Zethic is a software development company in Kolkata building custom software for startups, IT service firms, and enterprises across West Bengal. Our work covers web applications, mobile platforms, enterprise systems, and API integrations, each scoped to how the business runs rather than fitted to a template. From Salt Lake Sector V's IT corridor to New Town's startup base, the stack and team are decided after understanding the product, not before it.
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150+
Products Shipped
60+
Engineers In-House
96%
Client Retention
5.0
Rated on Clutch
This is for you if any of these ring true.
What you get in Kolkata.
We provide end-to-end software development services in Kolkata, from early product scoping through to deployment and maintenance. Rather than defaulting to whatever is quickest to ship, we choose the stack, architecture, and delivery model around what the business actually needs.
We build software tailored to how your business operates, whether that is an internal tool for a logistics firm, a customer-facing platform, or workflow automation for a growing team.
Logistics Internal ToolsCustomer-Facing PlatformsWorkflow AutomationCustom Software
When the product layer runs in the browser, that build plugs straight into our Custom Software Development Services.
For companies building a software product for the market out of Kolkata, we handle the full engineering cycle from architecture through to launch.
Product Engineering CycleArchitecture to LaunchRelease StabilityMobile Companion Apps
What we hand over is tested, stable, and engineered so releases keep moving quickly once you are live. And when a companion app is next on the roadmap, our mobile app development services cover it without a second vendor entering the picture.
Fragmented legacy systems are usually where our enterprise application work begins - we replace them with platforms that link departments and hand operations teams clear visibility across the whole business.
Legacy System ReplacementDepartment IntegrationOperational VisibilityConsulting-First Approach
Projects here begin with a consulting phase before code is written. Our guide on how to build a fintech app with AI covers compliance considerations for fintech-adjacent builds.
Payment systems, third-party platforms, internal databases, external services - we design and build the APIs that tie your software into each of them.
Payment System APIsThird-Party IntegrationVersioning & DocumentationError Handling
Every engagement ships with documentation, versioning, and proper error handling - the things that keep an integration maintainable long after handover.
Kolkata businesses bring us in to retire legacy infrastructure or to make tools cooperate that were never meant to - we manage the system migrations and platform integrations both scenarios demand.
Legacy MigrationPlatform IntegrationData IntegrityMinimal Disruption
Keeping data intact through the cutover, and keeping live operations running with minimal disruption, are the first priorities.
Some businesses can name the problem precisely but have not settled on what to build - for them, we open with a consulting engagement that works through architecture planning, build-versus-buy assessment, and tech stack selection.
Architecture PlanningBuild-vs-Buy AssessmentTech Stack SelectionConsulting Engagement
In Kolkata, this is the starting point for most of our longest-running client relationships.
Let's Build Your Next Digital Product, Together. Writing code is only part of it - what we deliver are products your business can depend on. When you're ready to begin, drop our team a line today.
We structure the process so nothing decided in the first week comes back as a problem at delivery. Whatever the size of the project, each software development engagement in Kolkata moves through an identical sequence, with a client checkpoint built into every stage.
Book a call{ 01 }
Before a screen is designed or a line of code written, requirements, third-party dependencies, resource allocation, and the technology stack are all mapped out - scope gets locked first, and only then does work move forward.
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We document the system architecture, database schema, and API design, then walk the client through each for review. Where the product calls for a strong interface layer, our UI UX design services team runs alongside this stage so visual and technical decisions never drift apart.
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Build follows the agreed specification. Weekly status updates, QA checkpoints, and code reviews come standard, which means issues show up while we are still building rather than at handover.
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No release ships until functional, performance, and security testing clear. Kolkata clients shipping fintech or healthcare products get an extra layer of compliance-specific test cases on top.
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The team that built the product is the one that sets up the production environment, configures the infrastructure, and runs the launch. Before any project with a mobile component kicks off, we sit down with clients to set realistic expectations around mobile app development timelines.
Why teams pick us in Kolkata.
From kickoff through launch, a documented delivery structure keeps the project predictable.
We treat security as an architecture decision taken up front, never a patch applied at the end.
Throughout the engagement, both architecture and code pass through senior engineering review.
Scoping, building, and deployment stay with one team, so context never gets lost between phases.
Built for Kolkata's industries.
Trusted voices. Real outcomes.
“We truly appreciated their dedication, technical expertise, and problem-solving approach.”
Young Onion
Department Head
“I was blown away by the knowledge the team had about creatives, e-commerce, website design, and optimization.”
Decathlon Sports India
Image Leader
“They have a good team of designers and project managers who help us with the designs using HTML, Angular, and React.”
Instarama
COO
“Their creativity stands out. A collaborative team that delivered high-quality solutions working closely with us.”
CodeGama LLP
Business Developer
“The product has become more intuitive and user-friendly. Load times dropped significantly after their work.”
