What you will be doing
As a Backend Developer, you will be part of a Client-Aligned Team (CAT), responsible for building, deploying, and running integrations for our Banking-as-a-Service platform. Supported by a Solution Architect, you will deliver production-ready code, resilient pipelines, and clear documentation—helping our partners go live quickly and stay live safely.
Your work will focus on two main areas:
Customizing and composing our Banking-as-a-Service offering to meet the needs of specific clients.
Automation of the onboarding of new clients to the platform.
Development of a customer portal.
Your responsibilities:
BPM Customization & Development: Design, customize, and develop BPMN 2.0 processes using Flowable to orchestrate banking workflows and client-specific logic.
Unified API Layer: Implement and maintain a unified API layer over existing services, ensuring consistency, scalability, and ease of integration for partners.
Design & Implementation: Develop scalable, cloud-native applications in Java, Spring Boot, and microservices, leveraging the existing toolbox of our sophisticated BaaS platform.
Infrastructure & CI/CD: Work with GCP, Kubernetes, ArgoCD, and GitLab pipelines to establish and continuously improve CI/CD practices.
Operations & Support: Monitor and operate partner environments on GCP (Kafka, SQL/NoSQL, Elastic, Prometheus). Handle incidents, deliver change requests, and participate in the on-call rotation post-launch.
Quality & Observability: Write unit and contract tests, generate Swagger documentation, instrument OpenTelemetry traces, and build Grafana dashboards.
Code Review & Mentoring: Review pull requests, enforce clean coding practices, and mentor junior developers.
Documentation: Maintain BaaS runbooks, update internal knowledge bases, and contribute to self-service chatbot support.
Collaboration: Work closely with Solution Architects, Product Managers, QA/SRE, and partner developers to deliver secure, compliant, and resilient solutions.
Continuous Improvement: Identify friction points, propose enhancements to SDKs/configs, and support proof-of-concept demos for prospects.
Skills you should have
Core Engineering:
5+ years of Java backend development experience (Spring, Hibernate, REST APIs, microservices).
Strong knowledge of SQL and relational database design.
Practical experience with messaging systems (Kafka, Pub/Sub).
Experience with Maven and Git workflows.
Cloud & DevOps:
Understanding of cloud platforms (GCP preferred, AWS/Azure also welcome).
Familiarity with Docker, Kubernetes, Helm, Terraform, and CI/CD pipelines.
Monitoring and observability tools (ELK, Prometheus, Grafana).
Architecture & Modelling:
Exposure to BPMN 2.0 workflows (Flowable, Camunda, jBPM, etc.) is a strong plus.
Understanding of distributed systems, multithreading, and resilient design patterns.
Mindset & Behaviours:
Builder mindset with ownership of partner success.
Independent and self-organised, able to manage priorities effectively.
Clear communicator, able to bridge business and technical audiences.
Security-first approach (PCI/PSD2 awareness).
Collaborative, curious, and eager to learn.
Eager to share knowledge and support team growth.
Comfortable navigating a sophisticated and evolving environment.
Nice-to-have:
Contributions to open-source fintech projects.
Knowledge of ISO 20022, SEPA Instant, virtual IBANs, or card acquiring flows.
Experience with advanced observability stacks (Grafana/Loki/Datadog APM).
Familiarity with smart-contract platforms (Solidity, Rust).
Success in this role looks like:
Fast Delivery: ≥80% of user stories reach production within 10 days.
Quality First: ≥95% of partner conformance tests pass on first run.
Reliability: ≤1 high-severity incident per partner in the first 30 days post go-live.
Reusability: Your modules/scripts are adopted by other CATs.
Documentation: 100% of new products shipped with live runbooks and Swagger APIs.
What we offer
You will get an opportunity to work in an innovative, digital bank applying state of the art approaches and technologies.
You will be provided an Individual Development Budget, dedicated to enhancing your professional skills.
If your role permits, we also offer flexible work location.
You and your closest family will be covered with VIP-level private medical care which includes dental treatment and a hospitalisation package.
We care for our colleagues’ well being, therefore we cover psychological consultations if you ever feel you need such support.
Aion bank account without fee.
We co-sponsor your Multisport card and cover 50% of its cost.
You will work on computer equipment that delivers the best user experience — Apple MacBook.
Our office in Warsaw offers healthy snacks throughout the day.
Our process
Our process
We keep our recruiting process simple.
Step 1: Talk with one of our Recruiters about your experience and ambitions
Step 2: Meet with your future team manager for a technical interview
Step 3: Meet with Line Manager to discuss how we fit each other
Our note to you
Diverse teams really are the best teams. Research shows that some candidates may hesitate to apply for a job unless they meet every requirement. If you are excited about working with us, we encourage you to apply - even if you're not 100% sure. We are interested in getting to know you and learning about what you bring to the table.
Please note that we may close a job posting early if we receive a large number of exceptional applications.
Good luck!
