Senior API Integration Lead / Integration Architect

Location: Remote
English: B2+
Level: Senior
Format: Full-time, Outstaff
Engagement: 30–40 hours per week
Contract: 6+ months with the possibility of extension
Compensation: $30–40/hour (Gross)
Time Zone: Several hours of overlap with US Eastern Time (ET)
Start: ASAP
About the Project
We are looking for a Senior API Integration Lead / Integration Architect to join our international client's project on an outstaff basis.
The project focuses on integrating Core GMS with external systems related to competitions, rankings, federations, training, and payments.
The main focus is on designing and implementing reliable API integrations, ensuring consistent data exchange between different systems, and preventing duplicate records.
Responsibilities
Design and implement API integrations between Core GMS and external systems.
Work with REST APIs, authentication protocols, webhooks, and messaging queues.
Ensure reliable data exchange and consistency across integrated systems.
Implement idempotency mechanisms and record-matching logic to prevent duplicate records.
Participate in integration testing, including contract testing.
Support and troubleshoot integrations in production environments.
Requirements
5+ years of experience in API integrations.
Strong understanding of REST APIs.
Hands-on experience with OAuth2 / OIDC.
Knowledge of OpenAPI specifications.
Experience working with webhooks and messaging queues.
Understanding of idempotency principles and data synchronization between systems.
Experience with contract testing.
Experience designing record-matching mechanisms to prevent duplicate records across different systems.
Practical experience in designing, testing, and supporting integration solutions in production environments.
English level B2+ for communication with the client and technical teams.
Availability to work with several hours of overlap with US Eastern Time (ET).
Important: We are particularly interested in candidates who can demonstrate their personal contribution to integration design, testing, and ongoing production support.
What We Offer
🚀 Remote / Full-time / Long-term collaboration
🤝 The opportunity to work on an international client project
💡 High level of autonomy and the opportunity to have a direct impact on your work
🏖 21 paid vacation days + 10 paid sick leave days + Ukrainian public holidays
🗣 Individual English lessons
💊 Medical insurance for employees based in Ukraine (after 3 months of cooperation)
📚 Safari Books Online subscription
🧠 Corporate psychologist sessions
📚 $300 annual learning and professional development budget
🎓 Trainings, workshops, and mentorship opportunities
Recruitment Process
CV Review — We review your experience and share relevant CVs with the client for initial consideration.
Technical Assessment — If your profile is approved, we will arrange a technical assessment with the client to evaluate your practical experience and expertise in API integrations.