Job description

For our US client we’re looking for a Senior Java Developer with any Golang experience to help evolve large-scale, real-time, event-driven systems. You'll contribute to new features, production improvements, and ensure high reliability and performance.  Join a team building mission-critical APIs used by Airbnb, WhatsApp, Snapchat, and other global brands.

You'll work alongside experienced engineers passionate about high-quality, fault-tolerant systems powering real-time communication worldwide.

What you will do

• Create scalable microservices that will help support our impressive growth

• Propose scalable, maintainable and cost effective solutions

• Estimate the effort required to develop and deliver new product features

• Implement and execute effective testing strategies, including unit tests, integration tests, and end-to-end tests, to ensure software quality and reliability

• Design and develop approaches to measure, evaluate and improve service quality

• Participate in code reviews, provide constructive feedback to peers, and actively contribute to maintaining a high standard of code quality and development practices

• Contribute to the documentation of the components, design patterns, and the design system to facilitate knowledge sharing and onboarding of new team members

• Stay up-to-date with industry trends, best practices, and emerging frontend technologies, and share knowledge and expertise with the development team to continuously improve our development processes and standards

Required skills

• Excellent software engineering skills in Java (Spring / Spring Boot / Kotlin) - minimum 5 years

• Any recent Go backend experience

• Work closely with cross-functional teams such as Engineering, Operations, and Product Management to ensure seamless integration of new features and services with a focus on reliability, scalability, and performance

• Effective communication skills, both verbal and written, with the ability to collaborate with multidisciplinary teams and articulate complex technical concepts to non-technical stakeholders.

• A strong focus on testing

• An understanding of Object Oriented Design and standard design patterns

• Strong experience of multi-threaded, 3-tier architectures, web services, caching, and dealing with event-driven pipelines

• Willingness to learn and use different technologies/programming languages

• First hand knowledge of Continuous Deployment tools and methodologies

• Experience working with public cloud. AWS would be advantageous

• Experience with SQL and NoSQL databases

• Practical experience of deploying code in a modern programming environment using tools such as Docker, Helm and Kubernetes

What we offer

• 100% remote work with flexible hours in Polish time zone

• Direct contract with a US company – stable, long-term cooperation

• Competitive B2B rates (up to 160 PLN/h)

• Work on mission-critical systems with real impact

• Polish public holidays respected

• Recruitment process: 1–2 technical interviews with senior engineers from the team.