Jobs Java

Our Customer:

Our client is a fast-growing tech company that builds innovative web solutions. They are looking for a talented Backend Developer to design and deliver impactful features, contribute to new services, and help advance their platform. The team values collaboration, learning, and continuous innovation.
 

Your Tasks:

• Collaborate closely with the founding team and product managers.
• Ensure service availability and take part in on-call rotations.
• Drive innovation, continuously learn, and share knowledge with the team.

Required Experience and Skills:

• At least 5+ years of experience in server-side Java development.
• Strong hands-on experience with relational databases and SQL.
• Experience building and working with RESTful web services and APIs.
• Familiarity with Linux-based systems.
• Experience working in an Agile software development environment.
• Ability to write clean, reusable code, prioritizing readability over complexity.
• Self-driven and results-oriented, able to take ownership of tasks and see them through to completion.
• Comfortable working in a fast-paced environment.
• BSc in Computer Science or equivalent practical experience.
• English proficiency at Upper-Intermediate level or higher.

Would Be a Plus:

• Experience designing and implementing microservices architectures.
• Experience scaling applications and building highly available systems.
• Experience with caching solutions such as Memcached, Redis, or similar technologies.
• Experience with messaging systems such as RabbitMQ or equivalent.
• Experience with non-blocking and reactive web frameworks such as RxJava or Spring WebFlux.
• Experience with distributed streaming and processing platforms such as Kafka or Spark.
• Experience with parser generators such as ANTLR, JavaCC, or similar tools.

Requirements:
 

Commercial experience in Gambling / iGaming is required
Commercial GameDev experience is required (preferably slot games)
 

• 3+ years of experience in Java
• English — Upper-Intermediate (B2)
• Experience in math processing
• Experience with slot games
• Structured and analytical thinking
• Strong elaboration and communication skills
• Hands-on experience with AI tools as part of everyday work is a must

Strong knowledge of:

• Core Java, Collections, Streams, Lambdas
• Exception handling, Immutability, records
• Clean Code principles
• Spring Boot, Spring MVC (REST APIs), Spring Security (JWT)
• SQL, JPA
• JWT

Responsibilities:
 

• Development and support of backend services
• Participation in feature development and system improvements
• Close collaboration with game teams, QA, and product

Nice to have:
 

• JVM basics (heap/stack, GC, memory model)
• SOLID
• Spring MVC (filters, interceptors)
• Spring Security (filters, auth flow)
• Dependency Injection & IoC
• Validation (Bean Validation)
• API design (REST principles, versioning, error handling)
• Java concurrency fundamentals (basic understanding)
• Databases & Persistence: Transactions, Indexing basics, Hibernate
• Security: Secure coding practices, SQL injection prevention, OAuth2
• Testing: JUnit 5, Mockito, Integration testing basics
• DevOps & Tooling: Docker (basics, build/run), Git (branching, rebase), Maven / Gradle

Domain: Banking & Finance
Experience: 5+ years
Project Duration: August, 2026 – November, 2026(to be extended))
Format: Hybrid
Location: Kraków, Poland

About the Project

We are looking for a Java Developer with React experience to join a team developing and supporting modern, production-grade applications within the banking and finance domain.

The role combines backend development with Java, frontend development with React, API integration, and database technologies. The selected specialist will contribute to system design, application improvements, automation initiatives, and the delivery of scalable and reliable technical solutions.

Responsibilities

• Contribute to software architecture and system design initiatives
• Lead UI enhancements and improvements to strengthen user experience and application reliability
• Develop solutions in line with established design patterns and engineering best practices
• Analyze business and technical requirements and recommend effective, scalable solutions
• Create clear, detailed, and maintainable technical documentation for applications and services
• Build prototypes and proof-of-concepts to validate technical ideas, designs, and approaches
• Manage application and infrastructure changes throughout the service management lifecycle
• Drive automation initiatives and continuous improvements across service management processes
• Provide timely customer support by troubleshooting and resolving technical issues
• Collaborate closely with customers and stakeholders to understand requirements and deliver suitable technical solutions

Requirements

• 5+ years of hands-on experience developing production-grade applications within the Java ecosystem, including frontend development with React
• Strong expertise in Java development and Web API implementation
• Experience building scalable, secure, and high-performance backend systems
• Strong troubleshooting and problem-solving skills, particularly in fast-paced or high-pressure production environments
• Solid database design and SQL expertise, especially with SQL Server
• Advanced experience with T-SQL scripting, query optimization, and performance tuning
• Practical experience with DevOps practices, including CI/CD
• Strong understanding of the full Software Development Life Cycle (SDLC), including requirements analysis, system design, development, testing, deployment, and maintenance
• Excellent analytical skills, attention to detail, and the ability to solve complex technical challenges
• Strong communication and collaboration skills across technical and non-technical teams
• Fluent English

Tech Stack

• Java
• React
• Web APIs
• API Governance & Integration
• SQL Server
• SQL / T-SQL
• PL/SQL
• DevOps
• CI/CD
• SDLC

Location

• Hybrid from Kraków, Poland
• Important: the client requires office visits in Kraków 8 times per month

We are looking for a Senior DevOps / Backend Engineer (Java) to join our client's team on an outstaff basis.

