Success in business is not just about achieving results, but also about building relationships, fostering trust, and inspiring others to be their best selves.

Having a team spirit as a core value we build a working relationship based on engagement and successful cooperation.

Our diverse minds and extensive domain knowledge allow us to approach challenges from multiple perspectives and create innovative solutions.

We strive to foster a culture of happiness, engagement, and continuous learning, which translates into client satisfaction.

We believe that continuous change is the path to development, and assume that everything is possible if it helps us achieve our sprint goal.

Our team takes on challenges with a growth mindset, embracing new technologies and processes to deliver innovative solutions for our clients.

Our driving force for work is building a good relationship with the client. We transparently communicate project challenges and place great emphasis on code quality.

From the beginning Selleo has been a very easy company to work with, they are easy to communicate with and the whole process of getting set up was simple.

The developers at Selleo are supportive, capable, and adept. They always find solutions to challenges that arise. I am happy with their services and would recommend them for anyone looking for a professional firm.

The developers at Selleo are supportive, capable, and adept. The quality of the work was good in terms of development.

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.

The communication between our teams is excellent. Selleo always clearly communicated with us and we never had any bad surprises. They speak English perfectly.

Collaborative and engaged, Selleo made a marked effort to fully grasp the scope and objectives to achieve the optimal outcomes.

They have good quality code, and we like their approach. Selleo holds themselves to a high standard that I’ve rarely seen in agencies. They only deliver projects that are free of software bugs.

Our teams established a close integration. They quickly became part of our team, which helped us a lot.

Selleo offered insightful and actionable suggestions to enhance the website’s UX and overall quality. Drawing from an extensive knowledge base, the developers programmed clean, high caliber code.

We mostly managed Selleo’s resources internally. They made suggestions and waited for us to instruct them whether or not to instate them. Our communication was very direct.

Selleo offered insightful and actionable suggestions to enhance the website’s UX and overall coding quality. Their involvement in several projects with our onsite team helped reach our timeline goals

Selleo wrote a very good quality of code. Drawing from an extensive knowledge base, the developers programmed clean, high caliber code.

Pleasant, skilled, and accommodating, the team maintained a responsive and open dialogue. They were fully capable of collaborating with our existing team.

I've found an exceptional development partner in Selleo. Thanks to their skill, adaptiveness and integrity, I consider them dear and full members of my team for both backend, web, and React Native development.

Selleo helped us build our digital platform and began the re-write from scratch. They use their good judgment to build something that looks and work well.

They perform well. I’ve never had to push them or make them work faster in any way. I believe they do exactly what I expect them to do, and there are no surprises, which is what we look for in a team.

They have surprised us in terms of code quality or breakages. The team works hard, writing good code and completing all work punctually and to a high standard.

They are very sympathetic to work with. We don’t really think of them as an outside shop as they are part of the daily grind.

We’re really happy to give them free rein to follow their instincts when solving things. I feel like I can trust them as I can my own team, which is important to me.

We've had nothing but good experiences with the team at Selleo, they are dedicated and have meshed really well with the rest of the teams.

Through Selleo’s phenomenal organization and technical skills, all software initiatives demonstrate reliable functionality and promote internal investing success. The team’s responsive leadership, detail-oriented workflow, and transparent structuring continue to impress.

We can talk to them every day, and their leadership is very responsive.

Through Selleo’s phenomenal organization and technical skills, all software initiatives demonstrate reliable functionality and promote internal investing success.

They have an organized and process-oriented approach to problems Their processes smooth out tasks during tight timelines or other issues..

They’re willing to work with us instead of sticking to an adversarial vendor relationship.

The team at Selleo has been positively received internally. Their dedication to the success of the company is noteworthy. They’re skilled and responsive. Customers can anticipate a real partnership while working with them.

Selleo dedication to the success of the company is noteworthy. They’re skilled and responsive. Customers can anticipate a real partnership while working with them.

They’re excited about all of the projects we’re working on. It feels that they brought into what we’re trying to build.

We appreciate how invested Selleo is in our product. Their team strives to be part of our organization by learning our business.

Selleo have allowed us to quickly scale our existing teams with additional developers, often within a couple of weeks. They're a pleasure to work with and have always delivered outstanding quality!

