Senior Back End Integrations Software Engineer

Summary

Join OpenSpace, a rapidly scaling startup developing cutting-edge software for builders, as a Senior Backend Engineer. This foundational role offers broad impact, contributing to active software development, shaping team culture, establishing processes, and mentoring. You will collaborate with US-based teams to drive product success and long-term platform scalability. The position is a 24-month contractor role under a Polish B2B agreement, fully remote with flexible hours. Compensation is based on monthly invoices, and the contractor is responsible for their own taxes and social security contributions. No employee benefits are provided.

Requirements

• Minimum 5 years of professional software development experience
• Proven experience designing and implementing APIs, especially REST APIs
• Strong programming skills in Java and/or Kotlin
• Proficiency in relational data modeling with PostgreSQL and seamless backend API integration
• Practical experience with cloud computing platforms, preferably AWS
• Excellent written and spoken English communication skills
• Experience working in international, distributed teams, particularly with US-based colleagues

Responsibilities

• Establish effective collaboration with US-based engineering and product teams
• Take ownership of key projects and proactively drive them to completion
• Rapidly learn and integrate with new software APIs
• Communicate clearly in English through both verbal discussions and written documentation
• Develop robust, scalable software with attention to performance, security, privacy, and fault tolerance
• Efficiently debug complex systems and troubleshoot production issues
• Provide accurate estimates, manage priorities, and deliver on deadlines

Preferred Qualifications

• Adaptability to work analytically and manage multiple priorities in a fast-paced, high-growth environment
• A mindset focused on automation and continuous process improvements for scalability
• Proactive identification of issues with independently proposed solutions
• Comfort operating autonomously with minimal supervision across multiple projects
• Growth-oriented, motivated by dynamic learning opportunities
• Strong attention to detail with the ability to process large data volumes quickly and accurately, with thorough self-review of work