Senior Software Engineer

Summary

Join airSlate's pdfFiller team as a Senior Frontend Engineer and contribute to the development of cutting-edge features for millions of users. You will drive the development of complex user-facing features, lead technical design discussions, mentor junior engineers, and collaborate with cross-functional teams. The role requires 4+ years of experience in JavaScript, TypeScript, and React, along with a solid understanding of design patterns and algorithms. You'll ensure code quality through rigorous testing and proactively identify performance bottlenecks. This opportunity offers flexible work arrangements, bonuses and compensation, stock options, and professional growth opportunities.

Requirements

• 4+ years of experience in JavaScript, TypeScript, and React
• Confident working with asynchronous code (Promises, async/await)
• Solid understanding of design patterns and algorithms
• Ability to write and optimize efficient, high-performance code
• Advanced layout skills: responsive, cross-browser, Flexbox, Grid
• Good knowledge of accessibility standards (WCAG, ARIA)
• Experience building scalable, maintainable CSS architecture
• Proficient with Git and common workflows (e.g., Git Flow)
• Basic understanding of frontend security (XSS, CSRF, etc.)
• Experience with CI/CD tools and processes
• Comfortable with modern SDLC (code reviews, planning, documentation)
• Experience with structured technical documentation using common patterns (e.g., ADRs)
• English B1+

Responsibilities

• Drive the development of complex, user-facing features with a focus on scalability, maintainability, and performance
• Lead technical design and architecture discussions, advocating for best practices and innovative solutions
• Mentor and support mid- and junior-level engineers through code reviews, pair programming, and knowledge sharing
• Collaborate closely with cross-functional teams (design, product, backend) to shape and deliver high-impact features
• Ensure code quality through rigorous testing strategies, including unit, integration, and E2E tests
• Proactively identify and address performance bottlenecks, technical debt, and system improvements
• Contribute to strategic planning, roadmap discussions, and long-term engineering initiatives

Preferred Qualifications

Experience with non-scripting languages (Java, Go, C++, etc.)

Benefits

• Flexible work environment — We value the advantages of in-person collaboration and prioritize work from our offices in Wroclaw or Bialystok. However, we also provide flexible work arrangements to accommodate remote or hybrid options and flexible scheduling
• Bonuses and compensation — On top of a competitive base salary, we reward our team members' performance with a quarterly bonus to recognize achievements, time, and effort
• Stock options — At airSlate, our team members are more than employees; they're business partners. We issue stock options that grant ownership in the company, allowing everyone to share in its growth
• Professional growth opportunities — We are committed to ongoing improvement and welcome those passionate about learning. We cover professional development courses, conferences, literature, English classes, and more for each team member
• Health and well-being —We prioritize the health and well-being of our team. This is why we provide a Luxmed subscription, a Multisport card for every team member, access to the office's massage room, free lunches, and healthy in-office snacks to sustain your energy. Also, we provide all our team members with Mental Health Days, dedicated days off recognized globally to encourage people to log off and recharge
• Open communication — We encourage transparent communication from all team members at airSlate. Feel free to share your thoughts, ideas, and concerns with our management team, CEO, any member of our leadership team, or any team lead at any time