Enterprise software never plays nice out of the box. You've got your CRM yelling at the ERP, the payment gateway ignoring inventory, and marketing tools living in their own universe. Custom API integration companies exist to stitch all that chaos together so data flows where it needs to go - without constant babysitting. These aren't the plug-and-play Shopify apps; they're the heavy lifters that build secure, scalable bridges between million-dollar systems. Here's who actually delivers when the stakes are high.

 

1. OSKI Solutions

OSKI Solutions concentrates on custom enterprise API integrations that link separate systems inside large organizations. Our work centers on creating connections that let data move smoothly between different applications, which helps reduce manual steps and keeps workflows running without constant fixes. We use tools like RESTful APIs, GraphQL, and middleware to build setups that match what each company already has in place.

Our team also extends these integrations into related areas when needed. Companies often need cloud setups, modern frontends, or AI features tied into the same data flow, and we handle those pieces as part of larger projects. We work with businesses in fields like e-commerce, logistics, education, and retail to make the whole software stack operate as one unit.

Key Highlights:

• Use RESTful APIs, GraphQL, and middleware for integrations
• Build connections between existing enterprise systems
• Automate processes through system integration
• Work across cloud, frontend, and AI projects
• Serve sectors including e-commerce, logistics, education, and energy

Services:

• Custom enterprise API integration
• Cloud development and migration (AWS, Azure, serverless, hybrid setups)
• Frontend development (React, Vue, Angular, React Native, Next)
• AI and machine learning integrations
• Full-cycle software design, development, deployment, and support

Contacts:

• Website: oski.site
• E-mail: contact@oski.site
• LinkedIn: www.linkedin.com/company/oski-solutions
• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia
• Phone Number: +48571282759

 

2. Apriorit

Apriorit provides API development and integration services with a strong focus on security. They create new APIs from scratch or connect existing third-party APIs to enterprise systems. The team handles everything from planning and building to testing and ongoing support, often working with complex or legacy setups that lack documentation.

Security stays central in their process - they apply authentication, traffic control, encryption, and detailed testing to protect data flows. Apriorit works across different industries and adjusts the technical stack to match each project while keeping performance and scalability in mind.

Key Highlights:

• Great experience in software and cybersecurity
• Security-first approach in all API projects
• Handles legacy and undocumented API integration
• Supports reverse engineering when needed
• Works with desktop, mobile, web, and cloud solutions

Services:

• Custom API design and development
• Third-party API integration
• Legacy API integration and modernization
• API testing (performance, load, security)
• API audit, maintenance, optimization, and troubleshooting

Contacts:

• Website: www.apriorit.com
• E-mail: info@apriorit.com
• Facebook: www.facebook.com/apriorit
• Twitter: x.com/apriorit
• LinkedIn: www.linkedin.com/company/apriorit
• Address: 20 Central Ave, Unit 505, Lynn, MA 01901, USA
• Phone: +1 714 584 0295

 

3. PNN Soft

PNN Soft delivers API development and integration services using protocols like REST, SOAP, XML, and RPC. They build both internal and external APIs that respond quickly and come with clear documentation. The company creates solutions for mobile, cloud, and web environments and adapts them to specific business requirements.

Their teams include developers, analysts, QA engineers, and designers who follow Agile, DevOps, and other modern methodologies. PNN Soft has worked on projects ranging from CRM systems to IoT applications and embedded software over more than two decades.

Key Highlights:

• Uses REST, SOAP, XML, RPC protocols
• Provides full-cycle API implementation and support
• Follows Scrum, DevOps, CI/CD, and TDD practices
• Experience across telecom, energy, IoT, and mobile gaming

Services:

• Custom API development for mobile, cloud, and web
• Third-party API integration and customization
• API testing, support, and maintenance
• Service-oriented architecture implementation
• Dedicated development teams

Contacts:

• Website: pnnsoft.com
• E-mail: info@pnnsoft.com
• LinkedIn: www.linkedin.com/company/pnn-soft
• Twitter: x.com/pnn_soft
• Facebook: www.facebook.com/pnnsoft
• Address: 182-184 High Street North, East Ham, London, UK
• Phone: +380 94 855 30 35

 

4. Luvina

Luvina focuses on custom API development and integration tailored to individual business needs. They design and build APIs from the ground up or connect existing third-party services to create smooth data exchange between applications. The process covers requirements gathering, design, coding, testing, and deployment.

