Backend Developer

Notes:

• This job opportunity is open only to residents of Poland.
• At Supono Holdings LTD, we use tools such as ActivTrak to ensure code security, safety, and traceability. By applying, you confirm your comfort with this policy.

Were looking for a Backend Developer to join Supono Holdings LTD and help us build fast, reliable, and scalable backend systems. This role is ideal for someone who can work independently, take ownership, and move quickly from idea to production.

Employee-Owned Structure & Revenue Sharing

At Supono Holdings LTD, we operate under an employee-ownership model, meaning every team member benefits directly from the companys success. In addition to a competitive fixed salary, all employees participate in our revenue-sharing program, ensuring contributions are rewarded fairly and transparently.

What Youll Work With

• Node.js / Express
• RESTful APIs
• MongoDB & MySQL
• Docker
• API integrations (third-party services, AI tools, etc.)
• Firebase Firestore

Experience integrating AI APIs (e.g. LLMs, Hugging Face, or similar) is a strong plus.

What Were Looking For

• 4+ years of backend development experience
• Strong experience designing and building RESTful APIs
• Solid knowledge of Dockerized environments
• Hands-on experience with MongoDB and MySQL
• Ability to create dummy / mock APIs to unblock frontend development when needed
• Comfortable working with incomplete specifications and moving forward pragmatically
• Strong ownership mindset with the ability to self-manage

How We Work

• Projects move fast often from scratch to launch within 27 days
• You may be asked to start backend architecture before final Figma designs are ready
• A typical request might be: Build something similar to this competitor
• We value engineers who can translate ambiguity into execution

What We Offer

• Competitive fixed salary
• Employee-owned structure & revenue sharing
• Direct participation in the companys success
• High ownership, low bureaucracy
• A team that values execution, clarity, and accountability

Nice to Have

• Experience integrating AI / ML APIs
• Familiarity with scalable backend architectures
• Experience working in fast-paced product teams