Jobs Java

Senior Java Engineer (high-load product) 

Are you a Java Developer looking for new challenges? 
What about working with a high-profile client with millions of QPS? 
If you have experience developing high-performance distributed systems, this is the perfect opportunity to work on a new digital marketing management platform with a world-renowned client.
 
Project tech stack: 
Concurrency -  a high-load, low-latency system.
Cache: Aerospike, Memcached
Cloud: AWS, GCP
DB: PostgreSQL, Superset
Streams: Kafka, Kinesis
Data formats: Avro, Protobuf
Languages: Java, Scala, Python
 
About the project:
Our client is a leading streaming service based in the United States. With millions of users worldwide, its devices provide easy access to free TV, live news, sports, movies, etc. The client has an advertising business and also licenses its hardware and software to other companies.
 
Location:
Ukraine remote
 
Skills & Experience:
- 4 - 8 years of experience building large-scale and low-latency distributed systems
- B.S. or M.S. degree in Computer Science, Engineering, or equivalent 
- Command of Java or C++
- Solid understanding of algorithms, data structures, performance optimization techniques, object-oriented programming, multi-threading, and real-time programming 
-Self-motivated individual with a high level of accountability and ownership
- Critical thinking and practical decision making
- Can do, results-oriented mindset
 
Will be a plus: 
- Experience with distributed caching, SQL/NoSQL, and other databases is a plus 
- Experience with Big Data and cloud services such as AWS/GCP is a plus
Experience in the advertising domain is a big plus 

 Responsibilities
- Work alongside a highly skilled engineering team to design, develop, and maintain large-scale, highly performing, real-time applications
- Own building features, driving directly with product and other engineering teams 
- Demonstrate excellent communication skills in working with technical and non-technical audiences 
- Be an evangelist for best practices across all functions – developers, QA, and infrastructure/ops 
- Be an evangelist for platform innovation and reuse 
- Deliver top-quality software in a timely fashion 

 

The Mission

Wallee Group is a leader in advanced payment solutions, dedicated to providing robust, scalable, and secure systems across multiple domains. We enhance customer experiences through innovative payment and finance technology that empowers businesses to grow efficiently. With operations spanning several countries, we thrive on collaboration and agility, utilizing the Scrum framework to drive our international teams. At Wallee, we stay at the forefront of market trends, continuously innovating to deliver premier services to our global customers.

The Role

To achieve our mission of providing the market's best payment experience, Wallee is seeking experienced and versatile java software engineers for our Vilnius office. As disruptors in the payment space, we build industry-leading systems that demand the highest standards of security and reliability. We are constantly pushing our solutions into new territories, and we are looking for engineers who thrive in a fast-paced, agile environment to help us redefine the future of finance.

Tasks

Your Impact

• Architect Scalability: Design and develop highly resilient back-end systems using Java, ensuring our infrastructure handles global scale with ease.
• Feature Innovation: Own the end-to-end lifecycle of new features, from initial implementation to refined bug fixing and performance tuning.
• Collaborative Engineering: Work closely with product managers, UX designers, and QA to translate complex business needs into elegant technical solutions.
• Code Excellence: Drive quality through automated testing, rigorous code reviews, and the creation of clear, maintainable technical documentation.
• Stay Ahead: Continuously research and evaluate emerging technologies and methodologies to keep Wallee at the cutting edge of the fintech industry.

Requirements

What You Bring to the Table

• Technical Depth: Advanced proficiency in Java and core frameworks such as Spring, Spring Boot, and Hibernate.
• Systems Thinking: Proven experience building distributed systems and scalable, high-availability solutions.
• Data Mastery: Strong proficiency in SQL and experience managing complex data structures.
• Modern DevOps: Hands-on experience with CI/CD pipelines (Jenkins/GitLab CI) and containerization (Docker, AWS ECS).
• Agile Mindset: A degree in Computer Science (or equivalent experience) and a track record of thriving in fast-paced, Agile environments.

