Jobs Java

Are you passionate about building secure, high-performance platforms? 

We are looking for a Senior Java Developer to join our team and work on a cutting-edge security platform. This is a remote role open to candidates across Europe and Ukraine.
At Sigma Software, we create innovative solutions for complex ecosystems, ensuring security, scalability, and compliance at every step. You will be part of a talented engineering group designing the unified access layer for distributed services.
Why join us? You will work on a mission-critical project with advanced security architecture, collaborate with skilled professionals, and contribute to a platform that supports global-scale operations.

Customer

Our customer is a large-scale technology-driven organization operating a complex distributed ecosystem. They are building a unified access and security layer to ensure consistent governance, compliance, and high-performance data access across multiple services. The company is committed to cutting-edge security architecture, multi-tenant isolation, and global regulatory compliance.

Project

The project focuses on developing a centralized platform access layer that integrates API gateway capabilities, service orchestration, data composition, and fine-grained Attribute-Based Access Control (ABAC). This system will serve as the foundation for security and governance across the entire ecosystem, supporting complex organizational hierarchies, regional compliance, and strict enforcement guarantees.

RESPONSIBILITIES 

• Design and evolve the platform access architecture for a large-scale distributed ecosystem
• Build and maintain a unified API layer over multiple distributed services
• Implement fine-grained ABAC authorization at scale, supporting complex hierarchies and relationships
• Develop fail-closed security architectures with strict enforcement guarantees
• Manage regional compliance, data residency, and routing requirements
• Ensure consistent data visibility rules across all products and services
• Design high-performance authorization evaluation systems and policy engines
• Maintain auditability, traceability, and security transparency mechanisms
• Collaborate with platform and product teams on API and access design
• Contribute to architectural decisions and security standards

REQUIREMENTS 

• At least 5+ years of experience building distributed systems
• Strong expertise in Java development
• Experience designing API platforms or API gateways
• Solid background in security architecture and system design
• Experience with authorization systems (RBAC/ABAC or similar)
• Familiarity with cloud-native architectures and scalable, high-availability systems
• Understanding of multi-tenant architectures
• Experience operating complex distributed systems in production
• Strong architectural thinking and problem-solving skills
• Upper-Intermediate or higher English proficiency

WILL BE A PLUS:

• Experience with Identity and Access Management (IAM) systems
• Experience building API gateways or service mesh architectures
• Work on security-critical or compliance-heavy systems
• Knowledge of policy engines (e.g., OPA)
• Experience with large-scale enterprise platforms
• Familiarity with cloud providers (e.g., GCP)
• Experience with data governance, audit, and compliance systems
• Background in regulated or high-security environments

PERSONAL PROFILE

• Proactive and detail-oriented
• Thrives in collaborative environments
• Enjoys solving complex integration challenges
• Comfortable experimenting with new technologies
• Committed to improving data systems

Workload — Full-time
Duration — 4 years
Location — Munich

We are looking for a Senior Java Developer to support the maintenance, further development, modernization, and 3rd-level support of a complex public-sector software landscape in Munich. The applications include an existing Java Fat Client application, a Java web application based on JSF/PrimeFaces, EAI components, and new modules to be developed using a modern reference architecture with Java backend and Vue 3 frontend. The work includes technical design, implementation, unit testing, documentation, defect correction, and knowledge transfer within an integrated DevOps team.

Key Responsibilities
Analyze technical specifications and clarify open questions independently with the customer/team.
Implement changes and extensions in Java-based individual software systems.
Support the gradual modernization and replacement of legacy Fat Client components.
Work on Java web applications, backend services, EAI components, and new reference architecture modules.
Create and maintain unit tests, mainly with JUnit.
Fix defects found during module, integration, user acceptance, and infrastructure testing.
Contribute to system design, technical documentation, architecture documentation, developer handbook, and operational documentation.
Support 3rd-level incident analysis, root cause investigation, workaround definition, and defect resolution.
Participate in code quality improvement, refactoring, and lifecycle management activities.
Work with the customer’s CI/CD and software production environment.
Transfer knowledge to customer-side developers and internal team members.

