Jobs Java

Head / Lead Java Engineer (igaming)

We are looking for a Head / Lead Java Engineer to lead the development of our high-load platform while remaining deeply involved in engineering and architecture decisions.

This role combines technical leadership, hands-on software development, and team management. You will be responsible for designing and evolving highly loaded microservices, driving architectural decisions, ensuring system scalability and reliability, and building strong engineering practices across the team.

You will work with modern cloud-native technologies and a diverse data ecosystem while helping the business scale through reliable, cost-efficient, and resilient technical solutions.

What You’ll Own

— Design, develop, and improve a system of highly loaded microservices and distributed service
— Write production code and actively contribute to technical implementation
— Drive architecture decisions around scalability, reliability, performance, and cost-efficiency
— Ensure low-latency and high-throughput system performance across critical business services
— Select and evolve data storage solutions based on workload requirements, balancing relational databases, NoSQL stores, caching, and streaming technologies
— Own platform observability, monitoring, metrics, logging, and alerting practices
— Ensure effective deployment strategies, release processes, and meaningful test coverage
— Build reliable event-driven architectures using Kafka and microservice design principles
— Lead and grow the engineering team through hiring, mentoring, code reviews, and regular 1:1s
— Establish engineering standards, ownership models, on-call processes, and delivery practices
— Represent the team in cross-functional discussions and help align technical initiatives with business goals

What We’re Looking For

— 10+ years of Java development experience
— 5+ years in a Technical Lead role
— Strong experience building and operating low-latency, high-throughput production systems
— Expert knowledge of Spring Boot, Spring Data, and Hibernate
— Deep understanding of multithreading, concurrency, and non-blocking I/O
— Strong experience with both SQL and NoSQL databases and a practical understanding of their trade-offs
— Production-grade AWS architecture experience
— Experience with Docker, Kubernetes, and cloud-native applications
— Strong understanding of event-driven architecture and Kafka
— Experience designing and maintaining REST and GraphQL APIs

— Hands-on experience with Grafana, Prometheus, and ELK
— Upper-Intermediate English or higher

Nice to Have

— Experience in iGaming, fintech, payments, or another highly regulated domain
— Experience building multi-region architectures
— Strong understanding of backup, disaster recovery, and resilience strategies
— Experience operating PostgreSQL, DynamoDB, Redis, Cassandra, ClickHouse, and streaming platforms in production environments.

We Offer:

— 20 vacation days + 36 paid sick leaves per year.
— Flexible schedule with no micromanagement.
— Fully remote work environment.
— Opportunity to work on an international product serving multiple markets.
— Professional development and support in growing QA expertise.
— Opportunity to develop automation testing skills.
— International team with transparent communication and fast decision-making.
— Long-term cooperation and career growth opportunities.

Selection Stages:

1. Call with Recruiter
2. Technical Interview
3. Final Interview
4. Job Offer

Join us and help deliver high-quality products used by thousands of users worldwide! 🚀

About Flamingo

Flamingo is revolutionizing the Managed Service Provider (MSP) industry with an AI-driven, open-source platform for IT and security. Our goal is to empower MSPs with automation, optimization, and scalability tools to enhance their operations. 

Role Overview

As a Senior Back-end Engineer (Java) at Flamingo, you will design and develop scalable, high-performance back-end services and APIs using Java and Spring Boot. You will be responsible for implementing event-driven microservices, optimizing system performance, and ensuring high availability as we scale our platform. Your expertise in processing high-volume logs and integrating multiple data sources will be critical to building a robust and efficient system.

Key Responsibilities

• Design and develop scalable backend services and APIs using Java (Spring Boot).
• Architect and implement event-driven microservices with Kafka and RabbitMQ.
• Process and analyze high-volume logs efficiently to ensure scalability and real-time insights.
• Integrate and manage multiple data sources, including SQL, NoSQL, and streaming data.
• Optimize database performance using PostgreSQL, Redis, and Elasticsearch.
• Implement authentication and authorization mechanisms with OAuth, JWT, and Keycloak.
• Collaborate with front-end and DevOps teams to build a seamless and resilient system.
• Ensure code quality through automated testing, CI/CD pipelines, and best engineering practices.

