Senior Software Engineer/Mathematician

About airSlate

airSlate is a global SaaS technology company that develops no-code workflow automation, electronic signature, and document management solutions. Our award-winning products - SignNow, pdfFiller, DocHub, airSlate WorkFlow, 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 airSlate, 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 the team:

The PPC Development team builds and maintains software that supports pay-per-click (PPC) advertising across Google, Bing, and other major ad platforms. A key focus of the team is optimizing and automating the ad bidding process, including designing smart bidding algorithms and budget allocation optimizers.

In this role, you will design and implement these algorithms end-to-end, tackling large-scale challenges that directly impact company revenue and ad performance, while also contributing innovative ideas to enhance the team's capabilities.

• Design and implement bidding algorithms that optimize CAC, CPA, CTR, and other performance metrics across ad platforms;
• Develop mathematical models for bid optimization, budget allocation and other constraints;
• Collaborate with ML team to prototype and productionize ML models for Ad bidding;
• Continuously monitor and improve algorithm performance through A/B testing and statistical analysis;
• Work with PPC managers and Marketing stakeholders to align business requirements with Ad bidding processes;
• As part of PPC development team, participate in integration with Marketing engine platform and PPC tools development.

• Bachelor's or Master's degree in Computer Science, Applied Mathematics, Statistics, or related field. PhD is a plus;
• Demonstrated multi-year experience as a Software Engineer, with a proven track record of delivering production-grade systems;
• Deep understanding of probability, statistics, optimization, and linear algebra;
• Solid knowledge of object-oriented programming (OOP) principles and software design patterns;
• Strong programming skills in Python;
• Experience with machine learning frameworks and familiarity with reinforcement learning concepts is a plus.

• Experience with Java or PHP is a plus;
• Knowledge of digital advertising, PPC platforms, or programmatic bidding preferred but not strictly required;
• Experience with machine learning frameworks and familiarity with reinforcement learning concepts is a plus.

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 airSlate.

Health and well‑being - We provide comprehensive benefits tailored to each country, including health coverage, wellness programmes and access to fitness options. We also dedicate quarterly company-wide Mental Health Days, when everyone takes time off to rest and recharge.

Family‑friendly culture - Family life is part of who we are, and we embrace it in many forms. From flexibility for parents to our airSlate Junior Club for kids, to company-wide family days and our pet-friendly approach, we're committed to making work and life easier to balance.

Giving back - We support charitable initiatives around the world through the airSlate Care programme. Our current focus includes humanitarian aid in Ukraine and other regions, matching employee donations and supporting causes chosen by our teams.

Open communication - We encourage transparent dialogue at all levels. From team discussions to company-wide Q&A sessions with our CEO, we make sure everyone has the chance to be heard and to influence how we grow.

It is airSlate's policy to comply with all applicable equal employment opportunity laws by making all employment decisions without unlawful regard or consideration of any individual's race, religion, ethnicity, color, sex, sexual orientation, gender identity or expressions, transgender status, sexual and other reproductive health decisions, marital status, age, national origin, genetic information, ancestry, citizenship, physical or mental disability, veteran or family status or any other basis protected by applicable national, federal, state, provincial or local law. airSlate's policy prohibits unlawful discrimination based on any of these impermissible bases, as well as any bases or grounds protected by applicable law in each jurisdiction. If you need assistance or an accommodation during the application process because of a disability, it is available upon request. airSlate is pleased to provide such assistance and no applicant will be penalized as a result of such a request. Pursuant to relevant law, where applicable, airSlate will consider for employment qualified applicants with arrest and conviction records.

Read our Recruitment Privacy Notice to Learn how we process your personal information.