Jobs Java

About the Project

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

What You'll Do

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

Must Have

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

Nice to Have

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

Location: EU / Remote (Ukraine)

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

• 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: B2 Upper Intermediate

S* S* Inc

S* S* Science Inc is a U.S.-based fintech company operating in the investment and financial services space. Our distributed teams work across Poland, the United States, and Ireland, collaborating on technology-driven solutions related to stocks and investments.

Security, compliance, and the responsible handling of sensitive financial data are central to how we operate as we build scalable products in a regulated environment.

Project

The engineer will initially get familiar with the product, domain, and existing codebase by working on current issues and fixes. After onboarding, the role will gradually expand into the development of new change requests and product enhancements.

The project is focused on backend development within a complex fintech environment involving distributed systems, microservices, event-driven architecture, cloud technologies, and data-intensive applications.

Requirements

We are looking for an experienced backend engineer with strong hands-on experience in:

• Core Java and Spring
• Server-side development
• SQL
• Microservices
• REST APIs
• Kafka and event-driven architectures
• Python
• Kubernetes
• GitHub
• Redis and caching
• Azure
• Snowflake
• PostgreSQL
• Cloud-native development
• CI/CD
• Distributed systems
• Concurrency
• Multi-tenancy
• Data governance

Experience with modern LLM and agentic technologies is highly valuable, including:

• Prompt engineering
• Model Context Protocol (MCP)
• Retrieval-Augmented Generation (RAG)
• LLM/agentic development

Engagement Details

Initial contract duration: 1 year, with the possibility of extension based on performance and skill set
Hourly remuneration: $32.5 USD/hour for a Middle engineer – 35 USD/hour  for a Senior Engineer 
Engagement: Full-time
Location / time zone: Poland
Working language: English
Working hours: Standard Polish working hours, with at least 4 hours of overlap with U.S. Eastern Time

Recruitment Process

The recruitment process follows our standard interview stages, including technical and client-side evaluation.

Important — Please Read Before Applying

The client is building a product in the banking, investment, and brokerage systems domain. Due to strict investor, security, and compliance requirements, every candidate must successfully complete a background check.

For this reason, candidates must:

• be currently based in Poland;
• have been a taxpayer in Poland for at least 2 years;
• be able to provide the required documentation for the background-check process.

We are looking for someone who can quickly understand an existing system, resolve complex backend issues, and gradually take ownership of new development in a security-sensitive fintech environment.

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

Skills

Must have

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

Nice to have

Experience In-memory databases and caching

Job Orchestration tools like Autosys or Airflow

Apache Spark

Financial background (where possible)

Job Description

- 2+ years of Java developing and boostering automated QA systems and associated test strategies.
- Experience working with business-critical customer-facing applications (user interfaces, APIs and back-end services).
- Excellent communication skills with emphasis on writing detail-oriented documents and communications.
- Strong understanding of object-oriented programming concepts.
- Strong understanding of web UI/API and services automation testing (Selenium WebDriver/Selenide, RestAssured).
- Experience using BDD approach
- Experience working with a Linux-based laptop
- Experience with continuous integration tools, such as Jenkins.
- Shifted working hours 12pm till 8pm EEST timezone (nice to have)

Nice to have:

- Experience with the Ad Tech industry.
- Familiarity with clustered computing, distributed and parallel computing concepts.

Job Responsibilities

- Be a creative problem-solver who can draw on an array of expertise and technology to design and implement reliable, scalable and maintainable solutions to challenging problems
- Write production-ready code and unit tests that meet both system and business requirements (Java)
- Respond to feature requests, bug reports, performance issues and ad-hoc questions
- Work collaboratively with multiple teams to deliver quality software
- Support operation of services in production
- Perform code reviews and design reviews

Department/Project Description

Founded in 2007, Magnite’s pioneering technology created a new model for the advertising industry. Today, our automated advertising platform is used by the world’s leading publishers and applications to transact with top brands around the globe enabling them to reach more than 1 billion consumers. Magnite operates the largest independent Display Advertising Exchange and Supply Side Platform that automates the buying and selling of Display Advertising across all formats (banner, video) on all devices (desktop browsers, mobile devices, billboards). Magnite auctions over 20 Billion Ads on a daily basis in real time in less than 1/2 of a second each. Magnite is a publicly traded company (NYSE: RUBI) headquartered in Los Angeles, California, USA.

