Front-end development services for websites and web applications

Build the front end around the workflows, states, and integrations behind each screen

Merge builds new front ends and modernizes existing websites and web applications. When both UI/UX and engineering are in scope, we carry UI/UX decisions through into working code.

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What our front-end development services cover

Our front-end web development services cover new websites and web applications, along with the modernization of existing front ends. If you are deciding what to change first, our guide to planning a website upgrade can help set priorities, while the website UX audit e-book helps you identify usability issues worth addressing. As a front end development company, Merge can take on the full front-end scope, from responsive layouts and component architecture to the API integrations behind the interface. When technical direction remains open, we assess front-end framework choices against what the interface must do and what the codebase can support.

What Merge delivers in a front-end development project

Our front-end developers work with modern languages, libraries, and frameworks selected to fit the product, codebase, and team. If you’re still choosing a framework, our React, Vue, and Svelte comparison for startups explains the trade-offs in developer availability, ecosystem maturity, and performance. Front-end development deliverables can include:

How Merge aligns front-end work

Merge shapes custom front-end development services around your product requirements, interface behavior, technical constraints, and team responsibilities.

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Scope and direction

To set scope and technical direction, we review product requirements, interface priorities, system dependencies and, where relevant, the existing codebase.

Interface planning

Designers and developers turn screens, workflows, states, and responsive behavior into implementation tasks and finalize UI/UX decisions within scope.

Build and integration

Within the agreed integration boundaries, developers build in-scope components and product flows and connect them to application state and APIs where required.

Review and handoff

Developers review the interface, run the agreed checks, resolve in-scope findings, and prepare the agreed code and documentation for release or handoff.

When to bring in a front-end development agency

A new business website can start with approved designs or a brief that still needs UI/UX. Merge handles the front-end implementation, including responsive layouts, reusable components, and the integrations defined in scope. Our UI/UX design services cover the interface work that remains open.

An existing front end may need selected pages rebuilt or parts of an older implementation moved to a new stack. In Restream’s front-end work, Merge moved pages to Next.js, built reusable components for a new pricing page, and improved the login and signup flows. The case documents a targeted scope across specific pages and flows in an existing SaaS website.

Your team may already have implementation-ready designs for a new web app or SaaS product, or the interface may still need definition. Merge can build the screens, states, reusable components, and API connections included in scope. If both remain open, our SaaS design and development services cover product design and implementation in one scope.

Why choose Merge as your front-end development company

Design and development stay connected

When both are in scope, Merge's designers and front-end specialists carry agreed interaction decisions into the working interface.

Technology choices grounded in product needs

Before recommending a technical direction, we weigh product requirements against the existing codebase and the team maintaining it.

Technical trade-offs your team can evaluate

Your team sees the delivery impact of each scope or technical change before deciding how the work should proceed.

The right specialist in the room

When a question needs design or engineering context, the relevant Merge specialist joins the discussion with your team.

Clear ownership of the next step

We follow up on open decisions, surface blockers, and name the owner of each next action, so your team can track progress.

Product context shapes decisions

User behavior and business priorities shape front-end decisions alongside the technical constraints already present in your product.

How Merge approached five different front-end challenges

Each case shows how Merge adapted the work to the product, its users, and its delivery priorities.

Restream

Restream is a multistreaming SaaS that helps creators broadcast live video to multiple platforms at once. They required ongoing website design support to accelerate marketing campaigns and product launches. We delivered time-sensitive marketing assets, including sales banners, social media creatives, and new landing pages. This resulted in well-managed campaign delivery for sales events and gave the marketing team a steady flow of assets.

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1/5

What our clients say

Read Clutch review

“I’m actually more than happy with how this has been. Everyone is always on top of everything, and every question gets answered. Any request I may have had has been taken seriously.”

Jason Heiber, Founder of Morpheus Media

1/3

Read Clutch review

“They were very professional and efficient. Moving forward, I'll work with them for any dev or design project.”

Roy Wellner, Founder at Augment

1/3

Read Clutch review

“The Merge Development team is very good at what they do. It’s why we’ve continued to use their services even after a year. We plan to work with them for the rest of our business’s life.”

