Best API Integration & Development Companies in Ireland to Watch

Companies seeking API integration and development often struggle to connect legacy systems with cloud platforms, ensure secure and compliant data flows, and deliver consistent performance and developer experience for internal and external consumers.
When hiring a partner, compare proven API architecture and integration patterns, security and compliance controls, scalability and performance testing practices, quality of developer documentation and sandbox environments, support and service-level agreements, and total cost of ownership. SoftPro is the featured international partner leading this list and serves buyers across Ireland as a provider of end-to-end API design, integration, and delivery expertise.

1. SoftPro

SoftPro is the featured international partner on this list for companies in Ireland seeking API integration and development support and is suitable for mid-market and enterprise projects that require complex system integrations and SaaS platform development. The firm delivers remote software teams and project delivery across European markets and is headquartered in Warsaw, Poland.

The company builds on a Microsoft-focused stack with and .NET Core and applies C# and Azure to deliver enterprise CMS work and manage CMS migrations alongside cloud-native applications. Their delivery model emphasizes backend API development and cloud migration services that create maintainable integration architectures for long-term operations.

Key Highlights

• Over 20 years of combined team experience across delivered projects.
• Published case studies include a business portal, CRM/HRM system, SaaS ETL platform, and a social network for product promotion.
• Frontend and backend capabilities use modern JavaScript frameworks with React and for web applications.
• The company provides ongoing support and maintenance for software it develops to ensure operational continuity.

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. RedStudio

RedStudio is an Irish web design and development studio that builds websites and web applications for commercial and nonprofit clients. The team pairs visual design with engineering to deliver polished, production-ready sites.

They emphasize API-driven workflows and deployment reliability, combining frontend design with backend integration to connect third-party services and automate customer-facing processes.

Key Highlights

• Saol Capital case study notes integrations for e-signatures and APIs.
• A client testimonial cites deployment to AWS and implementation of Stripe integration.
• The site lists free inclusions such as SSL certificates, analytics, WCAG accessibility compliance, privacy and data protection measures covering GDPR and CCPA, daily backups, and monthly performance reports.
• RedStudio lists locations in Dublin, Cork, London, New York, Sydney and Toronto.

Services

• Web Development
• Ecommerce
• SaaS Development
• Mobile App Development

Contact Information

Website: redstudio.ie

3. Aitina Tech

Aitina Tech is an Irish software engineering firm that designs, integrates, and operates enterprise-grade software platforms with an emphasis on security, scalability, and long-term maintainability. The company applies architecture-led delivery and remote-first teams to build programmatic interfaces and cloud-native products.

Key Highlights

• Claims two decades of experience in the software industry.
• Lists supported API protocols: REST, JSON, XML, and SOAP.
• Identifies Amazon Web Services (AWS) as its cloud platform for architecture and infrastructure work.
• Publishes operating hours of Mon–Sat 09:00–18:00 on its API services page.

Services

• API Development
• ERP Integration & Development
• E-commerce API Integration
• Legacy System Modernization

Contact Information

Website: aitina.ie

Email: info@aitina.ie

Address: Block B, Maynooth Business Campus, Maynooth, Co Kildare, Ireland

4. Seichō (Seicho)

Seichō is a Dublin-based B2B creative agency that pairs brand strategy with web and software development. The studio combines design, development, and performance marketing to deliver growth-focused digital products and websites for B2B companies.

Seichō structures projects around commercial outcomes and continuous optimisation to help clients scale. The team brings together designers, strategists, developers, and marketers to align brand and technical delivery for measurable pipeline growth.

Key Highlights

• 104 B2B brands built and 98% client retention as stated on the site.
• Works across 12+ industries including SaaS, professional services, manufacturing, healthcare, and financial services.
• Publishes a proprietary "Growth Architecture™" framework with four pillars: Commercial Intelligence, Strategic Architecture, Precision Execution, and Performance Optimisation.
• Site cites an average lead increase of 3x for clients after engagement.

Services

• API Integrations
• Custom CRM
• Web Apps
• SaaS Platforms

Contact Information

Website: seicho.ie

Email: studio@seicho.ie

Phone: +1 617 397 7469

Address: Dublin City Centre, Ireland

Address: Dartmouth St, Boston MA

5. Cyrex Ltd.

Cyrex Ltd. is an engineering-led firm headquartered in Ireland that validates reliability and safety for multiplayer games and high-concurrency enterprise platforms.

