Middle Full-Stack Engineer (React+Java)

We’re building a new team focused on SSIO - a product aimed at simplifying and speeding up integration onboarding.

Right now, onboarding can take weeks and involve a lot of manual support. The goal is to turn that into a self-service experience that takes hours instead. You’ll be working on flows that guide users through integrations, help them fix issues, and reduce the need for human intervention.

Tech stack

• Frontend: React
• Backend: Java (21+) or Scala
• APIs: REST
• Cloud: AWS (ECS, S3, API Gateway, Lambda)
• Database: PostgreSQL

What you’ll work on

• Building self-service onboarding flows for integrations
• Creating UI that helps users understand and fix integration issues
• Designing and integrating APIs that support onboarding workflows
• Improving how errors and system feedback are presented to users
• Contributing to both frontend and backend development

What we’re looking for

• At least 4 years of commercial experience
• Solid experience building production UIs with React
• Experience designing and integrating REST APIs
• Backend development experience with Java or Scala
• Working knowledge of PostgreSQL
• Familiarity with AWS core services
• Understanding of testing practices (TDD or similar)
• Strong communication skills - you’ll be building flows that “communicate” with users through the product

Nice to have:

• Exposure to EDI / B2B messaging concepts

Engineering Practices

• Experience working in agile / scrum teams with two-week sprint cadence
• Strong communication skills for async team collaboration – Slack
• Comfort working asynchronously across time zones with distributed teams
• Proficiency with GitHub — branching, pull requests, code review workflows
• Familiarity with cloud-native deployment patterns

AI-Assisted Development

• Strong hands-on experience using Claude AI or GitHub Copilot for software development tasks
• Proven ability to leverage AI for frontend development, backend development, and test authorship
• Experience integrating AI-assisted development workflows into engineering processes
• Familiarity with prompt engineering practices for code generation and review