Qoruz
Co-Founder
“Their commitment to timely delivery was impressive.”
CurleyStreet Media
Business Development Rep
“We truly appreciated their dedication, technical expertise, and problem-solving approach.”
Young Onion
Department Head
“I was blown away by the knowledge the team had about creatives, e-commerce, website design, and optimization.”
Decathlon Sports India
Image Leader
“They have a good team of designers and project managers who help us with the designs using HTML, Angular, and React.”
Instarama
COO
“Their creativity stands out. A collaborative team that delivered high-quality solutions working closely with us.”
CodeGama LLP
Business Developer
“The product has become more intuitive and user-friendly. Load times dropped significantly after their work.”
Qoruz
Co-Founder
“Their commitment to timely delivery was impressive.”
CurleyStreet Media
Business Development Rep
“Simply put, the quality of their code is excellent. They integrated third-party software and ensured GDPR compliance.”
VIA IOM
Director
“What impressed us most was how well they understood our brand and translated it into clean, thoughtful designs.”
GD Farm Fresh
Director
“Their team was patient, courteous, responsive, and technically proficient throughout the entire project.”
Studio by Nandita Manwani
Partner
“Zethic Technologies generally delivers on time and in line with our requirements – deployed in 30+ countries.”
SABA Hospitality
Executive Director
“Zethic built the features specifically to match our internal workflow and business needs. Professional and on time.”
Coral Publishers
Executive
“Zethic Technologies is a true partner.”
Geordana
CEO
“Simply put, the quality of their code is excellent. They integrated third-party software and ensured GDPR compliance.”
VIA IOM
Director
“What impressed us most was how well they understood our brand and translated it into clean, thoughtful designs.”
GD Farm Fresh
Director
“Their team was patient, courteous, responsive, and technically proficient throughout the entire project.”
Studio by Nandita Manwani
Partner
“Zethic Technologies generally delivers on time and in line with our requirements – deployed in 30+ countries.”
SABA Hospitality
Executive Director
“Zethic built the features specifically to match our internal workflow and business needs. Professional and on time.”
Coral Publishers
Executive
“Zethic Technologies is a true partner.”
Geordana
CEO
Questions, answered.
From first requirements through to post-launch support, a software development company in Kolkata carries products across the full cycle - planning, building, and maintaining web apps, mobile apps, enterprise systems, and APIs.
Custom software starts from your specific business processes and integration requirements and is shaped around them, whereas off-the-shelf software arrives with a fixed feature set aimed at a general audience - so going custom cuts out most of the workarounds a generic product forces on you.
We work across IT services, logistics, healthcare, edtech, engineering, and retail industries with a strong presence in Kolkata and West Bengal. Because compliance obligations differ from one vertical to the next, we make sure the domain context is settled before your project gets underway. The same delivery model runs at our custom software development company in Delhi, serving NCR's enterprise and public-sector demand.
On the web side we build with React, Node.js, Laravel, PHP, MERN, and GoLang, while mobile projects run on Flutter, React Native, Swift, and Android native. The product architecture drives our choice of database and cloud platform.
Expect 30 to 60 working days for a straightforward web application; a mid-complexity product with integrations typically needs 60 to 90 days. Multi-module enterprise systems can stretch the schedule to 4 to 6 months.
Scope, complexity, team size, and timeline set the number, but for comparable output, Kolkata-based development is significantly more cost-effective than hiring US or European vendors. For a look at how projects are typically scoped, see our web application development guide.
Yes, an NDA is in place before any detailed project discussion happens. Everything from the product idea to the architecture and business logic remains confidential, during the engagement and after it ends.
Yes, predictive analytics, personalisation, process automation, and fraud detection are all areas where we integrate AI into software products. The planning decisions in our post on how to build a web application from scratch carry over to AI-integrated builds as well.
Yes, as a software development company Zethic works with clients throughout India and internationally, in markets including the USA, UK, and Europe. We use structured collaboration tools to manage projects wherever clients are based, without any drop in delivery quality.
Our team works with Kolkata-based IT firms, logistics companies, and D2C brands, so we already know the compliance and integration demands specific to West Bengal's business environment. Every stage runs to a documented process, and a scoping call goes on the calendar within 24 hours of reaching out.
Tell us where you are
Starting fresh, modernizing legacy systems, or scaling up. We sign an NDA before any specifics.
Speak to an engineer
On the call itself, a senior engineer works through your goals and charts the quickest route to shipping.
Get a real plan
An engagement model suited to your stage, plus a scope band and a reference architecture.
Our team works with Kolkata-based IT firms, logistics companies, and D2C brands, so we already know the compliance and integration demands specific to West Bengal's business environment. Every stage runs to a documented process, and a scoping call goes on the calendar within 24 hours of reaching out.
