Jobs Java

Are you interested in working with cutting-edge technologies and developing high-performance applications capable of handling over 2 million data queries per second? If so, we have the perfect job for you at LoopMe! 

We are a team of skilled engineers who develop and maintain real-time bidding platforms for global advertisers. As part of our team, you will work alongside other talented engineers on a daily basis, using technologies such as Java, Postgres, Clickhouse, Kafka, and others to scale performance, optimize cloud infrastructure, and create innovative features for our various product lines. At LoopMe, we follow Agile methodology to deliver features rapidly to the market. 

Join us and be a part of our mission to push the boundaries of what is possible in the advertising industry!
 

What we need

We are looking for a Senior Java Backend Engineer to help build out our high-load ad serving system, capable of handling over 2M requests/second under 50ms response time.
 

What you'll be doing

• Developing features and performance optimisation for our Java ad-serving application
• Implementing complex targeting algorithms developed by our data science team into the core ad-serving flow
• Implementing backend for BI ad-hoc queries
   

Must have skills

• Java 17+ (Spring Boot, Gradle)
• REST API design and implementation
• SQL (PostgreSQL) + experience with schema migrations
• Experience with microservices architecture
• Production experience with GCP or similar cloud platform

Strong testing practices (unit + integration

Nice-to-have

• GraphQL (consumer or provider side)
• OpenRTB / ad tech domain knowledge
• Kubernetes / GKE
• Experience with event-driven systems
• AI/agentic coding tools (Claude Code, Copilot)

Soft skills

• Can operate independently on ambiguous problems
• Comfortable working with a distributed team (Ukraine, Poland, UK)
• Willing to mentor mid-level BE devs

Benefits:
 

• Competitive compensation package
• Flexible working schedule and the hybrid type of work
• Annual performance bonus (up to 10%)
• One month of workation (you can work from any part of the world for one month)

To all recruitment agencies: LoopMe does not accept agency resumes. Please do not forward resumes to our jobs career page, LoopMe employees or any other company location. LoopMe is not responsible for any fees related to unsolicited resumes.

A global marketplace for savings and investments, providing users with seamless access to high-yield savings accounts and investment options from over 400 partner banks worldwide. The platform removes geographic barriers while ensuring transparency, convenience, and competitive rates. For banks, it delivers cost-efficient deposit funding and innovative Banking-as-a-Service solutions. The team is responsible for the integration of transaction accounts, hosted via our servicing banks, into the Raisin platform. They ensure smooth funding across all products, correctly routing incoming and outgoing payments to their intended destinations. The team consists of 10 members working collaboratively in a cross-functional setup.

Responsibilities:

• Deliver core services and high-quality solutions for a large-scale online platform and its banking systems.
•  Integrate externally developed components into existing applications.
• Define standards, share best practices, and contribute to continuous learning within the team.
• Perform software engineering tasks with a strong focus on quality and support teammates in maintaining the same standards.
• Conduct thorough code reviews, covering best practices, business rules, performance, security, and impact on other features/projects, always providing constructive and respectful feedback.
• Collaborate within the team to negotiate and document software development standards and practices.
• Research and propose multiple technical solutions whenever possible.
• Take end-to-end ownership of project delivery within the team.
• Maintain and manage technical documentation and address technical debt proactively.
• Participate in the hiring process through tech-fit interviews and technical challenge evaluations.

Requirements:

• 6+ years of overall software development experience.
• Minimum 5 years of experience with Java and Spring Boot.
• Strong understanding and hands-on application of design patterns.
• Practical experience with testing practices (unit, integration) using tools such as JUnit, Mockito, TestContainers.
• 4+ years of experience with AWS Services, Kubernetes, event-driven architectures (Kafka or ActiveMQ), Spring Boot, SQL, and NoSQL.
• Excellent communication skills with the ability to articulate challenges and solutions clearly.
• Proven team player who collaborates effectively and supports shared goals.
• Strong critical thinking and problem-solving skills, with the ability to analyze production issues and design robust solutions (highly desirable).
• Proactive in supporting teammates and driving technical improvements (strongly preferred).
• High responsibility when working with payments, as this is a critical, core functionality for the company.

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries. 

