Performance & Reliability Engineer – Banking

Role Overview

• The Core Foundation & Integration (CFI) Tribe implements and delivers the Card Issuing core applications — from Card Issuing lifecycle to Transactions clearing & settlement — for hundreds of banks.
• With over 150 million cards and 1.16 billion monthly transactions, our platforms operate at the forefront of capacity and performance.
• We are looking for an engineer to be the architect and guardian of our Card Issuing solutions’ performance and reliability.
• This is a strategic, hands-on engineering role for someone obsessed with making large-scale distributed systems fast, resilient, and efficient by design.
• You will be the technical cornerstone of our platform’s stability, with the mandate to influence architecture, write code, and solve the most complex performance challenges.
• Review critical solution designs and challenge architectures that present unmitigated performance or reliability risks.
• Architect and operate our centralized performance and load testing platform, providing it as a self-service to development squads.
• Design and lead critical end-to-end performance tests and Chaos Engineering exercises to identify system weaknesses proactively.
• Analyze long-term performance metrics (SLOs) to identify slow regressions and silent bottlenecks, and drive resolution before they become incidents.
• Lead war rooms for performance incidents, using advanced tools (profilers, distributed tracing) to diagnose systemic root causes.
• Recommend solutions and prototype fixes, optimize critical code paths, and demonstrate solutions to development teams.
• Liaise with SRE and operations teams of internal and external clients, building deep technical credibility.

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.

Tech Stack

• AWS
• Cloud
• Distributed Systems
• Google Cloud Platform
• Grafana
• Java
• Kafka
• Oracle
• Postgres
• Prometheus
• Python

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