Senior SIEM & Detection Engineer

Description
Senior SIEM & Detection Engineer (Contract)
Mandatory

Shift: 3:00 PM - 11:00 PM EDT
Contract Length: 6 months (extension possible)
Work Model:
Remote
Start: ASAP
The goal is to leave the environment cleaner, quieter, and more defensible than it is today.
Why This Role Exists
We 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 Do
This 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 XDR
Reduce false positives and alert fatigue
Improve signal quality and detection confidence
Identify redundant, outdated, or low-value detections
Validate detections against real telemetry and execution context
Provide engineer-level coverage during the 3-11 PM EDT shift
Capture baseline detection logic and data dependencies as part of cleanup work
Core Technical Requirements (Must Have)
Strong, hands-on experience with Microsoft Sentinel
KQL authoring and optimization
Analytic rule tuning

Experience with Microsoft Defender XDR
Alert interpretation and correlation
This person must also have:
Proven background in SIEM alert tuning and detection engineering
Ability to work independently and make judgment calls on detection value
Comfortable operating in a live SOC environment during off-hours
Nice to Have's:
Experience in regulated or audit-heavy environments
Familiarity with Service Now or Jira-based intake/work tracking
Experience working with multiple SIEM instances (e.g., security + fraud)
Exposure to Microsoft Security Copilot (not required)
Measurable reduction in alert volume and noise
Improved confidence in high-priority detections
Clear identification of detection gaps and weak signals
Cleaner baseline ready for formal documentation and lifecycle governance
Strong after-hours engineering coverage
This is a hands-on engineering role, not advisory
Success is measured by outcomes, not ticket volume
This 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.
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.
Final date to receive applications
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

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age,…