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The best sales outsourcing company for a US team depends on one question. Do you want a provider to run outbound for you, or do you want dedicated reps who work inside your team? This guide compares 12 providers across four models. It then gives you 15 questions to ask before you sign anything.
Disclosure: Remote Growth Partners publishes this guide and is listed first. Every provider, including us, is shown with its strengths, its limits and the buyer it fits best, so you can judge for yourself.
Quick answer: Pick the model before you pick the vendor. If you want dedicated offshore SDRs who are vetted and managed for you, look at a managed placement firm like Remote Growth Partners. If you want an agency to run campaigns and hand you meetings, look at CIENCE, Belkins, Martal Group, SalesHive or Callbox. If you want to manage reps yourself and only need help hiring, look at HireWithNear, GrowthAssistant or CloudTask.
The Four Sales Outsourcing Models
Most bad outsourcing decisions start with the wrong model, not the wrong vendor. Each model puts day-to-day management in a different place.
| Model | Who manages the reps | Best when | Providers in this guide |
|---|---|---|---|
| Managed SDR placement | The provider vets, places and oversees full-time reps who work only for you | You want reps embedded in your team without running hiring, payroll and QA yourself | Remote Growth Partners |
| Outsourced SDR agency | The agency runs campaigns with its own team and reports results to you | You want meetings on the calendar and are happy for an outside team to own outreach | CIENCE, Martal Group, Belkins, SalesHive, Callbox, MarketStar, Sales Partnerships, Inc. |
| Staffing and augmentation | You manage the rep day to day. The provider sources, vets and often handles payroll | You already have a sales manager and a working playbook | HireWithNear, GrowthAssistant, CloudTask |
| Freelance marketplace | You do everything: vetting, training, management and QA | You need a one-off task, like a lead list or a short calling project | Upwork |
How We Evaluated Each Provider
We looked at the criteria buyers ask us about most often:
- Vetting: Does the provider test candidates on real sales tasks, or only interview them?
- Management and QA: Who checks performance every day, you or the provider?
- Fit with US teams: English fluency, US business norms and overlap with US hours.
- Scope: SDRs only, full-cycle teams, field sales or marketing support.
- Cost against outcomes: Savings only matter if the reps book qualified meetings.
- Flexibility: Contract terms, pilots and how fast you can scale up or down.
Sales Outsourcing Companies Compared
| Provider | Model | Main roles | Best for | Main limitation |
|---|---|---|---|---|
| Remote Growth Partners | Managed placement | SDRs, BDRs, marketers, designers, video editors | Startups and agencies that want dedicated, embedded offshore reps | Remote roles only, no field sales |
| CIENCE | SDR agency | Managed SDR teams with data and automation | High-volume, multi-channel outbound | Reps are not embedded in your team |
| Martal Group | SDR agency | Senior SDRs, fractional teams, appointment setting | Tech companies selling to senior buyers | Premium pricing, top of funnel only |
| Belkins | SDR agency | Personalized email and LinkedIn appointment setting | Companies with no in-house SDRs | Package pricing and minimum commitments |
| SalesHive | SDR agency | US-based SDR campaigns with its own platform | Fast, tech-driven meeting setting | Higher base cost than offshore options |
| Callbox | SDR agency | High-volume calling, email and social campaigns | Phone-heavy lead generation at scale | Standard playbooks, multi-month campaigns |
| MarketStar | SDR agency | Full-cycle teams from SDR to account management | Mid-size and large companies | Needs a larger commitment |
| Sales Partnerships, Inc. | Field sales outsourcing | Field and direct sales teams | Enterprises that need reps on the ground | Mostly US reps, little labor savings |
| HireWithNear | Staffing | Nearshore SDRs, AEs and marketers from Latin America | Teams that will manage reps directly | Latin America only, no daily management |
| GrowthAssistant | Staff augmentation | Offshore marketing and sales support roles | Teams with a playbook that need more hands | You manage daily work, marketing-leaning |
| CloudTask | Talent marketplace | On-demand, pre-vetted SDRs | Short pilots and fast capacity | Quality depends on the individual rep |
| Upwork | Freelance marketplace | Freelancers for any sales task | One-off projects | You own vetting, training and QA |
The Providers in Detail
1. Remote Growth Partners: Managed Offshore SDR Placement
Remote Growth Partners is a US-based firm that recruits, places and manages full-time offshore SDRs and marketing talent. Each hire works only for your company. RGP handles payroll, HR and compliance, and a dedicated account manager oversees performance.
Strengths:
- A 4-stage vetting process for every role: a video screen, a job preview test, a deep interview and a paid real work test. You only meet candidates who passed all four. See how the vetting process works.
