Omnichannel Digital Marketing
A link building agency earns backlinks to your site from relevant third-party websites. It runs prospecting, outreach, linkable assets, and reporting, so your team does not build those workflows itself. An SEO agency covers the whole site, and link building is one of its workstreams.
This guide reviews five link building agencies operating in or serving the Vietnam market. The comparison focuses on their link building services, broader SEO capabilities, approach to authority building, available evidence, and pricing transparency. The agencies are presented in alphabetical order rather than ranked, so readers can assess each option based on their own website, target market, and campaign requirements.
Key takeaways
- A link building agency earns and places backlinks. An SEO agency covers the full site, and link building is 1 of its workstreams.
- 3 pricing models exist: per-link, monthly retainer, and project fee. These are vendor prices, not a market average.
- Google’s spam policies classify buying or selling links for ranking purposes as link spam, unless the links carry rel=”nofollow” or rel=”sponsored.”
- Judge an agency by live example placements, relevance of linking sites, and reporting, not by a domain rating alone.
- A Vietnam-based link building agency suits you if you need Vietnamese-language sites or a local team, alongside English placements.
Link building agency: definition and scope
Link building is the process of establishing relevant hyperlinks (usually called links) to a website from external sites. Link building can increase the number of high-quality links pointing to a website, in turn increasing the likelihood of the website ranking highly in search engine results. A link building agency helps earn links by giving editors a reason to link. The work falls into 3 workstreams.
Outreach and relationship-based placements
The link building agency builds a prospect list of sites that cover your topic, pitches a named editor, and secures a link inside content that the editor already wants to publish. A placement looks like a citation of your page inside a relevant article, with a descriptive anchor. Repeat pitches to the same editors build the relationships that make later placements faster.
Example workflow (illustrative). A SaaS company publishes a benchmark page on API uptime. The link building agency lists the trade sites and newsletters that cover API reliability and pitches each editor with the 2 headline findings. An editor who cites the benchmark in a related article creates the placement. The agency logs the live URL, anchor text, and link type. See our content marketing work for the asset side of this process.
Digital PR and linkable assets
Data studies, free tools, and original research can earn links because writers cite the original source. The link building agency picks the asset and pitches the story to the press.
Stack Overflow’s Annual Developer Survey shows the format: the 2025 edition published results and downloadable data from 49,000+ responses in 177 countries on its own results page (Stack Overflow, 2025). Writers cite it because it is the primary source for those numbers.
Partnerships and contributed content
Guest articles, integrations, and partner directory listings create links through a business relationship.
Disclosure rules apply. Google treats payment for articles that carry links passing ranking credit as link spam and allows paid or sponsored links that use rel=”sponsored” or rel=”nofollow” (Google spam policies).
Google also recommends tagging sponsored and guest post links, and says excessive untagged ones can draw algorithmic or manual action (Google Search Central, 2021).
Link building agency vs SEO agency, freelancer, and in-house team
Each option covers a different slice of the work. The table below compares them on cost structure, capacity, reporting, and risk. It carries no figures because we hold no sourced price data.
Compared with a full-service SEO agency
A full-service SEO agency covers technical fixes, content, and links. If your site has crawl or content gaps, fix those first, because a link to a page Google cannot index has no page to lift. A link building agency suits a site whose on-page work is done and whose bottleneck is referring domains.
Compared with a freelancer
A freelancer fits a narrow job, such as pitching 1 asset to a known list of editors. One person caps capacity and creates continuity risk. Ask for a sample report and 3 live placements, as you would with any vendor.
Compared with an in-house hire
An in-house hire gives you control and product knowledge. You also carry salary, tool costs and the time to build editor relationships from zero. It suits teams that expect link work as a long-term, continuous need.
Real Estate Marketing Agency vs in-house
| Criteria | Link building agency | Full-service SEO agency | Freelancer | In-house hire |
|---|---|---|---|---|
| Cost structure | Per link, retainer or project fee | Retainer or project fee across technical, content and links | Hourly, per link or per project | Salary, tools and outreach costs |
| Capacity | A team runs prospecting, assets and outreach in parallel | Link work shares capacity with other workstreams | 1 person’s hours | 1 hire, or a small team you build |
| Reporting | Live URL, anchor text, link type, target-page effect | Site-wide reports; link detail varies | Varies by person; ask for a sample | Internal, in your format |
| Risk | Methods vary; ask how each link is obtained | Link work may be outsourced; ask who does it | Continuity depends on 1 person | Ramp-up time; relationships sit with 1 employee |
The 5-step link building agency process
The order matters, because each step feeds the next.
