Senior Performance Engineer

Why choose this offer?International working environmentFreedom in terms of collaboration between team membersScandinavian organizational culture providing you with work-life balanceGetting to know how does the financial products and market works ProjectWe are looking for a Senior Performance Engineer to join our team embedded within a major European financial infrastructure provider. The ideal candidate combines deep performance engineering expertise with a strong production support mindset, capable of operating independently across complex distributed systems in a regulated financial environment. This role requires someone who can own the full performance lifecycle: from test design and execution through production observability, bottleneck identification, and root cause analysis. Key ResponsibilitiesPerformance Testing & AnalysisDesign, develop, and execute performance test scenarios for complex financial trading and clearing systemsBuild and maintain performance test suites using tools such as k6, JMeter, Gatling, or equivalentAnalyze test results to identify throughput limits, latency bottlenecks, resource saturation, and concurrency issuesProduce clear, data-driven performance reports with actionable recommendations for development and infrastructure teamsEstablish and maintain performance baselines, SLAs, and regression detection criteria Production Observability & Incident SupportBuild and maintain dashboards and alerting using observability platforms (e.g. Prometheus, Grafana, Splunk, AppDynamics, or similar)Perform real-time production triage and root cause analysis during performance incidentsCorrelate metrics across application, infrastructure, and network layers to isolate degradation sourcesSupport capacity planning by analyzing production traffic patterns, growth trends, and resource utilizationCollaborate with SRE, infrastructure, and development teams to resolve performance issues in production Architecture & AdvisoryProvide performance-focused input during architecture reviews and design discussionsIdentify systemic performance risks in distributed architectures (microservices, messaging, databases)Advocate for performance engineering best practices across the organizationContribute to the evolution of the performance engineering toolchain and methodology Required Technical SkillsCore Performance Engineering10+ years of hands-on performance engineering experience, preferably in banking or financial servicesExpert-level proficiency in at least one performance testing tool (e.g. k6, JMeter, Gatling, Locust), or demonstrated ability to leverage AI-assisted development to rapidly build and ensure quality of test scripts in any of these toolsGood understanding of HTTP/REST, WebSocket, and messaging systems (e.g. Kafka, MQ). Familiarity with FIX protocol is a plusExperience with load modeling, workload characterization, and capacity planningProficiency in at least one scripting language for test automation (e.g. JavaScript/TypeScript, Python, or Bash) Observability & MonitoringProduction experience with at least one APM tool (e.g. AppDynamics, Dynatrace, New Relic, or equivalent)Hands-on experience with metrics and monitoring platforms such as Prometheus and Grafana, or equivalent observability stackExperience with centralized log management and analysis (e.g. Splunk, ELK, or similar)Understanding of distributed tracing concepts and tools (e.g. OpenTelemetry, Jaeger, Zipkin) Infrastructure & PlatformWorking knowledge of Linux systems administration and performance tuning (CPU, memory, I/O, network)Experience with containerized environments (e.g. Docker, Kubernetes)Familiarity with CI/CD pipelines and integrating performance tests into delivery workflowsExposure to cloud platforms and/or infrastructure-as-code tools is a plus Data & AnalysisStrong analytical skills with the ability to interpret complex datasets and correlate multi-signal performance dataExperience with SQL databases and understanding of database performance tuning (e.g. query optimization, indexing, connection pooling)Comfortable working with time-series data, percentile analysis, and statistical methods for performance assessment Desired Qualities & Soft SkillsSelf-starter who can operate independently with minimal supervision in a client-facing contractor roleExcellent written and verbal communication skills in English; ability to produce clear technical reports and present findings to senior stakeholdersProactive problem-solver who takes ownership of issues from detection through resolutionExperience working in regulated environments (e.g. banking, financial markets, exchanges) with an understanding of change management and audit requirementsCollaborative mindset with the ability to work across distributed, multicultural teamsContinuous learner with interest in emerging technologies such as AI/ML for observability, cloud-native performance patterns, or chaos engineering Nice to HaveExperience with financial market infrastructure (exchanges, clearing houses, settlement systems)Familiarity with FIX protocol and low-latency trading systemsKnowledge of OpenTelemetry and modern observability standardsExperience building custom performance analysis tooling or automation frameworksContributions to open-source performance or observability projectsISTQB Performance Testing certification or equivalent  Client – why choose this particular client from the Jit portfolio?Jit Team is proud to partner with one of the leading European financial groups responsible for the registration, ownership records, and financial settlement of securities traded on financial markets in Norway and recently extended to other European markets. Jit Team has been a strategic partner to our client in the area of software development since 2017. Over the course of the partnership, Jit Team's dedicated team working for our client has grown from three to over 30 people, who have worked on the modernization of legacy applications, the implementation of new systems, and the development of a private cloud-based platform to host a variety of financial systems.