About the Product:

Over the past few years Coro has received $275M in funding and is one of the fastest growing Cybersecurity companies in the world. The funding is primarily being used to enhance the Coro Cybersecurity SaaS platform and for additional headcount growth, as Coro continues to expand globally.   

Coro started in Tel-Aviv, Israel and is also headquartered in Chicago, IL with additional offices in New York, London, and remotely across the globe. As a global organization, Coro gives you the ability to work with people and teammates from around the world. 

Coro’s AI enabled Modular Cybersecurity Platform is the only one in the industry specifically designed to provide Mid-Market customers with scalable and affordable “enterprise grade” protection for all of their priority threat vectors. 

About the Role:

This is a hands-on leadership role for a Backend Team Lead who will guide a team of backend engineers while staying directly involved in coding, architecture, and delivery. You will work on core backend systems behind Coro’s cybersecurity platform, building and scaling high-load services that process large volumes of security and telemetry data in real time.

These systems are responsible for collecting, processing, and analyzing data from multiple sources, including endpoints, cloud environments, and product integrations. They support critical product capabilities such as threat detection, security analytics, anomaly identification, and automated response workflows, making this a mission-critical leadership role at the core of Coro’s product.

If you are looking for a role where you can combine leadership with technical ownership, shape team culture, and build highly scalable backend services for a fast-growing global cybersecurity platform, this is the role for you

Key Responsibilities:

• Lead a team of highly skilled and passionate developers
• Partner with the Product Manager to build the road-map for the team
• Understand the team objectives and key results and make sure that the team are on the path to achieving them
• Participate in making decisions on the architecture and technologies
• Conduct the team ceremonies: Daily stand-ups, sprint planning and retro meetings
• Help create and enforce strong engineering standards, code quality, and best Engineering practices
• Take an active part in the implementation (hands-on) of the team’s various services and features
• Help your team members grow by mentoring them, building their growth plan with them and enable them opportunities to implement it

Required Competence and Skills:

• 6+ years of backend/server-side development with Java
• 2+ years of proven experience leading an engineering team 
• Strong hands-on experience with Spring Framework and MongoDB
• Deep understanding of multithreading and concurrency
• Solid knowledge of OOP concepts and design patterns
• Proven experience with microservices architecture
• Experience working with high-load backend systems
• Proficiency in cloud-native environments (preferably AWS)

Nice to have:

• Experience with Redis and RabbitMQ
• Experience with Elasticsearch/OpenSearch 
• Familiarity with Docker / Kubernetes
• Experience in Cybersecurity domain 

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries. 

About the Product:

The company is building an AI-driven cybersecurity SaaS platform designed to help businesses protect their digital environments through a unified and modular approach. Its solution integrates multiple layers of security, including endpoint protection, cloud monitoring, data security, and user activity analysis, all managed within a single ecosystem. With a focus on mid-sized organizations, the platform delivers scalable, enterprise-grade protection while remaining cost-effective and easy to deploy. 

Backed by significant investment, the company is rapidly expanding its global footprint and growing a distributed international team. By leveraging advanced machine learning and real-time analytics, it enables organizations to streamline security operations, automate threat detection, and respond to incidents more efficiently. 

About the Role:

This is a hands-on leadership role for a Backend Team Lead who will guide a team of backend engineers while staying directly involved in coding, architecture, and delivery. You will work on core backend systems behind Coro’s cybersecurity platform, building and scaling high-load services that process large volumes of security and telemetry data in real time.

These systems are responsible for collecting, processing, and analyzing data from multiple sources, including endpoints, cloud environments, and product integrations. They support critical product capabilities such as threat detection, security analytics, anomaly identification, and automated response workflows, making this a mission-critical leadership role at the core of Coro’s product.