• Bonus Points: Experience with JavaScript, Apache Camel, or BPM engines.

   

  Benefits:

• You are part of an agile, young international team and shape our products sustainably with your ideas.
• You will play a decisive role in designing products in an omni channel payment start-up and work with leading companies in the financial industry on international projects.
• We offer flexible structures and flat hierarchies.
• Cooperation with motivated colleagues and numerous personal development opportunities.

Project description

One of the world's largest providers of products and services to the energy industry has a need to develop and support enterprise information system in Oil & Gas domain.
Product being developed is a cloud solution for interpretation of geological and geophysical data. Project is based on SCRUM methodology.
Our project is stable, long-term and constantly adopts new technologies such as newest Java and Eclipse RCP versions, cloud and GPU computing, microservices architecture and other innovative frameworks.
Work supposes close cooperation with Customer team located in Houston and following Agile principles.
Our team is senior, supportive and friendly.

Responsibilities

Collaborate closely with geophysicists, data scientists, and software engineers to translate scientific domain requirements into robust on-prem or Cloud software

solutions.

Design, develop, and maintain high-performance applications for geophysical and geological data analysis, interpretation and visualization (e.g., seismic, horizon,

fault, velocity model, etc.)

Present architectural designs and technical proposals to the architecture review board.

Ability to break down development tasks and lay out clear implementation roadmaps.

Implement and optimize computation algorithms

Design and develop both thin and thick client applications that interact with cloud-based microservices.

Ensure high code quality through unit testing, code reviews, security hardening and continuous integration with other domain tools

Provide technical support and lead user troubleshooting sessions to resolve issues and ensure smooth operation of DSG application.

Mentor junior developers and actively contribute to architectural and implementation decisions.

Embrace Agile/Scrum methodologies, delivering and demonstrating working solutions at the end of each sprint

Stay current with emerging technologies and trends in geophysical computing and software development.

Skills

Must have

6+ years of hands-on Java development experience

Strong Java Core knowledge

Experience with desktop development frameworks: Swing, SWT, or Eclipse RCP

Proven experience designing and building complex systems end-to-end, not just maintaining or extending existing ones

Practical understanding of multithreaded programming: ability to implement concurrency in code directly, not only through third-party libraries

Solid knowledge of design patterns and software architecture principles

Ability to clearly articulate past projects, personal responsibilities, and concrete individual contributions

Experience working in non-microservices, non-cloud-native development environments (desktop, embedded, or domain-specific platforms)

Stable career trajectory, no fragmented job history with short tenures

Nice to have

C++ development skills

Practical experience with the Eclipse RCP framework

OSGi knowledge

Oil & Gas domain experience

Languages

English: B2 Upper Intermediate

Work according to the Azerbaijan public holiday calendar. 

Work from the client's office in Baku. 

Willingness to undertake a long-term business trip at the client's expense for 6+ months (including flight tickets, accommodation, and per diem expenses). 

Project Responsibilities 

Design, develop, and maintain backend services for banking and financial products. 

Develop scalable microservices and integration solutions. Design and implement REST APIs and asynchronous integrations. 

Work with Oracle and PostgreSQL databases, including performance optimization. Implement event-driven solutions using Kafka and RabbitMQ. 

Participate in architecture discussions, code reviews, and technical design activities. 

Support production environments and troubleshoot complex issues.

Collaborate with analysts, architects, QA, and DevOps teams throughout the SDLC.

Must-haves 

5+ years of backend development experience. 

Experience in banking, fintech, payments, or financial services. 

Strong proficiency in Java (Java 11/17+) and Spring Boot. 

Experience with microservice architecture. 

Strong experience with Oracle and PostgreSQL. 

Hands-on experience with Apache Kafka and RabbitMQ. 

Experience designing and developing REST APIs. 

Understanding of distributed systems and event-driven architectures.

Strong SQL skills and database performance optimization experience. Experience with Git and CI/CD pipelines. 

Understanding of software design patterns and clean code principles. Experience working in Agile/Scrum environments. 

