Sidnet

Sidnet is a Polish software development company founded in 2003, based in Poland with a team of 25+ permanent employees and 6 team leaders. Over 21 years, they've completed 300+ projects for clients across Poland, Britain, and the US. They build web applications from scratch, custom CMS/CRM websites, native and hybrid mobile apps for iOS and Android, and offer consulting and audits. The company works almost entirely remote but maintains high discipline across the team. Their longest relationship is with Kujawski, a leading Polish cooking oil manufacturer—an 11-year engagement maintaining the Fooder platform, which serves 170,000 users who have collected 1.5 million recipes.

Services and capabilities

Sidnet organizes its work around three core pillars: web applications, websites, and mobile apps.

For web applications, they design and build systems from scratch or adapt existing software. They handle both backend and frontend development with an emphasis on process, data integrity, performance, and security. They apply recognized UI/UX standards and deliver aesthetically-pleasing interfaces, but note they're equally comfortable working with externally supplied designs. They also assist with specification creation, technology selection, and task planning for clients who need project guidance.

Websites range from simple landing pages and corporate sites to e-commerce platforms and blogs. They provide end-to-end services: graphics design, content structure, launch, and ongoing server maintenance. They emphasize responsiveness, fast loading, and compatibility across browsers. On the Fooder rebuild, for instance, they tackled technological debt by updating Laravel and all dependencies, then added a recipe search function using Elasticsearch and rewrote the content-download mechanism using PhantomJS.

Mobile applications are built for both Android and iOS using native or hybrid technologies. They leverage device capabilities like geolocation and camera access, build supporting APIs and admin apps, and test across devices and simulators. For Fooder's iOS and Android apps, they chose React Native to share codebase across platforms—a decision that saved the client time and money.

Consulting services include analytical work and specifications, implementing tools and processes into existing teams, and quality/efficiency/security audits.

Their technology stack spans PHP, Laravel, MySQL, JavaScript, React, React Native, Backbone.js, Elasticsearch, Apache Solr, Bootstrap, Sass, jQuery, and Perl. More recent R&D projects involve Unreal Engine 5, SciPy, ElevenLabs, Stable Diffusion, and Google Cloud Platform.

Notable work

Fooder (Kujawski brand, 2016–2021) is their flagship portfolio piece. The platform had accumulated technological debt—outdated Laravel and libraries—so Sidnet's first priority was a thorough dependency upgrade. They then improved the content download from source pages, added a recipe search function powered by Elasticsearch, and expanded the existing iOS and Android mobile apps. The platform now serves 170,000 users with 1.5 million saved recipes.

UK2 (a THG company offering hosting and domains) has been a long-term partner since 2012. Sidnet develops and maintains UK2's integrated sales and service management system, handling programming, version implementation, and work coordination. The project runs on JavaScript, Backbone.js, Underscore.js, and Jenkins.

Mali bracia Ubogich (the Little Brothers of the Poor Association, 2016–ongoing) required a complete rebuild. Sidnet implemented online payment support via PayU, which improved fundraising, and continues to maintain frontend and backend. They also supervise landing pages for fundraising campaigns.

Onkobieg (Sarcoma Association charity race, 2017–ongoing) features a responsive registration site where participants can sign up, order kits, and donate. The organizers gained the ability to manage multiple race editions and handle participation requests.

Other completed projects include Feel The Flow (reservation system for winter trips, 2015–2019), Sarcoma Association website rebuild (2015–2016), and Baza Dobrych Praktyk (Good Practice Database, 2017–2020, with user-generated annotations and PDF generation).

How they work

Sidnet operates as a permanent development partner rather than a project-based vendor. They work almost entirely remote but maintain high team discipline and effective processes. All team members are permanent employees who passed rigorous recruitment. They've demonstrated flexibility—they once built a frontend team in two weeks to meet a deadline—and will take on projects outside their primary areas if the client needs it. For established partners, they provide continuous support and gradual improvements; for new engagements, they assist with specifications, architecture, and technology selection before building. Pricing is not published on the website; consulting is required.

Team and credentials

Sidnet employs 25+ permanent staff across 6 team leads. The company was founded in 2003 (21 years in business as of the source date). All team members are full-time employees, not contractors. No certifications (ISO, SOC 2, GDPR compliance) or partner badges (AWS, Google Cloud Partner status) are mentioned in the source material. The team works in Polish and English; proficiency is not specified but given their British and American clients, communication is clearly functional.