Top Kotlin Development Companies

For over a decade, we’ve helped leading brands launch 400+ digital products. Our expertise spans product strategy, UI/UX design, and software development. We believe no great venture should be held back by execution. That’s why we lead with strategy, work as true partners, and build products that scale. We help you define the right thing to build then design, develop, and launch it with clarity and purpose. Our partners have raised over $1B in funding—and counting.

The Blue Box

Your partner for automate intelligently. Scale confidently. Build beyond apps.

5.0(3)

5.0

3 reviews

At The Blue Box, we believe software should reduce complexity, automate work, and create real operational leverage. We partner with companies ready to move beyond manual processes and disconnected tools. From early MVPs to scalable platforms, we design and build intelligent digital systems powered by software and AI. Our approach is simple: understand your operations, identify automation opportunities, and build solutions that support long-term growth. No unnecessary complexity. No generic development. Just systems designed to scale. We work as your digital partner, helping you streamline processes, integrate AI thoughtfully, and build platforms that evolve with your business. If your team is spending too much time on repetitive work or struggling with fragmented systems, we can help you transform that into something smarter, faster, and scalable.

Jett Develops

Full-Stack & AI Development Company

5.0(1)

5.0

1 review

Jett is a strategic product design and development company that goes beyond what's expected to achieve businesses' most daring goals.

nextap solutions s.r.o

Your Long-Term Product Engineering Partner

5.0(3)

5.0

3 reviews

We’re a team of developers, designers, and product thinkers who partner with startups and scaleups to build and grow digital products that last. At NEXTAP, we don’t just write code — we become part of your journey. From MVP to millions of users, we’ve helped founders and teams scale with long-term collaboration, fast delivery, and real ownership. Over the past decade, we’ve worked with fintech companies like ClearScore and Bippit, as well as creative platforms such as Steller. We’ve grown teams from a single developer to 15+ people, delivered mobile and web products used by millions, and contributed to apps that were honored with recognition such as Apple’s Best of 2019 and the TravelTech AI Innovator 2024. Our expertise covers native iOS and Android development, modern web applications, and AI — including AI agents, content generation, and much more. No matter the stack, we care about clean solutions, maintainable code, and product decisions that make sense. Based in Czechia and working globally, we believe the best results come from building lasting relationships. We’re not just here to launch your product — we’re here to grow it with you.

April Innovations

Full Stack Enterprise App Development Company

5.0(1)

5.0

1 review

We are a full stack software engineering company with focus on Banking and Fintech applications. We have serviced clients in USA, UK and India. Our core areas of expertise are Enterprise Apps, Artificial Intelligence, Mobile Apps, E-Commerce, Platforms. We have worked on projects that has half a million users and have delivered projects with Bank level security. We prefer to work on micro teams model where we build a micro team for each of our client that acts as an extended tech team for the client.

Vincit

Digital Development and Design Agency with strong AI capabilities

Vincit is a trusted partner for companies like Logitech, Cisco, The New York Times and LTK in developing their digital products and services. With roots in Finland and presence in the US since 2016 we are now over 500 experts ready to serve you. We combine meaningful user experience design to top-tier technical development for mobile, web and cloud. With the use of latest AI tools, we are able to deliver projects more efficiently and help your organization gain AI-Driven-Development capabilities throughout the collaboration. Ask us for free consultation and quote for your project. We are especially interested in challenging projects with established companies.

Eltex Soft

Web Solutions | Mobile Apps | Team Augmentation

At EltexSoft we build custom software solutions, as well as augment existing engineering teams of startups, Fortune 500 and INC 5000 companies. Following business domains are the area of our highest expertise: • Sports, Health & Wellness, Longevity (web+mobile platforms) • Food Delivery (logistics, eCommerce) • Education (matching, CRMs, data management, online learning, LMS) • Medical Technology (HIPAA compliant web and mobile apps) • E-commerce, B2B and B2C marketplaces, payment solutions • HR & Recruiting (matching, CRMs) • Generative AI (storyboards, movie and animation making tools) Why EltexSoft? With decades of individual and team experience, we use best practices and process to make software happen and drive your ROI: • Focus on user experience, delivery and quality • A-players and 10x engineers building best in class apps • Business and values over process and technology • Test coverage, cross code reviews, perfect Ops and CI/CD • Excellence in communications and teamwork

LinkSture Technologies

Bespoke eCommerce & Web Solutions That Drive Growth, Performance, and Long-Term Value