Nice-to-have 

Experience with Kotlin or Go. 

Docker and Kubernetes/OpenShift. 

Experience with monitoring and logging solutions (ELK, Grafana, Prometheus). 

Experience with high-load and mission-critical systems. 

Knowledge of payment processing, transaction management, card systems, or financial integrations.
 

🔹Who we are!
At Levi9, we are passionate about what we do. We love our work and together in a team, we are smarter and stronger. We are looking for skilled team players who make change happen. Are you one of these players?

🔹About the project
Our client is a leading media company in Western Europe, delivering high-quality content across various platforms, including newspapers, magazines, radio, TV, websites, apps, and podcasts. Their brands reach millions of people daily, shaping the media landscape with independent and trusted journalism.
We are collaborating with them to develop a cutting-edge digital advertising solution that optimizes media campaigns and enhances user engagement. The product is already in production, and we are continuously evolving its features to meet the dynamic needs of the market.

🔹Responsibilities
The job in short: join the mature and capable Identity team to work on everything related to login, authentication, and authorization for millions of end-users across numerous brands. As a member of this team, you’ll be responsible for software craftsmanship in the broad sense of the term. You’ll help define and refine solutions to problems in close collaboration with business stakeholders, develop software, and safeguard the technical foundation of our platforms (including automated tests, deployment pipelines, cloud infrastructure, monitoring, and production support). This role comes with full end-to-end ownership — from architecture decisions and implementation to release, production monitoring, operational support, and continuous improvement

🔹Requirements

- Strong backend developer with solid experience in Java and Spring framework ecosystem
- Knowledge of frameworks such as Angular or React is not required, but strong JavaScript fundamentals are essential
- Hands-on experience with AWS, especially with services such as Lambda
- Practical experience building cost-efficient solutions in AWS
- Well-versed in modern web technologies such as HTTP, REST, JSON, authentication flows, and distributed system integrations
- Experience working with both relational databases and non-sql (MongoDB)
- Strong communication skills

🔹Nice to have
- Experience with Playwright, Jest, or Vitest Interest in and/or experience with Identity-related topics such as OpenID Connect, OAuth, JWT, public key cryptography, and authentication platforms
- Experience with Thymeleaf Experience with other cloud providers in addition to AWS

🔹Interview Process
1. Recruitment Interview (30 minutes)
A short introduction to discuss your experience, expectations, and the role.
2. Technical Interview (90 minutes)
A technical discussion focused on your expertise, problem-solving skills, and engineering experience.
3. Take-Home Assignment
Showcase your technical skills by applying engineering best practices and clean code principles.
4. Final Interview (in English)
Present your assignment, explain your technical decisions, and discuss your approach with the team.

🔹9 reasons to join us:
1. Today we're working with the technology of tomorrow
2. We don't wait for a change. We are the change
3. We're experts in creating experts (Levi9 academy, Lead9 program for leaders)
4. No micromanagement. We are free birds with a clear understanding of what the high performance is!
5. Learning in Levi9 never stops (unlimited Udemy for business, meetups, English courses, Professional trainings)
6. Here you can train your body and mind
7. We've gathered the best locations - comfortable, cozy and pet-friendly offices in Kyiv (5 minutes from Olimpiyska subway station) and Lviv (5 minutes from the Opera Theatre) with regular offline internal events
8. We have master's degree in work-life balance
9. We are actively supporting Ukraine with constant donations and volunteering

Our client is a mobile gaming company building consumer-facing products played by millions of users. Their backend powers real-time game mechanics, player data, in-app economies, and live operations at scale. They move fast, ship often, and rely heavily on AI tooling to stay lean and effective.
 

 We are looking for a seasoned Backend Engineer to join the core platform team. You will design, build, and maintain the services that keep their games running reliably at high load. This is a hands-on engineering role with real ownership, not ticket-pushing.
 

