Implementation Manager

As an Implementation Manager, you will take full ownership of the merchant onboarding and integration journey after pre-sales closes the technical design.

You will prepare integration packages, build go-live plans, answer technical questions, coordinate internal teams for product developments, and ensure high-quality and on-time merchant go-lives.

You will be measured not only by the speed of onboarding but also by the quality of the go-live - making sure every flow, exception, and integration need is correctly addressed and tested. Responsibilities

• Prepare and deliver a full Statement of Work (SOW) for the merchant, including:
• Test credentials
• API documentation
• Integration diagrams
• Any project-specific technical material
• Define and align a Go-Live Timeline:
• Work with the merchant to break down the project into phases (if needed)
• Identify key milestones, dependencies, and risks
• Be the merchant’s main technical point of contact during integration:
• Support the merchant’s technical team with questions, troubleshooting, best practices, and clarifications
• Own and push timelines:
• Ensure the merchant and internal teams are meeting the project deadlines
• Actively manage risks, delays, and escalations
• Collaborate closely with the Product and Engineering teams to:
• Escalate and prioritize integration blockers
• Follow up on new developments and product features required by the merchant
• Build UAT (User Acceptance Testing) matrices:
• Internal-facing UAT matrices to align Product teams on the development acceptance criteria
• Merchant-facing UAT matrices to ensure the merchant tests every critical payment flow and use case
• Drive a clean go-live process:
• Monitor launch success
• Ensure operational readiness of all flows (payment success, failure handling, refunds, tokenization, etc.)
• Post-go-live support:
• Stay engaged for 3 weeks after go-live to ensure stability before handing off the account.

• 3+ years of experience in technical project management, technical account management, merchant integrations, or technical consulting - preferably in Fintech, Payments, or SaaS companies.
• Strong technical understanding of payment integrations (APIs, SDKs, payment gateways, fraud vendors, alternative payment methods).
• Exceptional project management skills: timeline creation, stakeholder management, risk mitigation.
• Client-facing experience: comfortable leading technical conversations with merchant engineering teams.
• Organized and proactive: capable of running multiple integration projects at the same time.
• Experience with UAT planning and test case validation.
• Fluent in Spanish and English.
• Startup or high-growth tech environment experience is a plus.

About DEUNA 🧡 DEUNA is a rapidly growing startup revolutionizing global commerce with ATHIA, our AI-powered orchestration and payments platform that helps large enterprises boost approval rates, reduce costs, and unlock new revenue. Built by the team behind DEUNA-the fastest-growing Commerce OS in Latin America-ATHIA combines payment intelligence, checkout optimization, and data orchestration in one powerful solution. With deep integrations across 300+ PSPs and alternative payment methods, and over 20% of Mexico’s digital economy running through our platform, we simplify global payments through a single integration and centralized reconciliation. We are a rapidly growing startup expanding into the U.S. to meet the urgent needs of large retailers, marketplaces, airlines, and QSRs. Join us to shape the future of payments! 🚀 Visit https://www.deuna.com/ to learn more about us! About the Role