Jobs Java

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.
• 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.

Why this role exists:

This role exists to design, build, and maintain backend services across the Casino platform — bonus and promotional mechanics, wallet and transaction flows, game launch and catalog, and game provider integrations — ensuring reliability, correctness, and performance under high load.

What you’ll drive:

Casino platform services

• Design and develop Spring Boot microservices across the casino domain: bonus processing, game launch, lobby and game catalog management.
• Implement and evolve promotional mechanics end-to-end — from bonus crediting and wagering logic to expiry and settlement — with correctness guarantees on real money.
• Integrate third-party game providers, game launch, wallet callbacks (bet/win/refund), provider-side bonus features.
• Build and evolve REST APIs consumed by internal services and external providers, including request signing, authentication, and API versioning.

Reliability & correctness

• Ensure correctness of real-money transaction and bonus flows — idempotency, retries, timeouts, graceful degradation of downstream calls.
• Work with Redis for caching and session state; tune service performance under production load.
• Own observability: metrics (Micrometer/Prometheus, Grafana dashboards), structured logging, alerting.

Quality & delivery

• Write and maintain unit, integration, and functional tests (JUnit 5, Testcontainers).
• Ship via GitLab CI to Kubernetes; participate in code review and incident investigation.

What makes you a GR8 fit:

Must-have

• 5+ years of experience in back end.
• Commercial experience with strong proficiency in Java (17+) and Spring Boot 3.x (Web, Security, Data, Actuator).
• Experience building business-critical domain logic (payments, bonuses, billing, or similar money-adjacent flows).
• Solid experience integrating third-party REST APIs and designing your own.
• Understanding of distributed systems basics: idempotency, consistency, timeouts, retries, caching.
• Experience with SQL and at least one NoSQL store (Redis, Cassandra, or Elasticsearch).
• Upper-intermediate or higher level of English.

Nice-to-have

• Scala experience (parts of our wallet platform run on Scala / Play / Akka).
• Experience with Kafka and event-driven architectures (some of our services use Spring Cloud Stream).
• Experience running services on Kubernetes; familiarity with GitLab CI.
• Familiarity with Prometheus and Grafana.
• iGaming / betting domain experience.
•  

About FreySoft:

FreySoft is a team of IT professionals passionate about delivering meaningful digital transformations. Our expertise lies in project-based development, helping businesses across industries tackle complex challenges and achieve tangible results.

We foster a culture of ownership, flexibility, and initiative, ensuring that every team member has the opportunity to grow, contribute, and thrive. At FreySoft, people are our most valuable asset, and we empower them to make a real impact.

About the Role

This is not a traditional Tech Lead role focused on a single long-term project.

We’re looking for a Tech Lead —someone who can quickly join different client projects, establish engineering standards, lead development teams, and independently own technical decisions from day one.

Depending on business needs, you’ll either:

• lead a larger cross-functional engineering team on a strategic project;
• or oversee several smaller engineering teams simultaneously, helping each deliver successfully.

Every 4–6 months you may rotate to a new project, new domain, or even a different technology stack. We provide structured onboarding and expect experienced leaders who enjoy adapting quickly to new challenges.

What You’ll Do

• Own technical delivery for one or multiple client projects.
• Lead backend engineers through mentoring, code reviews, and engineering standards.
• Drive architectural decisions while balancing technical excellence with business needs.
• Communicate directly with client stakeholders without requiring day-to-day CTO involvement.
• Identify technical and delivery risks early and proactively mitigate them.
• Contribute to project estimations, architecture planning, and technical solution design.
• Stay hands-on with development when needed—review critical code, build prototypes, and resolve complex production issues.
• Help teams adopt AI tools responsibly while maintaining high engineering quality.

What We’re Looking For

Leadership

• Proven experience leading engineering teams in client-facing environments.
• Ability to take ownership instead of waiting for direction.
• Strong stakeholder communication and decision-making skills.
• Comfortable leading either one larger team or multiple smaller teams.
• Passion for mentoring engineers while maintaining high standards without micromanagement.