Responsibilities

• Design and develop scalable backend services using Java and Spring Framework
• Build and maintain data pipelines and event-driven systems with Kafka
• Own the reliability and performance of PostgreSQL and Redis-based infrastructure
• Contribute to microservices architecture decisions and cloud (AWS) operations
• Work closely with game, mobile, and DevOps engineers to ship features end-to-end
• Actively use AI coding agents in daily development to increase throughput and quality
   

Requirements

• 5+ years of backend engineering experience
• Strong Java skills with hands-on Spring Framework (Core, Boot, Web, Security)
• PostgreSQL and Redis in production environments
• Kafka for async/event-driven communication
• Docker and containerized deployments
• Microservices design patterns and AWS (any combination of EC2, ECS, RDS, S3, SQS, etc.)
• Daily hands-on use of AI tools and coding agents — this is a hard requirement, not a preference
• English: Upper-Intermediate or higher (B2+)
   

Conditions

• Full-time or part-time (3 days/week)
• Remote with occasional travel to team offsites

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.

We are looking for a passionate and dedicated Strong Middle Java Developer to join our team in Lviv!

About the job:

It is a part of EveryMatrix platform that is responsible for collecting, storing, processing and utilizing hundreds of millions of transactions from the whole platform every single day. We develop Business Intelligent solutions, reports, 3rd party integrations, data streaming and other products for both external and internal use. The team consists of 35 people and is located in Lviv. We are looking for motivated, proactive developers willing to learn modern technologies, working in a challenging and fast-paced environment. You will be working in small cross-functional Agile teams responsible for the end-to-end development and component support using the You Build It, You Run It’ principle.

What You'll get to do:

• Extend and optimize the Rules Engine.
• Collaborate with cross-functional teams to deliver innovative solutions.
• Participate in code reviews and contribute to team knowledge sharing.
• Troubleshoot, debug, and resolve software defects and issues.
• Assist in designing and implementing new features.
• Develop unit and integration tests to ensure software quality.
• Document code, processes, and technical specifications.
• Stay up-to-date with Java best practices and emerging technologies.
• Support deployment and maintenance of applications in development and production environments.
• Participate in Agile ceremonies and contribute to sprint planning and retrospectives.

What You need to know:

• Java Core: Deep understanding of collections, performance tuning, type systems, garbage collection, and exception handling.
• Multithreading & Concurrency: Expertise in managing asynchronous computations and ensuring thread safety.
• HTTP & RESTful Services: Strong experience in developing and consuming RESTful services.
• RDBMS & SQL: Proficiency in writing complex SQL queries and a solid understanding of RDBMS theory.
• Spring Boot: Practical experience with the Spring ecosystem, including a strong theoretical foundation.
• Apache Kafka: Proven experience with Kafka, including both practical application and theoretical knowledge. Unit/Integration Testing: Demonstrated ability to write testable code with adequate coverage.

Nice to Have:

• Experience with Docker & Kubernetes. 
• Experience with the Google Cloud platform. 
• Knowledge of Online Casino/Sports Systems.

Here's what we offer:

• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment, with up to 50 days of work from home per year.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference! 
 

PLEASE NOTE that we are searching for candidates who are located in Lviv and are able to visit office in Lviv.

About us:

EveryMatrix is a leading B2B SaaS provider delivering iGaming software, content and services. We provide casino, sports betting, platform and payments, and affiliate management to 200 customers worldwide.

But that's not all! We're not just about numbers, we're about people. With a team of over 1000 passionate individuals spread across twelve countries in Europe, Asia, and the US, we're all united by our love for innovation and teamwork.

EveryMatrix is a member of the World Lottery Association (WLA) and European Lotteries Association. In September 2023 it became the first iGaming supplier to receive WLA Safer Gambling Certification. EveryMatrix is proud of its commitment to safer gambling and player protection whilst producing market leading gaming solutions.

Join us on this exciting journey as we continue to redefine the iGaming landscape, one groundbreaking solution at a time.
 

We are looking for a passionate and dedicated Trainee Java Developer to join our team in Lviv!

