Senior Kotlin Backend Developer - 10866583 NL

Itproposal; Amsterdam; On-site; EUR 90,000 - 130,000; Part time

Job summary

Itproposal is seeking an experienced Senior Kotlin Backend Developer to join an Agile Scrum team. You will contribute to the full SDLC from architecture to deployment and ongoing support.

The role follows a DevOps way of working with ownership of reliability, quality, and availability. Availability for 24/7 standby shifts is required, and the contract is for 6 months with immediate start in Amsterdam, NL.

Qualifications

• 10+ years of software development experience.
• Strong Kotlin development experience.
• Strong Spring Boot experience.
• Backend development with microservices architecture.
• DevOps practices and application ownership.
• Willingness to participate in 24/7 standby/on-call support.
• Experience working in Agile/Scrum environments.

Responsibilities

• Develop and maintain backend applications using Kotlin and Spring Boot.
• Design scalable, reliable software solutions for business-critical processes.
• Analyse and design architecture for applications and data.
• Manage deployments and releases; own code end-to-end.
• Participate in code reviews and continuous improvement.

Skills

Kotlin

Spring Boot

Backend development

Microservices

DevOps practices

Agile/Scrum

On-call support

Tools

Kubernetes

CI/CD

Docker

Job description

Senior Kotlin Backend Developer

• Location: Amsterdam, Netherlands
• Employment Type: Contract / Freelance
• Start Date: Immediate
• Duration: 6 Months
• Experience: 10+ Years
• Domain: Digital / Backend Development

Role Overview

• We are seeking an experienced Senior Kotlin Backend Developer to join an Agile Scrum team developing business-critical and strategic applications.
• The successful candidate will contribute to the full software development lifecycle, from architecture and development through to deployment and ongoing operational support.
• This role follows a DevOps way of working, with developers taking ownership of the reliability, quality, and availability of their applications.
• Availability for 24/7 standby shifts is required.

Key Responsibilities

• Develop and maintain backend applications using Kotlin and Spring Boot.
• Design and implement reliable, scalable, and maintainable software solutions.
• Analyse and design application and data architecture solutions.
• Develop applications supporting business-critical and strategic delivery processes.
• Write clean, efficient, and high-quality code.
• Enforce coding standards and software quality practices.
• Develop and maintain development best practices.
• Participate in code reviews and contribute to continuous improvement.
• Manage application deployments and releases.
• Take end-to‑end ownership of the team's code and applications.
• Monitor application availability, reliability, and performance.
• Participate in Agile Scrum ceremonies, including:
  • Daily stand‑ups
  • Backlog refinement
  • Sprint planning
  • Sprint retrospectives
• Work collaboratively with other developers, engineers, Product Owners, and technical stakeholders.
• Participate in 24/7 standby/on‑call support when required.

Essential Skills

• 10+ years of software development experience.
• Strong Kotlin development experience.
• Strong Spring Boot experience.
• Backend development.
• Microservices architecture.
• Application and data architecture.
• Software design and development.
• Experience developing business-critical applications.
• DevOps practices and application ownership.
• Code quality and development best practices.
• Deployment and release management.
• Agile/Scrum methodology.
• Willingness to participate in 24/7 standby/on‑call support.

Desirable Skills

• Experience with cloud-native application development.
• CI/CD and automated deployment experience.
• Containerization and Kubernetes.
• Observability and application monitoring.
• Experience working with large‑scale enterprise applications.
• Experience in highly available and business‑critical environments.

Key Competencies

• Strong software engineering and problem‑solving skills.
• Excellent teamwork and collaboration.
• Strong sense of ownership and accountability.
• Quality‑focused approach to software development.
• Ability to work effectively in Agile environments.
• Strong analytical and architectural thinking.
• Proactive approach to identifying and resolving technical issues.
• Ability to work under pressure and support critical applications.
• Excellent communication skills.
• Continuous improvement mindset.