Technical Expertise

• Strong Kotlin and Spring Boot experience in production.
• Deep understanding of microservices architecture and API design.
• Experience with Kafka (including Kafka Connect), gRPC and Protobuf.
• Strong SQL skills with PostgreSQL, Yugabyte and jOOQ.
• Experience with Kubernetes, AWS, GCP and containerized environments.
• Strong debugging skills in distributed systems and high-load production environments.
• Ability to adapt to a new steck if needed

Nice to Have

• FinTech or Payments domain experience.
• Previous outsourcing or consulting background.
• Experience participating in pre-sales or technical discovery.
• Professional AWS or GCP certification.

Why Join FreySoft?

🌍 Work with international clients across different domains and modern technology stacks.

🚀 Every project brings new challenges instead of years of repetitive work.

🎯 Build your career toward Principal Engineer, Engineering Manager, or CTO-level leadership.

🤝 High level of ownership and trust—you’ll make decisions, not wait for approvals.

💡 AI-first engineering culture that values responsible use of modern development tools.

💰 Competitive compensation based on experience and impact.

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.
• 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.

ProArea Digital Agency is a team of experts who develop solutions for professional services, commerce, fintech, telecom, energy, and enterprise companies. We use best practices in software development and help clients build products ranging from startup MVPs to large-scale business-critical systems.
 

Key facts:

✓ Our main value is comfort and the first principle is “Don't nag” (Не нуди);
✓ We’ve received awards on Clutch and Behance for our development and design work;
✓ We work only with interesting projects and competent customers;
✓ We constantly improve our skills and expertise;
✓ We believe it’s important to work hard and play hard.

For more information, please visit our website: proarea.com
 

What we offer

Being a member of the ProArea team means:

• Flexible working schedule;
• Fully remote work;
• Long-term projects;
• Competitive compensation;
• 24 vacation days and sick days;
• Corporate English courses;
• Weekly team activities;
• Strong engineering culture and knowledge sharing;
• Friendly team and supportive environment.
   

About the Project

The project focuses on building and maintaining Identity and Access Management solutions using Keycloak and modern authentication standards.

IAM & Authentication

Solid knowledge of Identity and Access Management concepts and architecture.
Practical experience with authentication and authorization.
Understanding and implementation of SSO, RBAC, and MFA solutions.
Familiarity with modern identity and access security practices.

Keycloak
At least 1–3 years of commercial hands-on experience with Keycloak — required.
Experience deploying, configuring, administering, and supporting Keycloak environments.
Confident management of realms, clients, users, groups, roles, and permissions.
Hands-on experience customizing authentication/login flows and Keycloak themes — required.
Experience integrating Keycloak with LDAP and Active Directory.
Strong knowledge of SAML, OpenID Connect, and OAuth 2.0.

Backend & DevOps
Senior-level Java backend development experience.
Practical experience with containerized environments using Docker and Kubernetes.
Experience working with CI/CD pipelines and Linux-based infrastructure.
Familiarity with monitoring, centralized logging, and troubleshooting tools such as the ELK Stack.

Automation
Ability to automate infrastructure and IAM-related tasks using shell scripts and Ansible.
Experience with Keycloak Admin CLI and REST API for configuration and automation.

Security
Good understanding of TLS/SSL and secure communication.
Experience with token lifecycle/security and session management.
Knowledge of secure access control and Keycloak hardening/configuration practices.
Understanding of secure software development principles.

Location: EU or Ukraine (remote)
English: B2+
Workload: Full-time
 

Responsibilities

• Develop and maintain backend functionality using Java;
• Work with Keycloak-based identity and access management solutions;
• Configure and customize authentication and authorization functionality;
• Develop and maintain integrations with internal and external systems;
• Work with APIs and modern authentication protocols;
• Participate in architecture and technical decision-making;
• Contribute to application security and access-control practices;
• Work with containerized environments and CI/CD processes;
• Conduct code reviews and maintain high engineering standards;
• Collaborate with an international development team.
   

