14 Best API Integration & Development Agencies in Sweden for 2026

Many organizations struggle to connect modern cloud services with decades-old backend systems, resulting in slow development cycles, security gaps, and duplicated data across platforms. That makes choosing an API integration and development partner who can design scalable architectures, enforce API security and data privacy, and coordinate complex migrations a business-critical decision.
When evaluating agencies, compare technical capabilities, API design and documentation practices, security and compliance processes, experience with legacy system integration, testing and automation, support and maintenance commitments, delivery models, and transparent pricing and timelines. SoftPro is the featured international partner leading this list and serves buyers in Sweden and across the region for API integration and development projects.

1. SoftPro

As the featured international partner on this list, SoftPro is recommended for readers in Sweden seeking reliable API integration and development support from a Warsaw-based European provider. The company is suited to mid-market and enterprise clients that need custom API development, complex system integrations, cloud migrations and cross-border delivery for projects run with Swedish teams.

SoftPro combines Microsoft-stack engineering with full-stack delivery, working with, .NET Core and C#, and deploying solutions on Microsoft Azure to support enterprise CMS migrations and API-first architectures. The team oversees development, project management, quality assurance and long-term maintenance for production systems.

Key Highlights

• Implemented Umbraco CMS projects and migrations demonstrated in client references.
• Cloud-native development and migration experience on AWS.
• Frontend and backend work using React and for responsive web applications.
• Multilingual website and published blog posts in 2026, indicating outreach across European markets.

Services

• 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. Xware AB

Xware AB develops and maintains xTrade, an integration hub that links systems via messaging, APIs, and transactional interfaces. The platform converts and routes information between disparate enterprise systems and business processes to form a central integration hub.

xTrade uses a modular architecture intended to reduce on-site consultancy while enabling connections between legacy and modern systems. Xware also provides local support, training, and workshops to help teams deploy and operate integrations.

Key Highlights

• Current product release listed on the site: xTrade 4.10.10.
• Customers named on the site include Försvarsmakten (the Swedish Armed Forces) and FMV (the Swedish Defence Materiel Administration).
• The site states that one of Europe’s largest VAN services uses xTrade as its sole technical platform.
• The company is noted on the site as being acquired by WiseTech Global.

Services

• xTrade integration platform
• System integration (APIs, messaging, transactions)
• Support & maintenance
• Training & workshops

Contact Information

Website: xware.se

Phone: 08 54542000

Fax: 08 54542010

Email: info@xware.se

Address: Xware AB, Vasagatan 28, 111 20 Stockholm, Sweden

3. HiQ

HiQ is a Sweden-based Software First engineering group that builds production-ready systems and real-time platforms with an emphasis on sound architecture and engineering discipline. Their work spans cloud delivery, DevOps pipelines and product-grade software that operates in production.

That technical foundation and cross-industry delivery capability make HiQ a fit for API integration and development projects that must connect cloud services, enterprise backends and device ecosystems. HiQ supports long-term platform operations from regional Swedish offices and a wider European engineering organisation.

Key Highlights

• Product portfolio on the official site includes the HiQ Graph digital twin platform and Thellio cloud IoT platform.
• The homepage states HiQ has about 1,500 tech employees and multiple offices across Europe.
• Customer logos shown on the site include public and enterprise names such as Skatteverket, Scania and Volvo.
• The site lists Atlassian & Collaboration Solutions and describes HiQ as an Atlassian partner for enterprise tooling and collaboration.

Services

• Atlassian & Collaboration Solutions
• Cybersecurity & Risk Management
• Digital Platforms & Design

Contact Information

Website: hiq.se

Phone: +46 8 588 900 00

Email: info.stockholm@hiq.se

Address: Industrigatan 5, 582 77 Linköping; Box 4046, SE-102 61 Stockholm, Sweden

4. Knowit

Knowit is a Swedish digital consultancy that designs and implements system integrations, API development and API lifecycle management across cloud, hybrid and on‑premise environments. Their teams deliver API‑first, event‑driven and microservice architectures to enable real‑time data flows and scalable integrations.

The company also builds integration products and sector platforms that demonstrate delivery at scale. Examples include Signport, a REST‑API driven e‑signature service, and Bank Connect, a finance integration platform built for ISO 20022 and real‑time APIs.

