Jobs Java

On behalf of our Client from Canada, Mobilunity is looking for a Senior Java Backend Engineer.

Our client is an innovative HealthTech startup building an AI-, IoT-, and blockchain-powered platform designed to improve visual health and digital wellbeing. The platform integrates wearable devices, mobile applications, AI-driven services, and a blockchain-based reward system to help users monitor, understand, and enhance their eye health while promoting healthier digital habits.

Their goal is to transform the way people care for their vision by making eye health monitoring more accessible, personalized, and engaging. By combining cutting-edge technologies with a seamless user experience, they aim to empower users to take a proactive approach to visual wellness and build the next generation of digital healthcare solutions.

Responsibilities:

• Design, develop, and maintain scalable backend services.
• Build secure REST APIs and microservices.
• Develop data pipelines for processing real-time IoT sensor data.
• Integrate AI services and blockchain functionality.
• Design and optimize relational and NoSQL databases.
• Improve system performance, scalability, reliability, and security.
• Collaborate with product managers, AI, mobile, and hardware engineers.
• Write clean, well-tested, maintainable code and participate in architecture discussions.

Requirements:

• 5+ years of backend development experience.
• Strong Java (Spring Boot preferred); Python or Go is a plus.
• Experience designing scalable backend systems and REST APIs.
• Experience with AWS, Azure or GCP.
• Strong knowledge of Docker, Kubernetes, and CI/CD.
• Experience with PostgreSQL/MySQL and NoSQL databases (MongoDB or similar).
• Understanding of distributed systems, microservices, caching, performance optimization.
• Good written and spoken English.

Nice-to-have:

• Experience with IoT platforms or real-time data pipelines.
• AI/ML integrations.
• Blockchain/Web3 or token-based systems.
• DevOps and observability tools (GitHub Actions, Jenkins, Prometheus, Grafana, etc.).
• Knowledge of OAuth, JWT, encryption, and secure backend development.
• Experience in healthcare, wearable technology, or other regulated industries.
• Technical leadership or mentoring experience.

In return we offer:

• The friendliest community of like-minded IT-people
• Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the broadest variety of modern technologies
• Mobilunity Medical Insurance program designed to attend our teams’ needs
• Paid vacations and sick leaves, including 5 paid days per year that don’t require a sick note
• Perfect office location in the city-center (900m from Lukyanivska metro station with a green and spacious neighborhood) or remote mode engagement: you can choose a convenient one for you, with a possibility to fit together both
• No open-spaces setup – separate rooms for every team’s comfort and multiple lounge and gaming zones
• English classes in 1-to-1 & group modes with elements of gamification

• Neverending fun: sports events, tournaments, music band, multiple affinity groups

   

Come on board, and let’s grow together!

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

Join our Security and Compliance group as a Senior Software Engineer, where you'll work with a team of skilled developers on the client's complex core product, utilizing cutting-edge technologies such as Microservices, Spring Boot, Java, Kotlin, Reactive Programming, MongoDB, Neo4j, Kafka, and more.

Role and Responsibilities:
 - Participate in the end-to-end development lifecycle of new features used by thousands of enterprise customers globally.
 - Design, develop, and maintain robust and scalable Java applications.
 - Build and manage REST or GraphQL APIs.
 - Integrate and optimize NoSQL database solutions (e.g., MongoDB, Neo4j).
 - Collaborate with cross-functional teams to define requirements and deliver high-quality solutions.
 - Conduct code reviews to ensure adherence to high-quality standards and best practices.
 - Troubleshoot software issues and optimize performance in customer environments.
 - Engage in the full software development lifecycle, including requirements analysis, design, coding, testing, and deployment.
 - Stay current with emerging technologies and industry trends.
 - Work independently and within an Agile team to design and maintain network security orchestration software solutions.

Requirements:
- 3+ years of professional experience in Java development within a Linux environment.
- 2+ years experience with spring boot framework
- Willingness to code in Kotlin.
- Familiarity with front-end technologies, with an openness to learning frameworks like Angular and Apollo.
- Strong understanding of Spring Boot and experience with NoSQL databases (e.g., MongoDB, Neo4j).
- Proficient in data modeling and designing scalable data architectures.
- Basic knowledge of Docker and Kubernetes.
- Experience with Agile/Scrum development methodologies.
- Strong problem-solving skills, attention to detail, and ability to collaborate effectively.
- Excellent verbal and written English-language communication skills

Nice to have:
Background in networking or security software solutions.
Experience with front-end frameworks, preferably Angular 15+.
Familiarity with DevOps CI/CD methodologies and tools

The company is is an e-trading technology company, providing connectivity and automated workflow solutions for banks and asset managers operating in the Fixed Income and Derivatives markets. 