They outperformed any other contractor we’ve worked with, and their communication, dedication, and quality of work is second to none. Without Selleo’s support, the frontend UI would not exist.

As with any agile development process, we identified bugs regularly and prioritized to solve the most significant ones.

We wouldn't have a working frontend without them. The functionality and reliability of their work is solid.

Even though they were a remote contractor, they worked as if they were part of the in-house team.

Northwood Advisors' reputation rides on every solution we deliver. So when I need a development partner, I feel comfortable knowing I've got the Selleo team helping me.

The Selleo team was very efficient, and I recommend them for their attitudes towards understanding user needs and delivering great software.

Selleo has certainly contributed to our recognition as a market leader. They treat this project as if it was their own business. They are emotionally invested in what they’re doing, which, to me, is unique.

Selleo has certainly contributed to our recognition as a market leader by customers and strategic partners.

They are effectively working with us through the entire stack and development process.

Overall, the quality of the code has been consistently high.

Selleo treated this engagement like more than a project and a paycheck. They are emotionally invested in what they’re doing, which, to me, is unique.

Selleo treats this project as if it was their own business, offering great feedback on an almost weekly basis.

Selleo has proved to be a professional and competent web and mobile software development team, they were apt at understanding our wishes and extremely service minded. I highly endorse whole Selleo team.

Selleo’s outstanding price point, ability to meet all deadlines, and willingness to assimilate with the in-house staff created a more efficient workflow.

They really assimilated directly into our process. Through Selleo’s consistent supplementation, the integrated workforce completed tasks faster and with improved accuracy.

We were incredibly satisfied with their work. They delivered to the highest level of quality.

The team at Selleo was fully integrated with our in-house team. We treated them and worked with them just like our own employees.

The team at Selleo have been fantastic to work with. They are highly skilled and knowledgeable programmers and designers who are very conscientious of delivering the best product possible.

Selleo used daily communication to keep the project in check. Their company culture clearly nurtured an energetic and informal working environment.

Before starting the project I had heard stories of some of the challenges of building software, but I’m happy to say the process of building the platform with my team at Selleo has been excellent and very enjoyable

The guys are like family to me. Even as a virtual team, I probably see them more than some of my friends here in Sydney.

What sets Selleo apart is the enthusiasm and care taken on the project beyond scope. The guys are really into the project and I know they really care about it’s success.

We’ve never encountered a language barrier; all interactions and documents are done in English. They’re interested in our feedback, proactively finding ways to improve.

As a central selling point, the product attracts new clients and increases sales. Selleo's suggestions are extremely valuable, making them a cornerstone of our product development.

We collaborate to define the best strategies for our product’s technical architecture, implementation plans, and development processes.

Their developers not only provide basic coding services, but they also participate in code reviews and offer feedback.

Their talented developers don’t see this as just a simple project; it’s clear that they care about our success. This attitude is something money can’t buy, so I appreciate this level of dedication.

Selleo developers have a wide range of interests, extending their knowledge to improve different elements of my busines

Selleo has been a great partner for us since day one. They provide a team of skilled and professional developers that are self going, engaged and well organised. We often recommend Selleo highly to other partners and associates.

Selleo delivered a reliable product that’s still being used today. With Selleo, the entire development process was quite open and lean, they were so well integrated into our team. It was a transparent and productive engagement.

Selleo delivered a reliable product that’s still being used today. Compared to other vendors, the team stands out for their involved collaborative skills and seamless workflow.

With Selleo, the entire development process was quite open and lean. Overall, it was a transparent and productive engagement.

We have worked with Selleo for several years and can highly recommend them as a software partner. Selleo has been a team that has proven they're dedicated to completing innovative projects and offering useful direction for our software.

Selleo has been a team that has proven they're dedicated to completing innovative projects and offering useful direction for our software.

The team works hard, writing good code and completing all work punctually and to a high standard.

They are able to work on their own initiative and take responsibility for their tasks.

They take full ownership of their work and always use the best tools available while maintaining high security and scalability. The entire project is based on mutual trust and openness.

