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Leobit is a full-cycle . NET, AI, and web application development provider for technology companies and startups primarily located in the US, EU, and the UK. We have representative offices in Austin, TX (USA), Tallinn (Estonia), Kraków (Poland), London (UK) and the development center in Lviv (Ukraine) with 170+ talented software engineers, architects, QA experts, and UI/UX designers. Our Achievements:Microsoft Solutions Partner - Digital & App InnovationISO 9001:2015 and ISO 27001:2022 CertifiedISTQB Platinum PartnerTop . NET Developers in 2025 by ClutchCustomer Service Department of the Year in 2025 by Stevie® AwardsLeobit has successfully delivered over 150 well-designed and well-factored web & mobile applications to technology companies ranging from Fortune 500 firms to Silicon Valley startups. Our Services:. NET software developmentAI/LLM software developmentCustom software developmentDedicated development teamWeb app developmentMobile app developmentCloud developmentSoftware architecture designUI/UX designBusiness analysisQuality assuranceApp support & maintenanceTechnology consultingOur Key Technologies:Microsoft Stack: . NET, ASP. NET, C#, Azure, WCF, Entity Framework, MaUI, BlazorWeb/Frontend: React, Angular, Vue, jQuery, TypeScriptBackend: . NET Core/C#, Ruby, Node, PHP, PythonMobile Technology Stack: iOS, Android, Flutter, Swift, KotlinAI integration

We support digital transformation for governments.  Kitsoft is a tech company based in Ukraine with a 10-year expertise in GovTech and Smart City. We develop digital solutions for both central government and cities. In 2022, we gathered all our experience and created the low-code platform Liquio for fast digitization.

IdeaSoft is an EU-based custom software development company with more than 8 years of experience and 350+ delivered projects. We provide innovative solutions for early-stage startups and implement high-tech technologies into enterprise ecosystems.  IdeaSoft is an official partner and member of Sigma Software Group since 2021.  OUR AREAS OF EXPERTISE: Blockchain solutions & Web 3 DeFi & CeFiSmart Contract Development Fintech & Banking Web & Mobile Development (iOS, Android)QA Testing & Technical SupportUX/UI AI/ML IT Consulting & Product DesignWe have a proven track record of successful project launches, contributing to over 350 large-scale initiatives across corporate, enterprise, and government sectors.  

You’ve got the strategy. We turn it into working solutions. For 20+ years, Sigma Software has worked with Fortune 500 companies, global vendors and technology start-ups. Our mission is to help innovation leaders move critical initiatives forward by aligning teams, systems, and priorities. With 1,800 engineers in AI, data, cloud, embedded, and cybersecurity, we deliver solutions that scale and last, with ISO-certified quality, security, and compliance embedded from day one. Strategic Initiatives we support:AI Adoption – use AI where it brings tangible value, starting from first pilots and scaling to wider use. Digital Product Innovation – create new software or add digital layers to existing products and services, built with security and compliance in mind. Experience Design – shape journeys across apps and portals so users reach the right outcomes with less friction. Regulatory Compliance – navigating the regulatory landscape complexity and translating standards into working processes for audit-ready operations. Operational Efficiency – replace slow or manual work with modern, automated solutions that cut cost and effort. Managed Services – ensure stability, security, and uptime without draining internal teams. Our work goes beyond solution delivery. Sigma Software Labs works with startups to shape and test new ideas. Sigma Software University not only grows future engineers but also helps our clients build internal capabilities through tailored literacy programs and training. Our R&D teams experiment with emerging technologies early, so when they become relevant, our clients can adopt them faster and with less risk. Together, this cycle of delivery, learning, and exploration makes us better partners and strengthens the outcomes we deliver.

CallChecker is an AI-powered call analytics platform designed to give businesses complete control over their call-based operations. Whether you’re managing a call center, sales team, or customer support department, CallChecker helps you monitor 100% of your calls, surface valuable insights, and make data-driven decisions that drive growth. We don’t just help teams hear what’s being said — we help them understand what it means. What sets us apart:► Analyze every call (not just a sample) to ensure total visibility► Cut costs by 10x by automating manual quality control processes► Transform agent training and coaching with fast, AI-backed feedback► Ensure rule compliance through AI-enhanced script tracking► Enable faster onboarding and smarter development decisionsWith multilingual support and rapid setup, CallChecker is the go-to solution for teams looking to scale quality, not just volume.