Skills Required

• 5+ years of commercial software development experience;
• Strong commercial experience with Java;
• Hands-on experience with Keycloak;
• Experience customizing Keycloak authentication flows and/or UI/themes;
• Good understanding of Identity and Access Management (IAM);
• Strong understanding of authentication and authorization concepts;
• Experience working with modern authentication protocols and standards;
• Experience designing and integrating REST APIs;
• Experience with Docker and containerized environments;
• Understanding of CI/CD and modern development workflows;
• Good understanding of application security principles;
• Strong problem-solving skills and proactive mindset;
• B2+ English communication skills.
   

Nice to Have

• Experience with Kubernetes;
• Experience with enterprise identity integrations;
• Linux experience;
• Automation or scripting experience;
• Experience with monitoring and logging tools;
• Experience with cloud environments;
• Frontend experience with Angular, React, Vue.js, or similar technologies;
• Experience working with enterprise or security-sensitive systems.
  
  We are looking for someone who
• Takes ownership of their work;
• Is proactive and self-driven;
• Can communicate effectively with international teams;
• Is comfortable working with complex integrations and security-related functionality;
• Enjoys solving challenging engineering problems.

About Us

Peratera is a UK-based fintech company, founded in 2022 and authorised by the FCA as an Electronic Money Institution. We are building a modern, all-in-one payment platform that enables businesses to manage global payments and financial operations seamlessly.

Our solution allows companies to open multi-currency accounts, send and receive payments worldwide, and manage cross-border transactions from a single platform. Our mission is to simplify global finance and remove friction from international business operations.

Your mission

As a Middle Java Engineer, you will be part of the team building and evolving the core services behind our financial platform.

This is a hands-on engineering role where you will have the opportunity to contribute to technical decisions, improve existing solutions, and help shape the future of product.

Your Tech Environment

You will work in a modern, cloud-native stack with clear ownership and no legacy surprises:

• Backend: Java 17+, Spring Boot (Core, Security, Data, Cloud), REST APIs, event-driven services, Camunda
• Infrastructure: AWS (EKS, RDS, CloudWatch), Docker, Kubernetes, GitLab CI/CD
• Data & Messaging: PostgreSQL, AMQP / Kafka-style message brokers, event-driven architecture
• Observability: OpenSearch / ELK, Prometheus / Micrometer, OpenTelemetry (in progress)
• Integrations: Open Banking providers, banking partners, external payment systems

What You’ll Do

• Design, develop, and maintain core platform services, including payment flows, transaction lifecycle, reconciliation, and wallet infrastructure
• Participate in architecture discussions and contribute to technical solutions aligned with the overall platform direction
• Write clean, maintainable, and well-tested code following established engineering standards
• Collaborate with other engineers through code reviews, knowledge sharing, and technical discussions
• Translate business and technical requirements into reliable and scalable backend solutions
• Work closely with Product and DevOps teams to deliver financial features end-to-end
• Contribute to the platform’s evolution toward AI-assisted and data-driven capabilities
• Help improve platform reliability, fault tolerance, observability, and performance at scale

What We’re Looking For

• 3+ years of commercial experience with Java in production environments
• Hands-on experience with the Spring Boot ecosystem and backend application developmentDeep expertise in the Spring Boot ecosystem and distributed systems at scale
• Experience working with distributed systems and developing scalable backend services
• Experience building or supporting financial products, such as payments, wallets, banking, or fintech solutions
• Good understanding of software engineering practices, including clean code, testing, and code reviews
• Strong experience with REST API development and messaging systems
• Comfortable working in a distributed, international team and collaborating asynchronously
• Familiarity with cloud environments, CI/CD pipelines, and observability tooling

