Web applicationdevelopment services for products your business runs on.

We design, build and launch web applications that real users log into every day. One team covers product analysis, UX, front end, back end, QA and the release pipeline, so nothing falls between vendors.
Discuss your web app

A web app is not a website. It has to work for every user, every day.

Logins, roles, data, payments, integrations and reports all have to hold together while the product keeps changing. As a web app development company, we plan for that from the first sprint: a clear data model, an architecture your next engineers can read, and releases you don't have to fear.

Why web app projects go off track

01

Scope that nobody wrote down

Requirements live in calls and chat threads. The estimate looks fine until the first demo shows two different ideas of the product.
02

Off-the-shelf tools stop fitting

Spreadsheets, no-code builders and plugins carried you this far. Now the workarounds cost more time than the work itself.
03

A prototype that can't grow

The first version was built to demo, not to scale. Every new feature breaks something that used to work.
04

Slow pages, frustrated users

Dashboards load for seconds, tables freeze on large data sets and support tickets keep piling up.
05

Integrations as an afterthought

Payments, CRM, ERP or identity providers get wired in late, and each one adds fragile code nobody wants to touch.
06

Releases are risky

No automated tests, no staging, manual deploys. Shipping on Friday is out of the question, and so is shipping fast.

Signs it's time for a custom web app

If a few of these describe your situation, a purpose-built application will pay for itself faster than another workaround.

1

Your team lives in spreadsheets

Critical processes run on shared files, copy-paste and manual checks that break as volume grows.

2

Customers ask for self-service

Clients email you for data, invoices or status updates they should see in a portal.

3

Data sits in five tools

Nobody has one view of orders, users or operations, so decisions wait for someone to build a report.

4

Your SaaS subscription bills keep growing

You pay for many tools that each cover part of the job and still need manual glue between them.

5

The current app can't keep up

Performance, security or design debt make every new feature slower and more expensive.

6

You have a product idea and a deadline

A launch, a pilot customer or an investor meeting needs a working web product, not slides.

What we build

Custom web application development, end to end

Web portals and dashboards

Customer, partner and admin portals with role-based access, reporting and the data views your users actually need.

Internal business tools

Apps that replace spreadsheets and manual steps in operations, sales, finance or logistics.

SaaS products

Multi-user web products with accounts, subscriptions and the admin side to run them.

Marketplaces and e-commerce

Catalogs, search, checkout and the seller or vendor tools behind them.

Front-end development

React, Next.js and TypeScript interfaces that stay fast with large tables, forms and charts.

Back end and APIs

Node.js and Python services, data models and APIs that your web app and future mobile apps can share.

Integrations

Payments, CRM, ERP, analytics and identity providers connected in a way you can maintain.

Rebuilds of existing web apps

We take over an aging or troubled web app, stabilize it and move it to a modern stack step by step.

What every web app we ship includes

Features change from project to project. These foundations don't.

Readable architecture

Data model agreed before coding starts

Clear split between front end, API and background jobs

Code review on every change

Documentation your next engineers can use

Access and data protection

Roles and permissions designed with you

Secure authentication and session handling

Input validation and protection against common attacks

Audit trail for sensitive actions where needed

Performance at real volume

Pagination and caching for large data sets

Database queries checked as data grows

Front-end bundles kept small

Monitoring of errors and slow requests

Safe, frequent releases

Staging environment that mirrors production

Automated tests on critical flows

CI/CD pipeline for every deploy

Rollback plan for each release

Our web application stack

Proven, widely used technologies, so you can hire for your product later and never depend on us alone.

React
Next.js
TypeScript
Redux
Node.js
NestJS
Express
Python
Django
PostgreSQL
MongoDB
AWS
Docker
GitHub Actions
Who is this for

Teams that need a web product, not a brochure site

Founders

You have a validated idea and need a team that can turn it into a working product and keep building after launch.

Product companies

You need a new module, a customer portal or a full rebuild while your team keeps the core product moving.

SMBs

Your operations outgrew spreadsheets and generic tools, and you want software shaped around how you work.

Non-technical owners

You know the business problem well. We handle the technical decisions and explain them in plain words.

What do you need first?

Plan a new web app

Scope, architecture and a realistic estimate.

Build a first release

A working product in front of real users.

Add a portal or dashboard

A self-service layer on top of your data.

Replace manual work

An internal tool instead of spreadsheets.

Fix a slow or fragile app

Stabilize, then speed up.

Grow an existing product

More features, more users, same quality.

How we take a web app from idea to production

01

Discovery

We map users, roles, data and integrations, then agree on scope, architecture and what the first release includes.

