Senior Technical Ops — APM (Alternative Payment Methods)

About Unlimit

Unlimit is the global fintech powerhouse behind the world’s largest proprietary payments infrastructure.
Founded in 2009, Unlimit operates across 17 global offices with 700+ experts, seamlessly integrating 1,000+ payment methods into a single platform. From London to São Paulo, we empower businesses to scale across borders with a unified suite of financial tools — including payment processing, alternative payment methods, multicurrency business accounts, card issuing, banking-as-a-service, and crypto on- and off-ramps.
Our mission is to break down financial barriers and enable seamless money movement across borders. We give forward-thinking businesses the tools to accept, send, and manage payments effortlessly, wherever they operate.

Role Overview

The Senior Technical Support Engineer specializing in Alternative Payment Methods (APM) is a critical technical role responsible for the stability, performance, and reliability of all APM integrations within our PSP/fintech ecosystem.

This engineer acts as the top-tier technical expert for merchants, internal Product/Engineering teams, and external payment partners. The primary focus is on resolving complex incidents, driving deep root-cause analysis (RCA), leading operational improvements, and guaranteeing seamless, high-volume transaction processing for all supported APMs.

Success in this role requires advanced technical proficiency, superior analytical skills, and the ability to articulate complex issues clearly to both technical and non-technical audiences.

Areas of Responsibility:
• 1. Expert Incident & Problem Management
• Serve as the highest escalation point for all critical APM-related issues across production and sandbox environments.
• Conduct in-depth troubleshooting of complex transaction failures, including authorization declines, settlement discrepancies, callback issues, and routing problems.
• Perform real-time analysis using logging and monitoring tools (Kibana, Datadog, Grafana, Splunk) to quickly diagnose system anomalies and errors.
• Coordinate incident resolution efforts with Engineering and DevOps, focusing on swift mitigation and long-term recurrence prevention.
• Lead emergency response protocols during major outages impacting APM transaction flows.Execute deep-dive Post-Incident Root Cause Analysis (RCA) and present findings to Product and Engineering teams.
• 2. APM Performance & Monitoring
• Develop, maintain, and optimize monitoring dashboards, alerts, and system health checks specific to APMs.
• Analyze key performance indicators (KPIs) such as success rates, latency, and drop-off rates to identify and propose systemic improvements.
• Drive proactive detection initiatives to flag merchant-level or provider-level processing issues before they escalate into incidents.
• 3. Integration & Merchant Suppor
• Provide senior-level technical consultation to merchants integrating various APMs (e.g., Pix, Sofort, iDeal, Klarna, local wallets).
• Review and validate API specifications, payload structures, webhook configurations, and authentication mechanisms.
• Assist with integration test scenarios and required APM certification processes.
• 4. Operational Excellence & Automation
• Propose and drive solution implementations (automation, tooling, configuration changes, or product enhancements) to reduce recurring incidents and operational friction.
• Create and maintain comprehensive documentation, including detailed runbooks, troubleshooting guides, and standard operational procedures.
• Promote operational excellence through standardization and knowledge sharing.
• 5. Cross-Functional Collaboration
• Serve as the technical APM subject matter expert for Product Managers, Engineering, Compliance, and Partner Management teams.
• Provide support insights that influence product backlog prioritization and roadmap decisions.
• Articulate APM-specific technical constraints, regional nuances, and compliance requirements to internal stakeholders.
• 6. External Partner Liaison
• Act as the primary technical point of contact with APM providers and acquirers.
• Manage and escalate persistent technical issues, ensuring adherence to partner SLAs.
• Validate the impact of provider updates, maintenance schedules, and API changes on our merchant base.

Required Skills & ExperienceTechnical Expertise:
• Payment Systems: Deep, hands-on understanding of payment processing workflows, specifically APM models and related regional payment regulations.
• APIs & Data: Proven experience with REST APIs, webhooks, JSON, and authentication protocols.
• Monitoring & Logging: Proficiency with enterprise-grade monitoring and logging systems (Datadog, Grafana, Kibana, ELK Stack, Splunk).
• Data Analysis: Strong proficiency in SQL for complex transactional data analysis.
• Coding: Ability to read and debug code snippets (e.g., Python, Node.js, Java).
• Infrastructure (Plus): Familiarity with microservices architecture, cloud environments (AWS/GCP), and CI/CD pipelines.

Professional Experience:
• 4–7+ years in a senior technical support, payments engineering, or integration engineering role.
• Essential: Prior experience within a high-volume PSP, fintech, or banking environment is strongly preferred.
• Experience supporting global payment methods and managing high-traffic systems.

Key Competencies:
• Exceptional problem-solving, analytical, and critical-thinking abilities.
• Outstanding written and verbal communication, capable of distilling complex technical concepts.
• Demonstrated ability to remain calm and effective while managing critical incidents under pressure.
• High sense of ownership, bias for action, and commitment to operational improvements.

Success Metrics:
• Reduction in the Mean Time to Resolution (MTTR) for APM incidents.
• Successful achievement of high SLA resolution rates for merchant and internal support tickets.
• Measurable improvement in overall APM transaction success rates and system reliability.
• Positive results in cross-team collaboration surveys and knowledge-sharing initiatives.
• High merchant satisfaction scores (CSAT/NPS) related to APM support.

Join Unlimit Team now!

Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.