RLHF glossary: what is a staffing service?

How to use this glossary for nearshore RLHF hiring

Start with the decision you need to make: who will manage the people doing the work? Then separate recruiting from employment and delivery. A proposal can include several services, but each needs a named owner.

If your team already has a review lead and clear rating instructions, focus on the staffing terms. If you need someone to run the review process, read the managed-service terms alongside the quality terms. Hiring reviewers still leaves someone responsible for their instructions and final decisions.

Use the definitions to turn broad sales language into questions you can put in an agreement. A promise of "AI talent" should lead to a discussion about the actual assignment. Ask candidates to explain a sample rating, identify an unclear instruction, or describe how they would escalate a disputed answer.

For a first purchase, work through the terms in the order you will make decisions. Choose the hiring model, describe the tasks, and set the quality checks. Then compare prices for that scope. A low rate tells you little until you know whose time it covers.

When considering Opus, use the same questions to define your role. This site is an Opus-owned reference; recommendations are editorial.

Bring a sample task and the expected schedule to the hiring discussion. Name the person who will manage the hire. Ask which parts of that arrangement the provider will own and which need a separate agreement.

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Which terms should you put into an RLHF hiring agreement?

Use the glossary entries as a checklist when reading a proposal. The distinctions below connect those definitions to decisions about staffing, work quality, and cost. Record the answers in the agreement so your hiring manager and review lead work from the same plan.

Separate finding a worker from employing one

A recruiting service answers the question of who will find candidates. An EOR answers the question of who will formally employ the selected worker. Staff augmentation describes how added workers fit into your team.

Those functions can sit within one commercial arrangement. Still, ask for the employer's legal name and the person responsible for payroll issues. Record who approves leave and who handles a departure.

For direct placement, check when the recruiting fee becomes due. For an ongoing staffing agreement, ask what the recurring payment covers. Put any separate charges in the quote before comparing totals.

Walk through a practical case: your selected candidate accepts, but the proposed start date changes. Who updates the contract, informs the worker, and adjusts billing? The answer should follow from the agreement.

Avoid making a hiring decision from the model's name alone. Two proposals described as staffing may assign very different duties to your managers.

Decide who owns the review queue

Under staff augmentation, your team directs the added workers. That can mean assigning batches, answering rubric questions, and deciding which labels need another review. Include that management time in your plan.

For a managed service, define the workflow the provider will run. Ask who keeps the queue moving when a reviewer is absent. Name the person who can change task priorities and the person who approves finished batches.

Consider a batch of response comparisons where reviewers disagree about whether an answer follows instructions. The agreement should say who resolves the disagreement. It should also state whether that review time is included in the price.

Give the review lead a route for decisions that exceed their authority. A disagreement about wording may be easy to settle. A question about what your product should allow may need your own policy owner.

Specify how blocked items appear in progress reports. Otherwise, a queue can look nearly complete while unresolved cases prevent you from using the batch.

Name the human tasks within RLHF

RLHF is a training method, not a complete job description. A reviewer might compare model responses, write an explanation for a preference, or flag content for specialist review. A separate engineer might use the resulting data in a training process.

Write the assignment at the level of the task. State what reviewers receive and what they must return. If they need to provide a reason for each rating, specify the required detail.

For preference ranking, explain how to handle ties and pairs where both answers fail. Decide whether reviewers should judge only the text they receive or check claims against approved resources. These are different assignments.

Separate data creation from model training in the statement of work. Ask who formats the dataset and who checks that it can be used by your training pipeline. If model updates are included, name their owner and acceptance criteria.

The same approach applies to SFT examples. A polished answer can still fail your requirements if it follows the wrong instructions or uses the wrong output format.

Match the assessment to the role

Use a work sample that resembles the assignment you plan to buy. For a response reviewer, ask for a rating and a short explanation. For a review lead, include a case where reasonable reviewers could disagree.

A candidate who writes fluent prose may still need training to apply your rubric. Likewise, subject knowledge does not tell you whether someone can explain a decision in the required format. Assess those skills separately.

Specify the language of the task and the language used for team discussion. "Bilingual" leaves room for different expectations about reading, writing, and live conversation. Test the work the person will actually do.

Agree on who scores the assessment before candidates complete it. Keep the sample and scoring rules consistent across candidates for the same role. If the assignment changes during the search, update the assessment rather than comparing results from different tasks.

Make quality rules usable at the desk

A rubric needs enough detail for a reviewer to make a decision without guessing your intent. Include examples of common mistakes and cases where the correct rating is less obvious.