Nice to Have

• Previous experience in fintech, banking, payments, EMI, or other regulated financial environments
• Familiarity with payment-related compliance requirements, including PCI DSS
• Exposure to Open Banking providers or integrations with payment schemes
• Experience with Camunda or other workflow orchestration tools
• Fully remote setup with flexible hours and an international, highly skilled team

What You’ll Get

• Competitive, market-aligned compensation — discussed openly at first interview
• Direct impact on architecture and strategic platform decisions from day one
• A real fintech platform running at production scale — not a demo environment
• Exposure to modern cloud-native, AI-assisted, and Open Banking systems
• Fully remote setup with flexible hours and an international, highly skilled team

Sounds like a match? Send us your CV — we’re excited to get to know you.

• Project Description:

  You will join a Regulatory Reporting Platform within a large US investment bank. The platform is responsible for collecting, processing, and transforming large volumes of data from multiple internal systems to produce regulatory reports for 240 jurisdictions worldwide. In total, the platform supports around 10,000 reports across a wide range of regulatory, compliance, financial, and risk reporting areas.
  This is a large-scale, business-critical data platform operating in a highly regulated environment, where data accuracy, quality, traceability, and timely delivery are essential. The team works on building and enhancing data pipelines, implementing reporting logic, ensuring data validation and reconciliation, and supporting the generation of complex regulatory outputs.
  The project is delivered by a global distributed team with colleagues located in Ukraine, Poland, and the US, offering close collaboration with engineers, analysts, and business stakeholders across multiple regions.

• Responsibilities:

  - Design, develop, and maintain solutions for a large-scale Regulatory Reporting Platform
  - Build and enhance data processing pipelines using Java and Apache Spark
  - Implement scalable logic for data ingestion, transformation, aggregation, and enrichment from multiple internal data sources
  - Develop and optimize batch processing jobs to support the generation of regulatory reports across multiple jurisdictions
  - Ensure high standards of data quality, validation, reconciliation, and consistency throughout the reporting lifecycle
  - Translate business and regulatory requirements into robust technical solutions
  - Collaborate with business analysts, QA engineers, and cross-functional teams to deliver reporting functionality
  - Investigate and resolve data and application issues in development, test, and production environments
  - Improve application performance, scalability, and reliability for high-volume data processing workloads
  - Contribute to the design and implementation of reusable components and engineering best practices
  - Participate in code reviews, testing, and release activities to ensure high-quality deliverables
  - Work closely with distributed teams across Ukraine, Poland, and the US in an agile delivery model
  - Support continuous improvement of the platform, including monitoring, troubleshooting, and operational stability

• Mandatory Skills Description:

  - 6+ years of commercial experience with Java
  - Experience in designing and developing scalable, high-performance backend applications
  - Good knowledge of SQL and working with large datasets from multiple data sources
  - Strong problem-solving skills and ability to work effectively in a global distributed team

• Nice-to-Have Skills Description:

  - Experience in financial services, investment banking, or regulatory reporting projects
  - Familiarity with data quality, reconciliation, and control frameworks
  - Experience working with large-scale enterprise data platforms
  - Knowledge of cloud environments and modern data platform architectures
  - Understanding of CI/CD practices and automated deployment pipelines
  - Experience working in Agile / Scrum teams within a distributed global setup

• Languages:
  • English: C1 Advanced

N-iX is looking for a Senior Mobile/Web engineer to join our team. 

The Investment and Pension Products (IPP) tribe at Raisin builds Raisin’s capital markets–based products, enabling customers to grow their wealth with confidence. We take complex, highly regulated financial systems and turn them into easy, transparent, and scalable product experiences. This is core to Raisin’s mission, given the central role these product lines play in Raisin becoming the home for our customers’ wealth.

The teams in the IPP tribe аре cross-functional and focused on the further internationalisation of Raisin’s investment products. The team owns the design, development, and operation of its services end-to-end, following a “you build it, you run it” mindset. This includes responsibility for system reliability, scalability, and continuous improvement in close collaboration with Product, Risk, and other stakeholders.