Required Skills
Minimum 5 years of professional Java development experience.
Strong experience with Java enterprise applications.
Good knowledge of Java 11 and/or Java 21.
Experience with JEE-related standards and frameworks.
Experience with Spring and Hibernate.
Experience with WildFly / JBoss application servers.
Strong unit testing experience with JUnit.
Experience with Oracle databases, SQL, performance analysis, and database-related troubleshooting.
Experience with Maven, Jenkins, Git, Artifactory, and Sonar.
Experience working with existing/legacy software systems developed by another vendor.
Ability to understand large codebases and improve them incrementally.
Good understanding of software quality, refactoring, coding standards, logging, authorization concepts, and maintainability.
Experience writing technical documentation for developers and operations teams.
German language skills for written and spoken customer communication.

Nice To Have
Experience with Java Fat Client applications.
Experience with OpenWebStart / Java WebStart distribution.
Experience with JSF2 and PrimeFaces.
Experience with Vue 3.
Experience with Apache Artemis.
Experience in public-sector projects.
Experience with structured knowledge transfer from previous vendors or legacy teams.
Experience with test automation, functional testing, system testing, or TestLink.
Experience with proprietary or model-driven Java frameworks; TREND/Framework experience would be a strong plus.
Working Model

The work is expected to be mainly on-site in Munich, especially during onboarding and integration into the customer DevOps team. Remote work may become possible later depending on the consultant’s knowledge level and integration into the project.

About Digis

Digis is a European IT company with 200+ specialists delivering complex SaaS products, enterprise solutions, and AI-powered platforms worldwide. We value transparency, stability, and professional growth, creating an environment where engineers can make a real impact.

About the Project

Our client is a European social media platform focused on creating a healthier and more transparent digital experience. The platform gives users full control over the content they see through a chronological, user-driven feed — eliminating manipulative algorithms, intrusive advertising, and AI-generated content.

Built with a strong focus on privacy, digital freedom, and authentic human connections, the platform aims to become a trusted alternative to traditional social networks.

Team: CEO, CTO, 4 Flutter Developers (including 1 engineer from Digis), Designer.

Requirements

• 5+ years of commercial experience with Java (Spring Boot)
• 2+ years of hands-on experience with Kubernetes

• Upper-Intermediate English level or higher

   

Project Advantages

• Small, highly collaborative team
  Limited number of meetings, short stand-ups (not held daily), and direct communication with decision-makers, including the CEO and CTO. This role offers real influence on technical decisions and product improvements.
• Clear ownership and broad technical scope
  This position goes beyond application development. The engineer will own backend and infrastructure-related tasks, working with Java/Kotlin, PostgreSQL, Redis, Kubernetes, Linux VMs, and CI/CD processes to ensure system stability and scalability.

• Early-stage product with proven traction
  The client is a Luxembourg-based social media product launched in 2025. The platform already has 80,000+ registered users and has raised €655K in pre-seed funding from European angel investors.

   

Responsibilities

• Develop and maintain backend services using Java / Spring Boot
• Work with PostgreSQL and Redis in production environments
• Configure and maintain Kubernetes deployments and Linux-based cloud infrastructure
• Build and improve CI/CD pipelines and deployment automation
• Monitor, troubleshoot, and optimize application performance and reliability

• Participate in technical design discussions and implementation decisions

   

We Offer

• 20 paid vacation days per year
• 5 paid sick leave days per year (no medical documents required)
• Personalized development plan with training compensation
• English course reimbursement
• Work equipment provided (laptop / monitor if needed)
• Flat and transparent communication culture
• Opportunity to switch between projects and technologies within Digis
• Full accounting and legal support

About Us
 

We develop and operate an end-to-end platform for car sharing and vehicle rental, currently used by customers in Germany, Austria, and Spain.
 

The platform is fully white-label capable and includes mobile apps, web applications, back-office tools, and integrations with telematics hardware, payment service providers, and KYC providers — all from a single, modular codebase.

The backend is based on Java 17 / Jakarta EE 10 Payara, while the frontend is built with React / React Native.

We are currently in a strategic growth phase and are now looking for an experienced technical leader to help shape the next stage of our development.
 

The Role

As Tech Lead, you will take on a central bridging role between Engineering and company leadership. You will work closely with the CTO, support them operationally, and ensure that the platform keeps pace with the company’s growth — both technically and organisationally.
 

This position is designed for someone who can dive deep into the code while also keeping the bigger picture in mind. You are not afraid of a mature system with history — you see it as an opportunity.