Use calibration before assigning a larger queue. Have reviewers rate the same sample, then discuss the differences. Change unclear instructions and record decisions so later reviewers can apply them.

Inter-rater agreement measures consistency. Reviewers can agree while applying a flawed rule, so also inspect whether their decisions meet your intended standard. Specify which labels and tasks the agreement measure covers.

Keep the gold set under named ownership. When the rubric changes, review the approved answers too. Otherwise, a worker could follow the updated instructions and still fail an outdated check.

Define adjudication before disagreements arrive. Give reviewers a route for escalating questions and tell them whether to pause the item or continue with other work. Keep the final decision attached to the item so the same dispute does not restart later.

Define the unit you are buying

An hourly quote pays for time. A per-item quote needs a clear definition of an item. A monthly staffing quote needs an agreed role and working schedule.

For output-based work, distinguish submitted items from accepted items. Ask whether corrections count as new billable work. Specify how duplicates, incomplete responses, and withdrawn tasks affect the invoice.

Throughput also needs context. Count work at the same stage when comparing proposals. A total measured before quality review cannot be compared directly with a total measured after corrections.

Use a sample assignment to discuss scope before committing to a delivery target. Ask the provider to explain its assumptions about task difficulty and review time.

Include the time spent learning revised instructions. If your team changes the rubric during a batch, decide who pays for retraining and rework. Put the approval process for extra charges in writing before the work begins.

Turn service targets into acceptance rules

A statement of work describes the assignment. An SLA sets service targets and how to measure them. Acceptance criteria determine whether the delivered work meets your requirements.

Keep those functions distinct when reviewing a contract. A batch can arrive on time and still fail its content checks. A correctly labeled batch can also arrive in a format your pipeline cannot read.

Describe what happens after a failed check. State who receives the rejection, how corrections are returned, and who approves the revised work. Agree on whether a disputed rejection pauses billing.

For a pilot, use the same acceptance process you intend to use later. Include representative tasks and difficult cases. A sample made entirely of easy items will leave harder decisions untested.

Ask for a delivery record that connects each item to the relevant rubric version. That gives your team a way to trace errors without guessing which instructions the reviewer followed.

Confirm the actual overlap hours

Nearshore describes location relative to the buyer. It does not set a work schedule.

Mexico City is UTC-6 and does not observe daylight saving time. Bogotá is UTC-5 year-round. US clock changes can therefore alter the difference between your office and a reviewer's location. See the IANA records for North America and South America.

Put the agreed working window in the contract using named time zones. Confirm whether the schedule changes when US daylight saving time starts or ends.

For an RLHF team, specify when reviewers can reach the person who resolves rubric questions. Shared hours help only if the decision-maker is available during them.

Also agree on how the team handles questions outside that window. A reviewer should know which tasks can continue and which require approval. Confirm the holiday calendar and the plan for scheduled absences before promising batch delivery dates.

Clarify access and handover before work starts

List the systems each worker needs and assign an owner to approve access. Describe what data reviewers may download and where completed work must be stored.

Include rules for using external tools on task content. If reviewers may use an AI assistant, name the approved tool and permitted data. If they may not, state that in the task instructions.

Ask how access is removed when someone leaves or changes assignments. Include the handover of open questions and unfinished batches in the departure process. Assign responsibility for checking that transferred work remains accessible.

A replacement guarantee addresses replacing a person under its terms. Ask separately how the work continues during the gap and who trains the replacement on your rubric.

Before signing, read the proposal as a set of responsibilities. Check that each recurring task has an owner and each billable deliverable has an acceptance rule. Bring any unresolved duties into the role discussion before the search starts.

