Checkout reliability
Idempotent webhooks + gateway failover patterns for high-volume campaigns.
Senior Backend Engineer
Building Scalable Web Solutions That Drive Business
Senior Backend Engineer with 6+ years building SaaS, CRM, checkout, and eCommerce platforms using Laravel, Node.js, and cloud-native infrastructure.
6+
Years Experience
6
Featured Projects
40+
APIs Delivered
12+
Payment Integrations
99.9%
Uptime Targets Met
Tech I work with
- Laravel
- PHP
- Node.js
- Vue.js
- Next.js
- MySQL
- Redis
- Docker
- AWS
Platforms & environments I deliver on
- Shopify stacks
- BigCommerce
- WordPress commerce
- AWS workloads
- GCP Cloud Run
- Docker fleets
Highlights
Signature strengths
Retail dual-session ops
Daily/evening sales models with settlement-safe billing and fast counter UX.
Platform integrations
Shopify, WordPress, BigCommerce adapters with Redis-aware rate limiting.
Delivery culture
Dockerized stacks, GitHub Actions CI/CD, mentoring, and structured code reviews.
Process
How I ship backend systems
01
Discover
Map business rules, failure modes, and the metrics that actually matter.
02
Design
API contracts, data model, queues/cache boundaries, and rollout plan.
03
Build
Ship iterative slices with tests on money/stock paths and observable logs.
04
Harden
Load-aware limits, idempotency, CI/CD, and production support playbooks.
About Me
Passionate about reliable backend systems
Senior Backend Engineer with 6+ years of experience designing, developing, and maintaining scalable backend systems using PHP, Laravel, Node.js, and RESTful APIs. Experienced in SaaS, CRM, inventory management, checkout, and eCommerce platforms with expertise in MySQL, Redis, RabbitMQ, Docker, and cloud deployments on AWS and GCP. Strong background in API architecture, database optimization, payment gateway integration, CI/CD automation, and production support. Passionate about building maintainable software, improving application performance, and mentoring engineering teams.
- Name
- Deep Biswas
- Experience
- 6+ Years
- Location
- Kolkata, India
- biswasd94@gmail.com
- Availability
- Open to opportunities
- Languages
- English, Hindi, Bengali
Experience
Career timeline
June 2021 – June 2026
Senior Engineer, Web
Codeclouds IT Solutions Pvt. Ltd. · Kolkata
- Owned backend delivery for SaaS, CRM, and checkout products across eCommerce clients.
- Built scalable REST APIs for checkout, orders, CRM, inventory, and workflows (Laravel, Symfony, Node.js, MySQL).
- Integrated Sticky.io, Konnektive, and CheckoutChamp across Shopify, WordPress, and BigCommerce.
- Deployed on AWS/GCP with Docker and CI/CD; migrated Symfony apps to PHP 8.3+ and mentored the team.
January 2021 – September 2021
Web Developer
S M Solutions
- Developed Laravel REST APIs and third-party integrations.
- Enhanced frontend components and shipped incremental improvements.
January 2020 – November 2020
Web Developer
Sleek Infosolutions Pvt. Ltd.
- Built CodeIgniter apps and Laravel REST APIs for client projects.
- Delivered features, bug fixes, and ongoing maintenance.
January 2017 – April 2017
Web Developer
Vrisini Infotech LLP
- Developed TYPO3 CMS applications and reusable frontend templates.
What I Do
Services & focus areas
Backend Development
Scalable PHP/Laravel and Node.js systems with clean architecture and SOLID practices.
API Design & Integration
RESTful APIs, payment gateways, and third-party platform integrations.
Database Design
MySQL schema design, indexing, transactions, and query optimization.
Performance Optimization
Caching with Redis, profiling, and backend performance improvements.
Cloud & DevOps
AWS, GCP, Docker, CI/CD pipelines, and reliable production deployments.
Mentorship & Reviews
Code reviews, mentoring, and raising engineering standards across teams.
Portfolio
Featured Projects
Selected work across retail backends, sales fronts, and inventory platforms — with live demos and case studies.
Web ApplicationMSTORE
Sales & billing platform
Retail operations dashboard for daily sales, orders, payments, customers, products, and company settings.
Vue.jsTypeScriptLaravelMySQL- Active modules
- 11+
- Export formats
- CSV / PDF
- Sessions
- Daily + Evening
SaaSAINVENT
Inventory & distributor management
Distributor platform for beats, inventory, invoicing, shipments, returns, payments, and reporting.
LaravelMySQLBladeBootstrap- Beats tracked
- 13+
- Ops modules
- 16
- Core flows
- Invoice + Stock
SaaSMBizInvent
Invoice & inventory management
Business inventory system for customers, products, stock history, invoices, and operational settings.