Client: USA
Format: Full-time
Duration: 3+ months

Requirements:

• 4+ years of commercial experience
• Upper-Intermediate English (B2+) or higher
• Strong experience with AWS services: EC2, RDS, S3, ECS, Lambda, CloudFront
• Hands-on experience with Terraform
• Solid knowledge of Java and Spring Boot
• Experience with cloud infrastructure, deployment automation, and CI/CD pipelines
• Ability to work independently and communicate effectively within a distributed team

If you're interested, send us your CV, and we'll share more details about the project.

We are helping our partner — a fast-growing product company in the iGaming space — find a Middle Java Developer to join their backend team.

This is a product environment where backend engineering directly impacts platform stability, scalability, and business growth.

You won’t just “close tickets.” You’ll work on real systems, real architecture, and real technical challenges.

What this role is really about

You’ll be working on a high-load platform where:

• systems process real-time events;
• performance and reliability matter daily;
• backend services must scale under heavy load;
• technical decisions affect the whole product ecosystem.

The team builds and develops services end-to-end, with a strong engineering mindset and ownership culture.

What you’ll be doing

• Develop and improve backend services.
• Work with microservices architecture.
• Participate in technical discussions and solution design.
• Solve performance and scalability challenges.
• Collaborate closely with developers, QA, and product teams.
• Support and improve existing services while building new functionality.
• Take ownership of your work and engineering decisions.

What we’re looking for

• 3+ years of commercial experience with Java.
• Strong practical experience with:

  • Spring Boot;
  • PostgreSQL;
  • Kafka or similar messaging systems.

• Experience working with microservices.
• Good understanding of distributed systems principles.
• Experience with SQL and NoSQL databases.
• Experience with AWS or Kubernetes will be a plus.
• gRPC — nice to have.

But more importantly:

• You think beyond tasks.
• You can explain your technical decisions.
• You are proactive and structured in your work.
• You care about quality, not only delivery speed.

What you get

• Product company environment (not outsourcing).
• Real impact on the product and technical decisions.
• Strong engineering team and mature processes.
• Complex backend challenges and high-load systems.
• Remote work format.
• Fast-growing iGaming product with global scale opportunities.

We are helping our partner — a fast-growing product company in the iGaming space — find a Senior Java Developer to join their backend team.

This is not a “just write code” role.

This is about building systems, making decisions, and owning the result.

What this role is really about

You’ll be working on a high-load casino product, where:

• systems process real-time events
• performance matters
• architecture decisions have real impact

The team builds services from scratch and owns them end-to-end.

What you’ll be doing

• Build new backend services from scratch
• Participate in architectural and technical decisions
• Work with microservices and distributed systems
• Solve complex technical challenges
• Collaborate in a cross-functional team (product / QA / dev)
• Take ownership of what you build — not just tasks

What we’re looking for

• 5+ years of experience with Java
• Strong experience with microservices architecture (2+ years)
• Deep understanding of distributed systems
• Hands-on experience with:
  • Spring Boot
  • PostgreSQL
  • Kafka (or similar messaging systems)
  • SQL + NoSQL databases
• Experience with AWS / Kubernetes will be a strong plus
• gRPC — nice to have

But more importantly:

You think, not just code

You take ownership

You can explain your decisions

What you get

• Product company (not outsourcing)
• Real impact on architecture and product
• Strong engineering team
• Fast-paced environment with real challenges
• Remote work

We are looking for an experienced Senior Full Stack Engineer with Java, Python and React experience to join our development team and contribute to the development of a customized AI-driven platform.

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services; and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.

Responsibilities:

• Hand-On full stack development of innovative applications.
• Owning the entire development cycle, including design, architecture, development, and DevOps.
• Working in Extreme Programming methodology with remote pairing.

