Strong Middle Full Stack Developer

We’re looking for a skilled and motivated Full Stack Developer to join our team at Flexum. In this role, you’ll be responsible for building robust, high-quality features for complex SaaS applications—with a strong focus on custom content editing, real-time collaboration, and AI-enhanced workflows. If you thrive in an autonomous, technically challenging environment, take pride in writing clean, efficient code, and enjoy solving meaningful product problems, we’d love to hear from you.

About Flexum

Flexum is a team of experienced engineers specializing in advanced content editing functionality for modern SaaS products. We help clients build structured, collaborative, and deeply integrated editing experiences—often far beyond what off-the-shelf solutions can provide.

Our work includes:

• Custom implementations using Tiptap, CKEditor, and ProseMirror
• Real-time collaboration with Y.js and WebSocket-based infrastructure
• AI-powered editing tools integrated into domain-specific workflows
  

We support clients across industries—from legal tech and compliance documentation to internal wikis and reporting tools—helping them build next-generation editing experiences directly into their products.

Responsibilities

As a Full Stack Developer at Flexum, you will:

• Analyze product and technical requirements and identify areas for improvement
• Design and implement robust, scalable frontend and backend solutions
• Build custom editing components and structured content features
• Collaborate closely with fellow engineers, designers, and clients
• Maintain best coding practices and help evolve internal engineering standards
• Document your work and communicate technical decisions clearly

We value autonomy and leadership. You’ll have the opportunity to take ownership of your work, contribute to architecture decisions, and play a key role in building meaningful features that users rely on.

Requirements

To succeed in this role, you should have:

• 3+ years of web development experience
• Strong knowledge of JavaScript/TypeScript
• Proven expertise in at least one modern front-end framework
• Solid experience with backend development, databases, and API integration
• Familiarity with architectural patterns and clean code principles
• Intermediate or higher level of English for effective communication
• Experience with CKEditor, Tiptap, ProseMirror, or other content editing libraries is a plus

Offer

Despite the work in a team of highly experienced and knowledgeable professionals, you will also get:

• Full-time contract with long-term collaboration
• 100% remote position with flexible working hours
• 24 working days of paid vacation + paid sick leave
• Additional unpaid days off for personal needs
• Compensation for sports, health, and education expenses
• Home office setup bonus
• Free accounting support for private entrepreneurs (in Ukraine)
• A highly skilled and supportive team focused on technical excellence and meaningful product development