We design, build, and modernise JavaScript applications from a single storefront to a full enterprise platform with engineers who treat performance and maintainability as requirements, not afterthoughts.
Let’s Talk
85%
Long-term Partnerships
75%
Mid-to-Senior Engineers
5+
Avg. Years of Engineer Experience
98%
Would Recommend Us
This tends to be where teams reach out to us.
What we do, end to end.
We deliver JavaScript development services end to end, aligned with your business goals and backed by UI/UX design services where a project needs one.
Software shaped by your business logic, not a boilerplate’s.
Framework selectionData layer designArchitecture planningWorkflow-led build
Fully custom JavaScript applications built around your workflow, not a template. We choose the framework, data layer, and architecture based on what the product actually needs.
A web application that holds up under real users, not just a demo.
React front endsNext.js server renderingProduction hardeningReal-user testing
Interactive, production-grade web applications built with modern JavaScript, from React development front ends to server-rendered apps in Next.js.
An interface that stays consistent as the product grows.
Component architecturePerformance budgetsAccessibilityDesign-system implementation
Component-driven UI work focused on performance budgets, accessibility, and a design system your team can keep extending after launch.
Fewer moving parts between front end and back end.
Node.js servicesNestJS APIsBackground jobsShared language across the stack
End-to-end JavaScript, with Node.js development on the back end so your team works in one language across the stack, with fewer handoffs and faster iteration.
Applications that hold up to internal scrutiny, not just user traffic.
Role-based accessAuditabilitySSO and token authUptime-oriented architecture
Internal tools, admin platforms, and customer-facing systems built for the access control, auditability, and uptime enterprise use demands.
Fewer abandoned carts, more completed orders.
Payment integrationCatalog performanceMobile-first checkoutConversion tuning
Storefronts and checkout flows built as a trusted eCommerce web development company, covering payment integration, catalog performance, and mobile-first checkout.
An application that stays healthy long after go-live.
MonitoringDependency patchingPerformance tuningFeature growth
A team that monitors, patches, and tunes your JavaScript application after launch, plus AI development services support where an application needs AI-assisted features bolted in later.
our managed cloud services, for the scaling and infrastructure side of a JavaScript application.
Built for every vertical.
Why Zethic.
One team carries your project from architecture through deployment and support, so nothing gets lost in a handoff between agencies.
We treat load time and render performance as requirements we test against, not a cleanup task for later.
Authentication, input handling, and dependency hygiene are built into how we write JavaScript, not bolted on before launch.
Bring us a fixed-scope build or embed a dedicated JavaScript team in your existing sprint cycle we work either way.
Our achievements display our capabilities
Selected work, real outcomes.
Policy-management, IT-governance, vendor-management, and branch-banking platforms, each replacing a manual or legacy workflow with a purpose-built web application.
View All Case StudiesHow a JavaScript build runs with us.
Built around your bank's real workflows - not a generic delivery model.
Let’s Talk{ 01 }
We gather requirements, map the application’s data and user flows, and confirm the framework choice against your actual constraints.
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We define component structure, state management, and API contracts, working from the UI/UX design where one exists.
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Our engineers build in short, reviewable increments, with code review and staging deployments as standard practice, not an afterthought.
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We run unit, integration, and end-to-end tests against real usage patterns, catching regressions before your users do.
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We ship to production with a rollback plan in place, coordinating the release around your traffic patterns, not ours.
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Post-launch, we monitor real performance and keep dependencies and frameworks current so the application doesn’t quietly decay.
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
Ways to work with us.
Best when you have a clearly defined JavaScript build a new application, a specific module, or a framework migration.
Best when you need ongoing JavaScript engineering capacity embedded in your own sprint cycle.
Questions, answered.
JavaScript development services cover building, modernising, and maintaining web and cross-platform applications using JavaScript and its frameworks from front-end interfaces to full-stack, API-connected systems.
Everything from marketing sites and eCommerce storefronts to real-time dashboards, enterprise internal tools, and cross-platform mobile apps built with a shared JavaScript codebase.
Yes. We audit the current codebase, identify what’s safe to keep, and plan a staged migration to a current framework and architecture without stopping feature work entirely.
React, Angular, Vue.js, Next.js, and Node.js/Nest.js on the back end, chosen based on what fits the project rather than a single default stack.
Yes, with the right architecture around access control, auditability, and data handling, JavaScript frameworks scale well into enterprise-grade internal and customer-facing systems.
Yes. We regularly connect JavaScript front ends and Node.js services to existing REST or GraphQL APIs, payment gateways, and third-party platforms.
We profile the render path and bundle size, address code-splitting and caching, and fix the specific bottlenecks the data points to, rather than applying generic optimisations.
It depends on scope, framework choice, and integration complexity. We scope this upfront and provide a transparent quote before work begins no surprise costs mid-project.
Whether it’s a new product, a modernisation project, a performance problem, or a dedicated team you need embedded in your sprints tell us where you are. A senior engineer replies within one working day.
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Receive a Detailed Proposal
We'll deliver a comprehensive, no-obligation project plan, complete with a detailed timeline, transparent cost breakdown, and team structure.
Whether it’s a new product, a modernisation project, a performance problem, or a dedicated team you need embedded in your sprints tell us where you are. A senior engineer replies within one working day.