I’ve been quite impressed with Selleo’s work — they built a beautiful product with outstanding code. Selleo’s other strengths include Agile project management, excellent English communication skills, and consistent professionalism.

The majority speaks English well, and they would tell me if I’m speaking too fast or if something isn’t clear. This is valuable for us since communication is key in dealing with different time frames.

I’ve been quite impressed with Selleo’s work — they built a beautiful product with outstanding code.  The app has received a lot of accolades from the industry during conference demos.

For a project of this magnitude, things are going smoothly from a development and management perspective. Selleo’s team is professional, and they follow our timelines.

Selleo takes care of any issues along the way. They want to fix the product and code in order to have the highest-quality product.

With Ruby on Rails expertise and the capacity to perform UX and graphic design together with DevOps, Selleo is the right fit from every angle. Their communicative approach to project expectations fosters mutual trust.

They’re good at communicating and careful when setting expectations.  It’s important to have trust between partners, and they’re open enough for that to cultivate.

Selleo has built some amazing things as of late. This platform is the first of its kind and we have been attracting some giant corporations to partner with.

I rely on them heavily from a project management standpoint.  Selleo works methodically and correctly, rarely making mistakes. They don’t overpromise, in fact, they probably overdeliver—and that’s a good thing.

Selleo doesn’t just code, they understand what they’re coding and what the commercial implications could be.

The people blow me away, they’ve got a fantastic team. Everyone on their team is motivated and we all get on really well. After three years with the team, we still enjoy working together.

It helps to have a team that understands the commerciality behind what we’re trying to do.

We have worked with Selleo's development team for the past three years. They have been consistently diligent and reliable, and they have produced high quality code for us. We have no hesitation in recommending them.

They’re well-versed across the team, and they communicate well and listen to feedback.

They help us maintain our existing large code base and built some standalone new systems that we needed to build for clients.

They’re well-managed as a team and very inclusive. I was impressed by their professionalism.

I was very impressed with the quality of the frontend work they did, their professionalism, and their organization.

Selleo wasn't the cheapest, wasn't the most expensive, but it was by far the best value. They've continued to work with us on different issues, and with the pandemic, they helped us pivot and were extremely flexible.

Selleo came in and rescued the project and saved the day. Then, when the pandemic hit, they helped us pivot and worked with us. We're now in good shape when it seemed like we would never finish the project before.

Selleo treated us like an intelligent partner. Instead of telling us exactly what we wanted to hear while staying vague, they dove into the problem and invested time figuring out how we'd solve it, what the problems were, etc.

Selleo's reliable, flexible approach differentiates them from other partners. Rather than producing a generic project plan, they crafted one that fit our unique needs.

Selleo has been an outstanding technology partner over the full life cycle of one of our key product developments.

Selleo has exceeded our expectations for professional and competent web and mobile software development. They have been helpful in every phase of the development process.

They work seamlessly with our internal team, and are adept at understanding our business, and technology objectives.

We've been working with Selleo for over a year and are very satisfied with our collaboration. The code they delivered almost always lived up to our highest expectations. They've been a very trustworthy partner in our software projects.

Selleo is quite flexible and adapted to our needs whenever necessary They're supportive and always help to find the most cost-effective solution to our problems.

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Metreno AS is a communications and HR consultancy from Norway which operates a cloud-based SaaS platform for psychometric tests and evaluations.


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Selleo has proved to be a team of skilled and professional programmers. It was only Selleo who understood what kind of business we were after. We were impressed by the professionalism the company has with regard to processes. They have done a remarkable job in delivering a great product to us.



The evaluation platform facilitates survey management with advanced reporting. It helps enterprises, consultancies, and test providers to simplify and streamline the process of HR-related data processing. The solution is used by such corporate clients as Adecco, Statoil Fuel & Retail, Hogrefe, Karriereverktøy.


Helping our client reach Fortune 500 companies

trommsdorff + drüner innovation + marketing consultants GmbH is a Berlin-based international consultancy for data-driven innovation in marketing services.


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Their talented developers don’t see this as just a simple project; it’s clear that they care about our success. This attitude is something money can’t buy, so I appreciate this level of dedication. Additionally, their developers have a wide range of interests, extending their knowledge to improve different elements of my business.