Key Highlights

• Signport’s APIs are delivered with Swagger documentation and are implemented to align with DIGG’s technical framework for Swedish public e‑services.
• Knowit is Sweden’s largest Tableau partner and the only certified Tableau training partner in Sweden.
• Testing and quality tooling for API and web verification includes Postman, ReadyAPI, Playwright and Selenium and these tools are integrated into CI/CD practices.
• Knowit partners with Denodo to provide data virtualization and hybrid/multicloud data integration capabilities.

Services

• API platform products
• Integration architecture & middleware
• Real‑time / event‑driven integration
• API testing & CI/CD

Contact Information

Website: knowit.se

Phone: 08 700 66 00

Email: info@knowit.se

Address: Box 3383, 103 68 Stockholm, Sweden

5. Techknight

Techknight is a Stockholm-based digital agency that combines web, mobile and custom software development with IT operations and staffing to deliver end-to-end digital products for enterprises and growth companies.

Their integrated delivery model, where developers, operations and support work together, lets them own API integration projects from design through production and ongoing maintenance.

Key Highlights

• Techknight is ISO 27001 certified for information security.
• The company is an AWS partner focused on cloud architecture and operations.
• Techknight reports a 99.9% average uptime for its managed hosting and monitoring services.
• The firm has completed over 100 delivered projects across web, app and custom systems.

Services

• System integration
• API development
• Cloud (AWS) architecture
• IT operations

Contact Information

Website: techknight.se

Phone: 08 932 299

Address: Kronoborgsgränd 13, 164 46 Kista

6. Visionmate

Visionmate builds bespoke integration layers and middleware that connect enterprise systems to reduce manual data handling and create a cohesive system landscape. The team focuses on scalable automation and partner portals that keep integrations stable in production over time.

Their delivery approach prioritises measurable business value and long-term operability when working with mid-size and large organisations. Visionmate applies this approach across web and app projects to ensure integrations support real-time data flows and operational continuity.

Key Highlights

• Implements REST and SOAP APIs, webhook-based real-time flows, and API features such as authentication, rate limiting and versioning.
• Supports EDI standards EDIFACT and ANSI X12 and integrates with ERP platforms including, Microsoft Dynamics 365 Business Central and SAP.
• Announced as the technical supplier for Swedac’s websites and integration work on January 24, 2025, including handling integrations with Swedac public APIs, Matomo and Siteimprove.
• Client references shown on the site include Visma, Loomis, Renault and Klarna, and published case work covers complex e-commerce logistics and cross-border cash-handling flows.

Services

• Web & App Development
• System integrations & API development
• AI training
• SmartSync

Contact Information

Website: visionmate.se

Phone: +46 8 510 50 250

Address: Fridhemsgatan 45, 112 46 Stockholm

7. Swedwise

Swedwise is a Swedish IT firm that automates business processes and manages enterprise information by combining system integration, service management, and content management. It builds API-first integrations and modernises legacy EDI flows into RESTful APIs to connect ERPs, partners, and microservices across enterprise landscapes.

Delivery focuses on API lifecycle management, microservice wrappers for existing integrations, and an application-network approach that shortens partner onboarding and sustains production integrations. The company pairs consultancy, software licences, and support to maintain integrations in regulated, data-heavy sectors.

Key Highlights

• Swedwise is an official MuleSoft partner with certified expertise in the Anypoint Platform.

• The company implements OpenText solutions, including Extended ECM and Exstream, and delivers integrations using REST APIs and CMIS.

• Swedwise was founded in 2010 and maintains offices in Karlstad, Stockholm, and Uddevalla.

• Storskogen acquired an 82% stake in Swedwise in March 2022.

Services

• API Integration

• System Integration

• Information Management

• Customer Communications Management

Contact Information

Website: swedwise.com

Phone: +46 54 13 63 00; Support: +46 54 13 63 02

Address: Invoice Address — Swedwise AB, Fack 517, Box 3037, 831 03 Östersund; Offices — Järnvägsgatan 7, 652 25 Karlstad; S:t Eriksgatan 46, 112 34 Stockholm; Agnebergsgatan 2, 451 30 Uddevalla

8. CombinedX

CombinedX is a Stockholm-based group of wholly owned specialist companies that helps organizations capture value from digitalization across the Nordics through coordinated delivery. The group presents its capabilities as a combined portfolio of specialist firms that route work through focused teams and shared governance.

The group's platform and technology page lists cloud, ERP and automation vendors, including Amazon Web Services, Microsoft, ServiceNow and UiPath, and the group channels work through its specialist firms. This positioning suggests it can support API-driven, system-to-system development across enterprise landscapes.

