Senior SIEM & Detection Engineer

Description Senior SIEM & Detection Engineer (Contract)Mandatory Shift: 3:00 PM – 11:00 PM EDTContract Length: 6 months (extension possible)Work Model: RemoteStart: ASAPThe goal is to leave the environment cleaner, quieter, and more defensible than it is today.Why This Role ExistsWe are stabilizing and improving a large Microsoft-based detection environment as part of a broader Cyber Defense maturity initiative. Before formalizing long-term documentation and governance, we need to clean up detection quality, reduce noise, and improve confidence in our security signals—especially during after-hours coverage.This role is Phase 1 of that effort.What This Person Will DoThis is a Senior, hands-on SIEM / detection engineering role, not an analyst position. Primary Focus Areas Tune and rationalize alerts in Microsoft Sentinel and Microsoft Defender XDRReduce false positives and alert fatigueImprove signal quality and detection confidenceIdentify redundant, outdated, or low-value detectionsValidate detections against real telemetry and execution contextProvide engineer-level coverage during the 3–11 PM EDT shiftCapture baseline detection logic and data dependencies as part of cleanup workCore Technical Requirements (Must Have)Strong, hands-on experience with Microsoft SentinelKQL authoring and optimizationAnalytic rule tuningExperience with Microsoft Defender XDRAlert interpretation and correlation This Person Must Also Have Proven background in SIEM alert tuning and detection engineeringAbility to work independently and make judgment calls on detection valueComfortable operating in a live SOC environment during off-hours Nice To Have's Experience in regulated or audit-heavy environmentsFamiliarity with ServiceNow or Jira-based intake/work trackingExperience working with multiple SIEM instances (e.g., security + fraud)Exposure to Microsoft Security Copilot (not required)Measurable reduction in alert volume and noiseImproved confidence in high-priority detectionsClear identification of detection gaps and weak signalsCleaner baseline ready for formal documentation and lifecycle governanceStrong after-hours engineering coverageThis is a hands-on engineering role, not advisorySuccess is measured by outcomes, not ticket volumeThis role feeds a larger, well-defined roadmap—work done here will matter Experience Level Expert Level Job Type & Location This is a Contract position based out of Appleton, WI. Pay And Benefits The pay range for this position is $55.00 - $70.00/hr. Requirements Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: Medical, dental & vision Critical Illness, Accident, and Hospital 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available Life Insurance (Voluntary Life & AD&D for the employee and dependents) Short and long-term disability Health Spending Account (HSA) Transportation benefits Employee Assistance Program Time Off/Leave (PTO, Vacation or Sick Leave) Workplace Type This is a fully remote position. Application Deadline This position is anticipated to close on Jun 19, 2026. About TEKsystems We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law. About TEKsystems And TEKsystems Global Services We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.