The company works with different API types - public, private, partner, and composite - and supports mobile, desktop, and cloud environments. Luvina places emphasis on security measures, performance optimization, and detailed documentation throughout each project.

Key Highlights:

• Operating with a focus on quality delivery
• Builds REST APIs and handles various API types
• Offers automated unit, functional, and load testing
• Multilingual teams for international projects
• Strong attention to intellectual property protection

Services:

• Custom API development from scratch
• Third-party and legacy API integration
• Automated API testing
• Internal and external API documentation
• Full-cycle implementation for web, mobile, and cloud

Contacts:

• Website: luvina.net
• E-mail: info@luvina.net
• LinkedIn: www.linkedin.com/company/luvina-software-outsourcing
• Twitter: x.com/LuvinaGlobal
• Facebook: www.facebook.com/LuvinaSoftware
• Address: 138N Almaden Blvd, Unit 125, San Jose, California 95110-2720, United States
• Phone: +1 (408) 805-2148

 

5. MuleSoft

MuleSoft offers Anypoint Platform, a complete environment for building, managing, and scaling APIs and integrations. The platform combines tools for design, development, deployment, and monitoring in one place and supports both code-based and low-code approaches.

Teams use pre-built connectors for common systems or create custom ones when needed. MuleSoft handles connectivity across on-premises, cloud, and hybrid setups while applying consistent security policies and governance rules.

Key Highlights:

• Unified platform for APIs, integrations, and automation
• Large library of maintained connectors
• Built-in API governance and security controls
• Supports deployment on cloud, on-premises, or hybrid
• Includes monitoring and runtime management tools

Services:

• API design, documentation, and management
• Integration development with pre-built and custom connectors
• API governance and security enforcement
• Deployment and monitoring across environments
• B2B integration and message queuing

Contacts:

• Website: www.mulesoft.com
• Instagram: www.instagram.com/mulesoft
• LinkedIn: www.linkedin.com/company/mulesoft
• Twitter: x.com/MuleSoft
• Facebook: www.facebook.com/MuleSoft
• Address: Salesforce, Inc. Salesforce Tower, 415 Mission Street, 3rd Floor, San Francisco, CA 94105, United States
• Phone: 1-800-596-4880

 

6. Celigo

Celigo provides an Integration Platform as a Service (iPaaS) that simplifies API connections between business applications. The platform offers pre-built connectors and automation tools so teams can link systems without writing large amounts of custom code.

Users set up data synchronization, workflow automation, and real-time updates through a visual interface. Celigo handles ongoing maintenance of connectors and scales connections as companies add new applications or grow existing ones.

Key Highlights:

• Cloud-based iPaaS focused on automation
• Pre-built connectors for popular business applications
• Low-code interface for non-developers
• Real-time data synchronization capabilities
• Centralized management of all integrations

Services:

• API integration through pre-built connectors
• Automated data synchronization between applications
• Workflow automation setup
• Integration monitoring and error handling
• Scalable connections for growing businesses

Contacts:

• Website: www.celigo.com
• E-mail: info@celigo.com
• LinkedIn: www.linkedin.com/company/celigo-inc
• Twitter: x.com/celigoinc
• Address: 3 Lagoon Dr. Suite 130, Redwood City, CA 94065
• Phone: (650) 579-0210

 

7. Accenture

Accenture takes on enterprise API integrations by linking up major systems that often don't talk to each other easily - things like ERPs from SAP or Oracle, Salesforce CRMs, Workday HR platforms, and various cloud apps or old databases. They frequently team up with tools from MuleSoft or SAP to create connections that companies can reuse across projects. The process starts with figuring out a solid strategy, moves into building custom pieces using languages like Java, Python, or Node.js, and keeps going with support afterward.

Security gets built in from the start, with encryption, access rules, and checks for regulations like GDPR or HIPAA. Teams at Accenture handle the full cycle so organizations end up with setups that adapt as needs change. Whether it's adding new SaaS tools or tying legacy parts into modern flows, the integrations aim to keep data moving reliably across the whole IT landscape.