1. Backlink audit
Input: your backlink export and Search Console data.
Action: review current referring domains, lost links, and toxic patterns.
Output: a baseline, a list of lost links to recover and a list of patterns to avoid.
2. Target definition
Input: the audit and your revenue priorities.
Action: Choose the pages that need links and the sites worth pursuing.
Output: a target-page list with a prospect list for each page.
3. Asset selection
Input: target pages plus your data and expertise.
Action: Decide which content or data earns links for each target page.
Output: 1 asset brief per page, such as a data study, tool, or expert piece.
4. Outreach and placement
Input: the asset and the prospect list.
Action: pitch, negotiate, and secure the link.
Output: live placements, with paid ones tagged rel=”sponsored”.
5. Reporting
Input: the live placements.
Action: list live URLs, anchor text, link type, and effect on target-page rankings.
Output: a report you can verify by opening each URL.
Pricing models for a link building agency
Agencies price in 3 ways, and rates vary by scope and link quality. Public Vietnam-focused examples are useful as reference points, but they should not be treated as a market-wide benchmark.
Per-link pricing
- What it buys: 1 placement per fee.
- Who it suits: a few priority pages or a test before a longer contract.
- Main risk: the fee rewards volume, and a purchased link that passes ranking credit falls under Google’s link spam policy.
Monthly retainer
- What it buys: ongoing capacity for prospecting, assets, outreach, and reporting.
- Who it suits: sites with a continuous link need.
- Main risk: lock-in terms and activity reports that never tie back to target-page results. Ask for exit terms before signing.
Project-based fee
- What it buys: a defined deliverable, such as 1 data study campaign or a backlink audit with a recovery plan.
- Who it suits: a launch, a migration, or a one-off asset.
- Main risk: results stop when the project ends, and a vague scope invites disputes. Write down what counts as done.
Risks and red flags when hiring a link building agency
Paid links and private blog networks
Google’s spam policies name buying or selling links for ranking purposes as link spam. That includes exchanging money for links or for posts that contain links, and using automated programs to create links.
Paid links are allowed when they are tagged rel=”nofollow” or rel=”sponsored”. Sites that violate the policies may rank lower or drop out of results.
A private blog network is a set of sites built to pass ranking credit to a client. In our reading, it matches the policy line on low-value content created mainly to manipulate linking signals.
Google also states that you are responsible for the actions of companies you hire (Google Search Central). Ask the agency how it obtains each link and which attribute the link carries.
Guaranteed rankings or link counts
No link building agency controls rankings. Google’s guidance on hiring an SEO says no one can guarantee a #1 ranking and warns against anyone who claims a special relationship with Google.
Treat a ranking guarantee as a screening failure. For a link count guarantee, ask what quality standard each counted link must meet.
Domain rating as the only metric
Domain rating and similar scores are vendor data from third-party SEO tools. Google says it does not evaluate or endorse those tools and that they have no access to its internal ranking data. We weight the relevance and traffic of the linking page above the score of its domain.
When a Vietnam-based link building agency fits
Google’s hiring guidance suggests asking an SEO about experience in your country and in your industry (Google Search Central). A Vietnam-based team fits in 4 situations:
- Vietnamese-language publications. Vietnam has an established online press ecosystem, including Vietnamese-language electronic publications operated by the Vietnam News Agency. A Vietnam-based team can therefore be useful when outreach depends on Vietnamese-language editorial context and local publication knowledge.
- Local media relationships. This is a capability to verify rather than assume. Ask for named Vietnamese publications and live URLs from recent campaigns. In our own PR work, SotaVision reached 800K+ viewers on a national TV program. That is earned media, not a link result.
- Time zone overlap. Vietnam is on UTC+7 year-round, so the team shares working hours with APAC teams.
- English placements run from Vietnam. A Vietnam team can pitch English-language sites too. Ask for live URLs that prove it.
5 link building agencies in Vietnam
Disclosure: SotaMedia publishes this list and is one of the agencies in it. Agencies appear in alphabetical order, not by rank. We compared them on the same 5 criteria: scope of link building services, named client work with published results, reporting transparency, market focus, and pricing model disclosed.