What You'll get to do:

• Take part in collecting odds data from bookmakers, both from dedicated XML/JSON feeds – using Java – and from websites – site scraping;
• Offer technical support for existing clients.
• Take part in the daily maintenance and monitoring of developed odds collectors and other internal tools.
• In addition, it is of very high importance to maintain the highest possible quality of data collected from existing sources.

What You need to know:

• Java 21: Virtual Threads, Sequenced Collections, Sealed Classes, 
  HttpClient​
• Multithreading: Threads, ExecutorService, ReentrantLock, basic synchronized, CompletableFuture​
• Streams & Optionals: Fluent with Stream API, Optional, aware of OM OptionalUtils​
• Collections: Clear understanding where and how to use List, Set, Map, Queue, Dequee, Collections.synchronizedMap, ConcurrentHashMap, Immutable collections​
• Regex: Basic usage with Pattern and Matcher for text parsing and validation​
• HTTP Basics: Knowledge of HTTP methods – GET, POST, PUT, DELETE, and their typical use cases
• Version Controll - SVN, Git
  
  Nice to Have:
• Java projects from school, personal work, or internships.
• Exposure to Jsoup or similar parsing libraries. Interest in sports or betting.
• Experience building web scrapers.​
• English: A2+

Here's what we offer:

• Start with 22 days of annual leave, with 2 additional days added each year, up to 32 days by your fifth year with us.
• 3 sick leave days per year, no doctor's note required; 30 medical leave days with medical allowance
• Hybrid work schedule is available after the first three months of employment, with up to 50 days of work from home per year.
• Benefit from two Free Fridays each year, limited to one per quarter.
• Daily catered lunch or monthly lunch allowance. 
• Private Medical Subscription. 
• Access online learning platforms like Udemy for Business, LinkedIn Learning or O’Reilly, and a budget for external training.
• Gym allowance.
• Corporate English lessons.
• Support for New Parents:
• 21 weeks of paid maternity leave, with the flexibility to work from home full-time until your child turns 1 year old.
• 4 weeks of paternity leave, plus the flexibility to work from home full-time until your child is 13 weeks old.

Our office perks include on-site massages and frequent team-building activities in various locations.

At EveryMatrix, we're committed to creating a supportive and inclusive workplace where you can thrive both personally and professionally. Come join us and experience the difference! 
 

👨‍💻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.

About PredictSpring

PredictSpring is a market-leading company shaping the future of omni-channel retail and modern POS technology. We help global retail and lifestyle brands deliver seamless, scalable, and modern customer experiences across digital and in-store channels.

We are looking for a highly skilled and experienced Senior Java Full Stack Engineer to join our team and help build secure, scalable, and high-performance software solutions across our platform, products, and business operations.

In this role, you will work across backend development, frontend applications, cloud infrastructure, microservices, APIs, messaging systems, and CI/CD workflows. You will play a key role in building reliable enterprise-grade systems that support modern commerce, retail operations, and customer experience.

Responsibilities

As a Senior Java Full Stack Engineer, you will:

• Design, develop, and maintain scalable, secure, and high-performance backend services using Java and frameworks such as Spring Boot, Spring Cloud, Spring MVC, and Hibernate.
• Build and maintain application workflows, APIs, services, and platform features that support PredictSpring’s product and business operations.
• Develop and implement RESTful APIs and GraphQL services for seamless integration between frontend applications, backend systems, third-party platforms, and internal tools.
• Work with cloud-based infrastructure using AWS services such as EC2, S3, Lambda, and RDS, as well as Azure services such as Azure Functions, Azure SQL Database, and App Services.
• Build responsive and maintainable frontend features using modern JavaScript frameworks such as React.js, Angular, or Vue.js.
• Work with messaging and event-driven technologies such as Apache Kafka, RabbitMQ, ActiveMQ, and JMS.
• Utilize Docker and Kubernetes to containerize applications, manage microservices, streamline deployments, and support scalable production environments.
• Collaborate with cross-functional teams, including product, engineering, design, operations, and business stakeholders, to deliver high-quality software solutions.
• Troubleshoot, debug, monitor, and optimize applications for performance, scalability, reliability, and maintainability using tools such as JProfiler, New Relic, Prometheus, or similar platforms.
• Write clean, efficient, maintainable, and testable code following Java best practices, design patterns, and modern software engineering standards.
• Participate in code reviews, architecture discussions, technical planning, and continuous improvement of engineering practices.
• Implement and manage CI/CD pipelines using tools such as Jenkins, GitLab CI, CircleCI, AWS CodePipeline, and Azure DevOps.
• Ensure security, data protection, authentication, authorization, and secure communication across applications and services using tools and practices such as Spring Security, OAuth2, JWT, SSL/TLS, and OWASP guidelines.
• Stay current with the latest Java technologies, cloud platforms, DevOps practices, and industry trends, and apply relevant improvements to PredictSpring’s platform and operations.

