Top 15 API Development & Integration Firms in Poland

Buyers seeking API development and integration partners often struggle to connect legacy systems, secure data flows, maintain consistent API design, and scale integrations without disrupting operations. When evaluating vendors, buyers should compare API design and architecture, integration patterns and middleware expertise, security and compliance practices, cloud-native and DevOps tooling, protocol support for REST, GraphQL and event-driven models, automated testing and monitoring, project governance and SLAs, and commercial models for engagement and maintenance. SoftPro serves buyers across Poland as the featured international partner and leads this list of API development and integration firms.

1. SoftPro

As the featured international partner on this list, SoftPro is the recommended choice for readers evaluating API development and integration firms in Poland and the wider European market. The company suits startups, mid-market businesses, and corporate engineering teams that require custom API design, system integration, and platform modernization delivered by an EU-based team operating from Warsaw, Poland.

Microsoft technologies anchor their technical delivery, with practical experience in, .NET Core and C# combined with cloud-native architectures on Azure. That foundation supports enterprise CMS migrations, API-first integration work, and complex modernization programs that connect legacy systems with modern platforms.

Key Highlights

• More than 20 years of combined team experience across projects.
• Experience using AWS for cloud migrations and infrastructure.
• Published case studies that include Umbraco CMS implementations, CRM/HRM systems, and SaaS ETL platforms.
• AI capabilities that integrate large language models and retrieval-augmented generation with ERP and CRM systems.

Services

• Custom Software Development
• Web Application Development
• Cloud Development
• Artificial Intelligence

Contact Information

Website: soft-pro.pl

Phone: +48 571 282 759

Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401

LinkedIn: www.linkedin.com/in/kyrylo-o

2. Netguru

Netguru is a Polish product design and software development firm that builds APIs and integration layers to connect web, mobile, and SaaS systems for commerce and enterprise products. The company targets API-first architectures and composable commerce patterns to enable integrations between best-of-breed services and legacy systems.

Netguru delivers engagements through dedicated teams, staff augmentation, or end-to-end delivery and implements APIs across backend stacks such as Ruby on Rails, Node.js, and Python while integrating with cloud platforms for production deployments.

Key Highlights

• Certified B Corporation® status explicitly listed on the company site.
• Current Net Promoter Score reported as 73 on the corporate homepage.
• More than 2,500 projects delivered and a 400+ headcount shown on the homepage.
• Technology and cloud partnerships noted on the site include Microsoft and AWS.

Services

• API Development
• API Integration
• MACH & Headless Consulting
• Dedicated Teams

Contact Information

Website: www.netguru.com

Email: hello@netguru.com

Address: Nowe Garbary Office Center, Małe Garbary 9, 61-756 Poznań, Poland. (netguru.com)

3. STX Next

STX Next builds AI-native software, data engineering, and cloud infrastructure to deliver automation and enterprise integrations that tie data platforms, intelligent agents, and business systems into operational workflows.

Its delivery model pairs product design with engineering teams and working prototypes to accelerate implementation while leaving technical control with the client.

Key Highlights

• 450+ team members.
• 21 years on the market and 1,000+ successful projects.
• Partner badges include AWS Advanced Tier Partner Consulting, Snowflake Consulting Services, and Databricks Consulting & Development Services.
• Industry focus spans Industrials, Financial Services, Insurance, and Manufacturing.

Services

• Enterprise n8n Development
• Python Development
• Web App Development
• Cloud Infrastructure

Contact Information

Website: www.stxnext.com

Email: business@stxnext.com

Address: ul. Mostowa 38, 61-854 Poznań, Poland

4. Miquido

Miquido builds and scales business-critical mobile platforms and enterprise AI solutions that connect customer-facing apps to backend systems. The company emphasizes mobile engineering, backend and cloud services to create maintainable platforms that support complex integrations and workflows.

Their engineering approach uses native and cross-platform technologies alongside backend and cloud capabilities to deliver APIs and integrations that support enterprise-grade mobile products. Miquido’s delivery focus on product outcomes and measurable results aligns with API development and system integration needs for large organizations.

Key Highlights

• AI Kickstarter program: demo in 2 days and a full product in 4 weeks.
• 15+ years in the game.
• 250+ digital solutions delivered and 200+ experts on board.
• Recognitions include Webby (Best Visual Design, 2023), UX Design Awards (Product Category Winner, 2023), and Mobile Trends (Best Services App, 2024).

