Senior Backend Engineer (Kotlin)

TL;DR

Senior Backend Engineer (Kotlin): Developing the core of a new storytelling app for personalized print products with an accent on architecture definition and scaling strategy. Focus on designing REST APIs, optimizing JVM-based services, and ensuring system reliability for millions of users.

Location: Must be based in or be able to relocate to Vienna, Austria. EU/Austria work permit is required (or a CS degree for permit application).

Salary: from €76,000 gross per year

Company

hirify.global helps over 10 million users turn their favorite moments into beautifully designed Photo Books and Prints using smart AI technology.

What you will do

• Develop the core of a new storytelling app written in Kotlin for personalized print products.
• Define the architecture and scaling strategy for a new product experience from the ground up.
• Design and develop new features and REST APIs in collaboration with frontend, product design, and management teams.
• Optimize existing architecture to support growing demand and scalability.
• Mentor team members and share expertise to foster an environment of constant improvement.

Requirements

• 7+ years of professional experience in backend application development.
• Strong proficiency in Kotlin or Java (JVM-based languages).
• Proven experience in designing and developing REST APIs.
• Experience with SQL (PostgreSQL, MySQL, MariaDB) and NoSQL (Redis, DynamoDB, MongoDB) databases.
• Permitted to work in the EU/Austria or holding a Computer Science degree for work permit eligibility.
• Ability to relocate to or be based in Vienna.

Nice to have

• Experience with AWS (S3, SQS, ECS, ECR, SES, RDS, CloudWatch), Docker, and GitLab.
• Knowledge of microservice infrastructure and CI/CD pipelines.
• Expertise in Kotlin Coroutines, Ktor, or Kotlin Multiplatform (KMP).
• Experience with statistical methods or machine learning algorithms.

Culture & Benefits

• Hybrid work model with 40% home office and flexible core hours.
• Annual gross salary starting from €76,000.
• 25 days of vacation per year, increasing with tenure.
• Daily free breakfast, lunches, and Italian-style coffee in an in-house eatery.
• Reimbursement for public transport in Vienna and company MacBook for personal use.
• Weekly in-house German lessons and premium membership for all hirify.global products.

Hiring process

• Introductory call with the Talent Acquisition team (30 min).
• General interview (45 min).
• Technical interview (1.5 hours).
• Final interview with the Leadership team (1 hour).