Custom website development for your business
We build professional websites that don't just look good: they help your business win customers and grow.
From corporate websites and product pages to complex web platforms, our team in Sofia handles the whole build: UX/UI design, development, integrations, technical SEO and ongoing support, for clients across Europe and the US.
We reply within one business day. You don't need a finished specification to get started.
- 15+ years of experience
- 100+ projects delivered
- 40+ in-house specialists
ISO/IEC 27001:2022 certified
Among our clients
15 years of building websites and web platforms
A good website starts with understanding the business, its customers and its goals.
At Sirius Software we combine business analysis, UX/UI design, software development and testing to build websites that grow with your company.
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Since 2011
Websites and platforms for clients in Bulgaria, Italy, Spain, Poland, Romania and the US.
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A complete team
Design, development, QA and project management in one team.
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Nearshore, in the EU
An EU company in Sofia: EU data protection rules, communication in English and working hours that overlap with the UK and the rest of Europe.
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Long-term partnership
Ongoing development, integrations and technical support after launch.
Certified information security
Our information security management system is certified to ISO/IEC 27001:2022 by Q-AID Europe (certificate No. QE/111/24) for the design, development, implementation and maintenance of software products. We have been certified since 2021.
What websites do we build?
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Corporate websites
Present your company professionally with a multilingual corporate website, content management and integrations with your internal systems.
See our projects -
Business websites
Websites for small and medium-sized companies, with a clear presentation of your services, easy navigation and built-in lead generation.
How to brief your project -
Product websites and landing pages
Pages for products, services and marketing campaigns, built around one clear action and optimised for conversions.
Landing page design -
Real estate websites
Websites for developers and construction companies, with interactive buildings, apartments, live availability and enquiry forms.
See the NTK House project -
Redesign and modernisation
Upgrade an existing website with better design, performance, technical architecture and user experience.
Migrating from WordPress -
Custom web solutions
Websites with bespoke features, client portals, CRM/ERP integrations and business process automation.
Custom software development
Looking for an online store? See our e-commerce development
Everything a professional website needs
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UX/UI design
Design built around your users and your business goals.
Web design -
Responsive development
Looks and works right on phones, tablets and desktops.
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CMS
Edit your texts, images and content yourself.
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Technical SEO foundation
Semantic structure, metadata, indexing and technical optimisation.
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Integrations
CRM, ERP, marketing tools, APIs and third-party systems.
Custom CRM development -
Support and development
Updates, monitoring, improvements and new features.
Software maintenance
Websites and platforms we have built
A selection of our work for brands and online stores, real estate, wine estates and financial services.
Online store
Nomination
Nomination is a world leader in fashion jewellery for men and women, designed and crafted mainly in Italy with artisanal techniques and high-quality materials. Nomination puts its name on every piece to guarantee its authenticity and provenance.
What we built: Build a modern, sleek brand store for Bulgaria.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
Construction company website
NTK House
NTK House is a construction company building modern residential buildings in Sofia, including Manastirski Livadi and SM Residence in Simeonovo.
What we built: A bilingual website with a searchable property catalogue showing live availability, a page for each development, completed projects, news and an enquiry form.
- PHP
- Symfony
- MySQL
- JavaScript
- HTML
- SCSS
Website
Бяла карта
Access Finance, the company behind Byala Karta, was founded in 2013 by a team of ambitious young people. In less than 10 years, an idea born in a 4-square-metre office grew into an international business in 4 European markets, with 240,000 customers and a team of over 210 people.
What we built: Build a new web platform for one of the biggest credit companies in Bulgaria.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
Estate and villa website
Colline Albelle
Colline Albelle is a renovated 18th-century estate in Riparbella, Tuscany, with a villa for guests, vineyards and its own wines.
What we built: A showcase website for the estate's stays, events, tastings and wines, with a gallery, news and a direct link to booking.
- PHP
- Symfony
- MySQL
- JavaScript
- HTML
- SCSS
Online store
seewines
Wine bar, wine shop or wine gallery – Seewines Gallery goes by many names. It offers over 1,400 wine labels from around the world: an exciting journey into the world of wine for true explorers, where every sip awakens memories and emotions.
What we built: Build a brand-new online store and migrate the old one to the new platform without losing its search rankings.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
Website
Vivacredit
Vivacredit is a market leader with more than 10 years of experience in consumer lending and part of Management Financial Group (MFG), the largest Bulgarian holding in non-bank financial services in Central and Eastern Europe.