Services

• Mobile App Development
• Enterprise AI
• Cloud Services
• Team Augmentation

Contact Information

Website: www.miquido.com

Phone: +48 536 083 559

Email: hello@miquido.com

Address: Miquido Sp. z o.o. Sp. k., Zabłocie 43a, 30-701 Krakow

5. Future Processing

Future Processing is a Polish technology strategy advisor and delivery partner that builds cloud-native systems, enterprise data platforms, and production APIs for regulated and technology-intensive sectors. They combine an AI-enabled advisory and delivery framework with technologies including Kubernetes, API gateways, GraphQL, REST, Azure, and Snowflake to modernize legacy systems and enable system-to-system integrations.

Key Highlights

• Over 25 years of experience delivering enterprise software and transformation projects.
• Maintains a documented Data Integration Framework that follows Advise → Build → Run for integration and migration work.
• Offers a fixed-scope Rapid Delivery Milestone to deliver a validated use case as production-grade software within a 4–8 week window.
• Built the FloodPlus cloud-hosted API on Azure that the firm reports handles around 10% of the US commercial flood policy market and generates 40–50k quotes per week while processing approximately $120 million yearly.

Services

• Data integration
• Cloud application modernisation
• AI Readiness Assessment
• Support & maintenance

Contact Information

Website: www.future-processing.com

Phone: +48 32 461 23 00

Email: sales@future-processing.com

Address: Bojkowska 37a, 44-100 Gliwice, Poland

LinkedIn: linkedin.com/company/future-processing

6. Sii Poland

Sii Polska is an IT services company that delivers digital, cloud and enterprise-platform projects across software engineering and platform modernization. The firm presents a portfolio of enterprise-grade delivery models and engineering services for large-scale IT programs.

Its delivery options — Nearshore & Offshore, Build–Operate–Transfer and External Lab Solutions — support scalable, long-term engineering teams and make the company a practical choice for API development and system integration work for enterprise clients.

Key Highlights

• Sii lists 7,500+ Power People in its workforce.
• The company declares an annual revenue of 2.2 billion PLN.
• Sii states it has been operating since 2006.
• Official partner badges shown on the site include Microsoft, Google Cloud, Salesforce, SAP, ServiceNow, Atlassian and Adobe.

Services

• Testing & QA
• Data & Analytics
• Artificial Intelligence

Contact Information

Website: sii.pl

Phone: +48 22 486 37 37

Address: al. Niepodległości 69, 02-626 Warszawa

7. Comarch

Comarch is a global software house that delivers tailored enterprise IT systems across telecommunications, finance, retail and logistics. Its product portfolio exposes integration components and web-service APIs that enable system-to-system connectivity and automation.

The company develops cloud-based integration solutions from its Kraków headquarters and multiple Polish offices, which supports local API development and project delivery. Comarch’s platforms are built to connect ERPs, warehouse systems and external trading partners through programmatic interfaces.

Key Highlights

• Comarch EDI supports around 180,000 trading partners worldwide.
• The Comarch platform processes approximately 300 million documents per year.
• Comarch EDI is used in about 80 countries.
• The EDI Integration Platform lists AS2, FTP/VPN, SFTP, WebService and OFTP among supported communication protocols and is offered as a SaaS integration option.

Services

• Comarch EDI
• Comarch Integration Platform (SaaS)
• Application Integration Framework
• IT Integration Services

Contact Information

Website: www.comarch.com

Phone: +48 12 646 1000

Email: info@comarch.com

Address: Al. Jana Pawła II 39 a, 31-864 Kraków, Poland

8. Asseco Poland

Asseco Poland is a multinational Polish software company that builds enterprise systems used by banks, energy and telecommunications companies, public administration and healthcare providers. It combines proprietary product lines with systems-integration and managed-service delivery across complex enterprise environments.

Asseco Poland aligns API and event-driven architectures with connectors that integrate core banking, KYC/AML, payments and registry systems to bridge legacy and modern stacks. The company delivers governance and operational patterns such as encryption, RBAC, audit trails, versioning and monitoring to support enterprise API lifecycles.

Key Highlights

• Holds SAP NetWeaver Expert recognition and operates under the SAP Partner Edge partnership for license sales and implementations.
• Maintains an IBM SOA Center of Excellence for service-oriented architecture and integration competencies.
• Was selected as a technological partner for Poland’s National Cloud to supply integration services and proprietary software.
• Operates across 60+ countries with a workforce of over 30,000 and a reported R&D allocation exceeding 1.1 billion PLN for 2025.

