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69 API jobs in County Antrim + 5 miles
Location: Hybrid (2/3 days per week in office) Recruitment Partner: VANRATH - Job Type: Full-time | Permanent - Industry: Financial Technology / Payments - VANRATH is proud to be recruiting on behalf of a global leader in digital payments-an organization known for delivering secure, innovative financial solutions that support billions of transactions worldwide each year. This is a rare opportunity to join a purpose-driven company where technology meets impact. You'll work alongside top-tier engineers to build infrastructure that empowers people, businesses, and economies across more than 200 countries and territories. As a Staff Software Engineer within the Payment Processing team, you'll be a technical leader focused on building and enhancing complex payment integration systems. You'll help design highly available, scalable services while mentoring your peers and dri
Location: Hybrid (2/3 days per week in office) Recruitment Partner: VANRATH - Job Type: Full-time | Permanent - Industry: Financial Technology / Payments - VANRATH is proud to be recruiting on behalf of a global leader in digital payments-an organization known for delivering secure, innovative financial solutions that support billions of transactions worldwide each year. This is a rare opportunity to join a purpose-driven company where technology meets impact. You'll work alongside top-tier engineers to build infrastructure that empowers people, businesses, and economies across more than 200 countries and territories. As a Staff Software Engineer within the Payment Processing team, you'll be a technical leader focused on building and enhancing complex payment integration systems. You'll help design highly available, scalable services while mentoring your peers and dri
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Job Title: Staff Software Engineer (Python + Frontend) Type: Full-time - About the Role - We are seeking a highly experienced Staff Software Engineer with deep expertise in Python and a modern frontend framework (such as React, Vue, or Angular). In this role, you'll play a key part in designing and delivering scalable, high-performance systems that drive our core platform. Youll collaborate across teams to define technical strategy, build robust architecture, and mentor other engineers. This is a hands-on role for someone who thrives in a fast-paced, problem-solving environment and wants to have a significant impact on both the product and engineering culture. What Youll Do * Lead the design and development of scalable backend services using Python. * Architect and implement frontend features using your preferred modern JavaScript framework (e.g., React, Vue, Angular)
Job Title: Staff Software Engineer (Python + Frontend) Type: Full-time - About the Role - We are seeking a highly experienced Staff Software Engineer with deep expertise in Python and a modern frontend framework (such as React, Vue, or Angular). In this role, you'll play a key part in designing and delivering scalable, high-performance systems that drive our core platform. Youll collaborate across teams to define technical strategy, build robust architecture, and mentor other engineers. This is a hands-on role for someone who thrives in a fast-paced, problem-solving environment and wants to have a significant impact on both the product and engineering culture. What Youll Do * Lead the design and development of scalable backend services using Python. * Architect and implement frontend features using your preferred modern JavaScript framework (e.g., React, Vue, Angular)
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Senior Software Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on high-volume, real-time transactional services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning
Senior Software Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on high-volume, real-time transactional services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning
Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
The Opportunity - Ocho is partnering with a fast-growing, product-led client to find a Performance Engineer to establish and scale a dedicated performance testing function. This is a hands-on role with scope to define strategy, shape tooling, and work across engineering, DevOps, and TechOps to ensure scalability and quality at every level of the application stack. Key Responsibilities * Own and deliver a company-wide performance testing strategy, including load, stress, and soak testing * Design and implement replica performance environments across cloud and on-prem infrastructure * Guide performance tooling, test data, and traffic modelling using tools like JMeter & K6 * Work closely with engineering teams to embed shift-left performance practices early in the SDLC - Essential Experience * 5+ years in performance testing
The Opportunity - Ocho is partnering with a fast-growing, product-led client to find a Performance Engineer to establish and scale a dedicated performance testing function. This is a hands-on role with scope to define strategy, shape tooling, and work across engineering, DevOps, and TechOps to ensure scalability and quality at every level of the application stack. Key Responsibilities * Own and deliver a company-wide performance testing strategy, including load, stress, and soak testing * Design and implement replica performance environments across cloud and on-prem infrastructure * Guide performance tooling, test data, and traffic modelling using tools like JMeter & K6 * Work closely with engineering teams to embed shift-left performance practices early in the SDLC - Essential Experience * 5+ years in performance testing
Working exclusively on frontend engineering (no backend work) while defining API schemas.
Working exclusively on frontend engineering (no backend work) while defining API schemas.