Key Highlights:

• Works with partners like MuleSoft and SAP
• Connects ERPs, CRMs, HR systems, and legacy databases
• Builds reusable APIs for faster rollout
• Applies encryption and compliance controls
• Provides strategy, implementation, and maintenance

Services:

• API strategy planning and consulting
• Custom development with REST, GraphQL, WebSocket
• Integration for cloud, SaaS, and on-premises systems
• Full lifecycle support including security
• Application modernization tied to integrations

Contacts:

• Website: www.accenture.com
• Address: Hallesches Ufer 40, Berlin, Germany, 10963
• Phone: +49308904761900

 

8. Merge.dev

Merge.dev runs a single API layer that connects to many different third-party services at once, covering areas like HR systems, applicant tracking, CRMs, and accounting tools. Developers write code against one consistent model instead of handling each provider's quirks separately. This setup makes it straightforward to sync standard data and also manage custom fields or objects that companies add to their instances.

The platform deals with updates and fixes behind the scenes whenever the underlying services change. For internal tools or customer-facing products, it cuts down the work needed to keep connections running. Authentication, rate limits, and pagination all follow one pattern, so adding new integrations doesn't require starting over each time.

Key Highlights:

• Unified interface for multiple service categories
• Supports custom fields and object mapping
• Handles HRIS, ATS, CRM, and accounting connections
• Manages maintenance for underlying APIs
• Simplifies real-time data synchronization

Services:

• Unified API for third-party integrations
• Custom field synchronization
• Data model normalization across providers
• Error handling and logging
• Scalable connections for customer products

Contacts:

• Website: www.merge.dev
• LinkedIn: www.linkedin.com/company/merge-api
• Twitter: x.com/merge_api

 

9. Infomaze

Infomaze puts together API connections that tie applications to payment systems, accounting software, cloud platforms, and social tools. They use common protocols like REST and SOAP along with secure login methods such as OAuth or JWT tokens. Projects often involve real-time data updates between websites, mobile apps, and backend services to cut out repeated manual entries.

The team tests connections thoroughly before going live and handles automation for tasks like syncing orders or customer details. Whether linking QuickBooks to a custom site or adding Stripe payments, the integrations fit into existing workflows across fields like healthcare, real estate, or manufacturing.

Key Highlights:

• Uses REST, SOAP, JSON, and various authentication
• Connects payment gateways and accounting tools
• Supports cloud and third-party services
• Includes automated testing
• Covers industries like education and travel

Services:

• Custom and third-party API development
• Payment and accounting system links
• Cloud-based application connections
• Social media and mapping integrations
• Full testing and deployment support

Contacts:

• Website: www.infomazeelite.com
• E-mail: sales@infomazetech.com
• Instagram: www.instagram.com/InfomazeElite
• LinkedIn: www.linkedin.com/company/infomazeelite
• Twitter: x.com/Infomazeelite
• Facebook: www.facebook.com/infomaze
• Address: Infomaze Elite Pvt. Ltd. #286-A, Hebbal Industrial Area, Mysore - 570018 Karnataka (INDIA)
• Phone: +91 821 234 0437

 

10. Sunrise Integration

Sunrise Integration focuses on API work that keeps ecommerce operations tied together - syncing inventory, orders, shipping rates, and payments across platforms like Shopify, BigCommerce, or Magento. They build connections using REST, GraphQL, EDI, or older formats to link stores with ERPs, CRMs, warehouses, and carriers such as UPS or FedEx.

Custom pieces often include real-time updates or AI features when a business needs them. The team also reviews existing setups or plans new ones to make sure everything fits without gaps. Once live, they keep an eye on performance and handle fixes so data keeps flowing as the operation grows.

Key Highlights:

• Strong focus on ecommerce platforms
• Handles REST, GraphQL, SOAP, EDI
• Links ERP, CRM, POS, and logistics
• Incorporates AI and machine learning
• Provides consulting and reviews

Services:

• Custom API connections for retail systems
• Ecommerce order and inventory sync
• Payment processor and carrier integrations
• API planning and evaluation
• Maintenance and troubleshooting

Contacts:

• Website: www.sunriseintegration.com
• E-mail: hello@sunriseintegration.com
• Instagram: www.instagram.com/sunriseintegration
• LinkedIn: www.linkedin.com/company/sunrise-integration
• Twitter: x.com/sun_integration
• Facebook: www.facebook.com/sunriseintegration
• Phone: 800 841 3130

 

11. EPAM

EPAM helps companies sort out API strategies that turn scattered systems into something more connected and responsive. They plan out what APIs should exist, set guidelines for quality, and then build them using current standards that prioritize speed and reuse. Legacy parts get linked to newer cloud or partner data without forcing everything to change at once.