If you are looking for a role where you can combine leadership with technical ownership, shape team culture, and build highly scalable backend services for a fast-growing global cybersecurity platform, this is the role for you

Key Responsibilities:
 

• Lead a team of highly skilled and passionate developers
• Partner with the Product Manager to build the road-map for the team
• Understand the team objectives and key results and make sure that the team are on the path to achieving them
• Participate in making decisions on the architecture and technologies
• Conduct the team ceremonies: Daily stand-ups, sprint planning and retro meetings
• Help create and enforce strong engineering standards, code quality, and best Engineering practices
• Take an active part in the implementation (hands-on) of the team’s various services and features
• Help your team members grow by mentoring them, building their growth plan with them and enable them opportunities to implement it

Required Competence and Skills:

• 6+ years of backend/server-side development with Java
• 2+ years of proven experience leading an engineering team 
• Strong hands-on experience with Spring Framework and MongoDB
• Deep understanding of multithreading and concurrency
• Solid knowledge of OOP concepts and design patterns
• Proven experience with microservices architecture
• Experience working with high-load backend systems
• Proficiency in cloud-native environments (preferably AWS)

Nice to have:
 

• Experience with Redis and RabbitMQ
• Experience with Elasticsearch/OpenSearch 
• Familiarity with Docker / Kubernetes
• Experience in Cybersecurity domain 

We are looking for an experienced Senior Java Full Stack Engineer to join our development team.

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services, and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.

Responsibilities:

• Hands-on full-stack development of innovative applications
• Owning the entire development cycle, including design, architecture, development, and DevOps
• Working in XP with Remote pairing
•  

Requirements:

• BS degree in Computer Science or equivalent combination of education and experience
• 5-6+ years of full-stack development
• 5-6+ years of experience in the following technologies: Java, Spring
• Experience with Functional Programming and Java Streams
• 2+ years of experience in front-end development with React
• Experience with developing a reactive UI (Reactive JS)
• 2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
• 2+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
• Experience in DevOps development and Jenkins
• Experience in development in Kotlin – an advantage
• Experience in designing, developing, and deploying cloud/hybrid-based solutions
• Experience in developing and deploying in container-based environments (Kubernetes, Cloud Foundry)
• Familiarity with the following design concepts: micro-services, service discovery, circuit breaker
• Self-starter with the ability to appropriately prioritize and plan complex work in a rapidly changing environment
• Versatility and the capability to switch easily between different tasks and technologies
• Experience in assessing a broad range of information solutions and products
• Strong critical thinker with problem-solving aptitude
• Good English - verbal and written

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries. 

About the Product: 

The company is building an AI-driven cybersecurity SaaS platform designed to help businesses protect their digital environments through a unified and modular approach. Its solution integrates multiple layers of security, including endpoint protection, cloud monitoring, data security, and user activity analysis, all managed within a single ecosystem. With a focus on mid-sized organizations, the platform delivers scalable, enterprise-grade protection while remaining cost-effective and easy to deploy. 

Backed by significant investment, the company is rapidly expanding its global footprint and growing a distributed international team. By leveraging advanced machine learning and real-time analytics, it enables organizations to streamline security operations, automate threat detection, and respond to incidents more efficiently.

About the Role: 

This is a hands-on leadership role for a Backend Team Lead who will guide a team of backend engineers while remaining actively involved in coding, architecture, and delivery. You will work on core backend systems of a modern cybersecurity platform, building and scaling high-load services that process large volumes of security and telemetry data in real time.

These systems are responsible for collecting, processing, and analyzing data from multiple sources, including endpoints, cloud environments, and third-party integrations. They support key product capabilities such as threat detection, security analytics, anomaly identification, and automated response workflows, making this a mission-critical role at the heart of the product.

This role offers the opportunity to combine leadership with deep technical involvement, influence system architecture, shape engineering practices, and build scalable backend solutions within a fast-growing, globally distributed product organization

Key Responsibilities: 

• Lead a team of highly skilled and passionate developers
• Partner with the Product Manager to build the road-map for the team
• Understand the team objectives and key results and make sure that the team are on the path to achieving them
• Participate in making decisions on the architecture and technologies
• Conduct the team ceremonies: Daily stand-ups, sprint planning and retro meetings
• Help create and enforce strong engineering standards, code quality, and best Engineering practices
• Take an active part in the implementation (hands-on) of the team's various services and features

• Help your team members grow by mentoring them, building their growth plan with them and enable them opportunities to implement it

   

Required Competence and Skills:

• 6+ years of backend/server-side development with Java
• 2+ years of proven experience leading an engineering team 
• Strong hands-on experience with Spring Framework and MongoDB
• Deep understanding of multithreading and concurrency
• Solid knowledge of OOP concepts and design patterns
• Proven experience with microservices architecture
• Experience working with high-load backend systems
• Proficiency in cloud-native environments (preferably AWS)

Nice to have:

• Experience with Redis and RabbitMQ
• Experience with Elasticsearch/OpenSearch 
• Familiarity with Docker / Kubernetes
• Experience in Cybersecurity domain 

Why Us?