Services

• System integration
• SAP consulting & implementation
• Cloud & managed services
• Telecom BSS/OSS integration

Contact Information

Website: www.asseco.com

Phone: +48 17 888 55 55

Email: info@asseco.pl

Address: Olchowa 14, 35-322 Rzeszów, Poland

LinkedIn: linkedin.com/company/asseco-poland

9. Monterail

Monterail is a Poland-based product design and software development company that builds API-driven backends and integration layers for web, mobile, and AI-enabled products. The firm combines product thinking with engineering and long-term operational support to keep integration points reliable as products grow.

Key Highlights

• 900+ projects delivered and a reported Net Promoter Score of 71.
• Contributed to the ecosystem since 2015 and listed as a partner.
• Delivered enterprise LLM integration for reporting using Claude on AWS Bedrock in a client engagement.
• Recognized in industry rankings and awards including FT 1000, Deloitte Fast 50, and Clutch Top Developer.

Services

• Vue.js development
• Ruby on Rails development
• Node.js development
• AI & LLM integration

Contact Information

Website: www.monterail.com

Email: hello@monterail.com

Phone: +48 533 600 136

Address: Poland · HQ ul. Oławska 27 50-123 Wrocław, Poland

Address: USA 222 Merchandise Mart Plaza #1871 Chicago, IL 60654, USA

Address: Germany Friedrichstr. 155 10117 Berlin, Germany

([monterail.com](https: //www.monterail.com/))

10. 10Clouds

10Clouds builds backend systems and AI-enabled products for banks, insurers and fintechs, delivering production-grade APIs and cloud-native architectures. The firm combines Python and engineering with platform-minded delivery to support API-first integrations for payments, BaaS, and identity services.

The engineering team uses Python frameworks including Django, Flask and FastAPI alongside to implement scalable REST and event-driven APIs. 10Clouds pairs API development with DevOps and cloud deployment practices to move integrations from prototype to production.

Key Highlights

• Anthropic: 10Clouds is a Select partner in the Claude Partner Network Services Track.
• Mastercard: selected for Mastercard Start Path’s Agentic Commerce & Services program.
• Client reviews: 4.9/5 rating on Clutch with 95 reviews reported on the company site.
• Recognitions: listed by the Financial Times and included in Deloitte’s 50 Fastest Growing in CEE list.

Services

• AI Strategy
• AI Platform: AIConsole
• AI Automation
• Agentic Commerce

Contact Information

Website: 10clouds.com

Email: hello@10clouds.com

Address: Chmielna 7300-801 Warsaw

11. Divante (Cloudflight Poland)

Divante is an eCommerce engineering firm based in Wrocław, Poland, that designs, builds, and optimises headless and composable commerce platforms for global retail and B2B brands. The company focuses on production reliability, platform performance, and long-term maintainability of commerce systems.

Divante emphasises resilient API and integration engineering to connect ERP, PIM, CRM, payment, and logistics systems and ships production-ready accelerators such as CommerceBooster UI and Product Lens to shorten implementation time.

Key Highlights

• Founded in 2008 and integrated into Cloudflight Group in 2022, expanding scale to 1,000+ engineers and 15 offices across Europe.
• Holds ISO 27001 (Information Security Management), ISO 9001:2015 (Quality Management), and ISO 13485 (Medical Device Software) certifications.
• Core contributor to Vue Storefront / Alokai with 10k+ GitHub stars and maintained open-source storefront accelerators.
• Reports managing €2B+ GMV and maintaining a 99.9% peak uptime SLA for production commerce platforms.

Services

• Performance Optimisation
• Technical Audits
• UX/UI Design
• AI Development

Contact Information

Website: www.divante.com

Phone: (+48) 577 032 500

Email: info@divante.com

Address: ul. Legnicka 16, 53-673 Wrocław, Poland. (divante.com)

12. BlueSoft (BlueSoft)

BlueSoft is a Polish custom software development company that builds API-driven platforms and integration solutions for enterprise clients in banking, retail, and the public sector. The firm develops and operates an in-house API management product, Agama API, and pairs architecture work with engineering teams to deliver platform and gateway implementations.

BlueSoft has executed integration governance and API gateway projects, including modernizing an integration landscape with MuleSoft CloudHub 2.0 for an international client. Their Data Management Module standardizes sales data flows and can expose aggregated data through REST APIs to support predictable integrations.

