Senior Backend Developer (Java)

#vacancy #Java #EU #Poland
🧩 Twinslash
🚀 We’re Hiring: Backend Software Engineer (Java)

🌍 Location: Hybrid — Kraków, Poland
📅 Start: ASAP

We are looking for an experienced Backend Software Engineer to join a team developing modern, enterprise-scale digital solutions for an international financial services company. You will be responsible for building and maintaining backend applications, designing scalable APIs and microservices, collaborating with cross-functional teams, and delivering reliable, secure, and high-performing systems.

⚠️ Important: Candidates must be based in Poland and able to work in a hybrid format from Kraków.

💰 Rate: $4,600–5,100 gross

🛠 Core Skills & Technologies

Backend Development: Java 8/11/17+
Frameworks: Spring, Spring Boot
Architecture: Microservices, RESTful APIs
Databases: PostgreSQL, Oracle, SQL
Development Tools: Git, Maven, Gradle
DevOps & Delivery: CI/CD Pipelines
Methodologies: Agile, DevOps

📋 What You’ll Be Doing

Developing, enhancing, and maintaining backend applications using Java and Spring Boot

Designing, building, and supporting:
• REST APIs
• Microservices
• Enterprise backend services

Collaborating closely with:
• Product Owners
• Solution Architects
• Software Engineers
• QA Teams

Delivering new product features and technical enhancements

Designing reliable, secure, and high-performance backend systems

Participating in:
• Agile ceremonies
• Technical discussions
• Architecture reviews
• Sprint planning and refinement sessions

Contributing to CI/CD-based software delivery processes

Ensuring code quality through:
• Code reviews
• Automated testing
• Best development practices
• Continuous improvement initiatives

Supporting production environments and troubleshooting application issues when required

Driving improvements in:
• Development standards
• Engineering practices
• Tooling and automation
• Overall code quality

🎯 What We’re Looking For

6+ years of commercial experience in backend software development

Strong hands-on experience with:
• Java (8, 11, 17+)
• Spring Framework
• Spring Boot

Practical experience building:
• RESTful services
• Microservices-based applications

Strong knowledge of:
• SQL
• PostgreSQL
• Oracle Databases

Experience working with:
• Git
• CI/CD pipelines
• Maven or Gradle

Solid understanding of:
• Agile methodologies
• DevOps practices
• Software development lifecycle

Strong analytical and problem-solving skills

Excellent communication and collaboration skills

Fluent English

💡 Nice to Have

Experience working with:
• AWS
• Google Cloud Platform (GCP)
• Microsoft Azure

Knowledge of:
• Docker
• Kubernetes

Experience with messaging and event-driven systems:
• Kafka
• MQ

Background in:
• Banking
• Financial Services
• Other highly regulated industries

🧠 Soft Skills

Strong analytical and problem-solving mindset

Ownership and accountability

Attention to detail

Proactive approach to delivering solutions

Ability to work effectively in distributed international teams

Excellent communication and stakeholder collaboration skills

Continuous improvement mindset

📍 Work Format

Hybrid role in Kraków, Poland.

💬 Interested or know someone who fits?
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