kotlin developer for Bookings

Enfint

Warszawa

On-site

PLN 210,000 - 331,000

Full time

14 days+
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Benefits offered by this job

Virtual Stock Option
L&D budget €2000
On-site gym
Health & life insurance
26 days paid leave
Sabbatical after 3 years
Referral Bonus

Job summary

SumUp ищет опытного бэкенд-инженера для поддержки продукта Bookings. Ваша задача — проектировать и развивать масштабируемые серверные решения, сотрудничать с командами фронтенда и мобильной разработки, и участвовать в проектировании архитектуры API и систем.

Опыт с Kotlin/Java, Spring Boot, PostgreSQL, Kafka и AWS обязателен. Кандидаты должны владеть CI/CD, наблюдаемостью и принципами CQRS/Event Sourcing; приветствуется наставничество и ориентация на ценность для mercha nts.

Qualifications

  • 5+ лет опыта бэкенд-разработки.
  • Свободно владение Kotlin или Java и глубокий опыт Spring Boot.
  • Опыт работы с PostgreSQL, Kafka, Docker, Kubernetes и AWS.
  • Понимание RESTful API, распределённых систем и архитектур CQRS/Event Sourcing.
  • Опыт CI/CD, GitHub Actions и инструментов наблюдения Grafana/Honeycomb.
  • Способность работать в команде, наставничество, фокус на ценности для mercha nts.

Responsibilities

  • Разрабатывать, строить и поддерживать масштабируемые бэкенд-системы для продукта Bookings SumUp.
  • Сотрудничать с фронтенд- и мобильными инженерами для добавления новых функций и совершенствования API.
  • Участвовать в техническом планировании, обзоре кода и обсуждении дизайна.
  • Постоянно оптимизировать производительность, обеспечивать наблюдаемость и высокую надёжность.
  • Вносить вклад в формирование технической дорожной карты Sell Online платформы.

Skills

Java/Kotlin
REST APIs
Distributed systems
CQRS/Event Sourcing
CI/CD

Tools

Docker
Kubernetes
PostgreSQL
Kafka
Spring Boot
GitHub Actions
Grafana/Honeycomb

Job description

Описание

SumUp provides simple and affordable business tools that help more than 4 million small businesses across 36 markets start, run, and grow. Its financial tools support payments, finance, and customer relationships, while the Sell Online Tribe develops Online Store and Bookings products that help merchants manage appointments, showcase offerings, and accept payments.

Задачи
  • Design, build, and maintain scalable backend systems supporting SumUp's Bookings product;
  • Collaborate with frontend and mobile engineers to deliver new features and improve APIs across web, iOS, and Android;
  • Participate in technical planning, code reviews, and design discussions to ensure clean, testable, and maintainable code;
  • Continuously optimise performance, ensure observability, and uphold high reliability standards;
  • Contribute to shaping the technical roadmap for the Sell Online platform.
Требования
  • Have 5+ years of professional backend engineering experience;
  • Be fluent in Kotlin or Java and have deep experience with Spring Boot;
  • Have experience with PostgreSQL, Kafka, Docker, Kubernetes, and AWS;
  • Understand RESTful APIs, distributed systems, and event-driven architectures such as CQRS and Event Sourcing;
  • Have experience with CI/CD pipelines, GitHub Actions, and observability tools such as Grafana or Honeycomb;
  • Thrive in collaborative teams, mentor peers, and care about delivering real value to merchants;
  • Nice to have: familiarity with gRPC, Protobuf, or backend/database-level performance optimisation.
Условия
  • Salary range: 18 850 - 29 660 PLN per month;
  • Virtual Stock Option programme;
  • Annual L&D budget of €2000 for conferences and further education;
  • Fitness support, including an on-site gym and a subsidised Multisport Card;
  • Health insurance coverage for the employee and family, plus life insurance;
  • 26 Days of paid leave plus public holidays and special leave days;
  • One-month sabbatical after 3 years of service;
  • Referral Bonus.
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