Automation plays a big role in managing and using these APIs day to day. Security checks spot weak points early, and the overall approach pushes teams toward thinking API-first. The result is setups that handle complex environments while letting developers move faster on new features.

Key Highlights:

• Develops comprehensive API strategies
• Creates scalable and reusable connections
• Links legacy with modern systems
• Runs security assessments
• Builds automation into API management

Services:

• API strategy and program design
• Custom API building and delivery
• Integration across hybrid landscapes
• Security vulnerability reviews
• Developer training and mindset shifts

Contacts:

• Website: www.epam.com 
• Instagram: www.instagram.com/epamsystems
• LinkedIn: www.linkedin.com/company/epam-systems
• Facebook: www.facebook.com/EPAM.Global
• Address: 41 University Drive, Suite 202, Newtown, PA 18940, USA
• Phone: +1-267-759-9000

 

12. Boomi

Boomi offers a platform where teams connect applications and data sources through ready-made connectors and visual tools. Machine learning suggests how to map fields between systems based on patterns from millions of past integrations. Connections work across cloud, on-premises, or mixed setups without needing separate versions.

Integrations can turn into managed APIs for reuse, or extend to trading partner EDI exchanges. The system handles updates automatically and includes monitoring to catch issues early. Data sync stays consistent even if networks drop temporarily.

Key Highlights:

• Extensive pre-built connector library
• AI-guided field mapping
• Supports hybrid and edge deployments
• Includes API and EDI management
• Automatic updates and monitoring

Services:

• Application and data source connections
• Integration to API exposure
• B2B and EDI partner links
• Workflow automation
• Centralized data governance

Contacts:

• Website: boomi.com
• E-mail: hr@boomi.com
• Instagram: www.instagram.com/_boomiofficial
• LinkedIn: www.linkedin.com/company/boomi-inc
• Facebook: www.facebook.com/Boomi.Official
• Address: 1 W Elm St, Conshohocken, PA 19428, USA

 

13. Intersog

Intersog handles system integrations by pulling together data from different sources like client networks, data centers, and SaaS tools into one central spot. They connect ERPs, CRMs, internal systems, and custom applications to keep operations running without constant switches between tools. The focus stays on making workflows smoother and spotting issues faster through better data access.

Teams at Intersog also modernize older setups by shifting monolithic applications to more flexible web-based structures while keeping existing data intact. Whether linking enterprise parts or building connections across devices, the integrations cut duplicates and add layers of protection. They work with businesses globally, often staffing projects quickly with developers that fit specific needs.

Key Highlights:

• Connects ERPs, CRMs, and proprietary applications
• Handles data from multiple sources into central repositories
• Modernizes legacy monolithic systems
• Supports enterprise, systems, and data integration
• Provides consulting and dedicated teams

Services:

• Data integration and ETL processes
• Enterprise application connections
• Systems integration across devices
• Integration consulting and architecture
• Legacy system modernization

Contacts:

• Website: intersog.com
• LinkedIn: www.linkedin.com/company/intersog
• Twitter: x.com/Intersog
• Facebook: www.facebook.com/intersognorthamerica
• Address: 220 N Green St, 2nd floor Chicago, IL 60607, USA
• Phone: +1 833 468 3776

 

14. Planeks

Planeks creates custom APIs from scratch when off-the-shelf options fall short, starting with detailed requirements to match business setups. They handle the full build - design, implementation, and tying it into existing applications or platforms. Monitoring keeps things stable after launch.

Their team also connects third-party services like payment gateways, marketing tools, marketplaces, SMS providers, social networks, maps, and healthcare systems. Connections cover areas such as e-commerce inventory, esports data, or patient management. They evaluate APIs first to check fit, performance, and security before any work begins.

