Senior Software Engineer

At airSlate, our journey began in Boston, USA, in 2008. What started as a single product with 3,000 customers has grown into an influential tech company with 900+  team members across six offices worldwide. In 2022, airSlate reached a total valuation of $1.25 billion and became a  'Unicorn 🦄'. But even as we scale, team members remain our most valuable asset. That's why we've built a company that excites people about their work.
We develop products that serve over 100 million users with no-code workflow automation, electronic signature, and document management solutions. The company's portfolio of award-winning products, signNow, pdfFiller, DocHub, WorkFlow, Instapage, and US Legal Forms, empower teams to digitally transform the way their organizations run.
About pdfFiller team:
We are a passionate and ambitious team of 120+ people on a mission to succeed with our online PDF creator and editor –  pdfFiller.pdfFiller empowers over 10 million users every month to create and edit PDFs, send them for signing, and securely store documents within a single application. Offering unlimited storage, unlimited templates, and cross-platform integration, pdfFiller is the only PDF editor needed to get your document done.
MyDocs unit is at the heart of pdfFiller, responsible for core functionalities including dashboards, templates, folders, e-signatures, and Link2Fill workflows. Our mission is to enable secure, efficient collaboration between pdfFiller users and external parties, streamlining how documents are created, managed, and shared.We're building the future of document interaction by integrating AI-driven capabilities that enhance usability and speed across workflows.
And now, we're looking for a Senior Frontend Engineer to help shape one of the most critical areas of our product. This is a unique opportunity to work on cutting-edge solutions that drive value for millions of users.
Tech stack: Typescript, React, Webpack, Jest, Playwright, React router, SCSS, CSS modules, GitHub Actions

What you'll be working on:

• 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

What we expect from you:

• 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+

Nice to have:

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

If you're a frontend pro who's ready to ship fast, learn constantly, and push the limits of what great products can be, apply now and meet us ASAP.
What we offer:
— 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 de