The team tests live ecosystems and builds resilient backend components so platforms hold up under realistic user behavior and launch-day load.

Key Highlights

• Cyrex operates Cyrex Swarm™, a multi‑million concurrent‑user simulation platform that models realistic player behavior for launch-grade load testing.
• The firm uses a Pair Hacking methodology that pairs senior engineers with proprietary AI-agents to accelerate enumeration and expose deep logic exploits.
• Cyrex lists a consultancy of 30+ elite offensive engineers and cites more than 10 years of AAA-level security experience.
• The company states it is trusted by 150+ studios and enterprise clients, naming partners such as Amazon Games, Tencent, and Take-Two Interactive.

Services

• API & Cloud Infrastructure Audits
• Real-time Exploit Detection
• High-Performance APIs & Service Meshes
• Web3 Smart Contract Review

Contact Information

Website: cyrex.tech

Email: hello@cyrex.tech

Address: Landscape House, Baldonnell Business Park, Baldonnell, Dublin 22, D22P3K7

Address: Kwadestraat 155 bus 12.2, 8800 Roeselare

6. Arekibo

Arekibo is a Dublin-based enterprise digital agency that engineers APIs and integration layers to connect CMS, CRM, e-commerce, and backend systems for large organisations. The team combines platform engineering with experience design and analytics-led delivery to build and operate cloud-ready digital platforms.

Arekibo targets complex, enterprise-level implementations by pairing platform selection and build capabilities with continuous operational support to keep integrated systems performing at scale.

Key Highlights

• ISO 27001 certified, as noted in the company news and certifications section.
• A 14-year partnership with Electric Ireland is highlighted among client engagements.
• Supported platform specialisms explicitly include Sitecore, Sitefinity, WordPress, and Contentful.
• Named enterprise clients include HPRA, Mater Private, and Microsoft, shown on the clients list and case highlights.

Services

• API development
• Platform integration
• Cloud & infrastructure engineering
• Managed platform support

Contact Information

Website: arekibo.com

Phone: +353 1 905 2030

Email: enquiry@arekibo.com

Address: 16 Windsor Place, Lower Pembroke Street, Dublin 2, D02W680, Ireland

7. OWI Web Development

OWI Web Development is a Dublin-based agency that builds websites, e-commerce platforms, and bespoke web applications for Irish SMEs. They deliver projects that combine practicality with long-term maintainability to help businesses scale online.

Their delivery emphasises scalable architecture and centralised workflows, enabling third-party integrations that automate bookings, staffing and commerce while keeping sites fast and SEO-ready.

Key Highlights

• Tech stack on the site lists WordPress, WooCommerce, Shopify, Angular, React and HTML5.
• Case study: "Get the Shifts – Custom Staffing Web Application" published 12 Feb 2020.
• Portfolio includes a "Medix Clinic – Website Redesign & Booking Integration" example showing integration work.
• Registered in Ireland with company number 640720 as stated on the site.

Services

• WordPress Development
• Custom Web Applications
• E-Commerce Websites
• Mobile App Development

Contact Information

Website: owi.ie

Phone: +353 (1) 556 3030

Email: info@owi.ie

Address: 43 O'Connell Street Upper, Dublin 1, D01 DK81

8. Seditio Group

Seditio Group designs, develops and scales custom SaaS platforms, AI-powered applications and enterprise digital products, bringing product judgment together with senior architecture and delivery. The firm focuses on pragmatic cloud stacks and API-led integrations to make complex platforms dependable in production.

They engineer AI model integration, retrieval and agentic workflows inside secure operational processes and maintain long-term support through senior-led teams. Seditio delivers work from Ireland and the Philippines with visible delivery responsibilities from discovery through continuous evolution.

Key Highlights

• The company was founded in Dublin in 2014.
• Since 2023, Seditio has trained more than 300 executives in AI.
• Named clients include Dublin Airport, An Post and the Irish Times.
• Published case studies include Biologit (AI pharmacovigilance) and SectorSift (AI prospect intelligence).

Services

• SaaS platform development
• API and systems integration
• AI model integration and agentic systems
• Cloud architecture and automated delivery

Contact Information

Website: seditio.ie

Phone: +353 85 161 0136

Email: info@seditio.ie

Address: Dublin · Cebu

9. 2Cubed

2Cubed is an Irish web design and development agency that builds bespoke websites and custom integrations, including APIs, for businesses across Ireland. The team delivers full-stack front-end and back-end development with a practical emphasis on secure, scalable implementations suited to integration-heavy projects.