This is a hands-on, collaborative role focused on API-level test automation, BDD/TDD practices, and CI/CD pipeline integration. * Background in API testing and automation with tools like Selenium, Cypress, or Playwright
This is a hands-on, collaborative role focused on API-level test automation, BDD/TDD practices, and CI/CD pipeline integration. * Background in API testing and automation with tools like Selenium, Cypress, or Playwright
Automation Playwright Specflow API Postman
Automation Playwright Specflow API Postman
Defining API schemas and working closely with backend teams * Experience in API design and frontend performance optimisation
Defining API schemas and working closely with backend teams * Experience in API design and frontend performance optimisation
Skilled in API design, RESTful services, and structured data workflows
Skilled in API design, RESTful services, and structured data workflows
MCS Group is seeking a skilled and motivated Cloud Azure Data Engineer to join a high-performing data engineering team delivering enterprise-grade solutions. This is an exciting opportunity to work on a modern Lakehouse architecture that powers analytics, AI, and business-critical applications across the organisation. You'll be responsible for building and maintaining scalable data pipelines using Azure Synapse and other cloud-native tools, curating high-quality datasets, and enabling backend data services that support a single source of truth for the enterprise. This is a hands-on role for an engineer with a passion for automation, data governance, and cloud-first innovation. * Design and implement scalable pipelines in Azure Synapse, using the medallion architecture * Develop and optimise ETL/ELT workflows using Python, SQL, and PySpark
MCS Group is seeking a skilled and motivated Cloud Azure Data Engineer to join a high-performing data engineering team delivering enterprise-grade solutions. This is an exciting opportunity to work on a modern Lakehouse architecture that powers analytics, AI, and business-critical applications across the organisation. You'll be responsible for building and maintaining scalable data pipelines using Azure Synapse and other cloud-native tools, curating high-quality datasets, and enabling backend data services that support a single source of truth for the enterprise. This is a hands-on role for an engineer with a passion for automation, data governance, and cloud-first innovation. * Design and implement scalable pipelines in Azure Synapse, using the medallion architecture * Develop and optimise ETL/ELT workflows using Python, SQL, and PySpark
Senior Java Engineer - Contract - Location: Belfast (Hybrid) Contract Type: Daily Rate (6-Month Initial Term) Are you a skilled Java developer looking for your next contract opportunity? Our client, a well-established local organisation, is currently seeking a Senior Java Engineer to join their dynamic team for an initial 6-month contract. This is an excellent opportunity to work on impactful projects within a collaborative and supportive environment. As a Senior Java Engineer, you'll play a key role in the design, development, and delivery of high-quality software solutions. Working closely with cross-functional teams, you will be involved in the full software development lifecycle - from requirements gathering and system design to implementation, testing, and deployment. This role offers a hybrid working model, allowing you the flexibility to work both remotely and
Senior Java Engineer - Contract - Location: Belfast (Hybrid) Contract Type: Daily Rate (6-Month Initial Term) Are you a skilled Java developer looking for your next contract opportunity? Our client, a well-established local organisation, is currently seeking a Senior Java Engineer to join their dynamic team for an initial 6-month contract. This is an excellent opportunity to work on impactful projects within a collaborative and supportive environment. As a Senior Java Engineer, you'll play a key role in the design, development, and delivery of high-quality software solutions. Working closely with cross-functional teams, you will be involved in the full software development lifecycle - from requirements gathering and system design to implementation, testing, and deployment. This role offers a hybrid working model, allowing you the flexibility to work both remotely and
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Principal Performance Test Engineer - Remote
Principal Performance Test Engineer - Remote
VANRATH
Belfast, County Antrim
£60,000 - £70,000 per annum
Principal Performance Tester - Shape & Lead Performance Engineering - We're recruiting for a Principal Performance Tester to help establish and grow a performance testing capability at a fast-scaling tech business in the payments space. You'll drive strategy, design environments, and ensure systems meet demanding performance and scalability needs. * Define and deliver performance testing strategy (load, stress, soak). * Design, build, and optimise performance test environments. * Lead performance testing across APIs, web apps, and databases. * Provide insight on risks, bottlenecks, and tuning opportunities. * Guide and mentor teams, driving best practices and a shift-left approach. * 8-10+ years' experience in performance testing enterprise systems. * Significant leadership in quality/performance engineering.