Key Highlights:

• Builds scalable custom APIs
• Integrates payment, marketing, and marketplace services
• Works with social, maps, and healthcare APIs
• Covers esports and e-commerce platforms
• Includes evaluation and ongoing support

Services:

• Custom API design and development
• Third-party API connections
• API evaluation for performance and security
• Integration for web and mobile applications
• Maintenance and monitoring

Contacts:

• Website: www.planeks.net
• E-mail: info@planeks.net
• LinkedIn: www.linkedin.com/company/20496574
• Address: 124 City Road, London EC1V 2NX, United Kingdom
• Phone: 917-963-8373

 

15. Jitterbit

Jitterbit runs a platform that turns integration flows into custom APIs through a low-code setup in Cloud Studio. Users design data movements between systems first, then expose those operations as APIs via the Manager tool. An AI assistant helps speed up building and publishing.

The system handles connections across SaaS, on-premises, cloud, and legacy environments with pre-built or custom connectors. Once live, APIs get security policies, role assignments, and real-time monitoring. Deployment works in cloud or hybrid setups without separate management for each.

Key Highlights:

• Low-code platform for integrations and APIs
• Turns operations into custom or proxy APIs
• Supports cloud, on-premises, and hybrid
• Includes AI assistant for setup
• Provides management, security, and analytics

Services:

• Custom API creation from integration flows
• API configuration and publishing
• Security profiles and role assignment
• Testing and monitoring
• Deployment across environments

Contacts:

• Website: www.jitterbit.com
• Instagram: www.instagram.com/jitterbitintegration
• LinkedIn: www.linkedin.com/company/jitterbit
• Twitter: x.com/jitterbit
• Facebook: www.facebook.com/jitterbit
• Address: 1101 Marina Village Parkway, Suite 201, Alameda, CA 94501
• Phone: 1-877-852-3500

 

16. DevCom

DevCom develops APIs that link applications, databases, and devices without disrupting current workflows. They study existing systems first to create fits that scale as needs grow. Code stays clean and documented for easier handoff to internal teams.

Work covers web, cloud, intranet, or serverless setups using tools like .NET, Java, and NodeJS. Specialties include healthcare data exchange, payment processing, e-commerce sync, IoT connections, and AI features. They also integrate third-party services and optimize older systems for better performance.

Key Highlights:

• Builds APIs for web, cloud, and serverless
• Handles healthcare, fintech, and e-commerce
• Supports IoT and AI integrations
• Connects legacy with modern systems
• Focuses on scalable and secure code

Services:

• Custom API development
• Third-party and multi-platform integration
• Legacy system connections
• Performance optimization and testing
• Documentation and training

Contacts:

• Website: devcom.com
• E-mail: welcome@devcom.com
• Twitter: x.com/DevComCompany
• LinkedIn: www.linkedin.com/company/devcom
• Facebook: www.facebook.com/DevComCompany
• Address: PO 290333, Port Orange, FL 32129, United States
• Phone: +1 (800) 780 8560

 

17. Chetu

Chetu builds custom APIs using protocols like REST, SOAP, XML, and RPC to connect different business systems. They create interfaces that tie into off-the-shelf software or public third-party services. Implementations cover server communication, data sharing, and microservices.

The team adds AI capabilities through machine learning, computer vision, speech recognition, and predictive tools. Integrations often include payment gateways, shipping carriers, SMS platforms, and social networks. Testing runs automated checks for functionality and load before deployment.

Key Highlights:

• Supports REST, SOAP, XML, RPC protocols
• Builds AI-powered features like chatbots
• Integrates payment and shipping services
• Handles cloud and microservices setups
• Includes automated testing

Services:

• Custom API development and implementation
• Third-party integrations (payments, communications)
• AI and machine learning additions
• API maintenance and security
• Cloud and service-oriented architecture

Contacts:

• Website: www.chetu.com
• E-mail: sales@chetu.com
• Twitter: x.com/ChetuInc
• LinkedIn: www.linkedin.com/company/chetu-inc-
• Facebook: www.facebook.com/ChetuInc
• Address: Headquarters & Delivery Center 1500 Concord Terrace Suite 100, Sunrise FL 33323
• Phone: 954 342 5676

 

18. Clickysoft

Clickysoft connects enterprise systems through custom APIs that automate workflows and link data sources. They plan integrations around current setups, then design and build connections that fit specific processes. Deployment includes cloud or on-premise options with ongoing management.