They pair design and engineering to take projects from planning through launch, making them a fit for organisations that need web platforms connected to third-party systems. Their delivery approach emphasises selecting the right technology for each project rather than imposing a single stack.

Key Highlights

• Established in 2011.
• Having worked with more than 500 organisations across sectors including healthcare, retail, construction, and education.
• eCommerce projects built using WooCommerce and Shopify.
• Website Maintenance service includes updates, security monitoring and ongoing development.

Services

• Web Design
• eCommerce Web Design
• UI & UX Design
• Digital Marketing & SEO

Contact Information

Website: 2cubed.ie

Phone: Wexford Office: +353 51 440 425; Dublin Office: +353 1 905 8114

Email: hello@2cubed.ie

10. Crescentek

Crescentek is an Ireland-based digital agency that develops custom web applications and headless sites using an API-first approach for Irish businesses. They focus on production-ready builds and ongoing technical support rather than one-off handovers.

The team uses a modern stack — Next.js, Node.js, Laravel, React, PHP and Python — to deliver workflow automation and managed hosting for live systems. That engineering-first toolset makes them a practical choice for API-driven development and automation projects in Ireland.

Key Highlights

• Office listed in Dublin 13, Ireland.
• Offers AI services with explicit EU AI Act Compliance support.
• Integration and automation platform support includes Stripe, HubSpot, Zapier and Make.
• Partnership delivery options state White Label Development, Dedicated Developers and Project Overflow.

Services

• Integrations & Automation
• Ecommerce Development
• AI Services & Compliance
• Performance, Security & Hosting

Contact Information

Website: crescentek.ie

Phone: +353 (0)16 852547

Email: hello@crescentek.ie

Address: Dublin 13, Ireland

11. Ayagan IT Services

Ayagan IT Services is a Dublin-based technology partner that delivers software engineering, cloud, AI and automation solutions to Irish businesses.
It fits the API integration and development topic because a compact, hands-on engineering team builds connectors, implements end-to-end integrations and deploys workflow automation for banks, insurers and fintech firms.

Key Highlights

• Trading since 2018.
• Operates as a licensed Irish Employment Agency — Licence EA 5537.
• Maintains an explicit test automation toolset that includes Selenium, Playwright and Cypress.
• Eight years placing specialist IT talent into Irish financial services.

Services

• Custom software development
• Cloud migration & management
• Data engineering & business intelligence

Contact Information

Website: ayaganitservices.com

Phone: +353 1 969 6697

Email: info@ayaganitservices.com

Address: The Black Church, St Mary's Place, Dublin 7

12. Pexlify (Enterprise Solutions)

Pexlify (Enterprise Solutions) is a Dublin-founded enterprise consultancy now operating as a Merkle company that delivers Salesforce platform implementations and system-to-system integrations. Its delivery model emphasizes API-led integration and custom Salesforce Lightning components to connect CRM, commerce, and backend systems.

That technical focus and reuse of Lightning components make Pexlify a natural fit for API integration and development projects in Ireland. The team combines configurable accelerators with implementation services to shorten time-to-value for large Salesforce programmes.

Key Highlights

• Acquired into the Merkle family and presented publicly as Pexlify, a Merkle company.
• Publishes Salesforce AppExchange Lightning components and implementation assets.
• Case work includes a delivered Salesforce Lightning Sales Cloud project branded “Smart Hub” for MDL Mercedes‑Benz.
• Operates in-market as Merkle Ireland (Pexlify) Limited and is active in the UK & Ireland Salesforce partner ecosystem.

Services

• Sales Cloud implementations
• API integration & middleware
• Lightning component development
• Integration accelerators

Contact Information

Website: pexlify.com

LinkedIn: linkedin.com/company/pexlify-enterprise-solutions

Conclusion

SoftPro is the featured partner on this list for organisations in Ireland seeking API integration and development support. It is positioned for mid-market and enterprise projects that require complex system integration.

When choosing a provider, match the vendor to your project scale, technical risk profile, and platform specificity rather than relying on reputation alone. Prioritise firms that can show relevant case studies, offer an architecture review and clear SLAs for ongoing support, and agree to a small proof-of-concept before full delivery.