Technical Leadership & Architecture

• Further development and maintenance of the modular Java / Jakarta EE platform, including shared responsibility for architectural decisions
• Implementation of the identified infrastructure improvements: IaC Terraform / CloudFormation, multi-region setup, and disaster recovery plan
• Responsibility for implementing outstanding security measures
• Driving the migration of binary data from MongoDB to S3, as well as further technical debt reduction projects
• Evaluation and further development of the CI/CD pipelines GitLab CI and test coverage

Processes & Team Organization

• Establishment of formal code review processes and consistent planning cycles within the development team
• Close collaboration with the CTO on the gradual handover of engineering and operational responsibilities
• Support in building a product management process aligned with customer requirements
• Mentoring of the junior frontend developer and support for the senior engineers

Operations & Quality

• Shared responsibility for monitoring, alerting, and incident response AWS CloudWatch, Sentry, Crashlytics
• Automation of dependency vulnerability scanning within the CI pipeline
• Technical support for customer projects — from onboarding through to troubleshooting

Must-Have

• Several years of experience in backend development with Java — Jakarta EE / Java EE / Spring — in production systems
• Strong experience with Test-Driven Development (TDD), as well as a strong quality mindset and interest in software craftsmanship
• Proven experience as a Tech Lead or Senior Engineer with team responsibility
• Solid understanding of cloud infrastructure, ideally AWS — EC2, ECS, CloudWatch, S3
• Experience with MongoDB or comparable NoSQL databases in production environments
• Familiarity with CI/CD pipelines — GitLab CI, GitHub Actions, or similar — and modern deployment practices
• Hands-on mentality: you can deliver value immediately without requiring months of onboarding

Nice-to-Have

• Knowledge of Infrastructure as Code — Terraform or CloudFormation
• Experience with React and/or React Native on the frontend
• Understanding of the mobility, car-sharing, or vehicle rental domains
• Experience in regulated environments or with GDPR compliance projects
• Knowledge of telematics hardware integrations or IoT-related systems
• Class B driving licence

What We Offer

• One of the most technically impressive small platforms in the German mobility landscape — with real responsibility from day one
• Short decision-making paths and a high degree of freedom to shape things
• A well-established team with 5–10 years of shared platform history
• A modern tech stack: Java 17, Jakarta EE 10, React, React Native, GitLab CI/CD — without legacy burden
• 99.9% uptime — efficiency here is not an ambition, but a reality
• Hybrid working with an office in Berlin and flexible working hours
• Competitive salary, depending on experience and qualifications
• Active involvement in the strategic development of the company

How to Apply

We look forward to receiving your application — preferably including a short cover note, your CV, and, where relevant, references or GitHub projects.

A formal cover letter is not required; we value genuine interest and technical depth more than formalities.
 

We are looking for a motivated Junior+ Java Backend Engineer to join our team and work on a modern microservices-based, event-driven platform running in a cloud environment.
The ideal candidate should have solid Java fundamentals, basic backend development experience, and a strong willingness to learn distributed systems and enterprise-level architecture.

Requirements
Strong knowledge of Java
– Commercial or pet-project experience with Java 17+ (preferably Java 21+)
– Good understanding of OOP, Collections, Multithreading, Exception Handling, Streams API
Backend Development
– Experience building REST APIs using Spring Framework or Spring Boot
– Understanding of Dependency Injection, configuration management, and application lifecycle
– Basic understanding of asynchronous programming concepts
Databases
– Good SQL knowledge and hands-on experience with PostgreSQL or similar relational databases
– Understanding of ORM frameworks (JPA / Hibernate or similar ORM tools)
– Basic understanding of transactions, indexing, and query optimization
Messaging Systems
– Basic understanding of event-driven architecture
– Familiarity with Apache Kafka or other message brokers is a strong plus
– Understanding of asynchronous communication between services

– Understanding of synchronous and asynchronous service-to-service communication

– Basic understanding of Protocol Buffers (Protobuf)

API Development
– Experience working with REST APIs
– Understanding of HTTP protocol, status codes, request lifecycle
– Familiarity with OpenAPI Swagger documentation

Infrastructure & DevOps Basics
– Basic experience with Docker
– Understanding of CI/CD concepts
– Familiarity with GitHub Actions or similar pipelines is a plus
Caching
– Basic understanding of caching principles
– Experience with Redis is a plus
Cloud Platforms
– Basic understanding of cloud infrastructure concepts
– Familiarity with Google Cloud Platform (GCP) is a plus
Architecture Knowledge
– Understanding of Microservices Architecture
– Basic knowledge of distributed systems concepts
– Understanding of event-driven communication patterns
 