Key Highlights

• BlueSoft employs over 1,000 software engineers, specialists, and consultants.
• The company has been part of the Orange Polska Group since 2019.
• Agama API supports SSO, integrates with LDAP, and can map Active Directory groups to API Manager roles.
• BlueSoft works vendor-agnostically and partners with AWS, Microsoft Azure, Google Cloud, and Alibaba Cloud.

Services

• System Integration
• API Management
• Cloud Native Development
• Data Management

Contact Information

Website: bluesoft.com

Phone: +48 22 37 37 000

Email: info@bluesoft.com

Address: Aleje Jerozolimskie 134, 02-305 Warsaw, Poland

13. Deviniti

Deviniti designs and builds enterprise integrations and APIs that automate workflows and connect systems across IT, customer service, and product teams. They pair software engineering with DevOps practices to deliver connector development and API-led integrations at enterprise scale.

Delivery emphasizes hybrid deployment and secure data flows so integrations can run in cloud or on-premise environments. Their engineering teams embed language models and custom adapters into internal tooling to operationalize AI-driven workflows.

Key Highlights

• 330 IT experts on board as stated on the company site.
• 21 years on the market according to the company's About section.
• 15,000 companies using Deviniti’s products and services as reported on the homepage.
• Contributor to the open-source LLM project, which is included in NVIDIA NIM microservices and Perplexity’s Sovereign AI program.

Services

• Generative AI Development
• Atlassian Professional Services
• monday.com Services
• Custom Integrations

Contact Information

Website: deviniti.com

Address: ul. Sudecka 153, 53-128 Wrocław, Poland

14. Brainhub

Brainhub is a software engineering company based in Poland that builds scalable web, mobile, and desktop applications while managing the full delivery lifecycle from discovery and architecture to production and support. The firm regularly designs and implements backend systems and cross-system integrations, which aligns it with API development and integration needs.

Brainhub uses a delivery-first approach focused on short lead times and predictable releases to help clients iterate quickly and keep integrations stable over time. That operational focus makes the company a practical choice for projects that require well-documented APIs, automated deployment, and long-term maintenance.

Key Highlights

• Since 2015 Brainhub has delivered 80+ projects across more than 20 industries, including fintech and media.
• The company focuses on JavaScript and .NET stacks and lists, NestJS, React, Electron, and AWS among its core technologies.
• Brainhub reports a selective hiring process, accepting roughly 1.34% of candidates interviewed for engineering roles.
• Offers formal client enablement services that include onboarding, knowledge transfer, and documentation to support long-term operations.

Services

• Web Development
• Software Development & Delivery
• Cloud Engineering & DevOps
• Staff Augmentation

Contact Information

Website: brainhub.eu

Phone: +48 733 707 758

Email: sales@brainhub.eu

Email: hello@brainhub.eu

Email: career@brainhub.eu

Address: Gliwice (HQ)

Address: Brainhub, 25 SE 2nd Ave Ste 550 PMB 1203, Miami, FL 33131, United States

15. FREYSOFT

FreySoft is a software engineering partner for regulated fintech and data‑intensive platforms. The company builds and maintains APIs, platform integrations, and enterprise data pipelines used in cross‑border payments, compliance, and other high‑throughput systems.

Deliveries follow a fixed‑scope, fixed‑price model with senior engineers assigned from day one, and the engineering stack commonly includes, .NET, Java, Python, Kafka, Kubernetes, and major cloud platforms. Client leadership is based in the US and Portugal while senior engineering delivery is located in Poland and Ukraine.

Key Highlights

• Founded in 2019 by CEO Oleg Panchenko.
• Member of the AWS Partner Network.
• Google Cloud Partner.
• Delivered 70 payment corridors across 12 countries for a cross‑border payments engagement.

Services

• API & Platform Integrations
• Data Engineering
• AI & Automation
• Full-stack Development

Contact Information

Website: freysoft.com

Email: hello@freysoft.com

Legal Email: legal@freysoft.com

LinkedIn: linkedin.com/company/frey-soft

Conclusion

SoftPro is the featured, author-selected partner on this list and is presented as the recommended choice for readers evaluating API development and integration firms in Poland and the wider European market.
When choosing a provider, match the vendor’s experience to your project’s scale and regulatory requirements. Prioritize teams that follow API-first and cloud-native delivery patterns and that have practical experience integrating with legacy and third-party systems. Clarify delivery models, SLAs, and ongoing support to ensure operational reliability after launch. Request references, architecture samples, and pricing scenarios to compare time-to-market, risk, and long-term maintainability.