Team’s Stack:

• Backend: Java (Spring Boot), MySQL, Kafka, AWS
• Web: TypeScript, ReactJS
• Mobile: TypeScript, React Native

Responsibilities:

• Delight customers and internal stakeholders by building and maintaining high-quality customer-facing platforms and internal tools.
• Own the design, implementation, testing, deployment, and ongoing refinement of applications and services end-to-end.
• Guide features through the full lifecycle—from discovery and implementation to testing, iteration, and successful launch.
• Write clean, maintainable, secure, and well-tested code with a strong quality mindset (unit, integration, component, and contract testing where applicable).
• Collaborate closely with Product, UX, Risk, and other stakeholders to translate complex domain requirements into practical, efficient, secure, and compliant solutions.
• Actively participate in architecture discussions and contribute to defining technical standards, guidelines, and best practices.
• Continuously improve engineering processes, CI/CD pipelines, automation, and overall operational readiness to enhance developer productivity.
• Work in an agile, cross-functional team with end-to-end ownership and a strong sense of accountability.
• Use AI tools productively and responsibly to accelerate delivery and improve quality.
• Foster an inclusive and collaborative team culture through knowledge sharing, constructive feedback, mentoring, and pairing.
• Contribute to an environment of open communication, trust, and continuous improvement, taking responsibility for personal growth as well as the growth of the team.
  
   

Profile Description:
● University degree in CS/related field or equivalent practical experience.
● 5+ years of experience with React and React Native, with a proven track record of shipping production iOS/Android apps and Next.js web applications.

Technical skills:
● Proficiency in React, React Native, Next.js, React Hooks, and state management (Redux, Zustand, etc.).

• Hands-on experience with monorepo tooling (Nx, Turborepo) managing separate Web and Mobile repositories.
  ● Experience with Microfrontend (MFE) architectures on the web.
  ● Strong proficiency in TypeScript, JavaScript, HTML, CSS, and mobile-first responsive web design.
  ● Familiarity with CSS-in-JS (styled-components) and modern UI libraries (Material-UI, Radix UI). ● Experience with Next.js (App/Page Router), SSG, JAMstack, and headless CMS platforms is a plus.
  
  App lifecycle expertise:
  ● Hands-on experience with mobile app signing, store submissions (App Store, Google Play), and web deployments (Vercel, AWS).
  ● Experience with CI/CD automation using GitLab CI, Fastlane, and Expo EAS. 

We are developing a platform that receives securities and price data from multiple providers, enriches and validates it, and distributes the consolidated data to internal bank systems. Our team manages various web and desktop applications, web services, and Linux environments that enable visualization of securities and execution of related workflows.

Our components are built using Java 8-11, JavaScript/TypeScript, Oracle, and Spring 4-5, including Spring Boot.

• Responsibilities:

  - Develop back-end systems using Java with well-tested code.
  - Support the development environment, primarily through automation using Jenkins CI and Bash.
  - Evaluate and implement new development tools, libraries, and methodologies to enhance quality.
  - Conduct peer code reviews for changes in the project codebase.
  - Collaborate effectively with a global team across multiple time zones, demonstrating strong verbal and written communication skills.
  - Provide constructive suggestions and alternative solutions to team members to identify the most efficient and optimized approaches.

• Mandatory Skills Description:

  The role requires extensive expertise in Java SE and Java EE with over a decade of professional experience, emphasizing strong proficiency in the Spring framework, including Boot, IoC, MVC, AOP, Security, Data, JDBC, and testing components. The candidate must be skilled in SQL and relational databases, specifically Oracle, and have a solid understanding of Servlets, servlet containers such as Tomcat, and application servers like Weblogic. Familiarity with CI/CD processes and tools, notably TeamCity and Jenkins, is also essential.
  
