Senior Java Engineer

N-iXUkraine16 days ago

Full-timeRemote FriendlyEngineering

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N-iX is looking for a Senior Java Engineer to join our team! Our client offers integrated telecom and cloud solutions, from carrier networks to UCaaS, and provides free assessments for communication needs.

Technical stack: Java 17+, Spring Boot (Web, Data JPA, Validation), MySQL/SQL, Maven/Gradle, Docker, Git, CI/CD (GitHub/GitLab), REST & OpenAPI/Swagger, Postman/Insomnia, basic Linux CLI.

Responsibilities:

Operational Product Development
Implement backend features and own them end-to-end (planning → release).
Design, document (OpenAPI), and maintain stable REST APIs.
Maintain data models and migration strategies (MySQL + Flyway/Liquibase).
Ensure performance and memory efficiency (profiling, query tuning).
Quality & Testing
Build and maintain unit/integration tests (JUnit/Mockito/Testcontainers).
Adhere to coding standards (reviews, static analysis) and ensure regression safety via CI.
Provide release notes and short technical documentation.
Architecture & Technology
Define service interfaces, error handling, and retry strategies.
Contribute to decisions between modular monolith and microservices.
Ensure security (auth, permissions, input validation, secure defaults).
Apply caching and messaging concepts (e.g., Redis, Kafka) where appropriate.
Operations & Observability Containerize services (Docker) and ensure CI/CD deployability. Establish logging/metrics/health checks; analyze and resolve incidents. Identify and reduce technical debt in a prioritized manner.
Collaboration & Delivery
Work closely with Product/Frontend/QA (refinement, estimation, review).
Share knowledge (short docs, pairing, demos); communicate clearly with stakeholders.
Hardware / Networking
Integrate and test interfaces to devices/on-prem systems (e.g., local REST/MQTT).
Consider networking aspects (HTTP, TLS, latency/time-outs, robust retries).

Requirements:

Strong proficiency in Java & Spring Boot from 5+ years of commercial experience
MySQL/SQL including indexes, transactions, basic tuning
Clean REST API design + OpenAPI documentation
Testing skills (JUnit/Mockito, integration tests with Testcontainers)
Docker, Git, CI/CD fundamentals
Redis/caching, Flyway/Liquibase
English level - Upper-Intermediate
Education: Computer Science degree, Mathematics

Nice to have:

Knowledge of Kafka/RabbitMQ, Kubernetes
Spring Security (OAuth2/OIDC),
Oracle Java, Spring Professional
AWS/Azure basics
Industry Knowledge in IoT/Embedded/Hospitality

We offer*:

Flexible working format - remote, office-based or flexible
A competitive salary and good compensation package
Personalized career growth
Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
Active tech communities with regular knowledge sharing
Education reimbursement
Memorable anniversary presents
Corporate events and team buildings
Other location-specific benefits
not applicable for freelancers

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