General Engineering Skills
– Experience with Git and Maven build system
– Ability to debug backend applications
– Understanding of software development lifecycle
– Good problem-solving skills and willingness to learn complex enterprise systems
 

Nice to Have
– Basic knowledge of Netty
– Experience with API documentation tools (Swagger / Scalar)
– Understanding of monitoring tools such as Micrometer
– Exposure to cloud secret management systems
– Understanding of service discovery concepts
 

We expect
– 1–2 years of commercial experience (or strong internship/pet projects)
– Ability to work independently on small backend tasks
– Strong learning mindset and willingness to work with distributed systems
– Desire to grow toward Middle Java Engineer level

We are looking for a Senior Backend Engineer (Java) for our partner, a growing software company based in Spain.

Our partner combines product development with client-facing engineering work. They build their own products in the search and AI space while also delivering software solutions for enterprise customers. As part of an international engineering team, you will work on the backend of a live production platform used by real customers and play a key role in the evolution of its architecture.

This is a full-time remote contract position with an initial commitment of at least six months and the possibility of long-term extension.

Responsibilities

* Design, develop, and maintain backend services and APIs using Java and Spring Boot.

* Participate in a major platform migration toward a more secure and modern architecture.

* Contribute to architectural and technical design decisions.

* Transform business requirements into scalable technical solutions.

* Improve and refactor existing systems while maintaining production stability.

* Collaborate closely with QA and cross-functional teams throughout the development lifecycle.

* Participate in Agile ceremonies and planning activities.

* Utilize AI-assisted development tools where they provide measurable value.

Requirements

Technical Skills

* 5+ years of professional software engineering experience.

* Strong hands-on experience with Java and Spring Boot.

* Proven experience building and maintaining production-grade APIs and backend systems.

* Solid understanding of software architecture, system design, and data modeling.

* Experience working on live products with real production workloads.

* Practical experience using AI coding assistants and developer productivity tools.

Communication

* English level B2 or higher.

* Ability to communicate technical concepts clearly to both technical and non-technical stakeholders.

* Strong written communication and documentation skills.

* Comfortable working within distributed international teams.

Personal Qualities

* Strong ownership mentality and proactive approach.

* Ability to identify issues early and drive solutions independently.

* Open-minded and adaptable when evaluating technologies and approaches.

* Focus on code quality, maintainability, and long-term sustainability.

* Collaborative attitude and strong teamwork skills.

Engagement Details

* Fully remote.

* Full-time contract position.

* Initial engagement of at least 6 months.

* Potential extension based on project needs and performance.

If you are interested, please send your CV and we will be happy to provide additional information about the project and interview process.

We are looking for a Senior Backend Software Engineer to join a fast-growing, well-funded technology startup operating at the intersection of Web3, cybersecurity, and artificial intelligence.

Our client is building a real-time security platform that helps protect digital assets by identifying and preventing threats before they occur. The platform processes massive volumes of blockchain and security-related data in real time, leveraging advanced analytics, AI, and large-scale distributed systems.

This is an opportunity to join a high-impact engineering team working on technically challenging problems in one of the fastest-growing sectors of the technology industry.

As a Senior Backend Software Engineer, you will be part of a team responsible for transforming blockchain data into actionable security insights. You will design, build, and scale backend services that process large volumes of real-time events, power detection engines, and help customers identify threats before financial damage occurs.

Requirements

• 5+ years of software engineering experience
• Strong experience with Python and/or Java
• Proven hands-on experience with Web3, blockchain infrastructure, DeFi protocols, or crypto products
• Deep understanding of blockchain concepts, transactions, smart contracts, wallets, and on-chain data
• Experience designing and building backend services in production environments
• Experience working with cloud platforms (AWS preferred)
• Experience with SQL databases (PostgreSQL is a strong advantage)
• Experience working with distributed systems, event-driven architectures, or large-scale data processing
• Familiarity with CI/CD methodologies and related tools
• Strong understanding of software engineering best practices, testing, and code quality
• Experience with Git workflows
• Excellent communication skills and ability to thrive in a collaborative environment

Nice to Have

• Experience with blockchain indexing, transaction monitoring, or blockchain analytics platforms
• Experience with cybersecurity, fraud detection, risk analysis, monitoring, or threat intelligence products
• Experience processing real-time streams of data or high-volume event pipelines
• Experience working in startups and fast-paced product environments
• Experience using AI-powered development tools to improve productivity and software quality

Why this role exists:

This role exists to design, build, and maintain streaming data solutions based on Apache Kafka and related technologies, ensuring reliable data processing, integration, and testing of streaming applications.