1. SotaMedia
Website: sota.media
SotaMedia is a tech marketing agency in Vietnam and the marketing arm of SotaTek, an IT engineering company. Our services cover omnichannel digital marketing (SEO, GEO, PPC, content, email, social), PR, branding, and AI marketing automation. Link building is a part of our SEO services, next to technical SEO, content SEO, local SEO, AEO/GEO and SEO audits. Content marketing and digital PR sit in the same service system.
Best for: Tech companies and SaaS teams that need SEO and link building alongside content and growth execution.
2. GTV SEO
Website: gtvseo.com
GTV SEO runs full-service SEO with a separate Authority Building workstream. That workstream covers contextual links, guest posts, niche edits, PR and brand mentions. SEO audit, content, and technical work sit alongside it. GTV also publishes link-building KPIs for total links, authoritative sites, and relevant sites.
Best for: Businesses that want full-service SEO with a defined authority-building and link-building workstream.
3. Saigon Digital
Website: saigon.digital
Saigon Digital offers SEO audits, technical SEO, content, local SEO, and backlink building. Its 2025 SEO strategy guide describes link acquisition through guest blogging, local directories, industry bodies, shareable content, and PR.
Best for: Vietnam-focused or international businesses that need local SEO plus technical and content execution.
4. SEOTOP
Website: seotop.vn
SEOTOP sells backlink packages, entity backlink and social packages, on-page SEO, content, keyword SEO, and full-service SEO. Its backlink page publishes package prices in VND, with deliverables such as backlink quantities, placement coverage, and implementation windows.
Best for: SMEs and service businesses that want packaged backlink work or full-service SEO.
5. TOS (TopOnSeek)
Website: toponseek.com
TOS offers full-service SEO, on-page and technical SEO, content, and link building work and positions the program for SEO, GEO, and AI search. It publishes a link building service guide and SEO case studies. Its ZaloPay case study states the campaign included natural backlinks from strategic partner sites and relevant news sites, alongside other SEO work.
Best for: Companies that want link building inside a broader SEO, GEO, and AI search program.
How to choose a link building agency in Vietnam
Each item below can be tested in a sales call.
- Ask for 3 live placements from the last 6 months and open each URL.
- Check that the linking sites are relevant to your industry and have real traffic.
- Confirm how the agency discloses paid or sponsored placements.
- Request a sample report before signing.
- Ask who does the outreach and who owns the relationships.
- Read the contract for lock-in terms and result guarantees.
Conclusion
A link building agency earns backlinks through outreach, digital PR assets and partnerships, and reports each live link. Before signing, ask for 3 live placements from the last 6 months, then check site relevance, reporting detail, and how paid links are tagged.
If you need help turning those checks into a repeatable link building process, SotaMedia is one option to consider, with experience connecting content, PR, SEO, and the technical work behind organic growth.
Frequently asked questions
A link-building agency earns backlinks to your site from relevant third-party websites. It runs prospecting, outreach, content, or digital PR assets, and reports each live link.
An SEO agency covers technical, content, and link work across your site. A link-building agency focuses on backlinks. Many SEO agencies offer link building as 1 service.
It is safe if the agency earns links through editorial placements and tags paid ones. Google's spam policies treat buying links for ranking purposes as link spam unless they carry rel="nofollow" or rel="sponsored". Ask how each link is obtained.
No agency can guarantee a timeline. Results depend on the site's starting point, competition, target pages, and the type of links earned. Google does not publish a universal link-building timeline, so use a campaign-specific baseline and track referring domains, target-page rankings, organic traffic, and referral traffic over time.
Agencies price per link, by monthly retainer, or by project. Publicly listed Vietnam-focused examples include $10 per contextual/link-insertion backlink and a $100 guest-post outreach service fee, but these are vendor prices for different products rather than a market-wide rate range.
Ask for 3 live placements, check the relevance of the linking sites, request a sample report, and read the contract for guarantees. The 6-item checklist above covers each step.
Yes, if you also need Vietnamese-language publications or a team in your time zone. Confirm the agency can show English placements with live URLs before you sign.
Track referring domains, relevance of linking pages, organic traffic and rankings on the target pages, and referral traffic. Domain rating alone does not show the effect on your pages.
