Senior Backend Engineer / Kotlin
- Remote
- Poznań, Poland
- PLN 19,500 - PLN 26,500 per month
- Kotlin
Job description
About the project
Join to Appunite to shape the future of out-of-home delivery for our client. We are building platform – a scalable, high-performance system that empowers carriers across Europe to deploy and optimize parcel locker networks.
In this role, you will work at the intersection of startup agility and enterprise scale. We move fast, experiment freely, and take full ownership of our work. We don't just "write code"; we solve real-world logistics challenges by building reliable backend systems that make global delivery smarter and more connected.
If you love turning complex architectural puzzles into elegant technical solutions, let’s build the future of logistics together!
This offer is planned for six months.
Senior: 19,500-26,500 PLN net/month B2B
Job requirements
What do we need for this position?
Design and maintain server-side applications with a focus on high availability and scalability.
Collaborate in a product trio, working closely with designers and product managers to ship impactful features.
Drive technical excellence by promoting best practices in code quality, security, and automated testing.
Proactively troubleshoot and optimize existing systems to ensure top-tier performance.
Stay curious – research emerging technologies and help us innovate our tech stack.
You’ll be a great fit if you have:
5+ years of experience as a Backend Engineer in cross-functional, agile environments.
Strong proficiency in Kotlin for backend development.
Hands-on experience with Spring Boot, building robust and scalable services.
Solid SQL skills, including schema design and performance tuning for relational databases.
Experience with event-driven architectures (e.g., Kafka, SNS/SQS).
Proficiency in REST API design and microservices architecture within cloud environments (preferably AWS).
Familiarity with DevOps tools, specifically Docker and Kubernetes.
Excellent communication skills in English (C1) and Polish, with the ability to explain complex technical concepts to various stakeholders.
Nice to have:
Experience in the logistics or e-commerce sector.
Knowledge of Infrastructure as Code (Terraform/CloudFormation).
Ability to lead technical workshops or mentor junior developers.
Our recruitment process is only 3 steps long:
Culture & mission fit meeting with Recruitment Team (abt 45 minutes)
Competency interview with team representatives (abt 60 minutes)
Technical task specified by the client
Competency interview with Client (abt 30 minutes)
If any other step of the recruitment process is necessary, we will inform you!
And finally, the decision, after which we can say “welcome on board.”
or
All done!
Your application has been successfully submitted!
Perks and benefits
Paid time off and sick days also for B2B contracts
Education & Training Budget
Remote first approach with flexible working hours
Spacious and stylish office if you prefer working on site
Organise team office space in your city
Private healthcare & life insurance
Co-financed multisport membership
Book formula - make a book-wish and we’ll grant it!
Being part of company events and meetups
English lessons with a native speaker
A brand MacBook to work on
Additional budget for team outings
Got questions? Feel free to contact us!
You will be in good hands! Our team will help guide you through the recruitment process and maintain communication throughout as well as share feedback with you.
Kinga Szałek
I see work as a genuine passion. For me, it’s about finding fulfillment and joy in what I do. By discovering new people, their unique talents and understanding their perspectives, I have the opportunity to build collaborative teams that continually grow. I invite you to join Appunite to be part of our thriving Team.
Milena Stareńczak
I believe that the Human Being always comes first: their story and needs. Only then we are able to come up with the best solutions. It's an approach that shines through in my role as a recruiter and psychologist on a daily basis. Still in search of creating the best recruitment process and candidate experience.
Magdalena Adamczak
Can a workplace be made up of inspiring people who are the missing piece of the company's puzzle and together create a space for activity and growth? Yes, at Appunite on a daily basis, the curiosity is learn about people and other perspectives never leaves me. I'm in doing sourcing amazing people, sounds good! Are you in?
Maciej Matwiejczyk
I'm passionate about making recruitment simple and effective, always upholding honesty and transparency throughout the process. I focus on the bigger picture in recruitment, ensuring every step aligns with long-term success. My approach prioritizes support and meaningful feedback for everyone involved, building strong connections and lasting matches.