  Hard skills include:
  - Advanced Java SE and Java EE development
  - Comprehensive Spring framework application
  - SQL query writing and database management using Oracle
  - Knowledge of Servlets, Tomcat, and Weblogic server environments
  - Experience with CI/CD pipelines using TeamCity and Jenkins
  - Practical Linux system navigation, file and permission management, user and group administration, process and service handling, security keys and certificates, and basic Bash scripting
  
  Soft skills focus on:
  - Analytical problem-solving to identify and implement effective, maintainable solutions
  - Collaborative discussion and consensus-building within the team to select optimal approaches

About Our Client:

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role:

We are looking for a Middle-level Software Engineer to work on the core query engine of a large-scale distributed data platform. You will develop features across query planning, optimization, and execution, contribute to performance-critical components, and help investigate and fix production issues reported by real enterprise customers.

This is a systems-level, backend engineering role focused on distributed data processing internals — not application development or CRUD services.

Responsibilities:

• Develop and maintain features across the query engine — planning, optimization, execution, and data access layers
• Write performance-conscious code in Java and/or C++
• Investigate and fix production and customer-reported issues under the guidance of senior engineers, including fixes delivered across multiple supported release lines
• Work with SQL semantics, query plans, and execution operators over large-scale distributed data
• Integrate with columnar formats, open table formats, and connectivity drivers
• Contribute to CI/CD and automated testing in Jenkins
• Deploy and validate changes on Kubernetes (GKE/EKS/AKS) across GCP, AWS, or Azure with Docker
• Debug issues across query planning, distributed execution, memory management, and I/O; collaborate with US-based teams on design and code reviews.

Required Qualifications:

• B.S. or M.S. in Computer Science, Computer Engineering, or a related field
• 3+ years in backend / systems software engineering
• Strong proficiency in Java or C++ with solid OOP and software design fundamentals, including concurrency and asynchronous programming (comfort with both languages is especially valued)
• Strong SQL and understanding of relational and analytical data systems, including query execution concepts
• Hands-on experience with data processing systems: query engines, distributed databases, ETL/ELT, or analytical platforms
• Experience with Jenkins pipelines and modern development workflows
• Docker and basic Kubernetes (running workloads, debugging pods, kubectl fluency)
• Hands-on experience with at least one major cloud (GCP, AWS, or Azure)
• Confident Git/GitHub workflows
• Comfortable with AI-assisted development workflows — using modern AI tools for code comprehension, debugging, and test generation, and critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings.

Desired Skills:

• Apache Arrow (columnar in-memory format) and SQL planner/optimizer frameworks such as Apache Calcite
• LLVM-based runtime expression compilation
• Open table formats — Apache Iceberg, Delta Lake, or Hudi — and columnar file formats such as Parquet, Avro, or ORC
• MPP query engines (Presto, Trino, or similar); exposure to distributed data platforms such as Spark, Snowflake, or Databricks
• Messaging systems: Kafka, NATS, or cloud pub/sub services
• Query planning, optimization, and execution internals
• Connectivity drivers: JDBC, ODBC, Arrow Flight
• Managed Kubernetes (GKE/EKS/AKS), multi-cloud exposure; Terraform
• Performance profiling of latency-sensitive systems.

Details:

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

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 

 

About the role

Are you ready to take your Java expertise to the next level? Join our team to work with a highly scalable, highly available, real-time advertising platform that serves millions of users worldwide and handles massive real-time data at scale. We are hiring a Software Engineer to be a vital part of this mission. If you bring extensive experience building complex systems, love great technology at scale, jumping in, and figuring things out in any system, this role is for you! Working in a modern, cloud-native environment, you’ll collaborate with a team of top engineers to develop low-latency, distributed systems capable of handling millions of QPS. This is an opportunity to combine innovation, performance engineering, and large-scale impact - while shaping the future of digital entertainment technology.
 

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.
 

Who are we looking for?