Common links involve payment gateways, e-commerce tools, social media, and CRM systems. The process follows stages from discovery and design to development and launch. Teams test thoroughly and provide support to keep connections running smoothly.

Key Highlights:

• Focuses on enterprise system connections
• Handles payment and e-commerce integrations
• Includes social media and CRM links
• Uses agile development stages
• Provides management and monitoring

Services:

• API integration strategy and planning
• Custom API development
• Third-party and cloud integrations
• Automated testing
• Deployment and managed services

Contacts:

• Website: www.clickysoft.com
• E-mail: info@clickysoft.com
• Instagram: www.instagram.com/clickysoft
• Twitter: x.com/clickysoft99
• LinkedIn: www.linkedin.com/company/clicky-soft
• Facebook: www.facebook.com/ClickySoft
• Address: 1423 Ashen Flock CT Katy TX, 77494
• Phone: +1 (832) 847-6000

 

19. EvinceDev

EvinceDev builds custom APIs that let business applications share data and connect with internal or external systems. They handle everything from consulting on the right approach to creating new APIs or linking existing ones. Connections often pull in features like payments, social insights, or real-time updates to keep processes running without separate silos.

The team works with various technologies to fit different setups - whether it's PHP for performance tweaks, Node.js for handling heavy data loads, or GraphQL for flexible queries. Projects range from mobile and web APIs to cloud or private ones. Testing runs automated checks, and they support integrations for SaaS tools, e-commerce, chat systems, or security features.

Key Highlights:

• Covers custom, third-party, and cloud APIs
• Uses PHP, .NET, Node.js, Java, Ruby frameworks
• Handles mobile, web, and private API setups
• Includes automated testing
• Works across retail, healthcare, education sectors

Services:

• API consulting and strategy
• Custom API development
• Third-party API integration
• API testing automation
• Mobile, web, and cloud API building

Contacts:

• Website: evincedev.com
• E-mail: info@evdpl.com
• Instagram: www.instagram.com/evincedevelopment
• Twitter: x.com/evincedev
• LinkedIn: www.linkedin.com/company/evince-development
• Facebook: www.facebook.com/EvinceDev
• Address: 387 Park Avenue South,5th Floor, New York City, New York, 10016 USA
• Phone: (315) 715-8494

 

20. Belitsoft

Belitsoft creates custom APIs to link systems and share data in real time, often automating workflows across applications. They build REST or GraphQL interfaces and connect internal tools with external services. Work includes making APIs public for wider use or adding machine learning layers when needed.

Teams handle mobile APIs for features like payments or location, web APIs for remote data access, and cloud setups with platforms like AWS or Azure. Integrations cover SaaS, IoT devices, e-commerce sync, CRM links, ERP data flow, logistics tracking, and payment processing. Security stays a focus, especially in healthcare or finance with compliant connections.

Key Highlights:

• Builds REST, GraphQL, and webhook APIs
• Connects SaaS, IoT, CRM, ERP systems
• Handles mobile, web, and cloud environments
• Supports healthcare and finance compliance
• Includes LLM and AI model integrations

Services:

• Custom API development and consulting
• Third-party and legacy system integration
• Mobile and web API creation
• Cloud API setups (AWS, Azure)
• API testing and gateway management

Contacts:

• Website: belitsoft.com
• E-mail: info@belitsoft.com
• Twitter: x.com/BelitsoftCom
• Facebook: www.facebook.com/Belitsoft
• LinkedIn: www.linkedin.com/company/belitsoft-llc
• Phone: +1 (917) 410-57-57

Final Thoughts

Picking the right partner for enterprise API integrations boils down to matching what they actually do with the mess you're dealing with day to day. Some outfits lean hard into building everything from the ground up when off-the-shelf options just won't cut it, while others make quick work of stitching together existing services so data finally flows where it's supposed to.

At the end of the day, the good ones focus on connections that don't break when things scale or when some third-party updates their side without warning. It's less about flashy tools and more about setups that quietly keep different parts of the business talking without someone constantly stepping in to fix things. If the integrations handle real workloads securely and adapt as needs shift, that's usually a solid sign you've found a decent fit.