Qualifications

Must-Have:

• 5+ years of experience in backend development with Java and Spring Boot.
• Experience in microservices architecture, including event-driven systems (Kafka, RabbitMQ).
• Strong knowledge of RESTful APIs, GraphQL, and WebSockets.
• Experience processing high-volume logs and working with log management tools (ELK stack, Loki, Fluentd, OpenTelemetry).
• Experience working with multiple data sources, including relational (PostgreSQL) and non-relational (Redis, Elasticsearch) databases
• Experience with containerization (Docker, Kubernetes) and cloud platforms (AWS/GCP).
• Understanding of security best practices in backend development.

Nice-to-Have:

• Experience with functional programming in Java or Scala.
• Familiarity with distributed tracing (e.g., Jaeger, Zipkin) for microservices.
• Knowledge of cloud-native architectures and serverless frameworks.
• Exposure to message queues and event sourcing.

Why Join Flamingo?

• High-impact role: As a back-end engineer, your contributions will directly shape Flamingo’s product and technology.
• Ownership & Equity: Competitive compensation, including significant equity in an early-stage, high-growth startup.
• Innovative Tech Stack: Work with cutting-edge open-source technologies in AI, automation, and security.
• Remote-first Culture: Flexibility to work from anywhere while collaborating with a top-tier team.
• Mission-Driven Company: Join a team passionate about disrupting the MSP industry and making enterprise-grade security and IT automation accessible to all.

About the Project

AI Interview Platform (client name undisclosed) — a leading technical interviewing platform used by fast-growing startups and large enterprises worldwide. It pairs experienced engineers with standardized interview frameworks to enable fair, high-signal, and scalable hiring for software engineers globally.

What You'll Do

• Conduct live technical interviews with software engineering candidates worldwide via the platform.
• Assess coding skills, problem-solving abilities, technical knowledge, and communication while creating a professional and inclusive candidate experience.
• Provide structured, objective feedback based on established evaluation criteria to reduce bias and improve hiring quality.
• Collaborate with the client’s team to test, refine, and improve interview content, processes, and platform features.

Must Have

• 4+ years of professional experience as a Software Engineer/Developer.
• Strong Java proficiency + working knowledge of frontend technologies (JavaScript, React, or similar).
• Solid understanding of algorithms, data structures, and software engineering fundamentals.
• Excellent English communication skills (spoken and written).
• Professional demeanor, ability to deliver objective assessments, and reliable setup (webcam, microphone, stable internet).

Nice to Have

• Prior experience conducting technical interviews (DS&A, system design).
• Mentoring, coaching, or technical leadership experience.
• Interest in talent assessment, interviewing best practices, or inclusive hiring.

Location: EU / Remote (Ukraine)

Type: Freelance full-time (first 3 months), with option to go part-time later.

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 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

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.

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!

Sagax Software - це продуктова IT-компанія, що створює сучасні рішення для автоматизації страхового бізнесу. Ми розробляємо комплексну платформу для страхових компаній, яка автоматизує всі аспекти їхньої діяльності. 

Що ми пропонуємо: 

• Робота над продуктом, який змінює ринок. Ви будете частиною масштабної платформи, яка допомагає страховикам підкорювати нові вершини бізнесу. 
• Актуальний технологічний стек. Ми слідуємо тенденціям у світі технологій і використовуємо сучасні інструменти для створення якісних рішень. 
• Стабільність і можливість професійного розвитку. Ми пропонуємо стабільну роботу в команді, яка активно розвивається, і надаємо можливості для професійного росту через навчання, обмін досвідом та участь у цікавих проєктах. 
• Турбота про ваше здоров’я. Програми страхування здоров’я та життя, оплачувані відпустки й лікарняні забезпечать вашу впевненість у завтрашньому дні. 

• Зручний формат роботи. Обирайте між віддаленою роботою або офісом у центрі Києва, БЦ "Гулівер" (поруч зі ст. метро Палац спорту). Ви маєте можливість працювати з будь-якого місця України і не тільки.   

   

Зараз ми шукаємо Java Team Lead в команду, яка відповідає за розвиток одного з ключових модулів нашої платформи — сучасної CRM-системи для управління продажами страхових договорів. 

