FinTech Client #3 | Backend Engineer

SD Solutions; Warszawa; On-site; PLN 297,239 - 382,165; Full time

Job summary

SD Solutions is seeking a talented Backend Engineer to design and maintain robust server-side systems for financial technology products. In this role, you will build scalable and high-performance backend services, collaborating with cross-functional teams to deliver reliable solutions.

The ideal candidate should have over 10 years of experience in backend engineering, expertise in Java or Kotlin, and a solid understanding of microservices architecture. The position is based in Warsaw, Poland, and offers an opportunity to work in a fast-paced fintech environment.

Qualifications

• 10+ years of professional experience as a Backend Engineer.
• Strong proficiency in at least one modern backend language.
• Experience with AI tools and a strong interest in applying them.

Responsibilities

• Design and implement scalable backend architecture for core financial products.
• Develop high-quality, maintainable server-side code.
• Collaborate with cross-functional teams to translate business requirements.

Skills

Java

Kotlin

Microservices architecture

Distributed systems

AWS

Problem-solving skills

English fluency

Education

B.Sc. in Computer Science or equivalent practical experience

Tools

Spring Framework

Docker

Kubernetes

Kafka

RabbitMQ

SQS

Job description

On behalf of FinTech Client #3, SD Solutions is looking for a talented Backend Engineer.

As a Backend Engineer, you will design, develop, and maintain robust server-side systems that power our financial technology products. You will focus on building scalable, secure, and high-performance backend services, handling critical data processing, API development, and integration with various systems. Working closely with frontend engineers, product managers, and other stakeholders, you will contribute to delivering reliable solutions that enhance user experience and support the key business objectives in a fast-paced fintech environment.

Responsibilities

• Design and implement scalable backend architecture, services, and APIs for core financial products and features.
• Develop high-quality, maintainable server-side code with a strong emphasis on performance, reliability, and security.
• Build and maintain RESTful APIs (and potentially GraphQL) to support mobile and web applications.
• Manage databases (relational and non-relational), optimize queries, and ensure data integrity and consistency.
• Collaborate with cross-functional teams (frontend, product, QA, DevOps) to translate business requirements into technical solutions.
• Participate in code reviews, write unit and integration tests, and contribute to improving engineering practices.
• Monitor system performance, troubleshoot production issues, and participate in on-call rotations as needed.
• Contribute to continuous improvement by refactoring legacy code, adopting best practices, and staying current with relevant technologies.

Requirements

• 10+ years of professional experience as a Backend Engineer (or similar role) building scalable server-side applications.
• Strong proficiency in at least one modern backend language such as Java or Kotlin.
• Solid experience with microservices architecture and distributed systems.
• Experience in domain ownership - a must.
• Hands‑on experience with relational databases (e.g., MySQL, PostgreSQL) and non‑relational databases (e.g., MongoDB, DynamoDB).
• Experience with AI tools and a strong interest in continuously exploring and applying them in everyday work are highly valued.
• Familiarity with message queue / streaming technologies such as Kafka, RabbitMQ, SQS, or similar.
• Good understanding of cloud platforms (preferably AWS or similar), including services for compute, storage, and networking.
• Experience building secure, high-performance APIs and handling sensitive data (especially valuable in fintech).
• Strong problem-solving skills, attention to detail, and ability to work effectively in a fast-paced, collaborative environment.
• Excellent communication skills and fluency in English.
• B.Sc. in Computer Science or equivalent practical experience.

Preferred Experience

• Expertise in Spring Framework (Spring Boot).
• Experience with fintech or payment processing systems, compliance requirements (e.g., PCI DSS), or secure transaction handling.
• Familiarity with containerization (Docker) and orchestration (Kubernetes).
• Knowledge of CI/CD pipelines and infrastructure as code.
• Exposure to modern development tools and practices (e.g., Git, automated testing, observability tools).

About the company

A fintech company that builds point-of-sale financing and consumer credit products for everyday service businesses. Their solution is deployed at thousands of service locations — including auto service centers, dental offices, optical clinics, and veterinary practices — and is managed through a no-fee mobile credit card.

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