Expleo Group

Performance & Reliability Engineer

Expleo Group

full-time

Posted on:

Location Type: Hybrid

Location: Bucharest • Romania

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Tech Stack

AWSCloudDistributed SystemsGoogle Cloud PlatformGrafanaJavaKafkaOraclePostgresPrometheusPython

About the role

  • Implementing and delivering the Card Issuing core applications — from Card Issuing lifecycle to Transactions clearing & settlement.
  • Architecting and guarding performance and reliability of Card Issuing solutions.
  • Being the technical cornerstone of the platform’s stability, influencing architecture, writing code, and solving performance challenges.
  • Reviewing critical solution designs and challenging architectures with performance or reliability risks.
  • Architecting and operating centralized performance and load testing platform.
  • Designing and leading critical end-to-end performance tests and Chaos Engineering exercises.
  • Analyzing long-term performance metrics (SLOs) to identify regressions and drive resolution.
  • Leading war rooms for performance incidents, diagnosing systemic root causes.
  • Recommending solutions, optimizing critical code paths, and demonstrating fixes to development teams.
  • Liaising with SRE and operations teams of internal and external clients.

Requirements

  • 5+ years of proven experience with deep, hands-on expertise in a language like Java, or Python.
  • Knowledge of legacy and public cloud environments (GCP, AWS).
  • Deep understanding of large-scale distributed systems: concurrency, queuing, caching, consistency, and failure modes.
  • Expertise across communication patterns: synchronous/high-throughput APIs, event-driven architectures (Kafka), and large-scale batch processing.
  • Expertise in Application Performance Monitoring, database performance optimization (Oracle, PostgreSQL), network analysis, and low-level system performance.
  • Proficiency with observability tools: Prometheus, Grafana, and distributed tracing frameworks.
  • Strong technical leadership: ability to mentor senior engineers and influence architecture decisions across multiple teams.
  • Excellent communication skills — able to explain complex technical concepts clearly to diverse audiences.
  • Strong ownership mindset with a bias for action and measurable delivery.
  • Full professional proficiency in English.
  • Experience in the payments or card issuing domain.
  • Background in chaos engineering tooling or reliability frameworks (e.g., SRE practices, SLO/SLA management).
  • Experience mentoring or coaching engineering teams on performance best practices.
Benefits
  • Holiday Voucher
  • Private medical insurance
  • Performance bonus
  • Easter and Christmas bonus
  • Employee referral bonus
  • Bookster subscription
  • 7card
  • Work from home options depending on project
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
JavaPythonApplication Performance Monitoringdatabase performance optimizationnetwork analysisdistributed systemsevent-driven architecturesperformance testingchaos engineeringperformance metrics
Soft Skills
technical leadershipcommunication skillsownership mindsetmentoringinfluencing architecture decisionsproblem-solvingcollaborationdiagnosing root causesexplaining technical conceptsbias for action