Mulesoft Integration Developer

Free-Work UK; Belfast City District; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Private healthcare

Share scheme

Pension plan

Job summary

CGI in Belfast is seeking a skilled MuleSoft Developer to design, develop and support enterprise-grade integrations between Salesforce and critical business systems. You’ll work with architects, engineers and business stakeholders to translate designs into scalable services, ensuring security, performance and reliability.

In this hybrid role, you’ll own delivery of MuleSoft APIs, data transformations and integration flows, contribute to testing and documentation, and apply best practices across

Qualifications

• Proven commercial experience developing with MuleSoft 4 and DataWeave.
• Strong experience with MuleSoft Anypoint Platform (Studio, API Manager, Exchange).
• Experience deploying MuleSoft apps to CloudHub 2.0 or equivalent runtime.

Responsibilities

• Develop and deliver MuleSoft APIs, connectors and integration flows.
• Build DataWeave transformations for XML and JSON data.
• Collaborate with architects, Salesforce developers, business analysts and partners.
• Troubleshoot, test and enhance integrations for performance and reliability.
• Apply security best practices including OAuth 2.0, JWT, TLS and API gateways.
• Design robust error handling, retries and message correlation.
• Develop automated tests using MUnit and support regression testing.
• Produce technical documentation and conduct code reviews.
• Support build, deployment and defect resolution across environments.
• Contribute to continuous improvement with MuleSoft and Salesforce best practices.

Skills

MuleSoft 4

DataWeave

REST/JSON

OAuth 2.0 / Security

CI/CD

Git

Tools

Anypoint Studio

API Manager

Anypoint Exchange

CloudHub 2.0

Git

Maven

CI/CD pipelines

Job description

We are looking for a skilled MuleSoft Developer to join CGI, where you'll play a pivotal role in delivering secure, scalable integration solutions that help our clients transform how their organisations connect, operate and innovate.

Working at the heart of enterprise technology, you'll develop high-quality integrations between Salesforce and critical business systems, enabling reliable data exchange and measurable business outcomes. You'll have the opportunity to take ownership of complex technical challenges, collaborate with experienced specialists, and contribute to solutions that make a real impact, all within a supportive environment that encourages continuous learning, innovation and career growth.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK 'Best Employer' by the Financial Times.

We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee.

We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant.

Join us and you'll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance.

This is a hybrid position, requiring 2-3 days per week onsite in Belfast.

Candidate Profile

In this role, you will design, develop and support enterprise-grade MuleSoft integrations that enable secure, reliable communication between Salesforce and a range of business-critical platforms. Working alongside architects, engineers, business stakeholders and external partners, you'll translate solution designs into scalable integration services that align with enterprise architecture standards while ensuring high performance, resilience and security.

You’ll take ownership of integration delivery throughout the development lifecycle, contributing to technical discussions, improving development standards and helping deliver innovative solutions that create lasting value for our clients. Supported by an experienced team, you'll continuously develop your expertise while playing a key role in delivering high-quality integration capabilities.

Key responsibilities

• Develop and deliver secure MuleSoft APIs, connectors and integration flows.
• Build DataWeave transformations for XML and JSON data.
• Collaborate with architects, Salesforce developers, business analysts and integration partners to deliver effective solutions.
• Troubleshoot, test and enhance integrations to maximise performance, resilience and reliability.
• Implement security best practices including OAuth 2.0, JWT, TLS, API gateways and WS-Security.
• Design robust error handling, retries, message correlation and reliable processing patterns.
• Develop and maintain automated unit tests using MUnit and support system, integration and regression testing.
• Conduct code reviews and produce technical documentation.
• Support controlled build, deployment and defect resolution across development, test and pre-production environments.
• Contribute to continuous improvement by applying MuleSoft and Salesforce best practices aligned with enterprise architecture standards.

Required Qualifications To Be Successful In This Role

To succeed in this role, you'll bring proven experience delivering enterprise integrations using MuleSoft together with strong API development expertise and an understanding of Salesforce integration patterns. You'll be comfortable working collaboratively within multidisciplinary teams and delivering secure, scalable solutions in line with architectural standards.

Essential Qualifications

• Proven commercial experience developing with MuleSoft 4 and DataWeave.
• Strong experience with MuleSoft Anypoint Platform, including Anypoint Studio, API Manager and Anypoint Exchange.
• Experience deploying MuleSoft applications to CloudHub 2.0 or equivalent runtime environments.
• Strong knowledge of REST/JSON, SOAP/XML, XSD, WSDL and data transformation techniques.
• Experience implementing Salesforce integration patterns and API contracts.
• Experience with synchronous and asynchronous integration patterns, including retries, idempotency, message correlation and error handling.
• Experience developing automated tests using MUnit.
• Strong understanding of integration security including OAuth 2.0, JWT, TLS, API gateways and WS-Security.
• Experience using Git, Maven and CI/CD pipelines.
• Ability to interpret solution designs, API specifications, schemas and data mappings.
• Excellent analytical, problem-solving and stakeholder communication skills.

Desirable

• MuleSoft Developer Certification.
• Salesforce certification or Salesforce integration experience.
• Experience with enterprise integration architecture and messaging patterns.
• Experience modernising legacy SOAP/XML integrations.
• Working knowledge of Java.
• Experience integrating MuleSoft with AWS-hosted services or data platforms.