How to choose a Software Outsourcing Company: A checklist for business in Singapore

According to Modor Intelligence (2026), the global software outsourcing market is expected to grow from USD 564.22 billion in 2025 to USD 618.38 billion in 2026 and reach USD 977.04 billion by 2031, representing a compound annual growth rate (CAGR) of 9.6% between 2026 and 2031. Among all service categories, application development remains the largest segment, accounting for 37.85% of the market. 

The Asia-Pacific region has established itself as the leading outsourcing hub, capturing 31.75% of the global market share in 2025 (Mordor Intelligence, 2026). Vietnam is rising as a new software outsourcing star in this region, driven by a young and highly skilled workforce, competitive labor costs, and supportive government policies (Statista, 2025).  

However, the growing number of software outsourcing companies in Vietnam also makes vendor selection more challenging. Choosing the wrong partner can lead to project delays, budget overruns, and quality issues. This guide provides a practical checklist of the key criteria businesses should consider when evaluating and selecting the right software outsourcing company in Vietnam. 

Key takeaways  

• The software outsourcing market is projected to reach USD 618.38 billion in 2026 and grow at a CAGR of 9.6% from 2026 to 2031, with application development leading the market with a 37.85% share (Mordor Intelligence, 2026).  

• Vietnam is rapidly emerging as a leading software outsourcing hub in Asia-Pacific, driven by its skilled talent, competitive costs, and strategic location. 

• 62% of companies have increased their use of staff augmentation models due to the rapid growth of cloud modernization initiatives and AI adoption (Market Reports, 2025).  

Software outsourcing: Definition, engagement models, and benefits  

What is software outsourcing?  

Software outsourcing is partnering with an external software development company to design, build, test, maintain, or enhance digital products and IT solutions. Instead of relying solely on in-house resources, businesses can leverage experienced development teams with the technical expertise and scalability needed to deliver projects efficiently. 

Many businesses choose software outsourcing as a strategic approach to software development because it offers a range of benefits:  

• Access to skilled talent: Tap into experienced software engineers with expertise across a wide range of technologies and industries. 

• Cost efficiency: Optimize development costs by reducing recruitment, infrastructure, and operational expenses. 

• Fast time-to-market: Accelerate product development with dedicated teams that can quickly scale based on project needs. 

• Flexibility: Easily adjust team size and resources as business priorities evolve. 

Building software in-house vs. Software outsourcing  

Choosing between building an in-house development team and partnering with a software outsourcing provider is an important decision that can significantly impact your project's cost, speed, and long-term success. While both approaches have their own advantages, the right choice depends on your business goals, available resources, and development needs. 

Here is a quick comparison between the two approaches:  

Building an in-house team is often the best choice for organizations whose software is a core business asset. Meanwhile, software outsourcing is ideal for businesses looking to optimize costs, accelerate development, access specialized expertise, and scale engineering capacity quickly. To maximize the value of outsourcing, it is important to choose a technology partner with proven experience in your industry 

Common outsourcing models 

There are several software outsourcing models. Choosing the right engagement approach is essential to ensure efficient collaboration and successful project delivery. 

01. Staff Augmentation  

What is Staff Augmentation? Staff augmentation allows companies to extend their existing teams by hiring external developers or specialists from a software outsourcing company. 62% of companies have increased their use of staff augmentation models due to the rapid growth of cloud modernization initiatives and AI adoption (Market Reports, 2025).  

Staff Augmentation is suitable for companies with an established engineering team that need additional expertise or extra capacity. 

Example: A fintech company in Singapore needs to accelerate the development of its mobile banking application but lacks experienced AI engineers. The company hires two machine learning specialists from a Vietnam-based software outsourcing provider to work alongside its in-house development team. 

02. Dedicated Team  

What is a Dedicated Team? The dedicated team model provides businesses with a fully assembled team of developers and supporting roles who work exclusively on their projects. 

A dedicated team is suitable for long-term projects, product development initiatives, or companies without an in-house engineering team. 

Example: A Singapore-based travel startup plans to build an online booking platform but does not have an internal technology department. It partners with a software company in Vietnam to establish a dedicated team consisting of a project manager, UI/UX designer, developers, and QA engineers. 

03. Project-based  

What is Project-based? Businesses outsource the entire project to a software development company. The vendor is responsible for managing the team, defining the development process, delivering milestones, and ensuring project outcomes. 

Project-based is suitable for projects with clearly defined requirements, timelines, and budgets. 

Example: A Singapore-based healthcare provider outsources the development of a telemedicine platform to a Vietnam-based software company with clearly defined requirements, a fixed budget, and a target launch date 

Choosing between an in-house team, a dedicated team, or project-based outsourcing requires a clear understanding of how different engagement models compare in terms of cost, flexibility, scalability, and management responsibilities. 

