FreshCartClient project
FreshCart
Fresh food & grocery commerce
Independent engineer. Endlessly curious.
Thoughtful design.Powerful engineering.
I’m Sayan Mondal, a DevOps and app developer in Kolkata, and founder of Opslin and Shotlin.
Design. Develop. Deploy.Founder, Opslin & Shotlin
A little about me 01 /
Good software starts
with a little curiosity.
And a lot of care.
I’m Sayan Mondal, an independent engineer and founder of Opslin and Shotlin. I bring design thinking and hands-on engineering together to build complete products — from the interface you touch to the infrastructure you don’t see.
My cloud development and DevOps work covers deployment pipelines, Docker, server operations and AI-assisted workflows. Alongside web, mobile and games, I build the systems that keep products running.
How I can helpThink01
Build
then
Better↗
Selected work 02 /
Client work.
Made for real people.
Real interfaces. Real products.
A closer look at the mobile experiences
I’ve built for clients.
FreshCartClient project
Client project
Dealker
Electronics marketplace
Client project
Bakaloo
Hyperlocal grocery delivery
RadhaClient project
Radha
Retail operations & store management
Behind the storefront
Commerce, conversations.
One connected platform.
Another side of Bakaloo.
WhatsApp CRM, agentic AI,
B2B commerce and a visual builder.
Client projectWhatsApp CRM
& Theme Builder.
The tools behind the customer experience: shared conversations, AI workflows, B2B commerce and storefront composition.
- Shared inbox, team chat & customer pipeline
- Agentic AI & human handoff
- B2B / B2C themes, sections & publishing
Product systems
One brand.
Two distinct projects.
The customer experience.
And the tools behind the counter.
Explore LNDRY and LNDRY POS separately.
Game design & development
From game design
to playable worlds.
2D and 2.5D. Mobile and PC.
Game design, gameplay engineering,
and the studio’s public website.
UnityGodot2D / 2.5DMobile / PCGame UI & systems
In development
Explore 6 game viewsRustbloom
An ongoing game project. Explore the actual mobile gameplay, world detail, settings and graphics interface.
Preparing for launch
Production ready · Launch preparation
ANTAR — The Last Flame
A distinct Agnix Studio game, preparing for launch. See the official announcement and production status.
Explore the gameCompany websiteWeb design & development
Agnix Studio website
The company’s cinematic web presence, built around the original studio identity and game announcement.
Explore the website projectBuilt by me
A product of my own.
From code to control plane.
My product / Founder & engineer
Your server.
Your server.
Your rules.
I founded Opslin to make deploying and operating software on your own VPS feel clear and connected.
- Apps, deployments & databases
- Monitoring, alerts & recovery
- Permissioned AI operations through MCP beta
What I do 03 /
One partner.
The whole picture.
A good product needs more than good code.
I connect the dots between design,
development, and delivery.
01Web & product engineeringNext.js / TypeScript / SaaSFast, accessible websites and full-stack products. From the first wireframe to the API, database and production release.
Landing pages, dashboards, multi-tenant SaaS, authentication, payments and realtime experiences. Designed around the people using them and built for the teams maintaining them.
Explore the scope and related projects02Mobile app developmentFlutter / iOS / AndroidThoughtfully crafted Flutter apps that feel at home on both iOS and Android.
Customer apps, vendor tools and delivery experiences, with clean architecture, dependable state management, notifications, payments and live tracking.
Explore the scope and related projects03AI & intelligent automationAgents / RAG / WorkflowsUseful intelligence, woven into your product and the way your team works.
Tool-using agents, retrieval systems and practical automations that connect to real operations. Clear inputs, measurable outputs and a human in control where it matters.
Explore the scope and related projects04Cloud & infrastructureGo / Docker / DevOpsReliable systems behind a seamless experience. Built to deploy, observe and grow.
Deployment pipelines, server provisioning, containerized services, SSL, monitoring and self-hosted infrastructure. A considered foundation from the start.
Explore the scope and related projects05Game design & developmentUnity / Godot / 2D & 2.5D / Mobile & PCPlayable worlds for mobile and PC. 2D and 2.5D games designed and developed with Unity and Godot.
Game concepts, gameplay systems, level and environment design, prototyping, touch and desktop controls, game UI, animation integration and performance tuning. From an early playable build to production and launch preparation.
A few useful answers.
Who is Sayan Mondal?
Sayan Mondal, also known as SayanTheCoder, is a software, app and DevOps developer based in Kolkata, India, and the founder of Opslin and Shotlin.
What does Opslin do?
Opslin is Sayan’s independent VPS deployment product. It connects applications, releases, domains, SSL, databases, logs, monitoring and rollback on a supported Linux server you control, with a permissioned MCP beta for supported AI-assisted operations.
What is Shotlin?
Shotlin is the product studio founded by Sayan Mondal. Its work connects interface design, websites, mobile applications, business dashboards and software engineering.
Can you build an app and deploy its backend?
Yes. My services cover Flutter mobile apps, web and backend development, and cloud deployment. The linked projects show customer apps, store tools, CRM workflows and infrastructure work.
The way I work 04 /
A clear process.
A better outcome.
Good communication is part of good engineering.
You’ll know what we’re building, why it matters,
and what comes next.
01 /
Find the right problem.
We talk through the idea, the people it’s for, and what success should look like.
02 /
Make it feel right.
Turn the direction into clear flows, considered interfaces, and a practical plan.
03 /
Build. Refine. Ship.
Thoughtful engineering, honest feedback, and the details that make it ready for the world.
A few things I believe
The details make
the difference.
01
Design is engineering.
Every pixel, interaction and loading state is part of how a product works.
02
Own the whole journey.
From your first idea to the systems that keep it running after launch.
03
Build for real people.
Useful, accessible software that makes someone’s day a little easier.