Requirements

We are looking for someone with:

• Excellent communication skills, including fluent verbal English, with the ability to explain technical concepts clearly and collaborate effectively across distributed teams.
• Bachelor’s or Master’s degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Proven experience as a Full Stack Engineer or Full Stack Developer, with a strong focus on Java 8 or later for backend development.
• Strong hands-on experience with Java frameworks such as Spring Boot, Spring Cloud, Spring MVC, Hibernate, and JPA.
• Strong experience designing, building, and maintaining scalable backend systems, APIs, microservices, and enterprise-grade applications.
• Experience with cloud technologies such as AWS and Azure, especially AWS EC2, AWS Lambda, AWS RDS, Azure Functions, Azure App Services, and Azure SQL Database.
• Extensive experience with frontend technologies such as JavaScript, React.js, Angular, or Vue.js.
• Expertise in containerization and orchestration technologies such as Docker and Kubernetes.
• Solid experience with SQL and NoSQL databases, including SQL Server, PostgreSQL, MySQL, MongoDB, Cassandra, Redis, or similar technologies.
• Experience with message brokers and event-driven architecture using tools such as Apache Kafka, RabbitMQ, or ActiveMQ.
• Strong working knowledge of RESTful API design and GraphQL for building reliable backend services.
• Experience with CI/CD tools such as Jenkins, GitLab CI, CircleCI, and cloud deployment services such as AWS CodePipeline and Azure DevOps.
• Knowledge of unit testing and integration testing frameworks such as JUnit, Mockito, Spring Test, or similar tools.
• Understanding of security best practices in the Java ecosystem, including Spring Security, OAuth2, JWT, SSL/TLS, and secure API design.
• Experience with version control systems such as Git and collaborative development workflows.
• Familiarity with agile development methodologies, sprint-based workflows, and collaborative engineering practices.
• Strong problem-solving and debugging skills, with the ability to resolve complex technical issues across both frontend and backend layers.

Preferred Qualifications

Nice to have:

• Experience with microservices architecture and distributed system design.
• Experience with tools and frameworks such as Spring Cloud, Netflix OSS, Hystrix, Eureka, or Docker Swarm.
• Familiarity with DevOps practices and infrastructure-as-code tools such as Terraform, Ansible, and CloudFormation.
• Experience with serverless computing using AWS Lambda or Azure Functions for scalable, event-driven applications.
• Experience with real-time data processing using tools such as Kafka Streams or message queue-based architectures.
• Familiarity with monitoring, observability, and logging tools such as Prometheus, Grafana, ELK Stack, Datadog, New Relic, or similar platforms.
• Experience with Agile/Scrum methodologies and project management tools such as JIRA.
• Experience supporting production systems, monitoring application health, and improving reliability over time.
• Experience working with high-traffic, scalable, customer-facing SaaS or enterprise platforms.
• Experience in retail, e-commerce, omni-channel commerce, or POS technology is a strong plus.

Why PredictSpring?