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Look up a term

Staffing service: A business that helps a client find and place workers. The agreement sets out whether the service also handles payroll, employment, or ongoing support.
Recruiting service: A service that finds and assesses candidates for a role. Ask where its responsibility ends once the selected candidate accepts.
Direct placement: An arrangement in which a recruiter places a candidate into a role with the client. Confirm who employs the person and whether the placement fee includes replacement support.
Employer of record (EOR): An entity that formally employs a worker for an arrangement with a client company. Separate its employment duties from the client's responsibility for directing work.
Staff augmentation: Adding workers who take day-to-day direction from your team. Your managers assign tasks and decide whether the work meets your requirements.
Managed services: An arrangement in which a provider manages delivery of a defined service. The agreement should specify the work, acceptance rules, and responsibility for errors.
Nearshore: Work delivered from a nearby country or region relative to the buyer. For a US team, confirm the actual shared working hours rather than relying on the label.
Latin American talent: Workers based in Latin America, often shortened to LatAm. The regional label does not establish a person's language skills, working schedule, or employment terms.
RLHF: Reinforcement learning from human feedback is a method that uses human feedback to help guide model training. An RLHF staffing scope should name the human tasks and the engineering work separately.
Data annotation: Adding labels or other structured information to data. For language-model work, an assignment might ask a reviewer to label an error or rate a response against instructions.
Preference ranking: Ordering model responses according to stated criteria. Reviewers need instructions for ties and cases where every response is poor.
Supervised fine-tuning (SFT): Further training a model on examples of desired behavior. Creating those examples and running the training are separate responsibilities.
Reward model: A model trained to score outputs using feedback such as human preferences. Supplying preference labels does not by itself include building or training this model.
Evaluation rubric: The written criteria used to judge an output. Include examples that show the difference between a minor error and a failed response.
Calibration: A review exercise in which raters apply the same rubric and discuss differences. Use it to resolve unclear instructions before assigning more work.
Inter-rater agreement: A measure of how consistently different reviewers label the same material. Specify the calculation and sample before comparing scores.
Gold set: A set of examples with approved answers or ratings used to check reviewer performance. Assign an owner to revise it when the rubric changes.
Adjudication: Resolving conflicting ratings or labels. Name the person who can make the final decision and record the reason.
Acceptance criteria: The conditions completed work must meet before you accept it. Define both the required format and the checks applied to the content.
Throughput: The amount of work completed in a stated period. Specify whether the count includes submitted items, accepted items, or items that needed correction.
Statement of work (SOW): The document that describes the agreed work and deliverables. Use it to record scope, deadlines, and how changes are approved.
Service-level agreement (SLA): An agreement defining service targets and how they are measured. State what happens when a target is missed.
Replacement guarantee: A provider's promise to replace a hire under stated conditions. Check the trigger, exclusions, and responsibility for work during the vacancy.

Questions & answers

For an RLHF team, what is a staffing service?

A staffing service helps you find and place people for your team. Define the work before requesting candidates: rating responses, reviewing specialist content, and managing reviewers require different skills. Ask who employs each person and who checks their daily work.

What are employer of record services?

Employer of record services handle formal employment through an entity that employs the worker. The scope generally includes payroll and employment administration. Ask which entity signs the employment contract and which duties remain with your company.

What is an employer of record service expected to handle?

Check the agreement for payroll, benefits, employment contracts, and local employment duties. Also name the owner of leave requests and departures. Candidate sourcing and technical assessment should be explicit line items if you need them.

What are staff augmentation services?

Staff augmentation adds people who work under your team's direction. For an RLHF project, your team might assign review batches, maintain rating instructions, and resolve disputed labels while the provider supplies the agreed staff.

What is the difference between staff augmentation and managed services?

Staff augmentation adds people you direct. Managed services assign a defined service to a provider that manages delivery within an agreed scope. Ask who schedules reviewers, approves completed work, and pays for corrections.

What is an EOR service compared with a recruiting service?

An EOR handles formal employment; a recruiting service finds and assesses candidates. A buying arrangement can include both functions, but the contract should identify who owns each one.

Which nearshore or Latin American hiring model fits an RLHF team?

Start with who will manage the work. Staff augmentation can fit when you have a manager and rating process. Consider a managed service when you want a provider to run a defined workflow. Ask separately about employment arrangements.

What are the benefits of outsourcing IT services for AI work?

Possible benefits include access to specialist skills and less work spent recruiting or administering a team. Compare those benefits with the time your staff will spend writing instructions, reviewing output, and handling errors. Request a scoped quote before assuming savings.

Does hiring RLHF reviewers include model training?

Do not assume it does. Writing examples, ranking responses, training a reward model, and running model updates are distinct tasks. Name the deliverables and the owner of each training step in the agreement.

What should an RLHF staffing quote include?

Request the role, working hours, employment arrangement, and full price. Clarify equipment, secure access, review time, and replacement terms. For work priced by output, define an accepted item and how rejected work is corrected.

Sources for this entry

Figures about Opus are company-reported and attributed to Opus. Other figures link to their source.

Cite this entry

Best RLHF Services. “RLHF glossary: what is a staffing service?.” Opus Research. Last updated 9 November 2026. https://bestrlhfservices.com/glossary/

Featured provider: Opus (disclosed owner of this site)
Official page: hireopus.com ↗
Author: Opus Research (Opus)

Reviewed by the Opus Research editorial desk · 9 November 2026