- Reps are full-time and exclusive, so they learn your product, ICP and messaging like an in-house hire.
- One partner for sales and marketing roles, including SDRs, marketers, designers and video editors.
Limitations: Remote and inside sales only. Not a fit for field or door-to-door teams. Finding the right hire takes a few weeks, so it is not an overnight temp service.
Best for: Startups and agencies that want dedicated offshore SDRs vetted to in-house standards, without running hiring and oversight themselves.
2. CIENCE: Data-Driven SDR Agency
CIENCE runs fully managed SDR teams that do multi-channel outreach across phone, email and social, supported by its own data and automation tools.
Strengths: Built for volume. Strong research and targeting. Global operations allow campaigns in several regions and languages.
Limitations: The SDRs work for CIENCE, not inside your team. Make sure messaging is tailored to you and does not lean on a standard playbook. Pricing is custom.
Best for: Funded startups and mid-market companies that want a turnkey outbound engine.
3. Martal Group: Senior B2B Lead Generation
Martal Group is a Canada-based firm that provides experienced SDRs and fractional sales teams, mostly for tech and SaaS companies.
Strengths: Senior, multilingual reps who can reach C-suite buyers. Omnichannel campaigns built from a strategic outreach plan you approve.
Limitations: Premium pricing. Focused on lead generation and meeting setting, so your own team still runs demos and closes deals.
Best for: Tech companies with budget that care more about meeting quality than volume.
4. Belkins: Personalized Appointment Setting
Belkins is a US-headquartered outbound agency known for researched, personalized email and LinkedIn outreach. It handles lead lists, messaging, domain warm-up and booking.
Strengths: Starts with ICP research. Hand-built prospect lists. Also offers deliverability and CRM setup help.
Limitations: Tiered packages with minimum commitments. Reps are an external team, so plan time at kickoff to train them on your offer.
Best for: B2B companies without in-house SDRs that want an expert team to run outbound end to end.
5. SalesHive: US-Based SDR Campaigns
SalesHive is a US-based outsourced SDR agency that pairs reps with its own outreach platform and analytics.
Strengths: Tools are included. Month-to-month terms. Fast to launch.
Limitations: Higher base cost than offshore options. Top of funnel only.
Best for: B2B companies that want fast, tech-driven meeting setting from a US team.
6. Callbox: High-Volume Calling Campaigns
Callbox is a long-running lead generation provider based in the Philippines. It runs multi-channel campaigns with a heavy focus on cold calling.
Strengths: Capacity for large call volumes. Its own platform and contact data. Done-for-you copy, lists and optimization.
Limitations: Playbooks can feel standard for niche markets. Campaigns are usually sold in multi-month blocks. Philippine hours mean you plan syncs around the time difference.
Best for: Companies that already have closers and need many more first meetings.
7. MarketStar: Full-Cycle Sales Teams at Scale
MarketStar runs outsourced sales teams for large tech companies, from SDRs through account management and customer success.
Strengths: Can deploy full-cycle teams. Analytics-heavy. Global reach for multilingual sales.
Limitations: Expensive, often requires multi-rep teams, and offers less flexibility for small companies.
Best for: Mid-size and large companies that need turnkey teams at scale.
8. Sales Partnerships, Inc.: Field and Direct Sales
Sales Partnerships, Inc. (SPI) builds and runs field and direct sales teams, mostly with US-based reps.
Strengths: Deep experience with enterprise field programs. Structured training, QA and analytics.
Limitations: Premium pricing and little labor savings. Better for enterprise programs than small teams.
Best for: Enterprises that need reps on the ground, not just SDRs.
9. HireWithNear: Nearshore Staffing in Latin America
HireWithNear recruits SDRs, AEs, marketers and other roles from Latin America. You can hire the candidate directly or keep them on HireWithNear's payroll.
Strengths: Strong time zone overlap with the US. A pre-vetted candidate pool and a short list of finalists. Flexible employment options.
Limitations: A hiring service, not a managed one. Training, coaching and QA are on you. Latin America only.
Best for: US companies with sales management in place that want nearshore reps they run themselves.
10. GrowthAssistant: Offshore Staff Augmentation
GrowthAssistant places offshore assistants in marketing and sales support roles who work full-time on your schedule.
Strengths: Selective hiring. Assistants work inside your tools and meetings. Handles HR and payroll.
Limitations: You direct daily work. Not a managed outbound service, and the roster leans toward marketing roles.
Best for: Teams with a working playbook that need more execution capacity.
