Custom Software
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Custom Software Development Services

Transform and grow your business. Join over 230 technology leaders who have created applications using our company specializing in custom software development projects.

Custom Software Solution

Engage product design and development experts and reach your business goals

C-executives and business owners from small and medium enterprises collaborate with our dedicated product teams to outperform their competitors and generate business value. Our friendly and trustful relationships with clients enable us to offer our advice and build unique custom solutions.
Engage product **design and development experts** and reach your **business goals**
Delivered projects
Years of experience
Certificates & awards

Client Value & Trust

Learn how entrepreneurs, business and technology leaders who are after software driven innovation are collaborating with our high-performing teams.

Matthew O’Neill
Matthew O’Neill
CEO & Co-Founder, Samewave UK

Selleo has proven to be one of the best outsource development partners we've ever used. They are reliable, communicative, always helpful, consistently deliver to a high standard and are an absolute pleasure to work with too.

Leverage our **domain expertise** and **technical knowledge** to build a one-of-a-kind custom solution
Trust our experience

Leverage our domain expertise and technical knowledge to build a one-of-a-kind custom solution

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How we start collaboration


Signing the

Firstly we sign the non-disclosure agreement to protect your confidential business information.


Call with a Technical Team Lead and a BA

the next step is to schedule a meeting, that will help us with getting a better understanding of your business idea and gathering all the details allowing us to prepare the cost estimation.


Interviews with the whole Team

this is the opportunity for you to get familiar with members of the team that will deliver your product, so there are no unnecessary surprises.



when everything is settled, the team is ready to smoothly start working on the agreed date.

We serve business and tech leaders building custom software

With custom application development expertise in UX Design, Front-end and Back-end implementations our developers and designers can help you execute quickly and ship products faster. We specialize in designing, building, and maintaining distributed multi-tenant, secure, and robust custom software solutions.

Cost-effective development

We all speak English and advocate one team one room rule. Our accessibility and strategic feedback ensure broadband communications, productivity and efficient delivery.

Cross-functional agile team

We work in Scrum and have a sense of ownership. Designers and developers care about clients showing initiative and a proactive approach to problem-solving.

Technology expertise

Leverage the up-to-dateness of our technical skills, high-quality coding practices and expertise in making architectural decisions related to app development.

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Our experience, your success

We take pride in our commitment to quality and excellence and our high Clutch rating is a reflection of that. We always strive to exceed expectations and deliver exceptional results to every client we serve.

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our team

Hire experienced software development team today!

Product Owners and CTOs in start-ups and SMEs craft their SaaS products or build their own cloud-based solutions with our teams.

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Our Expertise

How we helped clients grow their businesses


From an MVP to a successful e-learning platform

Defined Learning contacted us to develop the MVP version of the Defined Careers app in Ruby on Rails. The whole code-base was built from scratch which later was integrated with Defined other existing systems. Our UX/UI team was also responsible for the designs later.View project
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  1. Outdated manual processes: If manual processes are slowing down your organization, custom software can modernize and streamline them.
  2. Integration challenges: If current systems can't effectively communicate or share data, custom software can be developed to integrate them.
  3. Unique business requirements: If your organization has specific needs that can't be met by existing software, custom software can be designed to meet those needs.
  4. Scalability limitations: If your organization is expanding and existing systems can't keep up, custom software can be designed to grow with your business.
  5. Security risks: If sensitive data is being handled, custom software can be developed with stronger security measures to protect that data.
  6. Competitive advantage: Custom software development company can give your organization a unique advantage by providing a customized solution that meets your specific needs.
Different custom software development firms have varying pricing models, often charging by the hour for software development services. However, cost depends on project complexity and other factors. It's important to clearly communicate project requirements and goals before asking for cost estimates, but remember that a lower price may not always result in a better solution, especially in the software development process.

As a software development firm, we can deliver our services in two different ways:

  1. Dedicated team: a method in software development services where a company is contracted to deliver a specific, well-defined product or set of products within a specified timeframe and budget. The focus is on providing the project goals, rather than ongoing support or maintenance.
  2. Staff augmentation: in software development, works by adding external software developers to a company's existing in-house development team. The external developers are integrated into the team and work alongside the in-house developers to complete the software project.

Selleo advocates following the rules and principles of Agile and Lean software development methodologies as the best approach to managing projects. We use Scrum as a lightweight agile process framework to manage our software development as it ensures an appropriate level of communication and collaboration with the client people. We perceive it to be a critical success factor in the execution of outsourced projects. The methodology many times proved to greatly help to integrate all the team members involved in the case of both independent and augmented development teams.

Scrum business processes
The cost of custom software development services can vary significantly depending on several factors. Firstly, the complexity of the software plays a crucial role in determining the cost. More complex software with advanced features and functionality will generally be more expensive to develop. Secondly, the size and experience of the development team can impact the cost. Hiring a large team or a highly skilled team of developers may result in higher costs.

Our custom software development process involves several key stages:

Requirements analysis: We engage in conversations with you to precisely understand your needs and business goals.
Designing: We create a software design and prototype that takes into account your requirements.
Programming: Our team of programmers begins the process of software development.
Testing: We thoroughly test the software to ensure it functions correctly and meets all requirements.
Deployment and support: We assist in the software deployment process and provide technical support after deployment.

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Awards & Certificates

reviewed on
30 reviews
  • Top 1000 Companies Global 2021
  • Top Development Company Poland 2021
HR dream team
  • 2020 HR Dream Team Award
  • 2016 Employer Branding Featured
  • 2015 HR Dream Team Award
ISO CertificateISO CertificateAWS Certificate
  • Information Security Management System compliant with PN-EN ISO/IEC 27001
  • Business Continuity Management compliant with ISO 22301
  • AWS Certified Solutions Architect - Associate