Principal Backend Engineer (API, Java, Go, Rust)

Our requirements

• 15 + years of overall technology experience, including 10+ years in backend and microservices engineering.
• Strong background in API architecture, design, and development, including documentation, gap analysis, and data modelling.
• Expertise in Java (Spring Boot); additional experience in Go or Rust is beneficial.
• Advanced understanding of distributed system design, JVM tuning, and performance diagnostics.
• Hands‑on knowledge of containerisation (Docker, Kubernetes) and service meshes.
• In‑depth experience with Kafka (event streaming platforms) – cluster setup, configuration, producer/consumer development.
• Familiar with CI/CD, DevOps, and cloud delivery (AWS / Azure / Private Cloud), including network, firewall and IAM concepts.
• Expertise in observability and monitoring (Splunk, Grafana, Prometheus, Jaeger, Kiali, Open Telemetry).
• Strong SQL skills and understanding of distributed databases.
• Degree in Computer Science, Engineering or related field.
• Excellent communication, problem‑solving, and stakeholder engagement skills in English.

Optional

• Background in financial applications, especially payments and core banking systems.
• Proven ability to design technical solutions within large global organisations.
• Experience mentoring and leading teams of engineers across geographically distributed locations.
• Keen interest in modern development practices: API‑first architecture, DevSecOps, Cloud‑native engineering, and Inner Sourcing.

Your responsibilities

• Deliver enterprise‑grade payment processing software, establishing technical standards and ensuring engineering excellence.
• Build and maintain scalable microservices and API layers using Java (primary) and Go / Rust (advantage).
• Deliver high‑quality code artefacts with comprehensive test coverage, ensuring quality gates are met or exceeded.
• Design for high availability, resilience, and performance, implementing best practices in distributed system architecture.
• Modernise existing payment components for cloud‑native environments, guiding transformation and migration strategies.
• Lead by example—set technical direction and development standards for global teams.
• Provide expert advice on both technical and business issues, influencing design decisions and system roadmaps.
• Partner with architecture, DevOps, and security teams to align design, CI/CD, and infrastructure automation pipelines.
• Analyse and resolve architectural blockers, ensuring that delivery progresses according to roadmap objectives.
• Evaluate vendor technologies, define implementation standards, and develop cost‑effective technical strategies.
• Act as a subject‑matter expert in APIs and Payments within the programme.
• Provide mentoring and coaching for engineers, promoting an engineering culture based on responsibility, experimentation, and continuous learning.
• Work closely with cross‑functional teams to ensure DevSecOps best practices, automated testing, and observability are embedded.
• Note: Detailed project information will be shared during the recruitment process.

About the project

This is how we organize our work

This is how we work on a project

• Continuous Deployment
• Continuous Integration
• DevOps

What we offer

• Flexible cooperation model
• Hybrid work setup – two days a week from the office
• Collaborative team culture – work alongside experienced professionals eager to share knowledge
• Continuous development – access to training platforms and growth opportunities
• Comprehensive benefits – including Interpolska Health Care, Multisport card, Warta Insurance, and more
• High quality equipment – laptop and essential software provided

Benefits

• sharing the costs of sports activities
• private medical care
• sharing the costs of professional training & courses
• life insurance

Mindbox Sp. z o.o.