11. CloudTask: On-Demand SDR Marketplace
CloudTask connects companies with pre-vetted SDRs and sales agents on flexible terms, with managed options available.
Strengths: Fast to staff. Good for pilots. Several pricing models, including pay per qualified lead.
Limitations: You usually manage the rep. Quality depends on the individual you pick. Little strategic support.
Best for: Teams that need quick, short-term SDR capacity and already have a plan.
12. Upwork: Freelance Marketplace
Upwork is a freelance marketplace where you can hire for almost any sales task, from list building to calling.
Strengths: Huge global pool. Quick to hire. Flexible pricing.
Limitations: You handle vetting, training and QA. Quality varies widely.
Best for: Short-term or one-off sales projects.
15 Questions to Ask Sales Outsourcing Companies Before You Sign
Use these on every shortlisted provider. Ask for proof, not promises. A strong provider answers each one with specifics and documents.
Vetting and Quality Control
- "Walk me through your candidate screening process, step by step." Look for several stages and at least one real work test, such as a mock cold call or a written outreach sequence. An interview alone is not vetting.
- "What share of applicants make it through your full process?" A provider with real standards knows this number and shares it. Vague answers suggest weak screening.
- "How do you assess English fluency and phone skills?" Ask how they test spoken English on a live call, not just a written sample.
- "What is your rep retention like, and how do you measure it?" Ask for their method and their numbers. High turnover means you keep paying for ramp time.
- "How do you control quality after the rep starts?" Look for regular coaching, call reviews, KPI dashboards and a named person who owns performance.
Operational Fit and Flexibility
- "How fast can you scale my team up or down?" Ask for typical timelines and any notice periods.
- "What does ramp look like from day one to full productivity?" Ask for a week-by-week plan with targets. Be wary of anyone promising instant results.
- "What reporting will I get, and how often?" You want live dashboards plus regular written reviews, not one summary a month.
- "How do you work inside our CRM and sales tools?" All activity should log in your CRM so you own the data.
- "Who is my day-to-day contact, and how many accounts do they manage?" Ask for a named account manager and a clear escalation path.
Commercial Terms and Risk
- "What happens if a rep does not work out?" Get the replacement policy in writing, including how fast a new candidate arrives.
- "Can we hire the rep directly later?" Ask about conversion terms and any buyout fee.
- "What is the minimum contract length, and how do we exit?" Look for an initial term long enough to cover ramp, then a short notice period.
- "What are the all-in costs, including fees I might not expect?" Ask what the monthly fee covers and what it does not, such as tool licenses or setup fees.
- "Can you share references from companies like ours?" Ask for clients you can call directly, in your industry and at your size.
Red Flags That Should End the Conversation
- No real work test anywhere in the vetting process.
- They cannot tell you who owns daily performance.
- Activity is tracked outside your CRM, or reports arrive only once a month.
- No written replacement policy.
- Long lock-in contracts with cancellation penalties.
- Pricing that only becomes clear after you sign.
- No references you can call.
How to Run Your Selection
- Define the job. SDRs, full-cycle sales, field reps or list building? Write down your ICP and what a qualified meeting means.
- Pick the model. Decide who should manage the reps day to day, then shortlist providers in that model only.
- Screen on vetting and QA. Use questions 1 to 5 to cut the list to two or three.
- Check fit and terms. Use questions 6 to 15, then call references.
- Run a pilot. Start with two to three months and clear success criteria agreed up front. Track the SDR KPIs that matter from week one.
If you are weighing outsourcing against hiring in-house, our breakdown of the real cost of hiring an SDR in-house vs offshore walks through each line item.
Frequently Asked Questions
What is sales outsourcing?
Sales outsourcing means hiring an outside provider to run part of your sales motion, such as prospecting, appointment setting or pipeline nurturing. You add capacity and process without adding full-time headcount.
When should a company outsource sales?
Outsource when you need to scale faster than you can hire, test a new market, cover more time zones or cut management overhead. It also works well for a pilot that proves the playbook before you build an in-house team.
How do you protect quality when you outsource?
Choose a provider with real work tests in its vetting, named ownership of daily QA, call reviews and reporting inside your CRM. Agree on KPIs up front and review performance every week.
Should I use an agency or a freelancer?
Agencies and managed providers bring process, QA and oversight. Freelancers cost less per hour, but you recruit, train and manage them yourself. If you have no sales manager with spare time, a managed option usually costs less in the end.
What is the difference between an SDR agency and a managed placement?
An SDR agency runs outreach with its own team and reports results to you. A managed placement gives you a dedicated rep who works only for your company, inside your tools and meetings, while the provider handles vetting, payroll and oversight.