Requirements:

• BSc in Software Engineering or BS degree in Computer Science.
• 6+ years of experience in the following technologies: Java (must have), Spring.
• 2+ years of experience with Python (must have).
• 2+ years of experience in FE, mainly React (must have), and other modern JavaScript Framework/libraries.
• Experience with LLMs/AI/Prompt Engineering/MCP.
• Experience with Claude.code
• Experience with Data Analytics – big advantage.
• Experience in development in Kotlin – big advantage.
• Experience with Functional Programming and Java Streams.
• Experience with developing a reactive UI (Reactive JS).
• 2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
• 3+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
• Experience in DevOps development and Jenkins.
• Experience in designing, developing, and deploying cloud/hybrid-based solutions.
• Experience in developing and deploying in Container based environments (Kubernetes, Cloud foundry).
• Familiarity with the following design concepts: micro-services, service discovery, circuit breaker.
• Self-starter with the ability to appropriately priorities and plan complex work in a rapidly changing environment.
• Versatility and capability to switch easily between different tasks and technologies.
• Experience in assessing a broad range of information solutions and products.
• Strong critical thinker with problem solving aptitude.
• Good English - verbal and written.

About the company
We are a small profitable SaaS product team with high-ownership culture, running data retrieval and e-learning services for US and EU market.

About the role
We're seeking an engineer experienced in Payment orchestration. It will be mostly Backend work with some easy Frontend tasks.
Our tech stack is mainly Java Spring Boot for Backend, Astro and different JS frameworks for Frontend.

Responsibilities
- Working with API integrations with multiple PSPs
- Creation and improvement of payment routing logic
- Supporting subscription billing logic
- Making sure the code is resilient and observable
- Working on tokenization flows
- Development of webhook handlers

Requirements
- Strong experience with Payment orchestration at specialized platforms or large E-commerce products

- Experience with Java 5+ years
- Experience with vault and network (Visa, MC) card data tokenization
- Experience with integrating PSPs (Stripe, Adyen, Venmo, etc.)
- English B2

Advantage
- Experience working on payment orchestration platforms

- Experience developing payment orchestration functionality from scratch

Benefits
- Unlimited PTO policy
- Corporate devices (laptop, power station)
- Claude Code subscription

Job Title: Senior Backend Java Developer (IB / Partner Platform)
Company: VCG Tech Limited
Location: Remote
Employment Type: Full-Time

Role Purpose

This role owns the backend services behind our introducing-broker and partner program: partner onboarding, multi-level partner commission and rebate logic, and the reporting that partners rely on to understand their earnings. These services sit at the intersection of trading activity and partner payouts, so getting them right matters commercially and to the trust partners place in the program. You will design, build and operate Java microservices that must be accurate, reliable and maintainable on a live financial platform.

Day to day you will write and review clean, well-tested code, design sound APIs, and integrate with the trading platform and other backend services through REST and event-driven messaging. You will work in a focused, remote product team, collaborating closely with fellow engineers, product and QA, and sharing responsibility for the reliability of what you ship. As a senior individual contributor you will set a high bar in code review, mentor through example, and report into the team's engineering lead.

Key Responsibilities

Build and Own Partner Platform Services

• Design, build and maintain Java microservices for partner onboarding, commission/rebate processing and reporting
• Translate partner-program requirements into well-structured, testable services with clear ownership boundaries
• Design clean, versioned REST APIs and stable contracts that other teams can depend on
• Model and evolve relational data to keep partner and reward records accurate and auditable
• Take features from design through implementation, release and operation in production

Integrate Across the Platform

• Integrate with the MetaTrader 5 trading platform to source the trading activity that drives partner rewards
• Build resilient integrations with other backend services across onboarding, payments and reporting
• Design event-driven flows using messaging to keep data consistent across service boundaries
• Handle failure modes, retries and idempotency so financial calculations stay correct under real conditions

Reliability on a Live Financial System

• Treat correctness as a first-class requirement so commission and rebate outcomes are accurate and reproducible
• Instrument services with logging, metrics and alerting to detect and diagnose issues quickly
• Contribute to on-call readiness, incident response and post-incident improvements
• Identify and address performance, scalability and data-consistency risks before they reach production

Engineering Quality and Collaboration

• Write clean, well-tested code with meaningful unit and integration coverage
• Provide thorough, constructive code review and help raise standards across the team
• Maintain and improve CI/CD pipelines for fast, safe and repeatable releases
• Document key decisions, APIs and operational runbooks so the team can move quickly

Required Experience & Skills

• 5+ years of professional backend development in Java, including senior-level ownership of production services
• Deep, hands-on experience with Spring Boot and building microservices
• Strong API design skills and practical experience with REST
• Solid command of SQL and relational database design, including data modelling and query performance
• Experience with messaging and event-driven architectures, including delivery guarantees and idempotency
• Proven track record building and operating reliable services where correctness and data integrity matter
• Hands-on experience deploying and running services on AWS
• Proficiency with Docker and container-based workflows
• Strong testing discipline across unit and integration levels, with CI/CD and Git in everyday use
• Clear communicator who collaborates well asynchronously in a remote team and gives effective code review

