Senior Fullstack Software Engineer, Growth

The Company

Payrails is an innovative technology company with a team that has many years of experience in the payment industry and a real-life understanding of the merchants’ needs. We have seen the complexity firsthand and we have learned from all the challenges we've faced. Now we want to help leading technology companies around the world accept payments and build financial services with minimal upfront investments.

Our vision at Payrails is to reimagine payments. We do this by removing heavy reliance on Engineering efforts using composable building blocks that put the control firmly in the hands of our customers. We exist to help our customers become more productive and flexible, impacting directly on their ability to grow.

We are joined in our mission by top-tier investors Andreessen Horowitz, HV Capital, EQT and General Catalyst alongside a great cast of knowledgeable angel investors to enable us to solve the growing complexity of payments.

At Payrails, we are committed to building a team full of the most talented people. Excellence is part of our values and we understand that in order to achieve this, we need to build an environment where skilled people can work openly, collaboratively, and with the utmost trust in one another. We believe people thrive the most when they are fully aware of what the business is trying to achieve, why it is important to the market, and what challenges lie in the way to reaching our goals. In such an environment we believe people can truly excel, grow and enjoy working together. We try hard to be a company where everyone is inspired and feels a sense of responsibility to do the right thing to help us bring our vision to life. Succeeding with us is about finding solutions to the most pressing problems and executing them effectively.

Your Team

Payrails is a true tech company: our Product is designed by engineers for engineers. We believe in quality before delivery: our mission is to provide an outstanding Payment experience with a strong eye on automation, resilience, and scalability. Our engineering culture is focused on 3 main pillars:

• We aim for operational excellence
• We promote open communication and quick feedback
• We share knowledge and learn continuously
  
  

Our tech team offers you the chance to work alongside a group of highly ambitious and knowledgeable Engineers, while being faced with complex problems that affect customers on a global scale.

What You Will Be Doing

• Leading the design, development, and deployment of features that drive user acquisition, engagement, and retention.
• Architecting and implementing A/B tests to optimize product performance and improve conversion rates.
• Collaborating closely with Product, Marketing, and Data Science teams to identify and execute high-impact growth initiatives.
• Building and maintaining scalable, high-performance web applications using modern fullstack technologies.
• Developing and integrating APIs including CMSs
• Implementing analytics and event-tracking systems to monitor user behavior and measure experiment outcomes.
• Enhancing website performance, SEO, and overall user experience through engineering improvements.
• Driving technical best practices, improving system architecture, and mentoring junior developers.
  
  

You'll be great for this role if

• You have 7+ years of experience in fullstack development, preferably in a growth-focused or product-driven environment.
• You’re proficient in JavaScript/TypeScript, and have deep experience with React, Node.js, or similar frameworks.
• You have good backend development skills, including experience with APIs, databases (SQL/NoSQL), and cloud infrastructure (AWS, GCP, or similar).
• You have a solid understanding of A/B testing methodologies and experiment-driven development.
• You’re comfortable optimizing queries, managing APIs, and handling performance issues at scale.
• You have experience integrating third-party APIs, analytics tools, and tracking systems (e.g., Google Analytics, Mixpanel, Segment).
• You’re data-driven and passionate about leveraging engineering solutions to improve key growth metrics.
• You have proven track record of leading solutions end-to-end
• You have exceptional communication skills, with the ability to clearly articulate complex concepts to both technical and non-technical teams.
  
  

Why You should join Payrails

• You can truly create your own path by taking responsibility and implementing your own ideas
• We offer visa and relocation support to you and your family where required
• We offer a hybrid working environment
• You have 27 annual vacation days
• We get together regularly for team lunches and events
• You help us shape the future of payments