NFT Engineer - Performance tester (POS) - Nenagh

Expleo Group; Nenagh; On-site; EUR 60,000 - 90,000; Full time

Job summary

Expleo Group is seeking two Non‑Functional Test Engineers (Senior and Mid‑Level) to support a payments project. The role is fully onsite in Nenagh, Co. Tipperary, Ireland, and will validate performance, stability, scalability and security across cloud‑native, device‑based and payment ecosystem components.

Responsibilities include defining NFRs, executing load and endurance tests, and performing device‑level testing on Android POS devices to ensure end‑to‑end performance and operational integrity.

Responsibilities

• Performance & Load Testing: Define, refine and validate Non‑Functional Requirements (NFRs).
• Performance & Load Testing: Build and execute load, stress, spike, endurance and soak tests on relevant services and flows (SmartPOS Payment App, TMS 3.0, POS TMC, Nexo channels, downstream pipelines).
• Device‑Level Performance Testing: Validate CPU, memory, battery and thermal behaviour of Android POS devices; assess app responsiveness, startup times, network handover and long‑running stability.

Job description

• Execution results & KPI dashboards

Expleo is seeking two Non‑Functional Test Engineers (1 Senior, 1 Mid‑Level) to support one of our latest projects in the POS space. The successful candidates will validate the performance, stability, scalability and security of cloud‑native, device‑based and payment ecosystem components.

These roles operate across the full payments stack — covering Payment App, TMS 3.0, POS TMC, Nexo Retailer/Acquirer protocols, downstream integrations and Android POS device performance. Engineers will ensure that all systems meet enterprise‑grade Non‑Functional Requirements (NFRs) covering load, latency, resilience, device behaviour and operational integrity.

This role is fully onsite in Nenagh, Co. Tipperary.

Responsibilities

• Performance & Load Testing
  • Define, refine and validate Non‑Functional Requirements (NFRs)
  • Build and execute load, stress, spike, endurance and soak tests on~
  • SmartPOS Payment App services
  • TMS 3.0 flows (downloads, commands, updates)
  • POS TMC sync & update flows
  • Nexo Retailer/Acquirer channels
  • Downstream pipelines (IPG, BAM, EventGateway, telemetry integrations)
  • Measure key performance KPIs~
  • Transaction throughput (TPS)
  • End‑to‑end latency (POS → IPG → EventGateway → BAM)
  • Resource utilisation and SLA adherence
• Device‑Level Performance Testing
  • Validate CPU, memory, battery and thermal behaviour of Android POS devices.
  • Assess app responsiveness~
  • Cold/warm start time
  • Network handover performance
  • Long‑running session stability
  • Execute 24/48