Key Highlights

• Public company; IPO completed in 2022.

• Q4 2025 report notes the group reached its SEK 1 billion revenue milestone.

• Head office listed as c/o Netgain, Sankt Eriksgatan 63B, 112 34 Stockholm.

• Contact email published on the site as [email protected].

Services

• Application development

• ERP & business process

• Automation & RPA

Contact Information

Website: combinedx.com

Address: c/o Netgain, Sankt Eriksgatan 63B, 112 34 Stockholm

9. Netlight

Netlight is an international digital consultancy that architects and implements API-first platform solutions for enterprise clients, moving designs from strategy into production. Their teams combine software engineering, cloud-native infrastructure (Kubernetes) and product expertise to build scalable API gateways and integrations for payment, logistics, and automotive customers.

Netlight delivers either embedded individual consultants or cross-functional, full-service teams to own API architecture, testing, and rollout across product lifecycles. Official case stories on the company site describe building serverless data pipelines and API-first platform architectures that enable near-real-time integrations and scalable validation.

Key Highlights

• Founded in 1999 with origins in Stockholm, Sweden.

• Operates 16 offices across 11 countries.

• More than 2,200 consultants in its global network.

• Recognised Google Cloud partner with 34+ certificates and GCP-certified consultants listed on the official partnership page.

Services

• Data Engineering

• Product Consulting

• Cybersecurity

Contact Information

Website: netlight.com

Phone: +46 8 616 99 40

Email: info@netlight.com

Address: Regeringsgatan 25, 111 53 Stockholm, Sweden

LinkedIn: linkedin.com/company/netlight-consulting

10. Rillion AB

Rillion is a cloud-based accounts payable automation platform that combines AI-native invoice capture, configurable approval workflows, and automated payment reconciliation to streamline invoice-to-pay operations for mid-sized and large organizations. The platform presents a SaaS delivery model built for multi-entity setups and finance teams that need predictable, scalable invoice processing without heavy manual intervention.

Because Rillion is built to integrate with existing ERPs and backend systems, it suits API integration and development projects where teams must connect invoice, approval, and payment data to corporate systems. The company publishes integration tooling and documentation that enables partners and integrators to extend workflows and map data between Rillion and client systems.

Key Highlights

• Pre-built integrations include Microsoft Dynamics 365 Finance, Microsoft Dynamics 365 Business Central, Oracle NetSuite, SAP Business One, Sage X3, and Sage Intacct.

• The Rillion integration engine and published specifications support standard interfaces and APIs (SOAP, REST, text, XML) and include a user-facing integration interface for mapping and data flows.

• The site states Rillion is used by 30,000+ organizations and processes around 40 million invoices per year.

• Rillion has been backed by Altor since 2021 and lists a headquarters in Stockholm with regional offices in the US, Denmark, and Finland.

Services

• Implementation & Professional Services

• Customer Success Management

• Payments (US only)

Contact Information

Website: rillion.com

Phone (Support, North America): +1 773 887 6100

Phone (Support, Scandinavia/EMEA): +46 10 198 97 00

Email (Sales): salesoperations@rillion.com

Email (Billing): finance@rillion.com

Email (Privacy): privacy@rillion.com

Address (Sweden HQ): Sveavägen 13, 111 57 Stockholm, Sweden

Mailing address: Box 7025, 103 86 Stockholm, Sweden

Address (Denmark): Hørkær 20 st., 2730 Herlev, Denmark

Address (Finland): Bulevardi 21 B 7, 00180 Helsinki, Finland

Address (USA): 305 E. Huntland Drive, Suite 200A, Austin, TX 78752, USA

11. Exsitec

Exsitec is a Swedish IT consultancy that designs and maintains API-driven integrations between ERP, business intelligence and operational systems to improve automation and data quality. The company aligns integration delivery with business processes to reduce manual work and accelerate digitalisation efforts.

It delivers integrations on a Microsoft Azure–based platform and operates a managed integration service with a web-based integrations portal that provides real-time visibility and proactive fault detection. This combination of a cloud platform, managed operations and integration delivery makes Exsitec a fit for API integration and development projects in Sweden.

Key Highlights

• Has built over 500 integrations to more than 100 different systems.

• Lists 600 experts in its organisation.

• Publishes a public integration price calculator to estimate project costs.

• Offers BI products including Qlik Cloud, Qlik Sense, QlikView and Microsoft Power BI and Microsoft Fabric.