Наш процес найму включає: ознайомчий дзвінок, співбесіду з рекрутером, технічну співбесіду і знайомство з HRD та Team Lead. Усі 4 етапи займають разом орієнтовно 4 години

Ваша команда це: Ви, 6 Java Dev, 4 BA, Рroduct Owner 

Наш основний стек:  

• Backend: Java (Core, JVM), Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security) 
• Databases: PosgreSQL 

• Other technologies: Hibеrnate, Мікросервісна архітектура, REST API, Docker, CI/CD,  RabbitMQ 

   

Ваші основні задачі: 

• Технічне керівництво командою Java-розробників: розподіл завдань
• Проєктування та розвиток мікросервісної архітектури команди: прийняття архітектурних рішень, робота з Spring Boot, REST API, Kafka
• Взаємодія із клієнтом та суміжними командами: участь у технічних обговореннях, збір вимог, оцінка задач та управління технічним боргом
• Менторство та розвиток команди: проведення 1:1 зустрічей, постановка цілей розвитку (IDP), участь у hiring-процесі (технічні інтерв'ю)
• Участь у розробці: написання складних модулів, підтримка кодової бази, дотримання best practices (SOLID, Clean Code, Design Patterns) та впровадження технічних стандартів команди
• Звітність перед PO та участь статус-мітингах із клієнтом щодо прогресу, ризиків та пріоритетів

Що ми очікуємо:    

• Досвід роботи на позиції Team Lead від 1 року 
• Досвід роботи з Java (Core, JVM) від 3 років 
• Досвід роботи з Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security) від 3 років 
• Досвід роботи з ORM та базами даних (Hibernate, SQL, Redis) 
• Досвід роботи з RabbitMQ, REST API 
• Досвід роботи з інфраструктурою та моніторингом (Docker, ELK) 
• Досвід роботи з мікросервісною архітектурою 
   

Буде плюсом: 

• Досвід роботи з інфраструктурою та стримінгом (Kafka, CI/CD) 
• Досвід роботи з NoSQL 
• Досвід роботи з Jira або аналогічними тікетними системами 

Про проект: 
CRM-модуль — це ключова складова нашої платформи для автоматизації страхового бізнесу. Він створений, щоб допомогти страховим компаніям керувати продажами швидше та ефективніше, автоматизувати рутинні процеси та забезпечити зростання їхнього бізнесу. 

Основні задачі вашої команди: 

• Оптимізація та розвиток CRM-системи, зокрема інтеграція із зовнішніми сервісами та платформами 
• Розробка нових функцій та модулів CRM-системи та веб-сайту 
• Участь у міграції окремих компонентів на сучасні технології та підвищення загальної продуктивності системи. 
   

Будемо раді розглянути ваше резюме у відгуках на цю вакансію! 

Ми шукаємо Algorithm and Optimization Engineering на проєкт із Німеччини.

Продукт — це міжнародна платформа для замовлення їжі та товарів. Компанія на ринку з 2011 року та представлена приблизно у 70 країнах.

Платформа об'єднує кілька продуктів: B2B-рішення для ресторанів і магазинів, що допомагає керувати замовленнями, аналізувати бізнес-показники та залучати нових клієнтів; B2C-платформу для користувачів, через яку можна замовляти їжу, продукти й інші товари, відстежувати доставку в реальному часі та оплачувати замовлення онлайн; а також окрему платформу для кур'єрів, яка відповідає за навігацію, побудову оптимальних маршрутів і ефективну доставку.

Для нас це новий клієнт, і зараз ми шукаємо Algorithm and Optimization Engineering, в команду, яка розвиває платформу для кур'єрів.  На цій позиції ви працюватимете над розвитком routing-інфраструктури на базі OpenStreetMap, оптимізацією алгоритмів маршрутизації, покращенням точності ETA, аналізом логістичних KPI та масштабуванням routing-сервісів для роботи під високим навантаженням.

Вимоги:

• 5+ років досвіду як Backend Engineer (Python/Java/Go)
• OpenStreetMap
• OSRM/GraphHopper/Valhalla 
• Vehicle Routing Problem (VRP)/Operations Research
• Досвід використання симуляцій як основного методу валідації
• Досвід роботи з графовими алгоритмами, комбінаторною оптимізацією та евристичними підходами 
• Англійська Upper-Intermediate та вище

Буде плюсом:

• Досвід роботи з логістичними, delivery або транспортними платформами, глибоке розуміння маршрутизації для різних видів транспорту: пішохідний, велосипедний, автомобільний
• Досвід з high-load розподіленими та real-time системами 
• Комфорт у роботі в R&D-середовищі з високим відсотком відхилених гіпотез
• Досвід аналізу логістичних/операційних метрик (delivery time, cost per order, utilization rate) та розуміння логістичних KPI: Cost Per Order (CPO), courier utilization, contact rate
• Досвід тюнінгу алгоритмів для різних географічних ринків (LATAM, Європа, Азія)
• Досвід оптимізації ETA та моделювання невизначеності
• Знання fleet management та динамічного планування потужностей
• Математична освіта або досвід тісної співпраці з математиками/optimization researchers
• Kubernetes
• AWS

