Model Designer

Description
We're hiring a contingent model designer to extend our core CD / model design crew on MAIBA's language layer - operating with real strategic latitude and carrying day-to-day execution.
Shared ownership, up front: The core CD team owns the north-star quality bar and holds final sign-off, and you'll work within that. But inside it you'll have genuine room to shape frameworks for your focus areas, set priorities, and interpret eval results into model-design action - not just implement prompt rules handed to you. You'll help define and refine what "good" looks like for your conversational surfaces, translate those frameworks into testable system prompt rules, hillclimb on language-driven behavior, and dogfood changes to catch failures before they reach experiment audiences.
This is both a thinking role and a building role: We need someone who can hold the "what good looks like" question and ship the instructions that make the model actually behave that way, sprint over sprint.
Key activities & domains
Shape and refine content frameworks - define the principles that govern how MAIBA should behave in conversation (e.g. "answer first, explain second," "one action per turn") for your focus areas, in partnership with core CD, who approves the north-star bar.
Translate frameworks into model instructions - convert principles into specific, testable system prompts (turning "be actionable" into "always include a specific number and a deeplink").
Hillclimb on language-driven behavior - iteratively improve any behavior controlled by language rather than code: tone, answer structure, length, follow-up prompts, ambiguity and "can't help" handling.
Interpret eval results into model-design priorities - read judge scores and hillclimb readouts and decide what to tune next; this is the feedback loop between measurement and design.
Align partners on the quality bar - get PM, eng, PD, and leadership on the same page about "what good looks like" before the model changes, heading off the "I'll know it when I see it" problem.
Dogfood and triage - exercise the model, surface language-level failures, and partner with eng to flag "big rock" failures before they reach experiment audiences.
Operate within the sprint loop - per 4-week sprint: shape/update the focus framework (week 0), write and refine prompt rules (weeks 1-2), and use judge scores to iterate (weeks 3-4).
Stay consulted on adjacent surfaces - partner (not dictate) on in-response design like widgets, where model handling and visual design intersect; hand Python-explicit behavior (routing, tool calling) to eng.
Domains: conversational quality, personalization, system prompt engineering, advertiser-facing voice (Ads context a plus).
Required skillset
Strong content / UX writing craft and user empathy; reasons about a conversation as an end-to-end experience, not isolated strings.
Hands-on system prompt / LLM behavior iteration - has written and refined prompts and can articulate why a phrasing change shifts model behavior.
Strategic judgment - can hold and refine the "what good looks like" question, not only execute against a given spec; able to operate in ambiguity and set direction for a focus area.
Comfort with shared ownership - works confidently within a defined sign-off gate (core CD approves the north-star bar) while exercising latitude inside it.
Analytical iteration habit - reads judge / eval scores and uses them to prioritize the next change.
Partner alignment - can get PM, eng, and design to a shared quality bar before building.
Fast, high-volume execution under a 4-week sprint cadence.
Nice-to-have: technical writing experience; ads / performance-marketing domain familiarity; prior model design or AI conversation design experience; information architecture background.
Job Type & Location
This is a Contract position based out of Menlo Park, CA.
Pay and Benefits
The pay range for this position is $50.00 - $65.00/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.
Application Deadline
This position is anticipated to close on Jun 30, 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.

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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.