Sonu Kumar — Full Stack Engineer

Senior Software Engineer with 3+ years of professional experience designing and building scalable, production-grade web applications for complex e-commerce and inventory management systems. Currently working at Wellness Extract, where I architect backend systems, optimize APIs, and mentor engineers to deliver reliable, high-performance products. I specialize in end-to-end system design — from backend architecture and real-time data synchronization to cloud deployment and CI/CD automation. 🚀 Core Expertise •Backend & Full-Stack •MERN Stack: React, Node.js, Express, MongoDB •REST & GraphQL APIs •Microservices & Event-Driven Architecture •Authentication, Authorization & Secure APIs E-Commerce & Integrations •Shopify APIs (Storefront, Admin, Plus, Headless) •Amazon SP-API •Payment gateways & order lifecycle management •Real-time Inventory Sync (Shopify ↔ Amazon) Cloud, DevOps & Architecture •AWS: EC2, RDS, Lambda, S3 •Docker & Containerization •CI/CD pipelines (GitHub Actions / Jenkins) •Scalable system & architecture design •Performance optimization & infrastructure cost control Databases •MongoDB & MySQL •Schema design, indexing & query optimization 💼 At Wellness Extract •Architecting and scaling production-grade backend systems •API performance optimization & reliability improvements •Designing clean, maintainable architectures •Leading code reviews & mentoring developers 🧠 Problem Solving & Engineering Mindset •600+ Data Structures & Algorithms problems solved on LeetCode •Strong command of Java for DSA •Built multiple production-grade web applications from scratch •Focus on clean code, scalability, and long-term maintainability 🌟 Background •2+ years of experience designing enterprise architectures at AlertEnterprise •100% client satisfaction across freelance projects •B.Tech in Computer Science – Chitkara University 🔗 Let’s connect to discuss MERN development, system architecture, cloud scalability, or e-commerce platforms.

Stackforce AI infers this person is a Backend-heavy Fullstack Engineer specializing in E-Commerce and Cloud Solutions.

Location: Delhi, India

Experience: 3 yrs 1 mo

Skills

Backend & Full-stack
Mern Stack
E-commerce
Frontend Development
Full-stack Development

Career Highlights

Architected scalable e-commerce platforms for global markets.
Expert in MERN stack with strong backend and frontend skills.
Proven track record of optimizing APIs for performance.

Work Experience

Wellness Extract

Full Stack Engineer (1 yr 11 mos)

ILEM JAPAN

Full Stack Engineer (5 mos)

Frontend Developer (10 mos)

Coding Ninjas

Mentor (3 mos)

Education

Bachelor of Technology - BTech at Bharat Institute of Technology

Data structures and algorithms in Java at Coding Ninjas

Full Stack Web Developer at Noble Work Foundation

Sonu Kumar

Full Stack Engineer

Delhi, India3 yrs 1 mo experience

Most Likely To Switch

Key Highlights

Architected scalable e-commerce platforms for global markets.
Expert in MERN stack with strong backend and frontend skills.
Proven track record of optimizing APIs for performance.

Stackforce AI infers this person is a Backend-heavy Fullstack Engineer specializing in E-Commerce and Cloud Solutions.

Contact

sksonu8544@gmail.com LinkedIn

Skills

Core Skills

Backend & Full-stackMern StackE-commerceFrontend DevelopmentFull-stack Development

Other Skills

AWSAlgorithmsAmazon Web Services (AWS)Babel.jsBack-End Web DevelopmentBootstrapCI/CDCSS3CloudComputer ScienceCreative Problem SolvingData StructuresDatabase Design & ManagementDatabase Management System (DBMS)DevOps & Deployment

About

Experience

3 yrs 1 mo

Total Experience

1 yr 7 mos

Average Tenure

1 yr 11 mos

Current Experience

Wellness extract

Full Stack Engineer

Jul 2024 – Present · 1 yr 11 mos · Delhi, India · On-site

Developed, architected, and delivered a global multi-market e-commerce platform across 25+ markets.
Built cloud-native, scalable systems capable of handling high traffic and peak loads.
Developed and maintained AWS infrastructure, Dockerized services, and CI/CD pipelines for reliable deployments.
Optimized APIs, databases, and caching to achieve 80%+ performance improvements.
Ensured high availability, security, and smooth global operations at scale.
Key Responsibilities:
Led end-to-end system architecture and development
Built scalable apps using Next.js, React, Node.js
Implemented multi-currency, multi-language commerce
Integrated Stripe, PayPal, Razorpay payment systems
Developed complete e-commerce features from scratch
Built IMS and multiple internal business dashboards
Designed PostgreSQL, MongoDB, Redis architectures
Optimized APIs and backend performance significantly
Implemented real-time features using WebSockets
Managed AWS, Docker, CI/CD, zero-downtime deployments
Impact:
Successfully scaled platform across 25+ global markets
Handled high concurrent traffic with stable performance
Reduced latency and improved load times significantly
Improved operational efficiency via internal platformsDev

AWSDockerCI/CDNext.jsReactNode.js+5

Ilem japan

2 roles

Full Stack Engineer

Promoted

Mar 2024 – Aug 2024 · 5 mos · Delhi, India · On-site

Spearheaded full-stack development for a multi-country beauty & wellness e-commerce platform, engineered to handle massive traffic spikes during IPL campaigns with brand ambassador Rasmika Mandanna. Designed scalable architecture with load balancing, horizontal and vertical scaling, and high-performance APIs, ensuring seamless, lightning-fast user experiences under peak load.

Load balancingHigh-performance APIsScalable architectureBackend & Full-StackE-Commerce

Frontend Developer

May 2023 – Mar 2024 · 10 mos · Delhi, India · On-site

Developed React.js, Next.js, Remix, and Tailwind CSS-based frontend applications for international e-commerce platforms in the beauty and wellness sector from scratch
Built multi-country (India, Japan, USA) and multi-currency e-commerce systems with full support for multiple languages, payment gateways, and regional customizations
Integrated and optimized REST APIs and GraphQL for seamless frontend-backend communication and dynamic user experiences
Ensured responsive, high-performance UI/UX, implementing modern frontend patterns, reusable components, and scalable architectures
Optimized site speed, SEO, and accessibility while maintaining clean, maintainable, and production-ready code
Collaborated with cross-functional teams, conducted code reviews, and mentored developers to maintain high-quality standards

React.jsNext.jsRemixTailwind CSSREST APIsGraphQL+2