What you’ll drive:

Streaming pipelines & data flow

• Build and maintain data pipelines using Apache Kafka, including topics, partitions, and consumer group tuning.
• Implement and manage Kafka Connect source and sink connectors for integrations.

Streaming application development

• Design and develop stateful streaming applications using Kafka Streams or Flink with Java (and Scala where applicable).
• Ensure data consistency and schema evolution using Schema Registry (Avro).

Quality & testing

• Write and maintain unit and integration tests for streaming topologies.

What makes you a GR8 fit:

Must-have

• 3+ years of experience in back end.
• Commercial experience in software engineering with strong proficiency in Java (Scala is a plus).
• Understanding of Apache Kafka architecture and internals.
• Experience working with Apache Flink.
• Experience with Schema Registry and schema evolution strategies.
• Knowledge of serialization formats such as Avro and JSON.
• Experience using SQL for processing large datasets.
• Upper-intermediate or higher level of English.

Nice-to-have

• Experience running Kafka and/or Flink on Kubernetes.
• Familiarity with monitoring tools such as Prometheus and Grafana for streaming metrics.
• Understanding of stream processing semantics.
• Experience with CI/CD pipelines for streaming applications.

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment

TJHelpers is committed to developing strong engineering teams through mentorship, real project experience, and our “Helpers as a Service” model. We provide structured growth, hands-on practice, and a supportive environment where engineers can evolve quickly and meaningfully.

We are looking for a Java Developer to join our backend team in our Odesa office, located in the Primorskyi District.

You will contribute to building scalable, high-performance, and reliable microservices for modern products across fintech, AI, telecom, healthcare, and other high-load domains.

Responsibilities

• Design, develop, and maintain scalable backend microservices and APIs.
• Write clean, efficient, and well-tested code using Java (17/21) and Spring Boot.
• Work with event-driven architectures using tools like Kafka or RabbitMQ.
• Integrate with internal and external REST/GraphQL services.
• Collaborate closely with DevOps, QA, and product teams to deliver high-quality features.
• Participate in code reviews and help establish engineering best practices.
• Optimize backend systems for performance, reliability, and cost efficiency.

• Investigate and resolve production issues, contributing to CI/CD and observability improvements.

   

Requirements

• Strong knowledge of Java and hands-on experience with Spring Boot / Spring Cloud.
• Experience building REST APIs, microservices, and integrations.
• Solid understanding of relational databases (PostgreSQL/MySQL) and ORM frameworks (Hibernate/JPA).
• Familiarity with Docker, containerization, and CI/CD pipelines.
• Knowledge of software architecture principles: microservices, event-driven systems, clean architecture.
• Experience with Git, unit testing (JUnit), and debugging/profiling tools.

• Good problem-solving skills and ability to work in a fast-paced environment.

   

Nice to Have

• Experience with cloud platforms (AWS, GCP, Azure).
• Knowledge of Kafka, Redis, Elasticsearch, or GraphQL.
• Experience with Kubernetes, Helm, or Terraform.
• Understanding of caching strategies, messaging patterns, and high-load system design.
• Experience with performance tuning, monitoring (Prometheus/Grafana), and observability tools (ELK).

• Familiarity with ML/AI integrations or data pipelines.

   

We Offer

• Real-world projects in fintech, AI, telecom, and automation industries.
• Mentorship from senior engineers, tech leads, and architects.
• Personal development plan and a clear path toward Senior Java Engineer or Backend Architect roles.
• Access to internal workshops, best practices, and structured feedback.
• A collaborative engineering culture focused on transparency and continuous improvement.
• Long-term projects, flexible schedule, and a remote-friendly work environment.

TJHelpers is committed to developing strong engineering teams through mentorship, real project experience, and our “Helpers as a Service” model. We provide structured growth, hands-on practice, and a supportive environment where engineers can evolve quickly and meaningfully.