LinkSture is a bespoke eCommerce and web development agency helping brands, startups, and enterprises build scalable digital experiences that drive measurable growth. We specialize in custom Magento, Shopify, WordPress, and WooCommerce development — delivering high-performance, conversion-focused solutions tailored to each client’s business goals. Beyond development, we focus on strategy, UX-driven design, optimization, and long-term technical scalability. Our approach is simple: understand the business deeply, architect the right solution, and execute with precision. What sets us apart: • Performance-first development mindset • Clean, scalable, and maintainable code architecture • Strong focus on UX and conversion optimization • Deep eCommerce expertise across multiple platforms • Long-term partnership approach, not just project delivery We work closely with founders, marketing teams, and agencies worldwide to transform ideas into powerful digital commerce ecosystems. Whether it’s launching a new brand, scaling an existing store, or rebuilding complex infrastructure — LinkSture delivers solutions engineered for growth.

RemoteState

Innovative Transformation of Business with Top-notch Development and Design Solution

RemoteState works in cutting-edge backend and frontend technologies, empowering companies across the globe through innovative solutions and digital transformation. We offer our clients top-notch services that help startups and established corporations alike. Abiding by the principles and best practices of engineering, we serve our clients with the goal of 100% customer satisfaction. RemoteState is growing constantly, in the fields of Mobile App Development, Strategic Consulting, Web Development, Quality Assurance, and even more. We employ a proficient team of seasoned and passionate specialists whose expertise includes a wide repertoire of technologies. Guided by their profound knowledge in niche areas like Go, NodeJs, ReactJs, Kubernetes, Docker, and more, our creative techies constantly work on rich user experience. RemoteState is driven by our passion for innovation and quality as we constantly strive for quick delivery and proactive implementation.

We’re more than a digital agency — we work as an extension of your team. From concept to launch, we design and build products that are functional, intuitive, and aligned with your goals. Since 2014, our focus has been on crafting experiences that feel effortless and meaningful for the people who use them — delivering results that stand out for their clarity and impact.

Requestum is a full-cycle software development company that specializes in transforming business ideas into scalable web and mobile applications. We provide a comprehensive suite of services ranging from initial business analysis to final product support. Core Services Artificial Intelligence: Advanced capabilities in Machine Learning, Computer Vision, LLM (Large Language Model) development, AI Agent creation, and RAG (Retrieval-Augmented Generation) services. Web Development: Custom solutions including CRM systems, marketplaces, SaaS platforms, and ERP software. Mobile Development: End-to-end development for iOS, Android, React Native, and Flutter. Design & Strategy: UI/UX design, business analysis, and a dedicated "Discovery Phase" to define project roadmaps and minimize risks. QA & Testing: Both manual and automated testing to ensure product security and performance. Startup Support: Specialized services for MVP (Minimum Viable Product) and PoC (Proof of Concept) development.

WHY CLIENTS CHOOSE WEELORUM: We're not just another dev shop. We use AI-assisted development to deliver your mobile app faster, with fewer iterations, and at a fraction of the traditional cost. What makes us different: • AI-Accelerated Discovery Phase: 2 weeks instead of 4, same quality, half the cost • Claude AI + Cursor integration: 3x faster prototyping and code generation • Full-cycle delivery: Design → Development → QA → App Store launch • Long-term partnerships: avg 3+ years with our clients (Digiproduct — 5+ years) INDUSTRIES WE SPECIALIZE IN: • HealthTech (HIPAA-aware): Swim-Wise AI wellness platform • FinTech (Secure Payments): Jon D. Rock financial app • Social & Marketplace: Photo Shoot, Dating apps • E-Commerce: GetBooks digital bookstore • White-label for agencies: Digiproduct (5+ years) TECH STACK: iOS (Swift, SwiftUI) | Android (Kotlin, Jetpack Compose) | Flutter | React Native Node.js | Firebase | AWS | AI/ML Integration | Claude AI | Computer Vision OUR PROCESS: 1. Discovery Phase (2 weeks) — Research, wireframes, interactive prototype 2. Design (2–3 weeks) — UI/UX, design system, animations 3. Development (4–8 weeks) — Agile sprints, weekly demos, CI/CD 4. QA & Launch — App Store optimization, release management WHAT CLIENTS SAY: "We felt like collaborators, not clients" — Co-Founder, Social Media Startup "Released the final app in just three months" — CEO, Jon D. Rock "5+ years and counting" — Founder, Digiproduct