Стек технологій:

• Python, Java або Go
• OpenStreetMap
• OSRM / GraphHopper / Valhalla
• Graph Algorithms
• Vehicle Routing Problem (VRP)
• Operations Research
• Simulation-based validation

Обов’язки:

• Проєктувати, реалізовувати та валідувати покращення алгоритмів маршрутизації кур'єрів через симуляційне тестування
• Оптимізовувати routing-сервіси на базі OpenStreetMap для продуктивності під високим та змінним навантаженням
• Пропонувати та тестувати оптимізаційні гіпотези на реальних ринкових даних та вимірювати вплив на продакшн через логістичні KPI (Delivery Time, Cost Per Order, courier utilization)
• Працювати над route balancing, elasticity-системами та управлінням бізнес-обмеженнями
• Співпрацювати з командами над R&D-ініціативами
• Аналізувати операційні та performance-метрики для виявлення можливостей оптимізації
• Долучатись до покращення ефективності інфраструктури для routing-сервісів
• Брати участь у cross-market тестуванні алгоритмів — валідувати роботу рішень на різних географіях (LATAM, Європа, Азія)
• Покращувати точність розрахунку ETA та моделі оцінки

Ми пропонуємо:

• 18 днів оплачуваної відпустки, 10 днів оплачуваних лікарняних
• Можливість брати додаткові вихідні власним коштом
• Компенсацію курсів та сертифікації
• Уроки англійської мови
• Доступ до бібліотеки компанії
• Медичне страхування або компенсація за спорт
• Гнучкий робочий графік і можливість працювати з дому
• Фінансову компенсацію за візит до пункту здачі крові
• Мінімальну кількість бюрократії

Можна працювати в офісі: 

• Львів: Гайдамацька 9a
• Київ: Проспект Берестейський 24 

Або повністю віддалено 

Привіт!
 

Ми в UpUp шукаємо Backend Developer (Middle / Middle+) у команду, яка працює з американською продуктовою компанією, яка понад 8 років створює рішення для малого ритейлу в США — POS-системи, платіжні інтеграції, аналітику, loyalty-інструменти, репортинг, дискаунти та інше.

Ми шукаємо розробника, який готовий брати відповідальність за частини системи, занурюватися в продукт і разом з командою рухати його вперед.

У нас невелика інженерна команда, тому розробники беруть участь не тільки в реалізації задач, а й у технічних рішеннях, архітектурі та плануванні нових фіч.

Що ти будеш робити

• Розробляти та підтримувати backend-сервіси на Spring Boot (Java / Kotlin)
• Проєктувати та розвивати REST API для web та mobile застосунків
• Працювати з PostgreSQL / MySQL: проєктування схем, оптимізація запитів
• Брати участь у технічному дизайні фіч та архітектурних обговореннях
• Інтегрувати backend з frontend та mobile застосунками
• Працювати з інфраструктурою в AWS разом з DevOps командою
• Брати відповідальність за окремі модулі або сервіси системи
• Покращувати стабільність, продуктивність та архітектуру бекенду

Що ми очікуємо

• 3+ роки комерційного досвіду у backend-розробці
• Впевнене знання Java та Kotlin
• Досвід роботи з Spring Boot
• Хороший досвід роботи з SQL базами даних (PostgreSQL / MySQL)
• Розуміння принципів побудови REST API
• Досвід роботи з AI
• Вміння самостійно розбиратися в задачах і доводити їх до результату


Важливо для нас

• відповідальність за свою роботу і результат
• бажання занурюватися в продукт, а не тільки виконувати задачі
• вміння пропонувати технічні рішення
• комфортна робота в команді та технічних обговореннях

Буде плюсом

• Базове розуміння або досвід роботи з frontend чи mobile технологіями (React, Angular, Android)
• Досвід роботи з POS або payment-related системами

Формат роботи

• віддалена робота
• робота з реальними продуктами для ринку США
• невелика команда, швидкі рішення, мінімум бюрократії
 

Якщо тобі цікаво працювати з продуктовими системами, брати відповідальність за частини бекенду і впливати на розвиток продукту — надсилай резюме, будемо раді познайомитися.