The BI software tool allows users to visualize, track and benchmark data from social media and Google Analytics to derive an optimal product strategy. With elegant charts and graphs at their hands, the application users gain valuable insights with which to make well-informed decisions. The social media dashboard works as a centralized analytics panel, revealing key consumer insights and enabling the client to stay ahead of their competition.


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Northpass (formerly SchoolKeep Inc.) is a US-based company which provides a cloud-based LMS used by enterprise clients to manage online courses and optimize their training operations.


Building competitive advantage through online training


Selleo has proved to be a professional and competent web and mobile software development team, they were apt at understanding our wishes and extremely service minded. I highly endorse whole Selleo team.



Northpass - a SaaS learning management platform - enables the creation and distribution of learning content. The system provides digital infrastructure for training operations and supports the delivery of branded training experiences. Leading companies such as Airbnb, Uber and Shopify use Northpass to streamline their human resource development processes.


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I look for 5 key things in a software development partner: great programmers, consistent quality, excellent value, a responsive management team, and a fun experience. Selleo is a solid 5 out of 5 by my standards.

 ###### Quality
## Client satisfaction
surveys reveal the average score for product and service quality in the last two years have been **90.2% and 91.4%** respectively. We keep working to go beyond that.

I’ve asked them to complete projects that are new and they’ve always managed to do it. It’s important to have trust between partners, and they’re open enough for that to cultivate.

 ###### Trust
## More than 75%
of our business comes from **recurrent projects and referrals** made by clients and co-workers. We’d love to make traditional marketing and sales redundant.

Selleo were always professional and surprisingly responsive. I would definitely recommend Selleo, and would not hesitate to work with them again.

 ###### LONG-TERM RELATIONSHIPS
## An engagement
with a client usually lasts **well over 2 years**. An average co-worker stays with us for **almost 4 years**. Our clients and collaborators appreciate long-term relationships.

Selleo treats this project as if it was their own business. They are emotionally invested in what they’re doing, which, to me, is unique.

 ###### STABILITY & DEDICATION
## Over the last 5 years
we have operated with a low voluntary **turnover rate of 4.2%**. We serve our clients with stable dedicated teams with long track records of effective joint collaboration.

I’ve been quite impressed with Selleo’s work — they built a beautiful product with outstanding code.

 ###### EFFICIENCY
## Each client is served
by a consistently **collocated team.** We all work from **one office** to ensure broadband communications, productivity and efficient service delivery.

They provide a team of skilled and professional developers that are self going, engaged and well organised.

 ###### ENGAGEMENT
## You access a solid
talent pool. Since 2012 we have run a **[foundation](https://pl-pl.facebook.com/MiksturaIT/) to grow and select talent** from the best regional technical schools. The community engagement project fuels our **steady organic growth**.

They take a lot of responsibility. We’re really happy to give them free rein to follow their instincts when solving things. I feel like I can trust them as I can my own team.

 ###### OWNERSHIP
## Attitude is King
...in all we do. Clients are served by dedicated people with a sense of ownership, **initiative and a proactive approach ** to problem solving.

What sets Selleo apart is the enthusiasm and care taken on the project beyond scope. The team have been fantastic to work with.

 ###### CARE
## With a team of 50+
we are **small enough to care** intimately while at the same time delivering ample capacity and deep expertise needed.

 ###### INNOVATION
## 9 out of 10
collaborators would recommend Selleo to a friend of theirs. **Strong bonds, participation**, company-wide profit & gain sharing scheme involving everyone with a say may all play a role in the preference.

Engage Ruby on Rails expert
developers from Poland
Design and build great apps

Scale or hire a development team with top developers.
Join 230+ tech leaders who have built their software
with our Ruby on Rails development company.

Tell us about your project

Engage Ruby on Rails expertdevelopers from PolandDesign and build great apps

Scale or hire a development team with top developers.Join 230+ tech leaders who have built their softwarewith our Ruby on Rails development company.

Tell us about your project

Engage Ruby on Rails expert
developers from Poland
Design and build great apps

Scale or hire a development team with top developers.
Join 230+ tech leaders who have built their software
with our Ruby on Rails development company.