Nice to Have

• Experience in trading, brokerage or fintech, especially CFDs/FX
• Familiarity with the MetaTrader 5 platform and its data model
• Experience building partner, affiliate, referral or commission/rebate systems
• Exposure to Kubernetes for orchestrating containerised services
• Experience with observability tooling such as Grafana, Prometheus or CloudWatch
• Familiarity with infrastructure-as-code using Terraform
• Experience working with payments flows such as deposits and withdrawals
• Comfort working with Jira and Confluence in a product-team setting

The product we are working on is one of TOP-3 navigation systems, complex web services, and other solutions related to it. The web and mobile apps handle information at a massive scale and extend well beyond the search, giving people and companies a lot of new, useful options.

This role focuses on executing critical migration projects within the backend infrastructure of the project. The Backend Infrastructure team is undertaking several large-scale migrations to modernize its systems, improve reliability, and reduce maintenance overhead. This TVC position will be instrumental in performing the hands-on work required for these migrations, working closely with the infrastructure team and other Backend teams.
 

Responsibilities:
 

• Execute Migrations: Actively participate in and drive the execution of large-scale code and system migrations across various backend services. Some examples include:
  • migrating event processing systems from custom infrastructure to managed infrastructure solutions;
  • Transitioning services from custom OpenCensus metrics collection to OpenTelemetry;
  • migrating custom metrics to standard OpenTelemetry metrics.
• Code Modification and Updates: Update and refactor existing codebases (primarily Java) to align with new libraries, platforms, and infrastructure.
• Testing: Work with the Infrastructure team to create a testing plan for migrations to ensure that changes do not break running services and execute the test plans.
• Collaboration: Work closely with the Backend Infrastructure team and other software engineers to understand migration requirements, plan execution strategies, and ensure smooth transitions with minimal disruption.
• Problem Solving: Investigate, debug, and resolve technical issues and complexities encountered during the migration processes.
• Documentation: Maintain clear and concise documentation for migration plans, processes, changes made, and outcomes.

• Best Practices: Adhere to software development best practices, ensuring code quality, and follow established guidelines for infrastructure changes.

   

Requirements:

• Location in Warsaw (Office-based role in Warsaw).
• 5+ years of hands-on experience in backend software development.
• Strong proficiency in Java programming.
• Strong communication and interpersonal skills, with the ability to collaborate effectively within a technical team environment.
• Bachelor’s degree in Computer Science, Software Engineering, or a related technical field, or equivalent practical experience.
• Good spoken and written English level — Upper-Intermediate or higher.
   

Nice to have:

• Experience with observability frameworks such as OpenTelemetry or OpenCensus.
• Familiarity with gRPC.
• Knowledge of Google Cloud Platform (GCP) services, particularly data processing services like Dataflow.
   

We offer:

• Opportunities to develop in various areas;
• Compensation package (20 paid vacation days, paid sick leaves);
• Flexible working hours;
• Medical insurance;
• English courses with a native speaker, yoga (Zoom);
• Paid tech training and other activities for professional growth;
• Hybrid work mode (∼3 days in the office);
• International business trips

• Comfortable office.

   

If your qualifications and experience match the requirements of the position, our recruitment team will reach out to you in a week maximum. Please rest assured that we carefully consider each candidate, but due to the amount of applications, the review and further processing of your candidacy may take some time.

We are looking for an experienced Senior Java Full Stack Engineer to join our development team.
 

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services, and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.
 

Responsibilities:

• Hands-on full-stack development of innovative applications
• Owning the entire development cycle, including design, architecture, development, and DevOps
• Working in XP with Remote pairing
   

Requirements:

• BS degree in Computer Science or equivalent combination of education and experience
• 5-6+ years of full-stack development
• 5-6+ years of experience in the following technologies: Java, Spring
• Experience with Functional Programming and Java Streams
• 2+ years of experience in front-end development with React
• Experience with developing a reactive UI (Reactive JS)
• 2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
• 2+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
• Experience in DevOps development and Jenkins
• Experience in development in Kotlin – an advantage
• Experience in designing, developing, and deploying cloud/hybrid-based solutions
• Experience in developing and deploying in container-based environments (Kubernetes, Cloud Foundry)
• Familiarity with the following design concepts: micro-services, service discovery, circuit breaker
• Self-starter with the ability to appropriately prioritize and plan complex work in a rapidly changing environment
• Versatility and the capability to switch easily between different tasks and technologies
• Experience in assessing a broad range of information solutions and products
• Strong critical thinker with problem-solving aptitude
• Good English - verbal and written