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# Software Engineer in Test (SDET)

- **Company:** Citadel LLC
- **Location:** United States
- **Salary:** $175,000.0 - $350,000.0
- **Contract:** Permanent contract
- **Skills:** Automation of Tests, C++ (Programming Language), CMake, Continuous Integration, Software Debugging, Linux, Distributed Systems, Github, Python (Programming Language), Pcap, Networking Basics, Service Virtualization, Wireshark, Git, Apache Kafka, Jenkins, Glasgow Haskell Compiler
- **Published:** June 9, 2026
- **Apply:** https://www.dice.com/job-detail/fd545fe0-de75-4ada-ac72-5b9a523a77c5

## About the Role

* Proven ownership mindset: comfortable debugging unfamiliar systems, writing docs, and driving cross-team initiatives
 * Expert Python for production-grade automation
 * Ability to read/modify C++ test code and hook Python harnesses into C++ components
 * Strong Linux and networking fundamentals (TCP/UDP, sockets, pcap/Wireshark)
 * CI/CD experience (Jenkins/GitHub Actions, Git, CMake); containerized, reproducible test environments
 * Hands-on design of performance/reliability tests (latency, throughput, backpressure) and flaky-test triage
 * Excellent communication and documentation skills

Nice to have

 * FIX engine experience (QuickFIX or proprietary), exchange simulators, OMS/EMS flows, DMA/algos, drop copy
 * Observability for tests (PrometheGrafana/Jaeger/Tempo; log correlation)
 * Data & infra: kdb+/q, Kafka, low-latency instrumentation
 * Rust/Go or FP exposure (Haskell/OCaml); contract testing (Pact) and property-based testing (Hypothesis)
 * Prior experience in financial systems or large-scale distributed environments

## Description

We are embarking on a multi-year strategic effort to modernize the platform's infrastructure. As a Software Engineer in Test, you'll contribute to this transformation by building Python-first frameworks and C++-adjacent hooks to verify distributed systems correctness, accelerate CI/CD, and protect latency-sensitive releases across equities (cash/options) and beyond., * Build test harnesses that simulate client/exchange and OMS order lifecycle workflows across equities cash and options

 * Author automated tests (unit/integration/contract/perf) and grow CI/CD quality gates; make runs deterministic via golden traces/pcaps and time control
 * Design performance/latency test rigs (P50/P99.9, jitter, allocator impact) with reproducible results and automatic regressions gates in CI
 * Create contract tests and service virtualization (exchange simulators, market-data replayers) to decouple teams and speed releases
 * Develop failure-mode/chaos scenarios (disconnects, throttling, slow consumers, sequence resets, clock skew, backpressure)
 * Drive cross-repo test architecture/refactors (shared fixtures, contracts, pipelines) to improve coverage and reliability
 * Partner with development, SRE, and the trading desk to define and automate end-to-end scenarios that verify system correctness and business workflows


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