services (LTTS) | Mysore

Internship focused on AWS, Data Visualization, and Web Development (Flask/Django).

July 2020 - Jan 2022

Freelance Software Developer

Self-Employed | Remote

Delivered 20+ websites and Azure/Google Workspace setups for educational institutions globally.

Nov 2020 - Dec 2021

Freelance Web Developer

YMEDY | Patna (Hybrid)

Built medicine delivery E-commerce platform (10k+ products) and managed digital marketing.

May 2020 - July 2020

Internshala Student Partner

Internshala | Remote

Campus ambassador focusing on marketing and networking strategies.

Technical Arsenal

Tools and technologies I use to build world-class products.

Payments & POS

EMV Kernels PCI-DSS Contactless Magstripe ISO 8583

AI-Native Engineering

AI Agents (Copilot, Antigravity) Zero-Code Development Model Integration (GPT-4, Claude, Gemini) Vision-Driven Development

Core Tech

C / C++ Python Objective-C iOS Frameworks JavaScript HTML5 / CSS3 SQL

DevOps & Cloud

GitHub Actions Docker AWS / Azure Jenkins CI/CD Pipelines

Tools & AI

VS Code PyCharm Xcode Jira / Confluence UL Brand Test Tool GitHub Copilot

Education

Academic background and qualifications.

B.Tech (Information Technology)

Lovely Professional University

2019 - 2022

Grade: 7.77 CGPA

Skills: Python, Software Development, Java, Branding & Identity, Data Science, Full-Stack Development.

Diploma in IT

Lovely Professional University

2016 - 2019

Grade: 9.31 CGPA

Activities: Graduation Project Expo, Chess, Cricket.
Secured 2nd Position in Graduation Project Expo for developing a scratch e-commerce web application.

Secondary Education (10th)

Central Board of Secondary Education

2012 - 2014

Grade: A+

Skills: Leadership

Key Academic Coursework

Data Structures & Algo (C/C++) Operating Systems Database Management (DBMS) Software Engineering Computer Networks & Security Cloud Computing Artificial Intelligence User Interface Design

Certifications & Training

Data Science & Big Data

• Big Data Fundamentals (Skillsoft)
• Intro to Data Science (Analytics Vidhya)
• Ace Data Science Interviews

Programming & Tech

• Python (Basic) - HackerRank
• C Theoretical Understanding (Sololearn)
• GitHub Copilot & Gen AI

Professional Skills

• Google Digital Marketing Fundamentals
• Business Analyst & Consultant (Aspiring Minds)
• Data Processing Specialist

Featured Projects

Innovative solutions across Full Stack, AI, and DevOps.

E-Commerce Web App

A complete multi-user platform with Prime membership & payment integration.

PHP / MySQL JavaScript Paytm Gateway

Product Review Analysis (AI)

AI system to categorize reviews (Good/Bad/Worst) for better decision making.

Artificial Intelligence NLP Python

NYC Taxi Prediction (ML)

Predictive modeling using EDA on New York City taxi trip datasets.

Machine Learning Data Visualization EDA

Freelance & Consulting

Delivered 30+ web & branding projects for startups/SMEs including school management systems.

WordPress Branding Digital Transformation

Auto-Install Launcher

Automated environment setup tool for Node.js & MySQL apps.

Shell Scripting Node.js

Honors & Awards

Recognition for technical excellence and leadership.

Consistent Performer

2022 - 2025 • L&T Technology Services

Achieved 'Exceeds Expectations' rating for 3 consecutive years, demonstrating sustained high performance.

SPOT Award

July 2025 • L&T Technology Services

Certificate of Appreciation for significant contributions and technical excellence in project delivery.

Star of the Month

Dec 2023 • L&T Technology Services

Recognized for Nets/Nexi POS Payment App Dev. Delivered critical features under tight deadlines.

Engineering Pradarshana

2024 • Mumbai

Certificate of Appreciation for showcasing innovative engineering solutions at the national expo.

Developer Conference

2024 • Google Firebase x Gemini AI

Selected attendee for Google's exclusive developer conference on Gen-AI and Cloud innovations.

Runner Up - Project Expo

Apr 2019 • Lovely Professional University

Secured 2nd position with cash prize for a scratch-built e-commerce web application.

Volunteering

Leadership roles and community involvement.

Class Representative

Lovely Professional University

Aug 2016 - Jul 2019

Vice School Captain

S.D.V. Public School

Apr 2014 - Mar 2016

House Captain

S.D.V. Public School

Apr 2012 - Mar 2014

English

Full Professional Proficiency

Hindi

Native / Bilingual Proficiency

Testimonials

What people say about working with me.

"Sumit has extraordinary work ethics. He can be trusted blindly. He delivers quality work."

AS

Dr. Abhishek Srivastav

Author & Motivational Speaker

"Sumit is not only good in study but in other curriculum activities also... his technical queries took him at this level now. Good luck Sumit."

PP

Parshotam Pal

Assistant Professor

"He is hard working techno lover and data retriever enthusiastic fork."

RS

Rohit Sharma

Analyst at eClerx

"Mr Sumit is knowledgable and highly skilled... It was pleasure working with him in last 3 projects. He possesses good skills in PHP, HTML, JS..."

JK

Javed Khan

Sr. UI/UX Engineer

Get In Touch

Open to new opportunities and collaborations.

sumit21adm@gmail.com +91 8727 86 4921

Expert in Payment Systems

Consistent Performer

Spot Award

Senior SDE

Google Gen-AI Conf

About Me

Work Experience

Senior Software Development Engineer

Software Developer

Associate Software Developer

Graphic Designer

Associate Engineer (Trainee)

Freelance Software Developer

Freelance Web Developer

Internshala Student Partner

Technical Arsenal

Payments & POS

AI-Native Engineering

Core Tech

DevOps & Cloud

Tools & AI

Education

B.Tech (Information Technology)

Diploma in IT

Secondary Education (10th)

Key Academic Coursework

Certifications & Training

Data Science & Big Data

Programming & Tech

Professional Skills

Featured Projects

E-Commerce Web App

Product Review Analysis (AI)

NYC Taxi Prediction (ML)

Freelance & Consulting

Auto-Install Launcher

Honors & Awards

Consistent Performer

SPOT Award

Star of the Month

Engineering Pradarshana

Developer Conference

Runner Up - Project Expo

Volunteering

Class Representative

Vice School Captain

House Captain

English

Hindi

Testimonials

Dr. Abhishek Srivastav

Parshotam Pal

Rohit Sharma

Javed Khan

Get In Touch

Expert in
Payment Systems