Senior Java Software Engineer

SD Solutions; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

FinTech Client #3 is seeking a Senior Backend Engineer to own the design and implementation of regulatory-compliant backend services and data pipelines. Join a team building event-driven automations with Kafka, integrating Verdata and Salesforce, and modernizing legacy systems for scale.

As a Senior BE Engineer, you will design scalable APIs, ensure data integrity across financial systems, and collaborate with Legal, Compliance, and engineering teams to translate complex requirements into robust

Qualifications

• 5+ years of experience in Software Development (Backend focused).
• Experience in building scalable APIs, working with microservices, and understanding distributed systems.
• Experience with cloud-based infrastructure (AWS).
• Fluent in English, both written and spoken.

Responsibilities

• Design & Build: Lead the design and implementation of backend systems and scalable microservices that ensure regulatory compliance and legal process automation (e.g., IVV, Due Diligence).
• Data Integrity & Scale: Work with large datasets and oversee complex data pipelines, ensuring absolute data integrity across critical financial systems.
• Drive Modernization: Lead engineering modernization efforts, including significant refactoring of legacy code and migration to a modern, distributed architecture to improve system resilience.
• Automation & Integration: Replace manual operations with event-driven automation (Kafka) and maintain robust integrations with third-party providers (Verdata, Salesforce, and more) to support business scale.
• Cross-Functional Collaboration: Collaborate closely with Legal, Compliance, and engineering teams to translate complex regulatory requirements into accurate, high-quality technical solutions.

Skills

Ownership

Problem solving

Fluent English

Education

B.Sc. in Computer Science

Tools

Java

Kotlin

AWS

Kafka

Snowflake

Spark

DBT

Python

Verdata

Salesforce

Job description

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

This position offers a unique opportunity to work at the intersection of technology, compliance, and data. As a Senior BE Engineer, you will take ownership of ensuring the integrity of critical processes - such as Compliance Control, Due Diligence, Legal Automation, and more. You will be responsible for the full lifecycle of these systems, driving both architectural modernization and day-to-day stability. Your work will range from designing new automated capabilities to rigorously refactoring existing flows, deep-diving into complex logic to optimize alerts, and ensuring our production environment remains robust at scale. We are looking for someone who enjoys diversity, wants to understand the "business behind the code," and is eager to replace manual operations with sophisticated, event-driven automation.

Responsibilities:

• Design & Build: Lead the design and implementation of backend systems and scalable microservices that ensure regulatory compliance and legal process automation (e.g., IVV, Due Diligence).
• Data Integrity & Scale: Work with large datasets and oversee complex data pipelines, ensuring absolute data integrity across critical financial systems.
• Drive Modernization: Lead engineering modernization efforts, including significant refactoring of legacy code and migration to a modern, distributed architecture to improve system resilience.
• Automation & Integration: Replace manual operations with event-driven automation (Kafka) and maintain robust integrations with third-party providers (Verdata, Salesforce, and more) to support business scale.
• Cross-Functional Collaboration: Collaborate closely with Legal, Compliance, and engineering teams to translate complex regulatory requirements into accurate, high-quality technical solutions.

Requirements:

• 5+ years of experience in Software Development (Backend focused).
• Strong proficiency in Java or Kotlin in production environments.
• System Design: Experience in building scalable APIs, working with microservices, and understanding distributed systems.
• Experience with AWS and cloud-based infrastructure.
• Ownership Mindset: We don’t just resolve tickets; we look at the bigger picture, understand the business logic, and take responsibility for the quality of our delivery.
• Excellent problem-solving and system design skills.
• B.Sc. in Computer Science or equivalent practical experience.
• Fluent in English, both written and spoken.

Advantages:

• Strong proficiency in SQL and experience working with relational databases.
• Python.
• Experience with Snowflake, Spark, or DBT.
• Experience with Event-Driven Architecture and Kafka.
• Background in Fintech, Banking, or regulatory environments.
• Experience with AI development tools like Cursor and Claude Code.

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.