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Data & AI Background
Full-stack Development

From Idea to
Scalable Product

We design, build, and operate production-ready web and mobile apps. Frontend, backend, cloud, and integrations - covered.

Build with us

About us

Polar Night Software is a Finnish-Polish consultancy building modern applications from frontend to backend. Our full-stack team delivers products that combine clean design, scalable architecture, and seamless integrations.

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Driving Business Through Software

Behind every product is a measurable result: faster launches, smoother operations, stronger customer experiences. Our case studies highlight how full-stack development translates directly into business growth.

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Valued by clients

Our Achievements in Numbers

Our numbers are drawn from client feedback and internal delivery records. They show how we operate in production: predictable releases, durable relationships, and teams with the experience to keep systems stable.

Clients recommend us

95%

Projects delivered

40+

Avg. years of experience per engineer

9+

Client retention rate

70%
“Polar Night Software’s consultants have been doing a good job and communication with the business people is smooth. We are aiming for a long cooperation.”
Renta
Joel Särkkä, CIO
Renta

Web & Mobile Applications

From dashboards to consumer apps, we build products that feel smooth, look modern, and stay fast as your user base grows. Whether it's a lightweight MVP or a large-scale enterprise platform, our applications are designed for performance, security, and growth.

  • Cross-platform development with React, Next.js, and React Native

  • Mobile apps for iOS and Android, optimized for user experience

  • High-performance web apps optimized for SEO and accessibility

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API & System Integrations

Your product rarely lives on an island - it needs to talk to other systems, services, and platforms. We specialize in building APIs and integrations that make your tools work together seamlessly, ensuring data flows reliably across the stack.

  • REST and GraphQL API design, implementation, and documentation

  • Third-party integrations (payments, CRMs, ERPs, analytics platforms)

  • Authentication and identity management (OAuth, SSO, JWT)

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Databases & Architecture

The hidden engine of every product is its architecture. We design backends and databases that scale with confidence, so your app doesn't just work today - it works five years from now. From data models to system reliability, we engineer for growth from day one.

  • SQL & NoSQL databases (PostgreSQL, MongoDB, Redis, MySQL)

  • Scalable backend architectures with Node.js, Django, or .NET

  • Secure data handling and compliance (GDPR, HIPAA-ready architectures)

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“Polar Night Software has been instrumental in our success. Their expertise in software development has helped us scale our operations and deliver exceptional value to our clients.”
Efecte
Topias Marttila, CTO
Efecte

Need fullstack development expertise?

Ready to build scalable web applications, robust APIs, or modernize your existing systems? Our fullstack team can help you create solutions that grow with your business.

Tel: (+358) 45 321 6766
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Aku Kajan, Commercial Director

Aku Kajan

Commercial Director

Technologies we use

Leveraging the most advanced and proven technologies in artificial intelligence, machine learning, and data engineering to deliver cutting-edge solutions

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