Senior Java/Kotlin Developer

Salary: £56,000 - 96,000 per year

Requirements:

• We require 6+ years of professional software development experience, including a first role within a product company such as SaaS, fintech, or marketplace.
• We need deep proficiency in Java or Kotlin, with confidence in complex backend architectures, APIs, and data models.
• We are looking for a product-first mindset, with curiosity about user needs and the ability to propose improvements and own features end to end.
• We expect pragmatic architectural thinking, including experience with patterns such as Hexagonal Architecture for modularity and testing.
• We value the ability to balance long-term scalability with fast iteration.
• We are looking for someone who is comfortable using AI tools as an accelerating force while maintaining quality, integrity, and strategic oversight.
• We expect stewardship over the full feature lifecycle, including CI/CD, testing, observability, and monitoring.
• We require fluent English communication skills, both spoken and written.

Responsibilities:

• We partner closely with Product Managers and Designers to translate user needs into technical solutions.
• We own features end to end, from first sketch through release and beyond.
• We help maintain a fast delivery cadence while balancing speed, quality, and business impact.
• We challenge ideas constructively and contribute strong, experience-backed opinions.
• We use AI coding tools to accelerate delivery while keeping a human-in-the-loop approach for quality and strategy.
• We share best practices with the team on prompt engineering, AI-assisted refactoring, and maintaining a high quality bar.
• We build and maintain scalable backend systems and support decisions across architecture, APIs, data models, CI/CD, testing, observability, and monitoring.

Technologies:

• AI
• Backend
• CI/CD
• Hexagonal Architecture
• Support
• Java
• Kotlin
• Sketch
• Architect
• ArgoCD
• BigQuery
• Claude Code
• Cloud
• Cursor
• ElasticSearch
• GitLab
• Gradle
• Kubernetes
• Looker
• MongoDB
• PostgreSQL
• RabbitMQ
• Spark
• Spring
• Spring Boot
• Terraform
• TypeScript
• Vue
• dbt

More:

We are Malt, Europes leading freelance marketplace, connecting over 1,000,000 freelancers with more than 100,000 companies. Founded in 2013, we are transforming how work gets done through our tech-powered, human-centered platform. We are a diverse team of 600 Malters across six European countries, with a strong culture of equality and inclusive growth. We are backed by leading investors including ISAI, Serena Capital, Eurazeo Growth, Goldman Sachs, and BPI. This role is based in Paris or London in a hybrid setup, and we also offer a strong remote culture for team members in countries where we have a physical office and legal entity, including France, Germany, Spain, Belgium, the Netherlands, and the UK. We invest in learning and development through Tech Days, training, R&D, tech conferences, annual workshops, onboarding in Paris, stock options, a fully paid sabbatical every three years, free books, and team-building events. We are committed to an inclusive, diverse, and respectful workplace where everyone can thrive.

last updated 34 week of 2026