Custom softwaredevelopment services shaped around how your business works.

When off-the-shelf tools force workarounds, we design and build software that fits your process, your users and your data, then keep it running as the business grows.

Discuss your idea

Off-the-shelf gets you started. Custom software gets you ahead.

Generic SaaS covers the common case. Your edge usually lives in the part it doesn't: a pricing rule, a workflow, an integration or a customer experience nobody else offers. Custom software turns that edge into a product you own, without paying for features you never use.

When packaged software stops fitting

Workarounds everywhere

Teams export to spreadsheets, copy data by hand and keep the real process outside the tool.

Systems that don't talk

CRM, billing, inventory and support each hold part of the truth, and nobody trusts the totals.

Licenses that grow faster than you

Per-seat pricing and add-ons keep rising while the tool still misses what you need.

No room to differentiate

Your customers get the same experience your competitors offer on the same platform.

Data you can't use

Reporting is locked inside a vendor's dashboards, and your own data is hard to get out.

Building alone is risky

Without an experienced team, custom projects run over time and end up harder to maintain than the tool they replaced.

Signs you need custom software

Custom software pays off when the process is core to your business and the tools around it fall short.

Your product is the software

You're building a SaaS, marketplace or app, and there's nothing to buy off the shelf.

A process runs on spreadsheets

Operations depend on files only two people understand.

You need several systems connected

Orders, payments, logistics and reporting need to work as one.

You outgrew a no-code build

The prototype proved the idea, but it can't handle more users or more logic.

Customers ask for features you can't add

Your platform vendor's roadmap decides what your customers get.

You want to own the IP

Investors or buyers will value technology you own more than tools you rent.

What we build

Custom software development company for web, mobile and back end

Web platforms

SaaS products, marketplaces and customer portals in React, Next.js and Node.js.

Mobile apps

Native iOS and Android apps, or React Native when one code base fits better.

Internal tools

Back-office systems, admin panels and workflow tools that replace manual work.

APIs and integrations

Connections to payment providers, CRMs, ERPs and partner systems.

AI and ML features

Search, recommendations, document processing and other AI features where they solve a real problem.

Data and reporting

Data models, pipelines and dashboards built on PostgreSQL, MySQL or MongoDB.

Modernization

Rebuilding legacy systems step by step while the old one keeps running.

Cloud and DevOps

AWS infrastructure, Docker, Kubernetes and CI/CD pipelines for reliable releases.

Software product development company for startups

For startups, custom software is the product. We help you build the right first version and grow it from there.

From idea to first release

Fixed-price two-week Discovery Sprint

Scope cut to what users need first

Architecture that can grow

From release to growth

Features driven by user data

Team size that follows funding

Performance work before it hurts

Ready for investors

Code and IP that you own

Documentation for due diligence

A clear technical roadmap

Our custom software stack

We pick technology for the product's needs and your team's future, not for our convenience.

React

Next.js

TypeScript

Redux

Node.js

NestJS

Express

Python

Django

FastAPI

Swift

Kotlin

PostgreSQL

MySQL

MongoDB

AWS

Docker

Kubernetes

RabbitMQ

TensorFlow

Who is this for

For businesses whose edge is in the details

Startups

As a custom software development company for startups, we build the product your pitch deck promises.

SMBs

Tools that fit your operations, so your team stops working around software.

Product companies

New modules, new platforms and modernization alongside your own team.

Non-technical founders

A team that turns business requirements into working software and explains every decision.

Industries we build for

Fintech

Payments, payroll, trading and financial dashboards.

Healthcare

Patient apps, lab systems and clinical workflows.

Edtech

Learning platforms, school systems and educational apps.

E-commerce

Marketplaces, storefronts and AI product discovery.

Real estate

Listing platforms, marketplaces and property tools.

Logistics

Delivery tracking, dispatch and operations software.

How we build custom software

Discovery Sprint

Two weeks, fixed price: we map the process, users and data, and agree on scope and architecture.

Design

Flows, prototypes and screens tested with you and, where possible, with real users.

Development in sprints

Short sprints with demos, code review and QA on every build.

Testing and launch

Regression testing, release preparation and a controlled rollout.

Support and growth

Monitoring, fixes and new features as the business changes.

How we work

Choose how to build

Fixed-scope project

most popular

Starts with a two-week Discovery Sprint

Fixed price after discovery.

For a defined system with a clear first release.

Scope and architecture agreed up front

Fixed timeline and price

Design, development and QA

Demos every sprint

Launch and stabilization

Start with discovery

Dedicated team

A team that keeps building over time

Monthly, team-based.

For products where requirements will keep evolving.

Team lead, engineers, QA and a PM

Priorities reset each sprint

Room to change scope

Progress and risk reports

Team grows with the product

Discuss a team

Custom software we've built

Data MANAGEMENT & payroll

AI Payroll Platform (NDA)

Europe

An AI-powered payroll validation platform that extracts data from salary slips, verifies payroll calculations, and automates reporting and approval workflows for HR and finance teams

Before

→

after

↓

Manual payroll validation

↑

17% fewer salary calculation errors

↓

Complex PDF extraction

↑

AI-powered PDF data extraction

↓

Manual approval workflows

↑

Automated payroll validation and reporting workflows

↓

Limited processing scalability

↑

Scalable platform for payroll processing

Manufacturing

Incident management system for auto parts manufacturer

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 built custom software for startups, SMBs and product companies across several industries, and most of those clients still work with us.

What we bring

Experience

70+ products launched.

Predictable delivery

98% of projects delivered on time.

End-to-end team

Business analysis, design, engineering, QA and project management.

Broad stack

Web, mobile, back end, cloud and AI under one roof.

Fast start

Projects can start in about two weeks.

What makes us different

Scope before code

Discovery comes first, so the build matches the real need.

You own it all

Source code, IP, accounts and documentation belong to you.

Built to maintain

Tests, code review and documentation are part of the job.

Long-term support

85% of our customers come back with new work.

Overlap with US hours

Teams in Warsaw and Limassol share part of the US working day.

What our clients
frequently ask

What are custom software development services?

Designing, building and supporting software made for one business: its users, processes and data. It can be a customer-facing product, an internal tool or the integrations that connect your systems.

When is custom software better than an off-the-shelf tool?

When the process is central to your business, when you need systems to work together or when packaged tools force costly workarounds. If an existing tool fits, we'll tell you.

How do you estimate a custom software project?

We start with a fixed-price, two-week Discovery Sprint. It produces the scope, architecture and plan we base the estimate on, so the price reflects the real work.

Do you work with startups?

Yes. We build first versions for startups and keep developing them after launch, often as the product's main engineering team.

Who owns the software you build?

You do. Source code, intellectual property and every account we set up are yours.

Can you work with our existing systems?

Yes. Most projects connect to existing tools, databases or APIs. We review them during discovery and plan integrations from the start.

What happens after launch?

We can keep supporting and developing the product, or hand it over to your team with documentation.

No sales pitch

Tell us what you want to build

Describe the problem, your users and the systems you use today. We'll suggest how to start and what discovery should answer. If custom software isn't the answer, we'll say so.

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Custom Software Development