Key criteria when choosing the software outsourcing companies 

How to choose a custom software development company depends on many different factors. The following checklist will help you assess potential partners more effectively.  

01. Technical expertise  

Start by evaluating the vendor's core capabilities across programming languages, frameworks, cloud platforms, databases, and emerging technologies such as AI, machine learning, and cloud-native development. Look for relevant certifications and partnerships, such as AWS Certified, Microsoft Solutions Partner, or Google Cloud Partner, as these credentials demonstrate validated technical capabilities. 

A software outsourcing company in Vietnam with experience across multiple tech stacks offers greater flexibility and can better support complex projects that involve diverse technologies. Also, repeated use of the same tech stack across multiple projects often signals deep specialization. 

02. Domain experience  

A software outsourcing company may be highly skilled in coding but still struggle to deliver value if it lacks experience in your industry. Domain expertise enables vendors to understand industry-specific workflows, regulations, user expectations, and common challenges from day one. This reduces onboarding time, minimizes miscommunication, and accelerates development. 

For example, an offshore software development company that has previously built travel platforms will already be familiar with key requirements such as third-party integrations with global distribution systems (GDS), booking engines, payment gateways, dynamic pricing, inventory management, and multilingual user experiences. 

03. Team composition and Scalability  

The success of a software project also depends on having the right team structure and the ability to adapt as project needs evolve. A well-balanced team typically includes Project Managers (PM), business analysts, developers, QA engineers, UI/UX designers, and DevOps specialists, with a suitable mix of senior, mid-level, and junior talent. 

Ask potential vendors about their team distribution. For example: 

• What percentage of your engineers are senior, mid-level, and junior? 

• Who will be assigned to our project? 

• What is the average experience level of the team? 

• Will we have access to dedicated roles such as QA, DevOps, or business analysts? 

More importantly, your outsourcing partner should be able to quickly scale the team up when additional resources are needed and scale down when priorities shift. 

04. Talent quality & Communication skills  

When evaluating a vendor, look beyond the number of engineers and assess the qualifications of the actual team members. Consider their educational background, years of experience, technical certifications, and hands-on expertise with relevant technologies. 

You should also evaluate English proficiency, especially if your team will collaborate closely with offshore developers. Clear communication helps reduce misunderstandings, speed up decision-making, and improve project outcomes. 

05. Pricing Model & Cost Transparency  

Software outsourcing companies in Vietnam typically offer three common engagement models: staff augmentation, dedicated teams, and project-based outsourcing. Each model comes with different pricing structures, levels of flexibility, and management responsibilities. 

More importantly, look for cost transparency. A reliable outsourcing partner should clearly explain what is included in the proposed rate, such as project management, quality assurance, DevOps support, infrastructure costs, and post-launch maintenance. 

06. Working model   

When evaluating a software outsourcing company, assess whether it follows a structured development process and uses established methodologies such as Agile, Scrum, or Kanban. These frameworks enable teams to adapt quickly to changing requirements, prioritize tasks effectively, and deliver value throughout the project lifecycle. 

Equally important is understanding how the vendor communicates progress and manages project visibility. A reliable outsourcing partner should establish clear reporting routines, including daily stand-ups, weekly progress reports, sprint reviews, and regular stakeholder meetings.  

07. Time zone  

Time zone alignment plays a critical role in communication efficiency and project delivery.  Working with a software outsourcing company in a similar time zone enables real-time collaboration, faster decision-making, and quicker issue resolution.  

A time difference of one to two hours is generally considered ideal, as it allows teams to maintain significant overlap during standard working hours. For example, Vietnam (GMT+7) is only one hour behind Singapore (GMT+8), making it easier to schedule meetings, conduct daily stand-ups, and collaborate in real time. 

Larger time differences do not necessarily create obstacles, provided there are sufficient overlapping working hours. With a good handoff process, teams can establish a continuous 24-hour development cycle. However, limited overlap may reduce flexibility when scheduling workshops, sprint reviews, or urgent discussions. 

08. Security and compliance standards  

Security and compliance should be a top priority when selecting a software outsourcing partner, especially if your project involves sensitive customer data, financial information, or healthcare records. 

A reliable offshore software development company should have strict security policies and comply with relevant industry regulations and international standards, including:  

• IP Protection: Clear IP ownership and assignment clauses, specifying that all source code, designs, and deliverables are transferred to your company upon project completion and payment. 

• Data Security: Recognized security certifications such as ISO/IEC 27001 or SOC 2 Type II, as these indicate strong information security practices. 

• Privacy Compliance: Ensure the vendor complies with relevant regulations, such as PDPA Compliance in Singapore  

09. Reputation  

Start by reviewing the company's portfolio and case studies. Look for projects similar to yours in terms of industry, technology stack, or business challenges. Relevant case studies demonstrate the vendor's ability to deliver measurable results in real-world scenarios. 

