Senior Software Engineer (Java&Kotlin)

Contract: B2B
Rate: up to 140 zł/h net + VAT depending on skills and experience
Location: Remote within Poland
Start: ASAP
Project: Development of a JVM-based, event-driven platform with end-to-end ownership of software design, delivery, and production reliability.

Key Technologies/Areas

• Java, Kotlin, JVM

• Event-Driven and Distributed Systems

• PostgreSQL and NoSQL

• Docker, Kubernetes

• Cloud Platforms

• AI Coding Tools

Project Overview

We are looking for a Senior Software Engineer to join one of our client’s engineering teams. You will own features and components from refinement and system design through development, production deployment, monitoring, and post-release support.

Responsibilities

• Own the end-to-end design and delivery of features and components.

• Create, maintain, and align system designs using the C4 model with the domain target architecture.

• Develop reliable, production-ready, and well-tested software using Java and Kotlin.

• Manage estimation, sequencing, delivery risks, and cross-team technical dependencies.

• Own monitoring, reliability, production support, and participation in on-call.

• Contribute to frontend development where required.

• Use AI coding tools as part of your daily workflow.

Requirements

• 5+ years of professional software engineering experience, including proven ownership of features and components end to end.

• Solid foundation in the JVM, including Java and Kotlin.

• Production experience with event-driven systems.

• Good understanding of distributed systems, including idempotency, at-least-once vs exactly-once trade-offs, schema evolution, and partitioning.

• Experience with event-driven architecture, API gateways, and understanding when not to apply these patterns.

• Sound knowledge of relational and non-relational databases, including PostgreSQL, data modelling, and query performance.

• Proven experience delivering reliable software with unit, integration, and end-to-end testing.

• Ability to independently manage delivery, risks, sequencing, and cross-team dependencies.

• Experience owning system design at team scope using the C4 model.

• Familiarity with DORA metrics, stability, SSDLC compliance, velocity, and predictability.

• Experience using AI coding tools such as Claude Code, OpenAI Codex, opencode, Cursor, or similar.

• Familiarity with cloud service providers.

• Experience with Docker and Kubernetes.

• Fluency in Polish and advanced English (B2/C1)

Nice to have

• Frontend experience with React, TypeScript, and Node.js.

• Hands-on production experience with Kafka.

• Experience with Microsoft Azure.

Why join us?

Rite NRG is a vibrant outsourcing technology company driven by the Right People. We are dedicated to empowering businesses through innovative software solutions. We focus on building strong partnerships and providing top-notch software solutions that drive real business growth. Our business model revolves around collaboration and delivering impactful results for our clients.

Join us and be part of a team where great minds, Right Energy, and strong partnerships come together to shape the future of technology!

• Possibility of long-term cooperation on a full-time project engagement basis.

• Flexibility in organizing the provision of services, taking into account project requirements and agreed availability.

• Opportunity to contribute to technically advanced projects.

• Opportunity for international collaboration.