We are looking for a Java Developer to join our backend team and contribute to building scalable, high-performance, and reliable microservices for modern products across fintech, AI, telecom, healthcare, and other high-load domains.

Responsibilities

• Design, develop, and maintain scalable backend microservices and APIs.
• Write clean, efficient, and well-tested code using Java (17/21) and Spring Boot.
• Work with event-driven architectures using tools like Kafka or RabbitMQ.
• Integrate with internal and external REST/GraphQL services.
• Collaborate closely with DevOps, QA, and product teams to deliver high-quality features.
• Participate in code reviews and help establish engineering best practices.
• Optimize backend systems for performance, reliability, and cost efficiency.

• Investigate and resolve production issues, contributing to CI/CD and observability improvements.

   

Requirements

• Strong knowledge of Java and hands-on experience with Spring Boot / Spring Cloud.
• Experience building REST APIs, microservices, and integrations.
• Solid understanding of relational databases (PostgreSQL/MySQL) and ORM frameworks (Hibernate/JPA).
• Familiarity with Docker, containerization, and CI/CD pipelines.
• Knowledge of software architecture principles: microservices, event-driven systems, clean architecture.
• Experience with Git, unit testing (JUnit), and debugging/profiling tools.

• Good problem-solving skills and ability to work in a fast-paced environment.

   

Nice to Have

• Experience with cloud platforms (AWS, GCP, Azure).
• Knowledge of Kafka, Redis, Elasticsearch, or GraphQL.
• Experience with Kubernetes, Helm, or Terraform.
• Understanding of caching strategies, messaging patterns, and high-load system design.
• Experience with performance tuning, monitoring (Prometheus/Grafana), and observability tools (ELK).

• Familiarity with ML/AI integrations or data pipelines.

   

We Offer

• Real-world projects in fintech, AI, telecom, and automation industries.
• Mentorship from senior engineers, tech leads, and architects.
• Personal development plan and a clear path toward Senior Java Engineer or Backend Architect roles.
• Access to internal workshops, best practices, and structured feedback.
• A collaborative engineering culture focused on transparency and continuous improvement.
• Long-term projects, flexible schedule, and a remote-friendly work environment.

👨‍💻We invite a Junior/Middle Java or Kotlin Developer to join our team for long-term cooperation. Gransoft develop an international health insurance portal. Our project has become especially important at this time.

▪️Office Location: Uzhhorod or Gdansk

Requirements:

— Strong and confident knowledge of Java or Kotlin, Hibernate, Spring, MySQL

— Experience with any software development 1-5 years

— Experience with Java/Kotlin provides a significant advantage

— An intermediate-level proficiency in English: reading, writing and speaking

— Responsible attitude to the tasks and deadlines

— Work from office only

We offer:

— Interesting and challenging project

— Creative and friendly atmosphere

— Our company policy is to welcome your ideas and suggestions

— An international team of experienced Java/Kotlin developers

— Paid vacations and days off during national holidays

— Flexible work schedule

— 8-hour workday

— Office in Uzhhorod or Gdansk

— Paid English language courses

— The company provides relocation support and, if needed, assists with the moving process and finding accommodation

More details could be given during an interview.

Please include your Telegram username in CV.

👨‍💻We invite a Junior/Middle Java or Kotlin Developer to join our team for long-term cooperation. Gransoft develop an international health insurance portal. Our project has become especially important at this time.

Office Location: Uzhhorod or Gdańsk.
Please note: This is an on-site position only!
Hybrid and remote work arrangements are not available.

Requirements:

— Strong and confident knowledge of Java or Kotlin, Hibernate, Spring, MySQL

— Experience with any software development 1-5 years

— Experience with Java/Kotlin provides a significant advantage

— An intermediate-level proficiency in English: reading, writing and speaking

— Responsible attitude to the tasks and deadlines

— Work from office only

We offer:

— Interesting and challenging project

— Creative and friendly atmosphere

— Our company policy is to welcome your ideas and suggestions

— An international team of experienced Java/Kotlin developers

— Paid vacations and days off during national holidays

— Flexible work schedule

— 8-hour workday

— Office in Uzhhorod or Gdansk

— Paid English language courses

— The company provides relocation support and, if needed, assists with the moving process and finding accommodation

More details could be given during an interview.

