Software development agency · Sofia, EU · since 2008

Good ideas deserve great software.

We build

A 42-person team in Sofia that works like part of yours: one project lead who always answers, a demo every week, and your code in your repository from day one.

Book a 30-minute intro call See how we work
  • 18 yearsin business
  • 500+projects delivered
  • 42in-house specialists
  • 12+client countries
  • AWS
Trusted by teams at
  • Headspace
  • Fujitsu General
  • MSD
  • WISeKey
  • HDI
  • Danone
  • Nintendo
  • Deutsche Post
  • Orange
  • Loctite

What working with us is like

Dedication you can check, not just read about.

Every agency says it cares. These are the four things we commit to on every project – and how we keep each one.

One person who always answers

Every project has a project lead who replies within the working day – and you talk directly to the engineers who build your product, not through layers.

Nothing hidden

An itemised estimate before we start. A weekly demo of working software. Your repository and a shared task board from day one, so you always know where things stand.

Your product stays yours

EU contract, GDPR, and all source code and IP transferred to you. We have been doing this since 2008 – the company you sign with will still be here next year.

We say what we think

If a feature, deadline or technology is a bad idea, you hear it from us early. We would rather lose a day of comfort than months of your budget.

What we do

We solve business problems with software.

All services

Game development

HTML5 and mobile games with in-house art, animation and sound – including casual and casino titles.
  • HTML5
  • PixiJS / Phaser
  • 2D & 3D art
Explore

How we work

Your first 30 days with Atom.

The part of outsourcing most people worry about is the start. So here is exactly what it looks like.

An Atom project lead sketching a system structure on a flip chart for two colleagues
  1. Day 1

    We reply

    Within one business day you get a reply with questions, first thoughts and a proposed time for a call.

  2. Week 1

    Discovery call & estimate

    A 30-minute call to understand goals, users and existing systems. Within a few days: an itemised estimate, timeline and suggested team.

  3. Week 2

    Kick-off

    Contract signed, project lead and team introduced, repository, task board and communication channel set up. Design or sprint one starts.

  4. Every week

    Demo & decisions

    A short demo of working software, a written summary and the decisions we need from you. No surprises at the end.

  5. Launch & after

    Ship, then stay

    Launch with monitoring and a support agreement. Many of the platforms we built years ago are still running – and still maintained by us.

Working with us

Three ways to start, with honest numbers.

We tell you which one fits after the first call – including when it is none of them.

Fixed-scope project

Websites from €2,000

Platforms and apps typically €20,000–100,000+

A defined outcome with a fixed offer and agreed milestones.

  • Website in 2–4 weeks
  • Platform or app in 2–4 months
  • Itemised estimate up front
Discuss this model
Most clients choose this

Dedicated team

Monthly, per person

Starts in 2–4 weeks

Developers and designers who work only on your product, inside your process and tools.

  • You interview every hire
  • We handle HR, office and retention
  • Scale up or down with notice
Discuss this model

Team extension

By the skill you need

Short or long engagements

Specific capacity added to your in-house team: frontend, backend, mobile, AI, QA or design.

  • Works in your sprints
  • Senior people only
  • White-label for agencies
Discuss this model
A developer at the Atom office with code and a client’s website on screen

Sofia, every working day

Written here. Running across Europe.

Company portfolio

What we have done so far.

Explore more projects
The Atom Solutions open-plan office in Sofia with developers at work
42 people · Sofia, Bulgaria

The people you will work with

Employed, in one office, for years.

No freelancer marketplace, no bench. Developers, designers and project leads who sit together in Sofia, know each other’s work and stay – which is why the platforms we launched years ago are still ours to maintain.

  • We excelat leading projects to completion – proven practices, no drama.
  • We striveto put technology in service of your business, not the other way round.
  • Integritywe say what we believe and guide you away from bad decisions.
  • Curiositywe keep asking what would work better – for the code and for your business.

“We have kept Atom deliberately at a size where I still know every project and every client by name. If something is not going the way it should, you can reach me directly – and I will answer.”

Konstantin DinevManaging Director, Atom Solutions

Before we begin

A few useful answers.

The questions we hear on almost every first call.

What types of companies do you work with?

We work with businesses building web platforms, mobile products and digital services, as well as teams and agencies looking for development capacity – from start-ups to international brands, with clients in Germany, Switzerland, Austria, Denmark, the Netherlands, Belgium, the UK and the USA. The best starting point is the business problem you want to solve.

Can we work together from another country?

Yes – most of our clients are outside Bulgaria. Our Sofia location offers a shared working day with Western Europe, and we agree communication, reviews and delivery responsibilities at the start of each engagement.

Do you offer complete projects or dedicated developers?

Both. We can deliver an agreed project scope, or build a dedicated team that works with your roadmap. The right model depends on how clearly the work is defined and how it will evolve.

How much does a website, platform or app cost?

Websites start from around €2,000. Rebuilding an existing website with AI is a fixed €3,000–5,000. Custom web platforms, B2B systems and mobile apps typically range up to €100,000 and more, depending on scope and integrations. After a short call you receive a clear, itemised estimate.

How long does a project take?

A website usually takes 2–4 weeks; an AI rebuild of your existing website is ready in 3–5 days. A web platform or complex app takes around 2–4 months. Dedicated developers or a full team can typically start within 2–4 weeks.

Do you build AI solutions?

Yes. We integrate large language models (LLMs) and AI into custom software – assistants and chatbots, search over your own documents and data (RAG), document processing, AI agents and workflow automation – using OpenAI, Anthropic Claude and open-source models, with attention to data protection.

Who owns the source code?

You do. All source code and intellectual property are transferred to you under an EU contract, and you have repository access throughout the project.

How do we get an estimate?

Send a short outline of your product, priorities, existing systems and target timing. We reply within one business day to discuss the scope and the information needed for a useful estimate.

Say hello

Have a project in mind?

Tell us what you are planning. We reply within one business day with questions, ideas and next steps – free and without obligation.

No obligation, no sales pressure. You talk to a project lead, not a sales team.