Senior Fullstack Developer

At Squaretalk we're looking for a Senior Fullstack Developer to join our Sofia-based Engineering team and take an active role in shaping our SaaS platform.

You’ll work across the stack — from modern frontends to scalable backend services — helping us deliver world-class features to thousands of users worldwide.

As a senior engineer, you’ll influence architectural decisions, mentor team members, and collaborate closely with Product, UX, and fellow engineers — all within an agile Scrum framework.

What You’ll Do

• Design and develop end-to-end features — from responsive UIs to robust APIs.
• Build high-quality frontends with React, Redux, and TypeScript.
• Develop and maintain scalable backend services using Node.js, Laravel (PHP), and Python.
• Optimize database interactions across PostgreSQL, MySQL, Redis, and MongoDB.
• Work within a hybrid architecture leveraging DigitalOcean and AWS cloud platforms.
• Participate in Scrum ceremonies and collaborate in an agile, iterative development process.
• Maintain and improve our CI/CD pipelines, and contribute to server, deployment, and DevOps tasks.
• Participate in code reviews, architecture discussions, and tech roadmap planning.
• Mentor junior and mid-level engineers, fostering a culture of learning and excellence.
• Collaborate cross-functionally with Product, Design, and DevOps to deliver high-impact solutions.
  
  

• 5+ years experience as a Fullstack Developer.
• Proficiency in React, Redux, TypeScript, and solid understanding of modern frontend architecture.
• Strong backend experience in Node.js and at least one of: Laravel (PHP) or Python.
• Deep understanding of relational and non-relational databases: PostgreSQL, MySQL, Redis, MongoDB.
• Familiarity with cloud platforms — DigitalOcean and/or AWS.
• Experience with CI/CD pipelines, Docker, and server / deployment / DevOps tasks.
• Experience working in an Agile Scrum team.
• Solid grasp of unit, integration, and end-to-end testing.
• Strong understanding of scalable and performant software architecture.
  
  

• Experience with React Native.
• Familiarity with Asterisk and VoIP / telephony systems.
• Experience with scalable event-driven architectures.
• Background in building SaaS products or communication platforms (VoIP, WebRTC, SIP).
  
  

• Ownership mindset — you take initiative and drive features end-to-end.
• Strong team spirit — collaborative, helpful, and open to feedback.
• Excellent communication skills and cross-team collaboration.
• Passion for mentoring and helping others grow.
• Comfortable working in a fast-paced, agile environment.
• Eagerness to learn and stay updated on the latest technologies.
  
  

• Flexible hybrid working model, enabling you to balance work and personal life
• Exciting opportunity to join a successful company, with big ambitions for the future