What we built: Build a web platform for one of the biggest short-term loan companies in Bulgaria.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
Winery estate website
AYA Estate Vineyards
AYA Estate Vineyards is an estate with a winery, vineyards, accommodation, restaurants, wellness and an equestrian centre.
What we built: A website that brings together the winery, accommodation, restaurants, events and wine shop, with an age check on entry.
- PHP
- Symfony
- MySQL
- JavaScript
- HTML
- SCSS
Online store
Benu
BENU Pharmacies, part of the PHOENIX Group, is a leading European pharmacy chain with 1,400 locations in 14 countries. With 8,500 employees serving 65 million customers, BENU is now entering Bulgaria to set a new standard in patient care.
What we built: Build a new online store and migrate the old one to a modern platform with a better user interface.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
Website
Juzt
Access Finance Inc. is redefining the financial experience with Juzt, an innovative digital credit card used on a smartphone. Issued by The Bank of Missouri, the Juzt card offers secure payments and wide acceptance.
What we built: Build a web platform for a consumer lending company in the USA.
- PHP
- Symfony
- MySQL
- Javascript
- HTML
- SCSS
How does a website project work?
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Discovery and planning
We get to know your business, the project goals, your audience and the features you need.
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UX/UI design
We design the structure, the user journeys and the visual style of the website.
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Development
We build the approved design, the CMS features and the integrations you need.
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Testing and launch preparation
We check functionality, security, responsive layouts, performance and technical SEO.
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Launch and support
We publish the website and, if needed, carry on with technical support and development.
Manage your content with ease
Your website should be able to evolve without every change needing a developer.
We build websites that let you manage texts, images, news, pages and other content, depending on what your project needs.
Where needed, we connect the website to your CRM, ERP, marketing platforms and other services.
Over 15 years we have built our own ready-made modules for content management, multiple languages, forms, galleries, SEO and integrations. That is why we launch fast, and why your budget goes into what makes your project unique rather than into foundations we have already proven in dozens of projects.
We also add AI integrations and automation where they bring real business value. See our AI services
How much does a custom website cost?
The cost of a website depends on its scope, design, features, integrations and the content it needs.
A business website with a few information pages is a very different job from a multilingual corporate portal with client accounts and links to internal systems.
That is why we start by clarifying your requirements and then propose a solution that fits your project.
For a more accurate quote from the first call, see how to write a technical specification for your project.
Typical timelines
- Landing page
- from 1 week
- Business website
- 2–3 weeks
- Multilingual corporate website with integrations
- 4–6 weeks
These timelines are possible thanks to our ready-made modules and assume the content is ready and feedback comes on time. For more complex platforms, we plan the schedule after the analysis.
Request a tailored quoteWebsite development FAQ
How long does it take to build a website?
Thanks to the ready-made modules we have built over 15 years, most projects get going quickly: a landing page takes from 1 week, a business website 2 to 3 weeks, and a multilingual corporate website with integrations 4 to 6 weeks. The exact schedule depends on the scope, the content and the integrations, and we confirm it after the initial analysis.
What does the cost of a website depend on?
It depends on the number and type of pages, the design, the features, the integrations and the content. After a call and an analysis of your requirements, we send a specific proposal with the scope, timeline and price.
Can I edit the content myself?
Yes. In projects that include a content management system, you can edit agreed elements such as texts, images and pages yourself.
Do you offer SEO?
We can include a technical SEO foundation in the build: a clean HTML structure, metadata, image optimisation, mobile compatibility and indexing readiness. Any further SEO work is agreed per project.
Can you update an existing website?
Yes. We can review your current website and propose a redesign, a technical modernisation or a new build.
Can the website be integrated with a CRM or ERP?
Yes. We build custom integrations with third-party platforms, business systems and APIs, within what each system technically allows.
Will the website work well on mobile devices?
Yes. We build responsive interfaces designed for different screen sizes and the key user journeys.
Can AI search engines find the website?
We can prepare the content and the technical structure so that the pages are accessible to the relevant search systems. Appearing or being cited in a specific AI answer, however, cannot be guaranteed.
Do you work with clients outside Bulgaria?
Yes. We have built websites and platforms for clients in the US, Italy, Spain, Poland, Romania and other countries. We work remotely and in English, and as an EU company we follow EU data protection rules.
Have an idea for a new website?
Tell us about your project. We will discuss your goals, the features you need and the possible technical solutions.