Senior Backend Engineer Jobs

Senior Backend Engineer

InStaff

Location:
Spain, Madrid

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

We’re looking for a Senior Kotlin Engineer to join our HQ Tech team and help design and scale the systems that power our platform. You’ll work in one of our product teams, building the backend foundations for real-world staffing solutions used by thousands of businesses and hundreds of thousands of workers daily.

Job Responsibility:

Design and implement scalable services that power Job&Talent’s staffing and workforce management platform
Collaborate with cross-functional product teams to deliver new features across our backend systems
Lead the development of critical components and drive architectural discussions
Mentor engineers and advocate for best practices in Kotlin development, testing, and observability
Continuously optimize performance, reliability, and scalability across our systems
Take part in end-to-end ownership — from design to deployment and monitoring in production

Requirements:

5+ years of experience in backend development using Kotlin or Java
Strong experience building and maintaining distributed systems at scale (1M+ users)
Proven track record delivering customer-facing applications
Experience owning the full lifecycle of a feature: design, coding, testing, deployment, and monitoring
Solid understanding of relational databases, transactions, and query optimization
Hands-on experience with monitoring systems — each team owns their product in production
A pragmatic problem-solver who enjoys tackling complex technical challenges

Nice to have:

Experience with event streaming, such as Kafka
Experience with Docker, Kubernetes, and AWS
Experience with git and the GitHub workflow, which we use extensively at Job&Talent
Knowledge of Linux servers and No-SQL experience (Redis)

What we offer:

competitive pay
meaningful benefits
the opportunity to shape what work looks like for millions around the globe

Additional Information:

Job Posted:
December 09, 2025

Employment Type:

Fulltime

Work Type:

Remote work

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