Principal Performance Tester - Shape & Lead Performance Engineering - We're recruiting for a Principal Performance Tester to help establish and grow a performance testing capability at a fast-scaling tech business in the payments space. You'll drive strategy, design environments, and ensure systems meet demanding performance and scalability needs. * Define and deliver performance testing strategy (load, stress, soak). * Design, build, and optimise performance test environments. * Lead performance testing across APIs, web apps, and databases. * Provide insight on risks, bottlenecks, and tuning opportunities. * Guide and mentor teams, driving best practices and a shift-left approach. * 8-10+ years' experience in performance testing enterprise systems. * Significant leadership in quality/performance engineering.
Define and implement scalable test strategies across UI, API, performance, and integration layers
Define and implement scalable test strategies across UI, API, performance, and integration layers
Proven experience with API design and collaboration with backend teams
Proven experience with API design and collaboration with backend teams
Own the delivery of automated solutions for UI, API, database, performance and integration testing * Hands-on experience automating API, UI, backend and non-functional test scenarios
Own the delivery of automated solutions for UI, API, database, performance and integration testing * Hands-on experience automating API, UI, backend and non-functional test scenarios
Comfortable collaborating closely with backend teams to align API design with mobile constraints
Comfortable collaborating closely with backend teams to align API design with mobile constraints
Solid understanding of secure coding practices and API design.
Solid understanding of secure coding practices and API design.
Build and manage automated testing frameworks for web, mobile, API, and performance testing * You will have demonstrated experience building automated test frameworks for web and API testing.
Build and manage automated testing frameworks for web, mobile, API, and performance testing * You will have demonstrated experience building automated test frameworks for web and API testing.
Build and manage automated testing frameworks for web, mobile, API, and performance testing * You will have demonstrated experience building automated test frameworks for web and API testing.
Build and manage automated testing frameworks for web, mobile, API, and performance testing * You will have demonstrated experience building automated test frameworks for web and API testing.
Work closely with backend engineers and product teams to create seamless, API-driven UI workflows
Work closely with backend engineers and product teams to create seamless, API-driven UI workflows
Familiarity with scalable API development (REST/GraphQL)
Familiarity with scalable API development (REST/GraphQL)
Design and optimize API interactions using REST and GraphQL * Comfort using tools like Postman, Swagger UI, or GraphQL playgrounds for API testing
Design and optimize API interactions using REST and GraphQL * Comfort using tools like Postman, Swagger UI, or GraphQL playgrounds for API testing
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Senior Backend Developers ( Serverless/Python)
Senior Backend Developers ( Serverless/Python)
Ocho
Belfast, County Antrim
£100,000 - £120,000 per annum
Contribute to API development (REST/GraphQL) and data integration pipelines * Deep understanding of AWS serverless tools (Lambda, DynamoDB, API Gateway, etc.) * Familiarity with GraphQL APIs and scalable API design
Contribute to API development (REST/GraphQL) and data integration pipelines * Deep understanding of AWS serverless tools (Lambda, DynamoDB, API Gateway, etc.) * Familiarity with GraphQL APIs and scalable API design
Ruby on Rails Team Lead - Location: Remote (NI ) Permanent - Competitive salary + equity options available - Contact: Ryan Quinn on LinkedIN - OCHO - Building Teams - The Company - Join a global software business with over 300 staff across 9 countries, building beautifully engineered platforms used by some of the world's most recognisable brands. Their product suite powers scheduling, communication, and team coordination at scale - simplifying operations and boosting engagement across industries. They're scaling one of their core engineering teams and looking for a hands-on Ruby on Rails leader to take the reins. The Role - This isn't a "steer-from-the-sidelines" kind of job. You'll lead a small, high-performing team while remaining technically sharp - delivering production code, mentoring engineers, and guiding product direction.
Ruby on Rails Team Lead - Location: Remote (NI ) Permanent - Competitive salary + equity options available - Contact: Ryan Quinn on LinkedIN - OCHO - Building Teams - The Company - Join a global software business with over 300 staff across 9 countries, building beautifully engineered platforms used by some of the world's most recognisable brands. Their product suite powers scheduling, communication, and team coordination at scale - simplifying operations and boosting engagement across industries. They're scaling one of their core engineering teams and looking for a hands-on Ruby on Rails leader to take the reins. The Role - This isn't a "steer-from-the-sidelines" kind of job. You'll lead a small, high-performing team while remaining technically sharp - delivering production code, mentoring engineers, and guiding product direction.