Backend Software Developer

beyonnex.io

Backend developer creating Kotlin/JVM services that monitor millions of IoT devices. Supporting beyonnex’s climate-smart real-estate platform and reducing building energy costs and CO2 emissions.

Posted 8/5/2026full-timeRemote • 🇩🇪 GermanyMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing and maintaining backend services for IoT applications, with a strong focus on scalability and stability. Proficient in Kotlin or Java, with a solid understanding of the software engineering lifecycle and AI-driven development processes.

Highest-signal resume keywords

Kotlin ProficiencyJava ProficiencyBackend Service DevelopmentSoftware Engineering LifecycleC1 English Communication

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Applicant Tracking System Keywords

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Hard Skills

KotlinJavaBackend DevelopmentSoftware Development LifecycleAI-Driven DevelopmentIoT Device ManagementSystem ScalabilityUser Feedback IntegrationTesting and DeploymentProblem-Solving

Soft Skills

Proactive MindsetClear Communication

Industry Keywords

Enterprise IoTSmart Energy SolutionsSoftware DevelopmentProduct CollaborationGermany

Tech Stack

Tools & technologies

IoTJavaKotlin

About the role

Key responsibilities & impact

Further develop beyonnex's Enterprise-IoT-Suite and services
Build and maintain a stable and scalable technological foundation for the strategic development of the group
Develop backend services to monitor and control millions of IoT devices, including sensors and actors
Participate in the full software engineering lifecycle: requirements, design, development, testing, deployment, maintenance, operations, and improvements based on user feedback and usage metrics
Work with an AI-driven software development process
Collaborate closely with product experts and product owners to build smart-energy solutions

Requirements

What you’ll need

Proactive, problem-solving mindset
Ability to communicate complex ideas clearly and concisely in English at C1 level or better
At least 3 years of practical experience working as a Software Developer
Bachelor’s degree in Computer Science or a related field, or comparable education and experience
Proficiency in Kotlin, Java, or similar JVM languages
Located in Germany

Benefits

Comp & perks

Modern hardware and the opportunity to work with cutting-edge technologies
100% remote work possibility
Office in Hamburg (Hammerbrook) and Munich for more personal collaboration
Space and budget for personal growth
Flexible working hours
30 days vacation
Events for employees to celebrate achieved goals and team spirit
Community of Practice and Knowledge Nuggets for improving skills
Corporate Benefits and Mental Health Programme
Subsidized Urban Sports Club Membership
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Coffee, tea and water for free in the office