Full-cycle iOS and Android Application development agency from Zaporizhzhya, Ukraine. Website-portfolio: https://cookiedev. com/ Full-cycle means that we provide services at every stage of iOS and Android application development process.  We grow our business by helping our customers to grow theirs.  We build iOS apps (iPhone, iPad) and Android apps (phone and tablet) of any complexity or style (material style, flat style):- delivery and ordering systems related applications- logistics mobile applications- marketplace apps- video and chat applications, WebRTC / VoIP, socket connection- booking mobile apps- online TV applications- educational applications- applications for online stores- cleaning services- in-app purchases and in-app subscriptions related apps- iOS apps with iOS specific features- Android material apps with Android specific features- AndroidTV applications- you tell it - we do it iOS skills include but not limited to:- Swift 3 / Objective-C- iOS SDK, xCodeb- Protocols: JSON-RPC, XML, RPC, SOAP, REST. - Integration with existing social networks: Facebook, Twitter, Vkontakte, G+- 2D games: Cocos2D, Cocos2Dx- E-books (static or interactive), Newsstand- Databases: SQLite, CoreData- BLE 4. 0- Mobile advertisement: iAd, AdMob, AppLeads, Flurry, AdWhirl- Other servises and SDKs: Braintree, Liqpay, Yandex. Money, Branch, Maps (OSM, Google, Apple), LinPhone, FrozenMountain, ooVoo, Flurry Analytic, Google Analytics, Crashlytics, Test Flight, other Android:- Java / Kotlin- Encryption: OpenGPG. - Protocols: JSON-RPC, XML-RPC, SOAP, TCP/IP. - simple applications OpenGL ES- Integration with social networks (Facebook, Twitter, Vkontakte, MailRu, Odnoklassniki), Google services (e. g. Youtube, Google Cloud Printing), Payment gateways (Braintree, PayPal, Liqpay, Yandex. Money)- Interaction with external devices (BLE 4. 0/SPP/USB). - Android SQLite- Google Billing, in-apps- VoIP and WebRTC integrations React Native skills:- TypeScript- Node. JS (MERN stack)- JavaScript- ES6+- MongoDB- HTML5, React, CSS- Redux- Material UI Web technologies stack:- React. js,- Angular. JS, Angular 2+- Laravel (PHP framework),- Symfony (PHP framework),- Node. JS,- VueJs- Express. js,- Bootstrap,- Jquery- Integration with social networks (Facebook, Twitter, Vkontakte, MailRu, Odnoklassniki), Google services (e. g. Youtube, Google Cloud Printing), Payment gateways (Braintree, PayPal, Liqpay, Yandex. Money)- Protocols: JSON-RPC, XML-RPC, SOAP, TCP/IP and much much more.  You come to us with an abstract idea and after time we’ll submit a fully functional app to AppStore or Google Play Market. We create Tech Specs documentation, mockups, app designs, development itself, application updates as well as upgrades, along with many other services more or less connected with iOS and Android development.  

Those who strive to be special, become significant. Award-winning creative studio from Ukraine. Bambuk creates a comprehensive product and specializes in strategy, branding, web and video production, developing sustainable solutions based on high-quality research and deep insights that reveal the uniqueness of each business. For more than 18 years, we have worked with the world's largest and most famous companies, such as Applied Materials, Ambiq, Tefal, Groupe SEB, Amazon, Credit Agricole, Mondelez, etc.

Rebbix provides product engineering teams that help companies turn ideas into scalable products with measurable impact.  We blend strong product thinking, robust AI-driven engineering, and smart automation to accelerate delivery, reduce operational friction, and keep quality high as products evolve.  Our teams operate as autonomous product units, supporting everything from MVP validation and product evolution to large-scale platform growth and R&D functions inside enterprise-level companies.  OUR EXPERTISEEngineering managementAI-powered software developmentAI-based automationGrowth & SEOProduct designProduct managementSRE & DevOpsData Analytics

DevIT Group is a Ukrainian company with over 11 years of expertise in the web industry, specializing in e-commerce solutions. E-commerce is our core focus, and we pride ourselves on knowing the industry inside out. Whether it’s custom app development, advanced integrations, or creating seamless online experiences, we have the skills and experience to bring your vision to life. 🏆 Shopify Partner since 2015💻 150+ passionate experts 💪 🔧  9 own Shopify Apps🌎 Over 550 successful projects for clients worldwide. With a global client base and a proven track record, we’re ready to take on your project and help your business thrive. 💬 Curious or have a project in mind? Drop a message.

Eventyr is a team of technical and business professionals who deliver advanced software development services for different business areas. We aim to build long-term, mutually beneficial relationships with our clients and solve their issues with cutting-edge software solutions. Your business is growing — we are growing together with you. Our company is a member of Sigma Software Group, which unites more than 9000 employees in 11 countries.  

Beskyd Com is a company that has been implementing innovative financial technologies in Ukrainian banking institutions since 2003. Our solutions for electronic banking using local bank cards were widely used even before the entry into the Ukrainian market of such giants as Visa and Mastercard and worked in the National Bank of Ukraine, JSC Oschadbank, Privatbank, and a number of other banks in Ukraine and Moldova. Today, we proudly provide 24/7 operation of the SBON+ platform at JSC Oschadbank, which accepts and processes more than 25% of all utility, budget, and other payments in cash and non-cash form in Ukraine. Since 2019, we have been providing a full range of IT outsourcing and outstaffing services, helping companies effectively develop, maintain, and modernize their software solutions. We involve our specialists at all stages of the development life cycle — from design to implementation and support. Our solutions already support real business processes in the seaport of Senegal, the  bike-sharing system, and the railway infrastructure of Ireland. For five years, we have specialized in developing distributed Web3 applications for DeFi projects based on leading blockchains such as Solana, NEAR Protocol, and others. We integrate artificial intelligence into decentralized applications (dApps), create AI bots to automate complex business processes, and develop smart contracts of any complexity — from MVP prototypes to scalable and reliable systems.