Senior SharePoint Front-end Developer (f/m/x)

About the Position

We are seeking a Senior SharePoint Front-end Developer to join our team and work on innovative solutions for SharePoint Online. In this role, you will be responsible for developing and maintaining the frontend layer of a Knowledge Base using SharePoint Online, collaborating with backend teams and analysts to ensure high-quality and efficient solutions. If you are passionate about creating impactful SharePoint applications, this opportunity may be the right fit for you.

Responsibilities

• Developing and maintaining the frontend layer of a Knowledge Base based on SharePoint Online
• Designing and implementing SPFx and React components
• Integrating with Microsoft 365 services and internal system APIs
• Collaborating with backend teams, analysts, and UX designers
• Ensuring the quality, performance, and usability of the solution

Requirements

• Minimum 5 years of experience in creating SharePoint Online solutions using SPFx, React, and TypeScript
• Very good knowledge of PnP SPFx Controls, PnPJs, Fluent UI, and Microsoft Graph API
• Experience in creating Web Parts, forms, and business components for SharePoint Online
• Experience in integrating applications with REST APIs
• Familiarity with Git and CI/CD processes
• Advanced level of Polish and residence in Poland
• Intermediate level of English

Nice to Have

• Knowledge of TanStack Query, Redux Toolkit, or Zod
• Experience with Power Platform
• Experience in intranet projects, knowledge portals, or SharePoint Online-based solutions

We Offer

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care

About the Company

Since 2015, we have been recognized with the Great Place to Work title every year, a prestigious award based on employees feedback. According to the study, over 92% of people working at Sii consider it a fantastic place to work.

We began as a one-person start-up in 2006 and grew into a 7,500 workers company in 2025, generating revenue of PLN 2.2BN, having no debts, and being recognized as the leading IT services provider in Poland by the Computerworld TOP200 report.

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.