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract.

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract.

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

About the Company:

🌎 Akvelon is a USA-based software engineering and consulting company with offices across the USA, Poland, Ukraine, Serbia, and Mexico. We are an official vendor of Google and Microsoft and partner with Fortune 500 clients and global technology leaders.

At Akvelon, engineers work on large-scale cloud, AI, distributed systems, and enterprise platform projects used by millions of users worldwide.

Project Description:

We are hiring Senior Engineers for a strategic enterprise cloud data infrastructure project focused on expanding and improving the Managed Kafka Connect ecosystem.

The team is responsible for accelerating onboarding and productionization of first-party Kafka connectors for a large-scale managed streaming platform. Engineers will work on high-scale distributed data infrastructure, connector reliability, cloud integrations, CDC systems, and operational readiness.

Planned connectors include:

• Apache Iceberg Sink
• Debezium MySQL Source
• Debezium MongoDB Source
• SQL Server CDC Source
• Spanner CDC Source
• BigTable Sink
• BigQuery Sink improvements

The project includes:

• OSS connector integration
• Performance optimization
• Cloud authentication integration
• Reliability engineering
• Load testing
• Production readiness
• Kafka Connect ecosystem improvements

This engagement offers the opportunity to work on enterprise-scale distributed systems and modern cloud data infrastructure used by global technology platforms.

Responsibilities:

• Integrate and productionize Kafka Connect connectors
• Improve performance, scalability, and reliability of distributed data systems
• Optimize JVM applications and troubleshoot bottlenecks/OOM issues
• Work with Kafka Connect internals and connector lifecycle
• Implement cloud authentication and networking integrations
• Participate in operational readiness activities:
  • Load testing
  • Probers
  • Playbooks
  • Launch reviews
• Collaborate with distributed engineering teams
• Contribute to backend services written in Java and partially Go

Requirements:

Must Have:

• 5+ years of backend engineering experience
• Strong Java / JVM expertise
• Experience with performance tuning and troubleshooting
• Strong understanding of distributed systems
• Hands-on experience with Apache Kafka and Kafka Connect
• Experience debugging production infrastructure issues
• Experience with build systems and dependency management
• Experience with cloud infrastructure (preferably GCP)
• Upper-Intermediate+ English

Nice to Have:

• Apache Iceberg experience
• Debezium experience
• CDC systems knowledge
• Go backend development experience
• Kubernetes knowledge
• SRE / operational readiness background
• OSS contribution experience
• Experience with large-scale platform engineering

Working Conditions and Benefits:

• Paid vacation and sick leave
• Official state holidays — 9-11 public holidays per year
• Professional growth through challenging projects and the opportunity to master new technologies
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support programs (discounts, healthcare, legal assistance)
• Paid external training, conferences, and professional certifications aligned with business goals
• Internal workshops, seminars, and English classes
• Corporate library with paper and e-books

This position is not open to U.S.-based applicants.

Ready to work on distributed systems? Apply now and join our team.

Responsibilities

• Design, develop, and maintain scalable backend applications using Java.
• Build RESTful APIs and integrate with third-party services.
• Participate in system architecture and technical design discussions.
• Optimize application performance, reliability, and security.
• Write clean, maintainable, and well-tested code.
• Collaborate with cross-functional teams including Product Managers, QA, and DevOps engineers.
• Communicate directly with German-speaking stakeholders and participate in meetings in German.
• Mentor junior developers and perform code reviews.
   