Industry awards, technology partnerships, and certifications can also indicate strong capabilities and market recognition. However, third-party reviews often provide a more objective perspective. 

Platforms such as Clutch and GoodFirms allow businesses to evaluate software vendors based on verified client feedback.  

10. Post-launch support and long-term partnership  

A reliable partner should offer clear post-launch support services, including bug fixes, system monitoring, technical support, and regular updates. 

You should also assess the vendor's ability to support your business as it grows. Whether you need to add new features, integrate third-party systems, expand into new markets, or scale up the development team, your outsourcing partner should be able to adapt to evolving requirements. 

Singapore businesses should carefully evaluate these factors in relation to their specific goals, budget, and internal resources. More importantly, understanding the cost landscape is essential to maximizing value and ensuring long-term success.  

Red flags in choosing a software development company  

When evaluating a software development partner in Vietnam, watch out for these common warning signs. One or two issues may not be deal-breakers, but multiple red flags often indicate a higher risk. 

01. Unusually low pricing  

If the pricing is significantly lower than the market average, proceed with caution. Extremely low rates may indicate inexperienced engineers, inadequate quality assurance processes, hidden costs, or high employee turnover. Focus on the overall value delivered rather than choosing the cheapest option. 

02. High employee turnover 

Frequent changes in project teams can disrupt workflows, slow down delivery, and lead to knowledge loss. Ask vendors about their employee retention rate, average tenure, and team stability to ensure continuity throughout the project lifecycle. 

03. No clear development process 

A reliable outsourcing partner should have a well-defined delivery process, including project planning, communication routines, reporting structures, quality assurance, and risk management. A lack of transparency around how work is managed often results in missed deadlines and inconsistent quality.  

04. No client references or independent reviews  

Reputable software companies should be able to provide relevant case studies, client testimonials, or independent reviews on platforms such as Clutch. If a vendor cannot share references or has limited third-party feedback, it may be difficult to verify its capabilities and track record. 

05. Unrealistic delivery time  

Be cautious of offshore software development companies that promise exceptionally short delivery times without thoroughly assessing your requirements. It can lead to rushed development, technical debt, compromised quality, and budget overruns. 

FAQs for vendors 

01. How do I monitor team progress to make sure they are working efficiently?  

Clients should clarify how the project is maintained throughout the development process. What tools are used for task tracking, whether progress is updated in real-time and how often updates are shared, and what is included in those reports. 

02. How do you protect client information and ensure data security? 

This includes access control, encryption, and code protection practices. You should confirm whether the vendor signs NDAs and follows any recognized security standards. In addition, clients should ask how personal or sensitive data is handled and what the response process is in case of a security incident. 

03. Source code   

Clients should clarify who will own the source code after the project is completed. It is important to confirm the exact point when ownership is transferred.  

• Who owns the source code?  

• How can I receive the source code? 

• Do you reuse the source code from other projects or share source code from my project?  

04. Payment  

Clients should understand which pricing models are available and which one fits their project best. It is important to clarify the payment schedule, whether it is monthly, milestone-based, or upfront. Clients should ask if there are any additional costs beyond the agreed budget. Another key point is how scope changes or additional requirements will be handled financially. 

05. Maintenance 

Clients should clarify what is included in post-launch support and maintenance: How issues or bugs are reported and tracked after release, the response and resolution times for critical problems, whether maintenance is included in the initial contract or charged separately, and how new feature requests are handled.  

Conclusion  

How to choose a custom software development company is not just about cost or technical skills; it’s about finding a team that aligns with your business goals, delivery expectations, and long-term product vision.  A structured evaluation process helps reduce risks, avoid misalignment, and ensure smoother collaboration throughout the development lifecycle. Instead of focusing on a single criterion, businesses should look at the overall capability, transparency, and reliability of a vendor before making a decision. 

Adamo APAC - Software outsourcing company in Vietnam for Singapore business 

Adamo APAC is the Singapore-based arm of Adamo Software, a Vietnam-founded outsourcing company since 2018. The company delivers tailored solutions designed to address the unique challenges of businesses by combining Singapore-led client engagement with Vietnamese engineering talent.  

What sets Adamo APAC apart?  

• Strong technical expertise: With nearly 40% senior-level and 44% mid-level engineers, Adamo APAC delivers projects quickly with minimal ramp-up time while offering flexible team scaling to match evolving business needs. 

• Deep industry knowledge: Hands-on experience across multiple sectors, with particular expertise in travel and healthcare. 

• Transparent Agile delivery: A structured Agile process, combined with daily stand-ups, weekly updates, and monthly reports, ensures full visibility into project progress.  

• Trusted reputation: Positive client reviews on Clutch, along with industry awards and certifications 

Building your custom software development with Adamo APAC.