Location: Remote First; office location in London (flexible remote working locations within Europe)

Working Hours: Full time (UK 9-6)

IMPORTANT: The company is looking for people who built libraries/frameworks from scratch, building SDKs, working on low level components, tangibles, performance optimizations, etc. Open source contributions are relevant.

The company is focused on extreme programming. They are a core engineering focus company, they don’t use any frameworks. They use very few external libraries. E.g. people working on compilers, SDKs, Principal Engineers who built functions from scratch. TDD is important. People who actively practiced TDD tend to do better in their interview process.

You will work within a small team where you will pair-program (we operate using the extreme programming framework) to:

• Build resilient and adaptable fintech platforms and components in Java
• Refactor to improve code design
• Write lots of tests (every one of our commits is continuously and rapidly verified by thousands of tests)

• Automate the boring bits

   

Features of the way we work:

• We avoid silos by regularly rotating between teams to work on the whole system with an Our Code not My Code mindset and approach
• We practice trunk-based development and continuous integration: we treat every commit as releasable
• We treat broken tests as failures and revert where possible
• We practice TDD, BDD and DDD
• We automate as much as possible
• We pair program to ensure that everyone understands the context of what they are working on. We also believe that pairing drives quality, learning, cross-skilling, and builds empathy with other developers

• Sometimes we have to care about throughput and latency and so take this into account when writing code

   

Salary: dependent on experience up to £130,000 + Shares + Benefits

About the Role

We are looking for a Senior Software Engineer to join a growing engineering team responsible for maintaining and evolving mission-critical backend systems operating at scale.

This role combines software development, operational excellence, and system reliability. You will work on distributed backend services, troubleshoot production issues, improve system resilience, and contribute to the continuous enhancement of cloud-native infrastructure.

The ideal candidate is a hands-on backend engineer who enjoys solving complex technical challenges, working across multiple systems, and taking ownership of production environments.
 

Responsibilities

• Design, develop, and maintain scalable backend services using Java.
• Collaborate with cross-functional teams to deliver high-quality software solutions.
• Investigate, troubleshoot, and resolve production issues affecting customers and internal systems.
• Analyze root causes and implement long-term solutions to improve system stability.
• Improve application security, reliability, and operational efficiency.
• Build automation and tooling to reduce manual operational effort.
• Contribute to infrastructure improvements and deployment processes.
• Work with cloud-native technologies and distributed systems.
• Participate in on-call rotations and support critical production environments.
• Develop internal documentation, operational procedures, and technical runbooks.
• Continuously improve observability, monitoring, and incident response processes.
   

Required Qualifications

• 5+ years of experience in backend software engineering.
• Strong Java development experience.
• Solid experience with Spring Framework and related technologies.
• Experience designing and supporting distributed systems.
• Hands-on experience with cloud platforms (AWS preferred).
• Experience with containerized environments and Kubernetes.
• Familiarity with messaging technologies such as Kafka.
• Experience troubleshooting production systems and resolving complex incidents.
• Understanding of software security best practices.
• Strong problem-solving skills and ability to work independently.
• Excellent communication and collaboration skills.
   

Nice to Have

• Experience with Python for automation and tooling.
• Experience with Docker, Helm, and cloud-native deployment workflows.
• Familiarity with observability and monitoring tools.
• Experience with CI/CD pipelines.
• Knowledge of networking concepts, proxies, and load balancing technologies.
   

Technology Stack

• Java
• Spring Framework
• Python
• AWS
• Kubernetes
• Docker
• Kafka
• PostgreSQL
• Grafana
• GitHub Actions
   

Benefits

• A competitive salary and flexible compensation package
• Professional development tools (mentorship program, tech talks and trainings)
• Medical insurance
• Free corporate English classes and speaking clubs with a native speaker

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 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.

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

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