Java Software Engineer

Capital.com; Warszawa; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Private health insurance

Work abroad (up to 30 days)

Volunteering days

Hybrid work

Referral bonuses

Social events

Training and development support

Performance-based bonuses

Job summary

Capital.com is expanding its Backend Team in Warsaw, seeking engineers who design and implement scalable, low-latency backend services for a fintech platform. You will work on distributed systems, event-driven architectures with Kafka, and ensure security and compliance across client data and transactions.

You should be proficient in Java and Spring, with a strong grasp of concurrency, databases (SQL and No-SQL), and modern CI/CD patterns.

Qualifications

• Experience building backend services with Java and Spring.
• Strong knowledge of concurrency and asynchronous programming.
• Experience with distributed systems and event-driven architectures.

Responsibilities

• Design and build scalable backend services.
• Ensure reliability, fault tolerance, and performance.
• Collaborate with cross-functional teams and security stakeholders.

Skills

Java

Spring

Concurrency

Distributed systems

Security

SQL

No-SQL

Kafka

Kubernetes

CI/CD

AI tooling

Tools

Kafka

Kubernetes

CI/CD

SQL databases

No-SQL databases

Spring framework

Java

Job description

• We are currently growing our Backend Team and looking for great Engineers with an interest in trading to join us!


• Our Engineering team plays a pivotal role in ensuring the robustness, speed, and security of our product. Dedicated to enhancing performance, providing a best-in-class user experience, ensuring compliance, and safeguarding data, the team’s efforts directly impact our ability to offer clients a seamless and secure trading journey


• We believe great engineering talent not only delivers excellent code, but also lives our values. We are looking for someone who is eager to go fast, willing to innovate and grow, who knows how to listen, respect and support, strives to exceed client expectations, and takes full ownership to achieve real results


• Design and build scalable, low-latency, and high-performance backend services


• Develop distributed and asynchronous systems ensuring reliability and fault tolerance


• Optimise performance across JVM, databases, caching, and networking layers


• Apply security best practices in handling client PII and financial transactions


• Use event-driven architectures and modern messaging solutions (e.g. Kafka)


• Collaborate with cross-functional teams to align architecture with business needs


• Maintain high code quality through testing, code reviews, and CI/CD practices


• Leverage AI tools to accelerate development, testing, and delivery

Benefits

• Private health insurance


• Option to work abroad (up to 30 days a year)


• Volunteering days


• Hybrid working (where applicable)


• Referral bonuses


• Exciting social events


• Development and training support


• Performance-based bonuses

Ability to design and maintain scalable, low-latency, high-performance systemsAwareness of security best practices in handling PII and financial transactionsSolid knowledge of concurrency, multithreading, and asynchronous programmingExperience working in a product-led fast-paced environment as a team playerBasic understanding of network protocols and troubleshootingStrong understanding of distributed systems architecture and the client–server modelProven experience in FinTech, Banking, or related financial domainsConcurrency & Async programming: advanced understanding and hands-on experience in asynchronous programming methodsOperational Proficiency: Understanding and hands-on experience with Ops activities, Kubernetes, pipelines, Fit Flow and modern CI/CD patterns and strategiesEvents streaming: Understanding of the event driven architecture (Kafka or similar solutions)Java and Spring: Advanced knowledge of Java Core technologies and the Spring frameworkData Mastery: Proficiency with SQL databases, ensuring optimal performance, structure, and replicationAI tools: ability to effectively use AI technologies in engineering work e.g. applying AI for coding assistance, debugging, testing, documentation, and optimisation of workflowsAnalytical thinking: Ability to tackle and investigate complicated problems and convert it to the taskCommunication: Effective communication skills, especially with teams responsible for security, operations and productAdaptability to Rapid Changes: Demonstrated capability to adjust to quick technological shifts and evolving business requirementsOwnership and Accountability: Readiness to take ownership of tasks, issues as well as demonstrate accountability of the results and outcomePerformance: Knowledge of JVM performance optimization practicesIn-memory storage: Strong knowledge of in-memory cache solutionsNo-SQL: Experience working with no-SQL databases is a big plus