Lead Software Engineer (Scala/Java)

LoopMe; Kraków; Hybrid; PLN 240,000 - 320,000; Full time

Job summary

A leading ad technology firm in Kraków is seeking a Backend Engineering Leader to build and lead a team responsible for a high-performance advertising exchange. This role requires strong Scala experience and a proven ability in software engineering, focusing on high-traffic systems. The position offers a flexible hybrid working model, an annual performance bonus, and unique workation opportunities.

Benefits

Flexible working schedule

Annual performance bonus (up to 8%)

One month of workation

International work environment

Multikafeteria

Qualifications

• 3+ years of Scala programming experience.
• 2+ years of AdTech experience (DSP, SSP, Exchange).
• 6+ years of software engineering experience.
• Proven track record of designing and delivering large scale software systems.
• Understanding of microservices and distributed systems with hands-on experience.
• Experience in high capacity, high traffic, high availability systems.
• Experience working in an agile environment.

Responsibilities

• Build and lead a team of engineers working on the exchange.
• Design, build, and evolve backend services for the advertising ecosystem.
• Translate the advertising exchange from Scala to Java.
• Define and own APIs and developer tools.
• Collaborate with engineers, system architects, QA, and Operations.
• Lead technical discussions to improve product and process.
• Mentor engineers and raise the bar for code quality.
• Deliver quality work on time driving developer productivity.

Skills

Scala programming

Software development

Microservices

Distributed systems

Data engineering

Education

BS in Computer Science or related field

Tools

Kafka

Job description

LoopMe is the leading in-app monetization and programmatic advertising platform. We reach a mobile audience of over 900 million monthly unique users globally and process over 200 billion ad requests. The Chartboost SDK is the highest-integrated independent mobile ad SDK and through the Chartboost Exchange, Ad Network and other services, we empower mobile app developers to build businesses, while connecting advertisers to highly engaged audiences.

What we need

We are looking for a backend engineering leader to help build our newly formed Exchange team. You'll work on a system that processes hundreds of thousands of requests per second and conducts a real‑time auction to find and deliver the most effective ads from our global partners. We trust our engineers to own this critical system and handle the full life cycle of feature development, from initial design all the way to shipping into production.

What you’ll be doing

• Build and lead a team of engineers working on our exchange
• Design, build, and evolve our backend services and frameworks for our advertising ecosystem
• Help translate our advertising exchange from Scala to Java
• Define and own APIs and developer facing tools that improve how teams ingest, process, and use data
• Work effectively with other engineers, system architects, QA, and Operations teams to implement enhancements and issue resolutions
• Lead technical discussions and come up with innovative ways to improve the product and process
• Troubleshoot issues with applications, technologies, and infrastructure
• Mentor engineers across the team, raising the bar for code quality, testing, and software craftsmanship
• Think creatively and work independently - collaborating with others as needed to maximize efficiency and throughput
• Deliver quality work on time while driving developer productivity across the organization

Qualifications

• BS in Computer Science or related field
• 3+ years of Scala programming experience
• 2+ years of AdTech experience (DSP, SSP, Exchange)
• 6+ years of software engineering experience
• A proven track record of designing and delivering large scale software systems
• You have a deep understanding of microservices and distributed systems with hands‑on experience implementing them at scale
• You are experienced with software development in high capacity, high traffic, high availability websites/systems
• You have experience working in an agile environment

The following experience would be a plus

• Background working with or building mobile SDK or mobile games
• You have worked with distributed messaging services, like Kafka
• You love talking about the intricacies of OpenRTB
• Strong skills in data engineering

Benefits

• International work environment
• Flexible working schedule with a hybrid working model (50% of the worktime from the office)
• Annual performance bonus (up to 8%)
• One month of workation (work from any location worldwide for one month)
• Multikafeteria