Senior Java Software Engineer, Data Enrichment

SEON Technologies Ltd.

Job Overview

Location

Budapest

Job Type

Full-time

Full Job Description

📋 Description

• Design and develop robust, scalable backend components using Java and the Spring framework (Spring Boot, Spring Web, etc.)
• Contribute to the redesign and modernization of a legacy Python-based system
• Contribute to API design, system architecture, and performance tuning for the team’s services
• Identify and resolve complex technical challenges, and continuously improve code quality, maintainability, and system performance
• Monitor, troubleshoot, and optimize the performance, availability, and throughput of the team’s services, including automating recovery from failure states
• Work closely with fellow engineers, Product Managers, and infrastructure teams to deliver features and improvements
• Participate in and, where appropriate, help drive design reviews, sprint planning, and technical discussions
• Share knowledge and provide clear, constructive feedback through code reviews and pairing, and help onboard and support fellow engineers
• Communicate effectively across the team and collaborate with other departments when needed
• Take ownership of the design, implementation, and delivery of features
• Provide clear effort estimates, contribute to defining the “definition of done,” and ensure timely, reliable delivery of your work
• Deliver high-quality code with a strong focus on testing, reliability, and performance
• Contribute to improving monitoring and observability for both new and existing systems
• Support production systems by diagnosing and resolving issues quickly
• Proactively improve system reliability and reduce operational burden through automation and architectural improvements

🎯 Requirements

• 3–5 years of hands-on backend development experience with Java (preferably Java 17+) and the Spring ecosystem (Spring Boot, Spring Web/MVC, etc.)
• Experience designing RESTful APIs and scalable production backend systems
• Solid understanding of multithreaded application development
• Familiarity with distributed systems, microservices, and performance optimization
• Experience with SQL/NoSQL databases
• Experience with containerization (e.g. Docker) and CI/CD workflows
• Experience with networking, proxies, and handling asynchronous or distributed workflows
• Ability to collaborate effectively in an agile development environment, including supporting fellow engineers through code review
• Strong analytical, problem-solving skills, and fluent written and spoken English

🏖️ Benefits

• Competitive salary
• Comprehensive benefits package
• Flexible working hours
• Professional development opportunities
• Collaborative and dynamic work environment

Skills & Technologies

Python

Java

Spring

Redis

Elasticsearch

Senior

Onsite

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SEON Technologies Ltd.

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About SEON Technologies Ltd.

SEON Technologies provides fraud prevention software for online businesses. Its platform combines device fingerprinting, IP and email analysis, behavioral biometrics, and real-time risk scoring to detect and block fraudulent transactions, account takeovers, and bonus abuse. The system integrates via API or SDKs into e-commerce, fintech, igaming, and BNPL workflows, enabling risk teams to automate decisions and investigate cases through a dashboard. Founded in Budapest in 2017, the company serves mid-market and enterprise clients globally.

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