Senior Backend Engineer at iKnowHow S.A.

Municipal Unit of Neo Psychiko, Attica, Greece -

Full Time

Start Date

Immediate

Expiry Date

07 Jun, 26

Salary

0.0

Posted On

09 Mar, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Java EE, Spring Boot, Microservices, PostgreSQL, Kafka, RabbitMQ, REST APIs, GraphQL, Docker, Kubernetes, Helm, CI/CD, Jenkins, JUnit, OAuth2, OpenID Connect

Industry

Software Development

Description

iKnowHow SA is a leading Software & Robotics Solutions company operating internationally. We aim to empower businesses with innovative software and robotics solutions. As a rapidly growing company with a vision for the future, we are committed to fostering a dynamic and collaborative workspace where creativity and technical excellence thrive. Based in Athens, our team is now expanding rapidly through ambitious projects in defense-grade digital systems, swarm robotics, AI, and custom software solutions. We are now looking for a skilled and versatile Senior Backend Engineer to design, develop, and maintain secure, scalable backend services across multiple mission-critical platforms in the defense and homeland security domains. Responsibilities Design, develop and maintain back-end of large web-based Java EE/Spring applications with microservices architecture. Write clean, maintainable, and testable code following industry best practices. Contribute to system design discussions and propose scalable, fault‑tolerant solutions. Improve system performance, reliability, and observability. Mentor junior and mid‑level engineers, perform code reviews, and guide best practices. Advocate for architectural improvements, performance optimizations, and engineering excellence. Participate in the technical analysis, documentation, implementation, and integration. Work closely with frontend engineers, DevOps, product managers, and QA to deliver end‑to‑end solutions. Build and optimize complex database schemas, queries, and stored procedures with PostgreSQL. Implement and maintain event‑driven architectures using messaging systems such as Kafka, RabbitMQ, or similar. Participate in API design (REST or GraphQL) and integration with external/internal services. Bachelor's or Master's degree in Computer Science or other related field. 5+ years of experience building backend services in Java, using Java EE and/or Spring (Spring Boot/ Modulith). Solid experience designing and implementing backend microservices and modulith architectures, including service boundaries, inter-module communication, and dependency management. Hands‑on experience with event‑driven systems (Kafka, RabbitMQ, Pulsar, or similar). Strong expertise in SQL, database design, and performance tuning (preferably PostgreSQL). Experience developing and consuming REST APIs, with working knowledge of gRPC and GraphQL. Experience working with structured data formats, including JSON and XML. Experience integrating authentication and authorization solutions, ideally Keycloak, including OAuth2, OpenID Connect, and role-based access control. Basic to intermediate knowledge of CI/CD pipelines, with experience using tools such as Jenkins. Strong testing mindset (JUnit, integration testing frameworks). Expert-level experience with Docker, including container image creation, optimization, and security best practices. Hands-on experience deploying and operating containerized backend services on Kubernetes, including the use of Helm charts. Excellent problem‑solving skills and attention to detail. Strong communication and ability to collaborate in cross‑functional teams. Ownership mentality with a proactive approach to improving systems. Νice to have: Familiarity with secure backend development practices, especially for mission-critical or C2 systems, including secure communication, access control, auditing, and logging. Understanding of observability concepts such as centralized logging, metrics, and tracing in distributed systems. Attractive salary package Comprehensive health insurance plan and additional benefits Career development and growth opportunities through a structured Job Grade System Continuous learning opportunities, including personalized training seminars and access to cutting-edge technologies Leadership role in a fast-growing company with a strong emphasis on innovation and technical excellence

Responsibilities

The Senior Backend Engineer will be responsible for designing, developing, and maintaining secure, scalable backend services for mission-critical platforms, primarily using Java EE/Spring with a microservices architecture. Key duties include writing clean, testable code, improving system performance, and mentoring junior staff.