Custom software development means building an application around a specific business process, instead of adapting an off-the-shelf product to fit that process. A business chooses custom development when its workflow, data structure, or integration needs do not match what a generic tool can support. Vietnam hosts a growing number of companies that provide this service, and 10 stand out for 2026 based on service scope, industry focus, and delivery track record.
1. Relia Software
Relia Software is a custom and AI-driven software development company founded in 2011. The company has delivered more than 300 projects across various sectors with a team of over 50 engineers, designers, and QA specialists.
Relia Software builds custom web applications, mobile applications, AI/ML features, and enterprise systems for clients in education, travel, fintech, healthcare, and e-commerce. The company manages the full development cycle, from requirements analysis and architecture design through deployment and ongoing maintenance. Contracts include full intellectual property ownership, a detail businesses should confirm with any custom development partner before signing.
2. FPT Software
No software company in Vietnam employs more people than FPT Software, which has grown from 350 staff in 2003 to more than 28,000 today. Founded in 1998 as part of FPT Corporation, the company now operates in 30 countries, with Japan as its largest market.
Enterprise resource planning projects and large-scale IT migrations recur often in FPT Software’s project history, alongside digital transformation consulting, robotic process automation, and enterprise mobility work. Its scale suits large enterprise clients that need a vendor able to staff sizable, multi-year engagements across several regions at once, something smaller custom development shops typically cannot match.
3. CMC Global
CMC Global operates as a division of CMC Corporation, a company that has run in Vietnam since 1993, though CMC Global itself was established in 2016 and has grown quickly to more than 3,000 certified engineers serving 300-plus clients across 30 countries. Hanoi houses its headquarters.
CMMI Level 5 and ISO 27001 certification frame a formalized, documented approach to custom software development, cloud enablement, data analytics, robotic process automation, and AI services such as computer vision and natural language processing. Businesses that prioritize process documentation over a faster, less structured vendor relationship may find this level of formality worth the tradeoff.
4. Orient Software
A 5.0 rating on Clutch and more than 200 global clients back Orient Software’s reputation, built since its 2005 founding in Ho Chi Minh City into a team of over 400 certified engineers across six delivery centers.
Custom application development, UX/UI design, cloud infrastructure, and legacy modernization projects fill out its service list, with quality assurance and usability treated as core requirements rather than late-stage additions. ISO 27001, ISO 9001, Microsoft, and AWS partner status support that process. Businesses that have been burned by a vendor treating usability as an afterthought may find this emphasis a meaningful differentiator.
5. VTI Group
Four countries host VTI Group’s operations: Vietnam, Japan, Korea, and Singapore, giving the company a genuinely regional footprint since its 2017 founding in Hanoi. More than 1,800 people now work across those offices.
Custom application development, cloud computing, generative AI services, and ERP-CRM implementation using platforms such as SAP and Odoo make up the company’s core work, supported by CMMI Level 3 and ISO/IEC 27001 certification. Businesses expanding a custom system into multiple Asian markets at once may find VTI Group’s existing regional presence more useful than a single-country vendor would be.
6. Luvina Software
Japan has been Luvina Software’s primary market since its 2004 founding in Hanoi, and the company’s process reflects Japanese communication norms throughout a project, not just in client-facing meetings. Branch offices in Da Nang and Ho Chi Minh City support a workforce of more than 750 IT professionals, who have delivered over 1,000 projects for 110-plus clients.
Software development, DevOps, cloud development, and long-term maintenance make up Luvina’s core services, backed by ISO 27001 and CMMI Level 3 certification. Businesses that need a partner already familiar with Japanese client expectations, rather than one learning them on the job, may find this specialization worth the search.
7. KMS Solutions
Banking and financial services make up KMS Solutions’ entire focus, a narrower scope than the generalist development companies elsewhere on this list. Operating as part of the broader KMS group alongside KMS Technology, the company delivers custom banking and fintech software plus enterprise testing services to clients across the Asia-Pacific region.
That sector focus means less breadth outside finance, but more depth within it, an advantage for businesses building regulated financial products that need a vendor already familiar with the compliance requirements involved. Ask for reference clients operating under the same regulatory framework as your own before signing, since sector experience varies even within a specialized vendor.
8. Bestarion
Bestarion launched in 2018, but its roots go back further through parent company Larion, which has operated since 2003. Ho Chi Minh City hosts its main office, with a second location in Austin, Texas.
Custom software development, testing, DevOps, and production support sit alongside business process outsourcing services like accounting and data processing, an unusual combination backed by ISO 27001, ISO 9001, and CMMI Level 3 certification. Businesses that want development and back-office outsourcing from a single vendor may value that combination, though it is worth confirming exactly which service lines apply to a specific engagement before signing.
9. Rikkeisoft
AI development has become a growing part of Rikkeisoft’s business, added onto a foundation of standard web and mobile work built since the company’s 2012 founding in Hanoi. More than 2,000 employees have delivered upward of 1,000 projects for 500-plus clients, under ISO 9001 and ISO 27001 certification.
Generative AI and computer vision projects, in particular, get layered onto existing custom systems rather than built as standalone new products, which suits businesses that already have a system in production and want to extend it with AI features. Confirm how recent and how similar in scope Rikkeisoft’s past AI work is before relying on that experience for your own project.
10. TMA Solutions
Few custom software vendors in Vietnam can match TMA Solutions’ history, dating back to 1997 and now spanning more than 4,000 employees across offices in Canada, the United States, Australia, Singapore, Japan, and Germany, alongside its Ho Chi Minh City headquarters.
Telecom, finance, and healthcare systems make up a significant share of its custom development work, and the company runs application maintenance and quality assurance as separate service lines rather than folding them into the build contract. CMMI Level 5 and ISO/IEC 27001 certification back that process. Businesses that want one vendor spanning build, maintenance, and support long after launch may value this combination of scale and process history.
Conclusion
Confirm that a company has delivered a project similar in scope and industry to what you plan to build, and ask for references from that specific type of project. Request a clear breakdown of the development process, including how the company handles requirements changes mid-project, since that is where many custom software projects run over budget.
The companies listed here represent different strengths, from FPT Software’s scale to Relia Software’s fintech and healthcare project experience, so the right choice depends on matching a company’s specific track record to your project’s requirements rather than picking the largest or best-known name on the list.