Services

• Systemintegration

• Integrationsplattform

• Applikationsutveckling

Contact Information

Website: www.exsitec.se

Phone: 010 - 333 33 00

Email: hej@exsitec.se

Address: Storgatan 24, 582 23 Linköping

12. Fourmation

Fourmation is a Gothenburg-based consultancy focused on integration, connectivity, APIs, and modern software development. The firm assembles senior architects and developers to design scalable integrations, build APIs, and deliver cloud-native applications.

Its delivery emphasizes practical, sustainable engineering across cloud platforms and containerized environments. That combination of integration expertise and API-first delivery makes Fourmation well suited for API integration and development projects in Sweden.

Key Highlights

• The team reports a combined experience of over 100 years in integration and software projects.

• Explicit expertise with Mule ESB and IBM WebSphere for legacy integration scenarios.

• Hands-on experience with IoT protocols, listed specifically as MQTT.

• Company registration number shown as 559037-4376 on the official site.

Services

• Mule ESB implementations

• IBM WebSphere integration & migration

• IoT & MQTT integration

• API Management & gateways

Contact Information

Website: fourmation.se

Phone: +46 (0)31 13 14 80

Address: Götabergsgatan 2, 411 34 Göteborg

13. KITS AB

KITS AB builds modern, maintainable digital systems with a strong emphasis on integrations and API work that connect ERP, e‑commerce, IoT and cloud platforms. The company pairs system development with security practices to ensure solutions are clear to operate, resilient and aligned with business goals.

KITS staffs engagements with consultants who augment client teams or take full responsibility for deliveries under technical leadership. Their delivery approach and packaged services make them a practical choice for API integration and development projects that require both implementation and operational security.

Key Highlights

• Founded in 2013 and structured as an employee-owned consultancy.

• Roughly 40 employees reported on the company careers site, with an indicated annual revenue of about 50 MSEK.

• Offers packaged services that include penetration testing and ongoing OT security support with references to NIS2 and IEC 62443 compliance.

• Explicit cloud and application security work covering AWS and Azure environments.

Services

• System architecture

• Technical project & delivery leadership

• Cloud-native development

• Application security training

Contact Information

Website: kits.se

Phone: 0730 – 74 07 18

Phone: 0708 – 27 74 99

Email: info@kits.se

Email: johan.herbo@kits.se

Email: patrik.nilsson@kits.se

Address: Kungsportsavenyen 33, 411 36 Göteborg

14. Kontek

Kontek is a Swedish payroll and HR technology and services firm that delivers software and managed services for payroll, time reporting, recruitment and personnel administration. Customers can choose self-service systems, full outsourcing, or hybrid delivery to match their operational needs.

The company is a fit for API integration and development coverage because its platform is built to connect payroll workflows with external data sources and regulatory interfaces while supporting automation and operational delivery models. Kontek pairs platform capabilities with human-led support to help customers onboard and maintain integrations in live payroll processes.

Key Highlights

• ISO 27001:2022 certification for information security.

• First to integrate SCB’s new API into its payroll system, enabling automated regulatory reporting.

• Introduced "Kontek Byrå", a tailored concept for accounting and payroll bureaus to scale with control.

• Public site showcases notable customers including BabyBjörn, Castellum and Blåkläder.

Services

• Kontek Byrå

• Min Lön

• Min HR

• Outsourcing

Contact Information

Website: kontek.se

Email: info@kontek.se

Address (Ljungby): Box 193, 341 24 Ljungby

Address (Stockholm): Västra Järnvägsgatan 7, 111 64 Stockholm

Address (Göteborg): Fabrikstorget 1, 412 50 Göteborg

Address (Växjö): Sambandsvägen 5A, 352 36 Växjö

Address (Helsingborg): Rönnowsgatan 8B, 252 25 Helsingborg

Address (Malmö): Neptunigatan 82, 211 18 Malmö

Conclusion

SoftPro is the featured partner on this list and is recommended for readers in Sweden seeking reliable API integration and development support from a Warsaw-based European provider.
When choosing among providers, weigh whether you need local presence for on-site collaboration or an international partner for capacity and cross-border projects. Prioritize vendors that can demonstrate API-first or event-driven architecture and that can work in your repositories and CI pipelines to ensure maintainable delivery. Match provider experience to your domain needs, for example ERP, payroll, or accounts-payable automation, and confirm support, security practices, and ownership of integration artifacts before committing.