Middle Full Stack Engineer

Location: Poland

About air Slate

air Slate is a global SaaS technology company that develops no-code workflow automation, electronic signature, and document management solutions. Our award-winning products - Sign Now, pdf Filler, Doc Hub, alta

Flow, Instapage, and US Legal Forms - serve over hundreds of millions of users and more than one million customers worldwide, helping organizations of every size digitize processes, improve efficiency, and transform how they work.

We're in an exciting phase of growth and transformation, with teammates in more than 20 countries across three continents and main hubs in the United States, Poland, Romania, Ukraine and Philippines.

At air Slate, we're building value for customers and a culture where growth and innovation go hand in hand. We're looking for people eager to shape products, scale a company, and thrive in a fast-moving environment.

About pdf Filler team:

We are a passionate and ambitious team of 120+ people on a mission to succeed with our online PDF creator and editor - pdf Filler.

pdf Filler 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, pdf Filler is the only PDF editor needed to get your document done.

And now, we are looking for a Fullstack Software Developer who is prepared to contribute to the next chapter of our company's growth.

The person will join the Power Charlie team within the MyDocs unit and work on two product tracks: AI assistant development and a document completion workflow that lets users create one document, gather multiple structured responses, and act on the results.

What you'll be working on:

* Driving AI coding agents to deliver product features - writing clear, context-rich tasks that cover architecture, team standards, and acceptance criteria

* Taking full ownership of every feature end-to-end - from clarifying requirements and understanding the problem, through delivery to production, to monitoring edge cases post-release

* Conducting code and documentation reviews to ensure quality, share knowledge, and maintain consistency across the codebase

* Participating in duty rotations - monitoring production systems, responding to incidents, and keeping services available

* Building AI-powered features that improve UX for thousands of users tackling real business challenges

* Growing technically inside a team with a strong engineering culture, clean architecture, and a high bar for delivery

What we expect from you:

* 3+ years of commercial experience as a software developer

* Hands-on experience with agentic development workflows

* Practical commercial experience with Golang, Node.js, or PHP

* Hands-on experience with JavaScript, Type Script, and React

* Solid SQL and experience with relational databases (MySQL, Postgre

SQL, or similar)

* Working knowledge of Docker for application development and deployment

* Practical experience with testing methodologies

* At least basic knowledge of Dev Ops, CI/CD, AWS, and cloud-native solutions

* Ability to write technical documentation using approaches like the C4 model and ADRs

* Strong task decomposition and prioritization skills

* Fluent English, written and spoken

What we offer

Flexible working environment - Our teams operate across the globe. We value in‑person collaboration in our hubs, but we also embrace remote and hybrid working. You can work from one of our offices in the United States, Poland, Romania or Ukraine, or remotely from many countries.

Competitive compensation and stock options - We offer salaries that reflect local market conditions and experience, plus a performance-based bonus system and stock options so you share in the company's growth.

Professional growth and learning - We invest in your development through courses, conferences, and access to learning resources. We encourage career growth and internal mobility, supporting teammates who want to explore new opportunities within air Slate.

Health and well‑being - We provide comprehensive benefits tailored to each country, including health coverage, wellness programmes and access…