• Join a market-leading company shaping the future of omni-channel retail and modern POS.
• Work on high-impact engineering challenges at the intersection of commerce, cloud technology, and customer experience.
• Collaborate with a talented global team in a flexible remote work environment.
• Enjoy opportunities for growth, learning, and professional development.
• Contribute to products used by some of the world’s most recognized retail and lifestyle brands.
• Be part of an innovative, collaborative, and engineering-driven culture focused on building reliable, scalable, and measurable business value.

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! 🚀

Our client is a global leader in maritime intelligence and risk analytics, helping governments, defence organisations and global enterprises make critical decisions through data and AI-driven insights. We are looking for an Experienced Backend Engineer to join the team building the company’s core data platform that powers data processing, analytics and decision-making across the business.
 

What you'll be doing

• Building and maintaining high-performance backend services using Java and Spring Boot.
• Designing and developing scalable data pipelines and data processing services.
• Implementing real-time streaming solutions using Kafka.
• Working closely with data scientists, analysts and software engineers to support data-driven initiatives.
• Developing solutions for collecting, processing and transforming data from multiple sources.
• Leveraging AWS services for data storage, processing and analytics.
• Monitoring service performance, identifying bottlenecks and implementing optimisations.
• Ensuring data integrity, reliability and availability through robust ETL processes and data quality controls.
• Contributing to the adoption of AI-assisted development practices and modern engineering workflows.
   

Skills & Experience

• Bachelor's degree in Computer Science, Engineering or a related field.
• 5+ years of experience as a Backend Engineer.
• Strong Java development experience, including Spring Boot.
• Hands-on experience with Kafka and event-driven or streaming architectures.
• Experience building and supporting microservices-based systems.
• Experience with AWS cloud services.
• Strong understanding of ETL processes and large-scale data processing.
• Good working knowledge of Python.
• Experience with MySQL.
• Familiarity with Generative AI and LLM tools used throughout the software development lifecycle.
• Experience with Spark and/or SingleStore would be advantageous.
• Strong problem-solving skills, attention to detail and ability to work independently.
• Excellent communication skills in English.

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.

A next-generation cross-asset data management platform to provide globally consistent data and innovative tools to support business strategy for trade/sales clients, which is built on big data architecture, highly scalable, and cloud-ready. The platform enables industry-leading analytics, client reporting, regulatory compliance, surveillance, supervisory reporting, and data science solutions (data flame). The project tech stack: Java, Scala, Spring, SQL, Kafka, Hadoop.

We are looking for a strong Senior Java Developer capable of being able to work within the team, being a mentor for team members, communicating with stakeholders, and being accountable for the outcomes of activities that are assigned.

The role of the involves working with strong development teams (2 Senior Java Developers), the opportunity to work with big data, improving knowledge in this domain, and utilizing the resources of an international bank.

• Responsibilities:

  • Design and build frameworks for ingesting/modeling the complex Risk data
  • Develop Low latency caching to service Front office risk systems
  • Setup monitoring and management for services
  • Provide SME support for development of automated QA scripts

• Mandatory Skills Description:

  • Strong knowledge of Big Data technologies: Hadoop Ecosystem (HDFS, Impala, HIVE, HBASE, etc.) and Apache Spark. Green flags: Spark, Hive, Hadoop.
  • At least 5 years of experience in software development, including professional backend software development experience;
  • Strong Knowledge of Java programming languages
  • Should be familiar with algorithms and design patterns
  • Familiarity with Linux environment, including scripting skills
  • Designing and building APIs (Java);
  • Java Server-side or Back-end development;
  • Core Java;
  • Java collections and multithreading;
  • Java Memory Management;
  • Database and SQL (writing stored procedures, designing table schemas).
  • Understanding of distributed systems.
  • Understanding of CI/CD workflow.
  
  • Ability to multi-task and work under pressure.
  • Ability to pick up new concepts and apply the knowledge.
  • Demonstrated problem-solving skills.
  • Enthusiastic and proactive approach with a willingness to learn.
  • The candidate is expected to be dynamic and flexible with a high energy level as this is a demanding and rapidly changing environment