LaravelMySQLAdminLTE- Admin modules
- 8
- KPI widgets
- 4
- Focus
- Invoicing
E-commerceCheckoutHub
High-volume checkout orchestration
Mock eCommerce checkout control plane for subscription offers, upsells, and gateway failover across Shopify and BigCommerce storefronts.
Node.jsLaravelRedisMySQL- Gateways
- 3+
- Peak RPS (mock)
- 1.2k
- Failover
- < 2s
SaaSCRM Flow
Lead-to-order CRM pipelines
Mock CRM workspace for lead intake, agent queues, notes, and order handoff into checkout and fulfillment systems.
LaravelVue.jsMySQLRedis- Pipeline stages
- 7
- Sync lag (mock)
- < 5s
- Queues
- Priority + SLA
APIShopSync API
Commerce platform integration API
Mock REST API layer that normalizes products, customers, and orders across Shopify, WordPress, and BigCommerce.
LaravelPHP 8+RedisMySQL- Platforms
- 3
- Endpoints
- 45+
- Test focus
- Pest + contracts
Skills
Technical Skills
Relative depth across day-to-day work — strongest in Laravel APIs, MySQL, and production delivery.
Backend
- PHP / Laravel95%
- Node.js85%
- Symfony80%
- REST APIs95%
Frontend
- Vue.js85%
- Next.js / React80%
- TypeScript82%
- Tailwind CSS88%
Database & Caching
- MySQL92%
- Redis88%
- Query Optimization90%
- Database Design90%
DevOps & Tools
- Docker88%
- AWS82%
- GCP75%
- CI/CD / GitHub Actions85%
Other Skills
- API Design
- Microservices
- Clean Code
- Agile / Scrum
- SOLID Principles
- Payment Gateways
- Mentoring
- PHPUnit / Pest
Education
Learning & credentials
Education
B.Sc. Botany (Hons)
Dum Dum Motijheel Science College
2012 – 2016
Computer Application Certifications (Java, PHP, Python)
APTECH Konnagar
2017 – 2020
Certifications
- Smart Professional Java
- Smart Professional Python
- Python Pro Bootcamp
- Node.js, Express & MongoDB Bootcamp
- Ultimate AWS Certified Developer Associate 2026 DVA-C02
Testimonials
Trusted by engineers & operators
Feedback from managers, ops leads, and teammates who shipped with Deep.
- ★★★★★
“Deep owned our checkout APIs end-to-end — gateway failover, webhook reliability, and clean Laravel services. Releases felt calm instead of chaotic.”
AR Ananya Roy
Engineering Manager · Codeclouds
- ★★★★★
“He turned a fragile inventory workflow into something our distributors could trust daily. Beat-wise dues finally matched what finance expected.”
RS Rahul Sen
Operations Lead · Bengal Retail Group
- ★★★★★
“Strong mentor. Code reviews raised the bar for SOLID design, tests, and API consistency across the team.”
PG Priya Ghosh
Software Engineer · Product Engineering
- ★★★★★
“Our Shopify ↔ CRM sync stopped dropping orders after Deep rebuilt the webhook pipeline with Redis locks and idempotent handlers.”
ML Marcus Lee
CTO · Northwind Commerce
- ★★★★★
“Rare mix of production instincts and teaching. He cut our deployment time dramatically with Docker + GitHub Actions.”
SK Sneha Kapoor
DevOps Lead · CloudScale Labs
- ★★★★★
“Clear communicator who ships. The MSTORE dual-session model solved a real operational headache for our night shift.”
IA Imran Ali
Business Owner · City Wholesale
Blog
Notes from the backend
Architecture write-ups on payments, Redis, retail sessions, and maintainable Laravel services.
2026-03-12 · 7 min read
Designing idempotent payment webhooks in Laravel
How to absorb duplicate gateway callbacks without double-charging — event keys, transactional outbox, and replay-safe handlers.
LaravelPaymentsArchitectureRead article →2026-01-28 · 6 min read
Redis rate limits for multi-platform commerce APIs
Token buckets that protect Shopify/BigCommerce connectors while keeping webhook ingestion responsive under burst traffic.
RedisAPIPerformanceRead article →2025-11-04 · 5 min read
Modeling daily vs evening retail sessions
Lessons from MSTORE: isolating business-day boundaries, settlement dates, and sales entry UX for high-volume counters.
MySQLProductRetailRead article →2025-09-18 · 8 min read
SOLID service layers that survive real Laravel apps
When controllers stay thin, repositories stay boring, and domain services own the decisions — without drowning in ceremony.
LaravelSOLIDClean CodeRead article →
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Contact information
Email
biswasd94@gmail.comPhone
+91 8420105680Location
Kolkata, India