Software engineering, delivered by a team that stays.
BigTree108 is a software development company in Ukraine that builds and operates software for product companies in Europe and North America: .NET and Python backends, Angular, React and Vue front ends, mobile apps, cloud and DevOps, QA, design and delivery. More than thirty people, working in your time zone, on contracts that run for years rather than sprints. If you are weighing up where to outsource software development, that page explains the three ways an engagement with us can run.
The company in numbers
- 30+
- people on the team
- 20+
- client organisations
- 20+
- client projects delivered or running
- 13
- engineering and operations disciplines
Source: BigTree108 staff directory, 4 September 2026
What we do
Nine services, all staffed from the same team, so the backend, the app, the tests and the design are one conversation rather than four vendors.
.NET development
ASP.NET Core APIs, Azure Functions, EF Core and SQL Server from our largest engineering practice, backed by a Top Rated Plus Upwork agency. Take-overs of existing codebases welcome.
Python development
Python backends, data pipelines, AI agents and vector-database work, on AWS or Azure, delivered by engineers we hire and interview for exactly that stack.
Front-end development
Front ends on Angular, React, Vue and Next.js: design systems, accessibility checks on every component, and end-to-end tests that run before every release.
Mobile development
Native iOS apps in Swift, cross-platform apps in .NET MAUI and React Native, built by engineers who also own the backend the app talks to.
Cloud and DevOps
Azure Functions, Azure SQL with Always Encrypted, Terraform for every resource and GitHub Actions pipelines, with drift detection and cost control built in from the start.
QA and test automation
Manual QA, test plans and automated suites in Playwright, run in continuous integration so a failing test blocks the release rather than reaching your users.
UI and UX design
Figma design systems, prototypes and interface design, handed to engineers in the same company who build them pixel-accurate and accessible.
Webflow and WordPress
Marketing sites in Webflow and WordPress, built to load fast, rank and stay editable by your own marketing team, with the option to move to a custom front end later.
Dedicated team
Long-term specialists embedded in your team, from .NET and Python engineers to QA, designers, project managers and executive assistants. Contracts, invoicing, payroll and leave handled on our side.
Proof, not adjectives
Our client record as a company, on the platform where it is public and verified by someone other than us.
- Top Rated Plus
- Upwork status of the agency
- 100%
- job success score
- 50
- jobs completed through the agency
- 11,121
- hours worked for clients
Source: BigTree108 agency profile on Upwork, checked 4 September 2026
Built the way we build for ourselves
Everything we run internally, from hiring to invoicing, is one platform on the same stack we offer clients: .NET on Azure Functions, Angular, Azure SQL, Terraform. We have lived with our own architecture decisions long enough to know which ones were right, and that is the judgement we bring to your product.
How an engagement starts
Send the scope
A repository link, a product brief or a list of problems in a system you already run. We sign an NDA first when needed.
Get a written plan
Within one business day you receive the questions we still have, the approach we propose and an estimate you can hold us to.
Start with a visible first week
The first deliverable is small and shippable, with tests, so you can judge the work before committing to more.
Questions clients ask first
What kind of software development company is BigTree108?
A custom software development company from Ukraine with a team of more than thirty: .NET and Python backends, Angular, React and Vue front ends, iOS and .NET MAUI apps, Azure and DevOps, QA and test automation, and UI and UX design. Clients either embed our specialists in their own team for the long run or hand us a project or an existing system to deliver and run.
Where is BigTree108 based?
BIG TREE 108 LLC is registered in Ivano-Frankivsk, Ukraine, and the team works remotely from across the country. The registration number and the address are published on the contact page with links to the state register, so you can verify the company before you sign anything.
Can a company in the EU or the United States contract you directly?
Yes. BIG TREE 108 LLC signs the agreement, invoices you directly and assigns the intellectual property to you. If you would rather keep the contract and payment protection inside a platform, the same team is available through our Top Rated Plus Upwork agency.
Which time zones do you work in?
Yours. For clients in the EU and the UK the overlap is a full working day. For North America we assign and hire people who work your schedule, Pacific included, so your stand-up, your reviews and your incidents are covered live.
Do you sign an NDA and assign the intellectual property?
Yes, before any access is granted. Our own specialist contracts already assign all work product to BigTree108, so the chain of ownership from the person doing the work to your company is complete.
How does an engagement start and how do you charge?
Send the scope, a repository link or the role you need filled. Within one business day you get a written plan and an estimate you can hold us to. Dedicated specialists are billed per person, hourly or monthly, with the hours visible to you throughout the month; project work is estimated in writing and starts with a small, shippable first deliverable.
Tell us what you are building
Send the scope, a repository link or a rough idea. You get a written plan and an estimate within one business day.