Please include your Telegram username in CV.

The full production cycle IT company Nabuto specializes in the development of software products/services in the field of information technologies.

We operate in the FinTech/trading domain, running a data-intensive platform that processes millions of real-time events. The environment is low-latency, high-load and engineered for continuous availability.

We’re building a high-performance cryptocurrency trading platform and looking for a Strong Middle Java Engineer to help us develop and scale the core backend systems powering real-time trading operations.
You’ll work on latency-sensitive, high-throughput services responsible for processing large volumes of market and trading events in real time. The role requires solid backend engineering fundamentals, attention to performance and reliability, and the ability to work comfortably in distributed systems with demanding uptime requirements.
You’ll be involved in designing and developing microservices, improving system scalability, optimizing data flows, and contributing to the platform’s overall stability. We value engineers who write clean, maintainable code, take ownership of their work, and can operate effectively in a fast-moving engineering environment.
Our stack is heavily focused on Java and modern backend technologies, running in a cloud-native infrastructure with Kubernetes and event-driven architecture patterns.

Responsibilities
• Development and design of a semi-crical microservices.

Requirements
• 5 years of experience as a Java Engineer.
• Experience with Java 18+.
• Computer science fundamentals (algorithms and data structures).
• Spring Boot/Hibernate applications development.
• SQL knowledge.
• Experience with message brokers.
• Leveraging of AI coding assistants (Claude Code, Codex, Amazon Kiro) as part of the daily engineering workflow.
• It would be great to have a hands-on experience with the Hazelcast platform.
• Master’s degree focused on Computer Science or a similar specialization.

Nice to Have
• Experience working with high-load or real-time systems.
• Streaming Technologies (Apache Flink, Hazelcast Platform).
• AWS Cloud.
• Distributed systems fundamentals.
• Kubernetes Fundamentals.

What We Offer
• Work-Life Balance — 24 days of paid vacation + 30 days of paid sick leave.
• Care from Day One — medical insurance from your first day, including dental care, massage, and professional psychological support.
• Knowledge Library — office books and access to the Kuka online library.
• Investment in Your Energy — partial reimbursement for sports and fitness activities.
• Growth & Learning — coverage for English or Ukrainian language courses and a dedicated professional development budget.
• Island Relaxation — up to 14 days per year at the company villa in Cyprus.

Join the Nabuto team, where your talents and aspirations will be recognized!

We offer a dynamic work environment, opportunities for professional growth, and support at every step of your career path. Start your journey to success with us—apply today and take the first step towards your bright future!

Nabuto is an equal opportunity employer. We encourage applications from candidates of all backgrounds and experiences. 

Please note, that only shortlisted candidates will be contacted. Thank you for considering Nabuto as your next career move!

About Us: InnovatelU is a dynamic tech company delivering cutting-edge solutions. We're looking for a passionate Java Developer to join our team. If you have a solid Java foundation, are eager to grow, and learn quickly, we want to hear from you! 

Requirements: 
- Strong knowledge of Java 
- Knowledge of Spring (Spring Core, Spring AOP, Spring MVC, Spring Security, Spring Boot) 
- Familiarity with REST APIs, web services 
- Proficiency in version control tools (Git) 
- Experience with build tools like Maven and Gradle 
- Experience with relational databases (PostgreSQL) 
- Expertise in containerization (Docker) 

- Experience in unit and integration testing 
- Strong communication skills and teamwork ability 
- English level: Intermediate or higher 

Will Be a Plus: 

- Solid understanding of design patterns 

- Experience with NoSQL databases like MongoDB and Redis 

- Familiarity with messaging systems like Kafka and RabbitMQ 

- Experience with microservices architecture 

Responsibilities: 

- Collaborate with senior developers and project managers 

- Assist in designing, coding, and testing applications 

- Write well-designed, efficient, and testable code 

- Participate in code reviews 

- Debug and resolve technical issues 

- Contribute to application documentation 

Interview Stages: 

1. Test Task: 1 hour 

2. HR Interview: 30 minutes 

3. Technical Interview: 1 hour 

We Offer: 

- Full Remote 

- Constant support and mentoring 

- Paid 5 working days of sickness per a year; 

- Paid all official Ukrainian holidays; 

- 18 working days of vacation per a year; 

- Opportunity for professional growth and career development 

If this sounds interesting to you, let's talk!