Requirements

• 5+ years of commercial experience with Java development.
• Strong knowledge of Java and Spring Boot.
• Experience with Hibernate / JPA.
• Solid understanding of microservices architecture.
• Experience with REST APIs and asynchronous communication.
• Knowledge of relational databases such as PostgreSQL, MySQL, or Oracle Database.
• Familiarity with Apache Kafka or other messaging systems.
• Experience with Docker and Kubernetes.
• Knowledge of CI/CD tools such as Jenkins or GitLab CI/CD.
• Experience with cloud platforms (Amazon Web Services, Google Cloud, or Microsoft Azure) is a plus.
• Upper-Intermediate or higher German language skills (B2+).
• Good English communication skills.
   

Nice to Have

• Experience in finance, insurance, logistics, or enterprise SaaS projects.
• Knowledge of Domain-Driven Design (DDD).
• Experience with automated testing frameworks such as JUnit and Mockito.

About the Company:

🌎 Akvelon is a USA-based software engineering and consulting company with offices across the USA, Poland, Ukraine, Serbia, and Mexico. We are an official vendor of Google and Microsoft and partner with Fortune 500 clients and global technology leaders.

At Akvelon, engineers work on large-scale cloud, AI, distributed systems, and enterprise platform projects used by millions of users worldwide.

Project Description:

We are hiring Senior Engineers for a strategic enterprise cloud data infrastructure project focused on expanding and improving the Managed Kafka Connect ecosystem.

The team is responsible for accelerating onboarding and productionization of first-party Kafka connectors for a large-scale managed streaming platform. Engineers will work on high-scale distributed data infrastructure, connector reliability, cloud integrations, CDC systems, and operational readiness.

Planned connectors include:

• Apache Iceberg Sink
• Debezium MySQL Source
• Debezium MongoDB Source
• SQL Server CDC Source
• Spanner CDC Source
• BigTable Sink
• BigQuery Sink improvements

The project includes:

• OSS connector integration
• Performance optimization
• Cloud authentication integration
• Reliability engineering
• Load testing
• Production readiness
• Kafka Connect ecosystem improvements

This engagement offers the opportunity to work on enterprise-scale distributed systems and modern cloud data infrastructure used by global technology platforms.

Work from the office Poland, Krakow

Responsibilities:

• Integrate and productionize Kafka Connect connectors
• Improve performance, scalability, and reliability of distributed data systems
• Optimize JVM applications and troubleshoot bottlenecks/OOM issues
• Work with Kafka Connect internals and connector lifecycle
• Implement cloud authentication and networking integrations
• Participate in operational readiness activities:
  • Load testing
  • Probers
  • Playbooks
  • Launch reviews
• Collaborate with distributed engineering teams
• Contribute to backend services written in Java and partially Go

Requirements:

Must Have:

• 5+ years of backend engineering experience
• Strong Java / JVM expertise
• Experience with performance tuning and troubleshooting
• Strong understanding of distributed systems
• Hands-on experience with Apache Kafka and Kafka Connect
• Experience debugging production infrastructure issues
• Experience with build systems and dependency management
• Experience with cloud infrastructure (preferably GCP)
• Upper-Intermediate+ English

Nice to Have:

• Apache Iceberg experience
• Debezium experience
• CDC systems knowledge
• Go backend development experience
• Kubernetes knowledge
• SRE / operational readiness background
• OSS contribution experience
• Experience with large-scale platform engineering

Working Conditions and Benefits:

• Paid vacation and sick leave
• Official state holidays — 9-11 public holidays per year
• Professional growth through challenging projects and the opportunity to master new technologies
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support programs (discounts, healthcare, legal assistance)
• Paid external training, conferences, and professional certifications aligned with business goals
• Internal workshops, seminars, and English classes
• Corporate library with paper and e-books

This position is not open to U.S.-based applicants.

Ready to work on distributed systems? Apply now and join our team.

Dripify (🔗 dripify.com) is a pioneering, remote-first IT product company specializing in outreach automation products. Our platform empowers businesses by revolutionizing hiring, sales, and marketing communication processes, making interactions more efficient and seamless.

We’re looking for a Java Team Lead who will split their time between hands-on backend development (50%) and technical/team leadership (50%).
 

You’ll lead a team of 5 engineers, ensure delivery quality, and own architectural decisions, while also contributing code and driving technical excellence.
 