David Kemmerer, CEO & Co-Founder at CoinLedger

1/3

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Before your front-end project starts

Merge's front-end development services include responsive interfaces, reusable components, and attention to performance. Depending on the client's request and project stage, Merge can follow the client's existing design system or create one with its design team. API or back-end integration, documentation, accessibility requirements, full QA, handoff, and release support depend on the agreed scope. For Restream, Merge built a mobile-first pricing page with reusable components and improved the login and signup flows. Merge's guide to front-end development deliverables explains common deliverables in more detail.

Custom front-end development services are worth considering when a standard theme or builder would require product-specific logic to support the product's roles, workflows, interface states, integrations, or design-system rules. In Edgeport, Merge simplified intricate settings in a cloud-based hosting management platform for administrators and end users. That case supports role-specific interface work; it does not show that every complex website needs a custom build. The decision should follow the product's behavior, existing stack, and maintenance needs.

Yes, when the codebase supports safe incremental change. Merge first assesses the condition of the codebase, technical debt, architecture, and coupling. A targeted refactor or incremental migration can work when one area can change without increasing risk elsewhere. Merge may recommend a rebuild when the architecture blocks safe, effective development or partial changes would create more risk than value. For Restream, Merge migrated Pug views to Next.js while day-to-day website delivery continued. Whether old and new implementations can run side by side still depends on the architecture.

Yes, provided a technical audit confirms the stack and integration boundaries. Merge typically reviews the codebase and architecture, stack, environments, integrations, testing and CI/CD setup, delivery processes, required access, and responsibility split. The Restream engagement included work on an older front end. For Agentless, Merge delivered front-end and back-end development using Next.js, Flask, Supabase, AWS services, and an AI integration for property data and home-inspection reports. Compatibility depends on the client's specific stack. After the audit, Merge takes responsibility for the agreed scope through handoff, with delivery assessed against the agreed technical and functional criteria.

Merge chooses a front-end framework based on the client's goals and technical requirements. The decision also accounts for the current stack, the team that will build and maintain the product, expected scale, maintainability, community activity, and the framework's long-term prospects. Merge currently delivers front-end work with React and Next.js. Edgeport used React and Redux for administrator and end-user settings, while Agentless used Next.js with Flask and Supabase. The recommendation is project-specific; Merge does not treat React or Next.js as a universal default or as the best choice for every product.

Front-end development services can range from $20 to $60 per hour, while highly experienced front-end specialists may charge $150 or more per hour. For a well-understood scope, a fixed scope with a fixed estimate may fit; when the scope is likely to change, time and materials (T&M) or a dedicated developer or team may fit better. To estimate the work, Merge usually needs at least the main scope, pages or features, designs or wireframes, technical requirements, integrations, the desired timeline, and whether the engagement covers front-end only or also QA, project management, or post-release support.

A front-end project usually includes kickoff, estimation and planning, regular communication, development, QA, approvals, and release or handoff. The exact schedule depends on scope clarity, design readiness, legacy constraints, integrations, external dependencies, feedback turnaround, and release requirements. The sequence and duration vary by project, and the estimate should account for access, feedback, dependency resolution, and release approval as well as development time. These dependencies belong in the plan even when they sit outside the coding work.

At minimum, Merge developers review code, check the interface across browsers and devices, and test error states. Full professional testing and separate QA support depend on the agreed scope. Performance work may cover page-load speed and rendering; Merge may use Lighthouse or Core Web Vitals when relevant. Any target or score must be agreed in the project scope. On Restream, Merge handled front-end and QA work and reworked pages based on accessibility, flow, and mobile feedback. Specific accessibility targets, browser matrices, CI/CD checks, and release verification remain scope-dependent.

Merge's front-end development team can work alongside existing client teams. On Restream, tasks lived in a shared Linear backlog, the teams kept context in Notion, and Slack and frequent short calls helped them set priorities, unblock access, and bring in specialists when needed. That setup and cadence were specific to Restream. Roles, review points, call frequency, channels, documentation, release or handoff ownership, and any post-launch support vary by project and should be defined in the scope. Merge's How We Work page explains its broader ownership and asynchronous communication principles.

Outsourcing to a front-end web development company makes sense when you need more delivery capacity or a specialist and can give the external team clear priorities, system access, and decisions when needed. The client-side decision owner may be a founder, product lead, engineering lead, or subject-matter lead; the fit does not depend on a large internal product team. A defined release may suit a project engagement, while sustained capacity may point to a dedicated-team model. Merge's guide to outsourcing front-end development explains the options in more detail.