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Performance & Reliability Engineer
Expleo Group. Implementing and delivering the Card Issuing core applications — from Card Issuing lifecycle to Transactions clearing & settlement.
Tech Stack
Tools & technologiesAWSCloudDistributed SystemsGoogle Cloud PlatformGrafanaJavaKafkaOraclePostgresPrometheusPython
About the role
Key responsibilities & impact- 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
What you’ll need- 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
Comp & perks- Holiday Voucher
- Private medical insurance
- Performance bonus
- Easter and Christmas bonus
- Employee referral bonus
- Bookster subscription
- 7card
- Work from home options depending on project
ATS Keywords
✓ Tailor your resumeApplicant 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