Senior System Engineer

App Card Inc. is a technology and marketing company headquartered in Manhattan, NY. Appcard has a powerful marketing tool that leverages data acquired at the point of sale (POS) via an advanced rewards program to create advanced retargeting campaigns that help businesses increase their bottom line. App Card is unique in the loyalty space due to its patented technology which allows businesses to capture shopper identity and item level data in realtime from purchases made in store and online.

The benefit of this is two fold: consumers benefit by receiving offers, incentives and coupons. Through a shopper’s interactions with the former App Card’s platform records and learns shopper behavior and gives grocers the ability to make their data actionable to increase average basket size and systematically increase repeat purchases.

App Card is seeking a Senior Systems Engineer with strong expertise in Linux systems, infrastructure automation, and TCP/IP–based network troubleshooting, supporting production environments and customer-facing POS integrations.

This is a hands‑on operational role responsible for system reliability, automation, and advanced incident resolution across Linux infrastructure, POS networks, and data pipelines. The role works closely with Engineering, Product, Customer Success, and Support to ensure platform stability and an excellent customer experience.

• Administer, monitor, and troubleshoot Linux‑based production and customer‑facing systems supporting POS integrations
• Design, implement, and maintain Ansible‑based automation for configuration management, deployments, and system consistency
• Diagnose and resolve TCP/IP protocol‑level issues
  , including routing, connectivity, latency, packet loss, and network performance problems
• Troubleshoot POS environments
  , including store networks, on‑prem systems, and data transmission between POS, edge devices, and cloud services
• Act as an escalation point for complex or recurring incidents, performing root‑cause analysis and driving long‑term remediation
• Perform database troubleshooting, including SQL querying, data validation, and basic performance analysis
• Collaborate with Engineering on incidents involving infrastructure, configuration, or application‑level defects
• Use monitoring and observability tools to identify, analyze, and resolve system and performance issues
• Document system architecture, operational procedures, runbooks, and customer‑facing technical guidance
• Build and maintain internal and external technical knowledge bases
• Manage multiple concurrent issues while providing clear, timely communication to customers and internal stakeholders
• Participate in off‑hours and weekend on‑call rotations for mission‑critical systems

• Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience)
• Strong hands‑on experience with Linux system administration in production environments
• Proven experience with Ansible for automation and configuration management
• Solid understanding of the TCP/IP protocol stack and hands‑on troubleshooting at the protocol level
• Experience supporting or integrating with POS systems or retail technology environments
• Working knowledge of databases, including SQL querying and troubleshooting
• Familiarity with system monitoring, logging, and alerting tools
• 3+ years of experience in Systems Engineering, Technical Operations, or advanced Technical Support roles
• Strong analytical and problem‑solving skills
• Excellent written and verbal communication skills with a customer‑first mindset
• Highly organized and able to manage multiple priorities in a fast‑paced environment

• Experience using Grafana for monitoring, dashboards, and operational visibility
• Experience working with Salesforce, particularly in support, case management, or operational workflows
• Exposure to IoT, edge devices, or distributed retail environments
• Scripting experience (Bash, Python)

This position requires off‑hour support and weekends.

** This role is full‑time from the office in NYC**