Senior Software Engineer, Software Engineering

Senior Software Engineer

Department: Software Engineering

Employment Type: Full Time

Location: Poland

Zencargo is looking for a Senior Software Engineer to join our core feature squad, working with Kotlin and Spring Boot to build and scale critical capabilities across our digital freight forwarding platform.

As a Senior Software Engineer in this team, you’ll be responsible for delivering high-impact features that sit at the heart of our customer experience, from booking and tracking shipments to streamlining operations for supply chain teams. You’ll contribute to designing and building robust, scalable services with a focus on quality, performance, and maintainability.

This is a hands-on role where you’ll own complex technical decisions, lead by example in code and design discussions, and support your teammates through mentorship and collaboration. You’ll work closely with Product, Design, and other Engineering squads to ensure we re building the right solutions in the right way, always keeping the needs of our users front and center.

• Lead the design, implementation and delivery of complex projects and features aligned with team and company goals.
• Write high-quality, maintainable and well-documented code, setting a standard for others on the team.
• Identify and drive improvements to technical systems, processes and team practices to enhance performance and quality.
• Facilitate technical discussions, communicate trade-offs effectively and make decisions with a focus on scalability, performance, and long-term impact.
• Collaborate effectively with cross-functional partners and other engineering teams to deliver impactful solutions.
• Mentor peers through pairing, feedback and knowledge sharing to support their technical and professional growth.
• Contribute to a healthy, inclusive team culture by role-modelling Zencargo’s values and building strong working relationships.

• Professional experience with Kotlin (or Java with a strong willingness to work in Kotlin)
• Solid understanding and hands-on experience with Spring Boot 3 for building scalable, maintainable backend services
• Strong knowledge of RESTful APIs, microservice architecture, and integration patterns
• Experience working with relational databases (e.g. Postgre
  
  SQL or MySQL) and designing efficient, maintainable schemas
• Familiarity with automated testing approaches (unit, integration, E2E) and test-driven development
• Understanding of monitoring and observability practices, including logs, metrics, and alerts
• Awareness of system performance, scalability, and technical debt — and how to address them
• Comfortable leading discussions around technical trade-offs, design decisions, and long-term code maintainability
• Strong collaborator who can work effectively with product managers, designers, and other engineers to deliver features that align with business goals
• Able to mentor peers through code reviews, pairing, and informal guidance
• Experience working in an agile delivery environment, contributing to planning and estimation
• Proactive, ownership-driven approach to delivering high-quality software