Skills & Experience

• 4+ years of experience building large scale and low latency distributed systems
• 5+ years of Java backend development experience;
• Solid understanding of algorithms, data structures, performance optimization techniques, object-oriented programming, multi-threading, and real-time programming 
• Experience with distributed caching, SQL/NO SQL, and other databases is a plus 
• Experience with Big Data and cloud services such as AWS/GCP is a plus
• Experience in advertising domain a big plus 
• Self-motivated individual with a high level of accountability and ownership
• Critical thinking and practical decision making
• Can do, results-oriented mindset
• Software development best practices: test-driven development, automated testing;
• Knowledge of distributed systems architecture and service oriented systems;

• English: B2+

   

Nice to have

• Familiarity with machine learning frameworks (e.g., TensorFlow, PyTorch) and working with large language models (LLMs)

   

Responsibilities

• Develop and maintain complex backend services
• Collaborate with cross-functional teams (Product, Design, QA) to deliver high-quality features;
• Write unit, integration, and end-to-end tests;
• Maintain and extend existing services to meet new requirements;
• Participate in code reviews and contribute to technical discussions;
• Help maintain technical documentation;
• Assist in improving CI/CD pipelines;
• Contribute to best practices within the development team.

ZentixSoft is looking for Full-Stack Developers! 🔥
 

Format: Full-Time Outstaffing, long-term project (12+ months).
 

💡 Why ZentixSoft? 
💸 Salary Review: A structured system of compensation reviews aligned with your engineering growth. 
⚖️ Work-Life Balance: Sustainable workflows with no senseless overtime, helping you keep your resource fully charged. 
🦾 Trust and Transparency: Zero micromanagement and no invasive time-trackers—we fully trust your professional autonomy.
 🎁 Gifts & Culture: Corporate gifts for holidays, birthdays, and a true team atmosphere where your voice always matters.
 

Our Perfect Match: 
1️⃣ Full-Stack Stack: Strong proficiency in Java Spring Boot on the backend and React / Next.js on the frontend. 
2️⃣ Architecture: Understanding and practical experience with Modular Monolith Architecture. 
3️⃣ Technologies: Experience working with MySQL, Redis, and ActiveMQ. 
4️⃣ Infrastructure: Basic or practical understanding of containerization and Kubernetes. 
5️⃣ Communication: Confident English skills (B1+) for daily team syncs.
 

Project Details: 
⏳ Duration: 12+ months (Full-time).
 🚀 Start: In 1 month.

С4R — міжнародна консалтингова компанія у галузі розробки та впровадження інноваційних рішень для рітейлу. Головний офіс — у Празі, а найбільша частина команди знаходиться в Україні. Спираючись на сотні успішних проектів по всьому світу, ми допомагаємо клієнтам впроваджувати сучасні IT-рішення, що підсилюють бізнес і покращують операційну ефективність.

Зараз ми шукаємо Middle Java Developer у нашу команду.

Кого ми шукаємо

Фахівця, який:

• впевнено працює з Java та суміжним стеком;
• вміє розбиратися у складних задачах, шукати технічні рішення;
• може якісно підтримувати існуючий функціонал та розвивати новий;
• має системне мислення, акуратність у коді та готовність працювати в команді;

Основні задачі

• Розробка нового функціоналу в існуючому програмному забезпеченні
• Аналіз помилок, багфікс
• Розробка інструментів та внутрішніх рішень для стабільної роботи системи

Стек технологій

• Мови:

Java, JavaScript, Bash, HTML/CSS, SQL

• Фреймворки та інструменти:

Spring / Spring Boot / Spring JPA / Hibernate

AngularJS

Git

Наші переваги

• Комфортна атмосфера підтримки — ми спілкуємося на рівних та цінуємо взаємну допомогу

• Середовище розвитку — можливість професійного росту разом із компанією

• Командна робота — ми цінуємо внесок кожного в спільний результат

• Life-work balance — пропонуємо зручний графік та можливість поєднувати роботу з тим, що важливо саме для вас

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.   

   

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!