Requirements
 

• 5+ years of hands-on Java development experience (Java 21+).
• 2+ years leading a development team.
• Deep practical experience with Spring Boot modules (Web, Security, Data, Messaging).
• Strong knowledge of Java concurrency, multithreading, and backend system design.
• Proficient in SQL databases (PostgreSQL preferred).
• Experience with REST APIs and asynchronous messaging (SNS/SQS).
• Skilled in CI/CD, code quality gates, and automated testing.
• Hands-on with Docker, Linux, and system-level debugging.
• Familiar with monitoring/logging tools (ELK, Prometheus, Grafana).
• Strong focus on security best practices: auth, validation, access control.
• Working knowledge of AWS: IAM, EC2, RDS, S3, CloudWatch, Secrets Manager.

Would be a plus:
 

• Experience in designing and operating microservice-based architectures.
• Familiarity with Kubernetes (EKS or self-managed).
• Experience with Terraform and Infrastructure-as-Code.
• AWS Certifications (e.g., Developer Associate, Solutions Architect).

• Bachelor’s or Master’s in Computer Science or related field.
  
   

   

Responsibilities
 

Development (50%)

• Build modular, secure, and maintainable backend systems using Java 21+ and Spring Boot.
• Design and implement RESTful APIs and event-driven services (SNS/SQS).
• Write tested, high-quality code with strong focus on unit/integration testing.
• Ensure CI/CD integration, monitoring, and production readiness.
• Drive system performance and scalability improvements.

Leadership & Delivery (50%)

• Lead a backend team: mentorship, code reviews, and engineering growth.
• Own delivery quality: scope planning, progress tracking, risk mitigation.
• Document and communicate architectural decisions.
• Coordinate cross-functionally with product managers, DevOps, and QA.
• Promote best practices in secure development and clean architecture.
   

Work conditions
 

• 100% remote position, providing flexibility and work-life balance.
• Competitive salary reflecting your skills and expertise.
• 24 days of paid vacation per year to recharge and relax.
• 10 days of paid sick leave.
• Educational opportunities.
• Compensation budget for medical and hobby/sport expenses.
• Generous budget for birthdays and anniversaries.
• Online and offline team events.

• A collaborative and innovative work environment with passionate team members.

  
   

Hiring process
 

✅ Interview with Recruiter (45 min) — ✅ Technical interview with Engineering Manager (90 min) — ✅ Interview with CTO (45 min) — ✅ Reference check — ✅ Offer

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract.

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract or Business Incubator 

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

Our Customer:

A product-focused organization developing innovative enterprise-grade solutions, with a strong emphasis on modern engineering practices, AI-driven development, and high-performance distributed systems.

Your tasks:

• Design, develop, and maintain full-stack applications using Java, Spring, Python, and React.
• Own the entire development lifecycle — from architecture and design to implementation, testing, and deployment.
• Work in an Extreme Programming (XP) environment with remote pair programming.
• Build scalable microservices-based systems using Spring Boot and related technologies.
• Develop responsive and reactive user interfaces using modern JavaScript frameworks.
• Apply TDD/BDD practices to ensure high-quality, maintainable code.
• Contribute to DevOps processes, including CI/CD pipelines and automation using Jenkins.
• Design and deploy cloud and hybrid solutions in containerized environments (Kubernetes, Cloud Foundry).
• Collaborate closely with cross-functional teams in a fast-paced, dynamic environment.
• Participate in building AI-driven features, including working with LLMs and prompt engineering.

Required experience and skills:

• 8+ years of experience in software development with strong expertise in Java and Spring.
• 2+ years of hands-on experience with Python.
• Experience working in microservices architecture (Spring Boot / Spring Cloud).
• Strong understanding of modern software design patterns (microservices, service discovery, circuit breaker).
• Hands-on experience with TDD/BDD frameworks (Junit, Jasmin, Mockito, Protractor/Selenium).
• Experience with DevOps practices and tools, including Jenkins.
• Experience with containerization and orchestration (Kubernetes, Cloud Foundry).
• Experience building and deploying cloud or hybrid solutions.
• Experience with functional programming and Java Streams.
• Experience with reactive UI development.
• Hands-on experience with Claude.code.
• Upper-Intermediate or higher level of English.

Would be a plus:

• Frontend development experience, primarily with React.
• Experience with data analytics or data-driven systems.
• Knowledge of Kotlin.