API Integration Engineer

Job description

The API Engineering Consultant is a key member of the Implementation & Consulting Department, responsible for enabling seamless connectivity between ADP solutions and client enterprise systems. The role helps organizations maximize the value of their HCM, HR, payroll, and workforce management investments by designing, developing, and supporting secure, scalable, and reliable API-based integrations.

Key responsibilities

API Engineering Development and implementation of REST-based APIs and integration services Creation and processing of JSON data structures Implementation of authentication and security mechanisms such as OAuth 2.0, API keys, and token-based authentication

• Use of webhooks and event-driven integration scenarios
• Design and implementation of error handling, monitoring, and logging Ensuring performance, stability, and security of integration solutions Data Management and Integration Creation and maintenance of data models and data mappings Execution of data validations and quality assurance measures Creation and optimization of SQL queries Analysis and documentation of data flows and interface requirements Knowledge Development and Internal Consulting Supporting the development of internal API and integration expertise Creating standards, templates, and best practices Coaching and mentoring team members Conducting internal training sessions and knowledge transfer workshops Contributing to the advancement of integration methods and technical standards Professional skills/experience requirements: API and Integration Technologies In-depth knowledge of REST APIs and API architectures Experience with JSON and web-based interfaces
• Strong knowledge of authentication methods: OAuth 2.0 API Keys Access Tokens Understanding of HTTP protocols and methods (GET, POST, PUT, DELETE) Experience with webhooks and event-driven integration processes Expertise in error analysis and API troubleshooting Programming Experience with one of the following technology stacks: JavaScript Ecosystem JavaScript REST frameworks Development of integration solutions or Python Ecosystem Python FastAPI API development and automation Databases Strong SQL skills Data modeling and table structures Data and interface mapping Data validation and data quality assurance Logging and error analysis Integration and Testing Tools Postman Bruno API testing and error analysis Cloud and Infrastructure Basic understanding of hosting concepts
• Knowledge of SSL certificates Networking fundamentals Firewall and connectivity concepts Cloud infrastructures and modern deployment concepts Further desired Qualifications Experience with HCM, HR, or payroll integrations Experience with SaaS solutions and cloud applications
• Knowledge of Microsoft Azure, AWS, or Google Cloud Basic knowledge of DevOps and CI/CD processes Experience in consulting, professional services, or implementation projects Personal skills/competencies Very good mastery of English languages, both orally and written, at minimum B2+ German language is a plus
• Excellent communication skills at both technical and business levels
• Strong analytical and problem-solving skills Client and service-oriented mindset Team-oriented and collaborative working style
• Ability to work independently in a structured manner
• Strong willingness to learn and interest in new technologies