June 12, 2026

Senior Java Engineer (with Angular)

Senior • Remote

5,500 - 6,700 USD

Krakow, Poland

N-iX is a global software development service company that helps businesses across the globe create next-generation software products. Founded in 2002, we unite 2,400+ tech-savvy professionals across 40+ countries, working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud, data, AI/ML, embedded software, IoT, and more, driving digital transformation across finance, manufacturing, telecom, healthcare, and other industries. Join N-iX and become part of a team where your ideas make a real impact.

We are seeking a highly skilled and motivated Senior Full-Stack Engineer (Backend-Leaning) with 6+ years of professional experience to join our growing core engineering team. In this role, you will be instrumental in designing, scaling, and maintaining our enterprise-grade financial SaaS platform. While you will work across the full stack, your core strength and primary focus will be on building robust, high-performance backend systems using Java and modern enterprise frameworks.

Requirements & Qualifications:

  • Experience: 6+ years of proven professional experience building robust B2B SaaS platforms or large-scale enterprise systems. Experience in the financial technology (FinTech) sector or building financial-grade systems is a strong plus.

  • Core Backend Stack (Must-Have): Strong expertise in Java, Spring Boot, Axon Framework, PostgreSQL, Elasticsearch, and Apache Kafka.

  • Testing Requirement (Must-Have): Proficiency in Groovy. Backend test coverage via Groovy is a mandatory part of the development process.

  • Frontend Stack (Must-Have): Solid experience with Angular and TypeScript for building modern web applications.

  • Infrastructure & DevOps (Must-Have): Hands-on experience with Docker Compose and Gradle.

  • Nice-to-Haves: Working experience with Keycloak, SonarQube, OpenAPI/Swagger, SendGrid, and Playwright is a plus.

Key Responsibilities:

  • Design, develop, and maintain secure, scalable, and resilient backend services using Java (OpenJDK), Spring Boot and Axon Framework.

  • Architect and optimize relational databases (PostgreSQL) and structured search solutions using Elasticsearch.

  • Develop responsive and clean user interfaces using Angular and TypeScript, ensuring seamless integration with backend REST APIs.

  • Implement event-driven patterns and messaging queues using Apache Kafka to ensure high-throughput communication.

  • Write and maintain comprehensive backend test coverage using Groovy. This is a strict, mandatory part of our development lifecycle.

  • Manage identity and access management solutions by leveraging Keycloak for financial-grade security and authentication.

  • Maintain high code quality through rigorous testing, code reviews, and analysis via SonarQube.

  • Containerize applications using Docker and Docker Compose, and manage CI/CD deployment pipelines within the Azure Cloud ecosystem.

  • Collaborate closely with cross-functional teams to define OpenAPI/Swagger specifications and integrate third-party services like SendGrid.

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Warsaw, Poland

6,000 - 6,140 USD

🏢 Summary: Senior Java Engineer role focused on building and maintaining scalable backend services and contributing to frontend development for a next-generation endpoint protection and detection platform. The position involves working in an Agile team on distributed microservices architecture, leveraging cloud platforms and AI-assisted development tools. The solution delivers real-time cyber threat prevention and response across multiple operating systems. 🗂️ Requirements: 5+ years of software engineering experience, Strong proficiency in Java, Experience with large-scale distributed systems, Experience with microservices architecture, Experience with AWS and/or GCP, Experience with Kubernetes, Experience with Kafka or similar messaging systems, Experience integrating APIs and data stores, Upper-intermediate English level 📃 Skills: Java, AWS, GCP, Kubernetes, Kafka, Microservices, REST, SQL, AI, Git 🏢 Description: N-iX is looking for a Senior Java Engineer to join a collaborative product team of around 8 engineers working on a complex, high-impact software platform. You’ll contribute across the stack, building scalable backend services and intuitive frontend experiences, while actively using AI-powered development tools to improve productivity and code quality. The team follows Agile best practices, values clean architecture, ownership, and continuous improvement. As an engineer, you’ll help to develop the platform that serves as an enterprise next-generation endpoint protection (EPP) + endpoint detection & response (EDR) solution that runs on Windows (as well as macOS, Linux, servers, etc.). It comes as a single, unified agent designed to prevent, detect, respond, and remediate cyber threats, including malware, ransomware, fileless attacks, and advanced persistent threats — all in real time. Responsibilities: Design, develop, and maintain backend services in Java Collaborate closely with backend, frontend, and QA engineers in an Agile/Scrum environment Write clean, testable, and well-documented code Integrate and work with APIs, data stores, and third-party services Use AI-assisted development tools (e.g., code assistants, testing tools, analysis tools) to improve delivery speed and quality Support production systems and participate in troubleshooting when needed Requirements: 5+ years of extensive software engineering experience Proficiency in Java Proven expertise in developing large-scale distributed systems and microservices architecture, with a focus on performance, scalability, and reliability Experience with cloud platforms (AWS and/or GCP) and Kubernetes (must) Experience with Kafka or similar solutions Excellent problem-solving skills Strong communication skills and ability to articulate technical concepts and influence engineering direction across teams, departments, and stakeholders Upper-intermediate level English