02

UX and prototype

Designers turn the flows into a clickable prototype you can test with users before anything is coded.

03

Iterative build

Short sprints with a working demo at the end of each one, so you see progress instead of status reports.

04

QA and hardening

Manual and automated testing, performance checks on realistic data and a security review of access rules.

05

Launch

Production setup, monitoring and a release plan agreed with your team, including data migration if needed.

06

Support and growth

We fix what users find, improve what they use most and keep shipping the roadmap.

How we work

Pick a starting point

Discovery Sprint first

most popular

A 2-week fixed-price Discovery Sprint

Fixed price. Build is quoted after discovery.

For new web apps and rebuilds where scope, budget and architecture still need to be pinned down.

User flows and feature list

Clickable prototype of key screens

Architecture and stack proposal

Release plan and estimate

Yours to keep, whoever builds it

Start with discovery

Dedicated web team

Designers, engineers, QA and a PM

Monthly, team-based. Scale as you go.

For products with a clear direction that need steady delivery over months.

Cross-functional team that already works together

Sprint demos and a shared backlog

QA and release pipeline included

Regular reports on progress and risks

Team size follows your roadmap

Discuss your team

Web applications we've built

AI Commerce PlatformE

QLode

USA
Europe

An AI-powered fashion commerce platform that helps retailers deliver personalized shopping experiences through virtual styling, AI recommendations, image search, and intelligent product discovery.

Before
→
after
↓
AI search didn't scale
↑
AI-based recommendation engine developed
↓
Scalable infrastructure needed
↑
Image & text search implemented
↓
Complex retailer integrations
↑
Multi-retailer integration architecture built
↓
Product discovery wasn't production-ready
↑
High-performance backend for AI-driven flows
Healthcare

Medical Lab Web and Native Mobile Applications

+30%
lab test orders
Read the case study →
SaaS

Magmaset: one tool for all project tasks

Read the case study →

Make the most of the experienced team

We are a global team of
creative
and
strategic thinkers
who specialize in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that meet our clients' needs.
We are a global team of
creative
and
strategic thinkers
who specialize
in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that
meet our clients' needs.
Learn more
85%
recurring customers
12M
the biggest fundraising round by one startup
X3 MRR
growth of partner's business in 5 mos
2 weeks
for project start
5+ years
av. partnership duration with SMBs and product companies

Why Gilzor

We've shipped web products for startups, SMBs and product companies, and most of those clients still work with us years later.

What we bring

Launch experience

70+ products launched across web and mobile.

Predictable delivery

98% of our projects are delivered on time.

Quick start

A project can start in about two weeks.

One team for the whole product

Analysis, UX/UI, front end, back end, QA and project management.

Industry context

Web apps for fintech, healthcare, edtech, e-commerce, real estate and logistics.

What makes us different

Scope before code

We agree on what gets built and why before the first sprint.

You own everything

Code, designs, documentation and accounts are yours from day one.

Demos, not promises

You see working software every sprint.

Long-term thinking

Average partnership with SMBs and product companies is 5+ years.

Overlap with US hours

Our engineers in Europe overlap with part of the US working day.

What our clients
frequently ask

How long does it take to build a web application?

It depends on scope. A focused first release is usually a matter of months, not years. After the Discovery Sprint you get a release plan with a timeline you can hold us to.

How much does custom web application development cost?

We price either as a fixed-price project after discovery or monthly for a dedicated team. The Discovery Sprint itself is fixed price, and it gives you the scope and estimate for the build.

Which technologies do you use for web apps?

Mostly React, Next.js and TypeScript on the front end, Node.js (NestJS, Express) or Python (Django, FastAPI) on the back end, PostgreSQL, MySQL or MongoDB for data and AWS for hosting. We pick what suits your product and your future hiring.

Can you take over a web app another team built?

Yes. We start with a review of the code, infrastructure and open issues, then stabilize what's critical before adding features. If a rebuild is needed, we plan it so users aren't left without a working product.

Will we own the source code?

Yes. Code lives in your repositories, and designs, documentation and cloud accounts belong to you.

Can the same team build a mobile app later?

Yes. We design the back end and APIs so a mobile app can use them, and our iOS, Android and React Native engineers can join when you're ready.

Do you support the app after launch?

Yes. Many clients keep us on for bug fixing, maintenance and new features after launch, with support terms agreed in your contract.

No sales pitch

Tell us about your web app

Share what the app should do and who will use it. We'll come back with questions, a suggested starting point and a rough estimate.

Next, a few optional questions so the first call is useful. We use your details only to reply to your request. Privacy Policy