Workload: full-time, remote
Start: asap
Duration: long-term
Location: any
English: B2

Technical requirements (general)
- 3+ years of production blockchain experience in BTC. Multi-protocol experience (strongly preferred).
- Java + Spring Boot + SQL
- Familiarity with test-driven development (TDD) and/or behaviour-driven development (BDD) as working practices, writing tests before or alongside implementation.
- Familiarity with Domain-Driven Design principles.
- Comfortable working in a monorepo structure with shared libraries, cross-squad code visibility, and coordinated CI/CD pipelines.
- Proactive communication, raising blockers, design concerns, and cross-squad dependencies.
- Written and verbal communication in English must be at a professional level.

Technical requirements (specific)
- Deep Bitcoin protocol expertise: PSBT format (BIP-174 and subsequent updates), UTXO management and coin selection algorithms, SegWit transaction structures, script types and descriptor formats (Taproot out of scope).
- Multi-signature coordination: BIP-48 (multi-sig derivation paths), BIP-67 (lexicographic key sorting), P2WSH script construction, PSBT combination and finalisation workflows.
- Fee estimation: Mempool analysis, RBF (Replace-By-Fee) and CPFP (Child-Pays-For-Parent) fee bumping strategies, fee rate prediction.
- Transaction construction: Witness data assembly, BIP-143 (SegWit sighash), DER signature encoding, low-S enforcement. Familiarity with sighash types. SIGHASH_ALL is the production default for custody; engineers should understand the full sighash taxonomy for validation and edge-case handling but implementation focuses on SIGHASH_ALL.
- Transaction lifecycle and remediation: Stuck transaction detection via mempool monitoring, RBF and CPFP execution for fee bumping, handling transactions that remain unconfirmed for extended periods, and managing the operational decision of when to replace vs wait.
- UTXO indexing and balance management: Experience with UTXO set tracking, balance computation from unspent outputs, UTXO consolidation strategies during low-fee windows, and address-level balance monitoring for deposit detection.
- Address management: Gap limit handling for HD wallets, change address allocation from internal derivation branch (m/84'/0'/0'/1/*), address reuse prevention, and descriptor-based address discovery for wallet import and recovery scenarios.
- Chain semantics and failure modes: Understanding of Bitcoin's probabilistic finality (confirmation depth vs settlement assurance), dust output limits and their implications for UTXO management, fee spike behaviour during congestion events (e.g. ordinals, inscription surges filling blocks for extended periods), double-spend detection for unconfirmed transactions, and the operational difference between a transaction that is "broadcast" vs "in mempool" vs "confirmed at depth N." Engineers must understand that Bitcoin has no concept of a "failed" transaction that consumes fees; a transaction either confirms or it doesn't, and unconfirmed transactions can be replaced or may eventually confirm unexpectedly.
- Production experience: Operating Bitcoin custody or wallet infrastructure at institutional scale, not testnet-only or personal wallet experience.

Candidate's responsibilities
Bitcoin wallet management, UTXO handling, transaction construction (PSBT, SegWit), multi-signature coordination, fee estimation.

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.

🚀 AIMPROSOFT is looking for a Full-Stack Java Developer (ReactJS/Spring Boot)! 

Aimprosoft, a fast-growing IT company, is looking for a Full-Stack Java Developer (ReactJS/Spring Boot) on a contract basis (≈ 2+ months) for an international Telecom project. 

This is a hands-on backend role focused on building a Service Integration Layer for a UK broadband and telecom wholesale operator. The platform will orchestrate VOIP and hardware service fulfilment between the client’s commercial order management system and downstream suppliers. 

You will join the project at the MVP stage and contribute to an intensive 8-week Phase 0 proof of capability. The role is a strong fit for an engineer who is comfortable working with backend integrations, long-running workflows, AWS services, and evolving technical specifications. 

🎯 About the project & role: 

The Service Integration Layer will manage complex order journeys across the client’s wholesale carrier ecosystem. Its responsibilities include service qualification, VOIP ordering, supplier orchestration, inventory updates, status tracking, and reliable recovery of interrupted processes. 

You will: 

• Implement Service Qualification and Service Order APIs using Java and Spring Boot  
• Build an adapter for integration with an external VOIP and hardware supplier  
• Implement six supplier operations covering customer, subscription, user, and phone-number provisioning  
• Embed and configure a workflow engine such as Camunda, Flowable, jBPM, or a similar solution  
• Implement long-running workflows with timers, persisted state, retries, compensation, and recovery  
• Ensure reliable asynchronous processing through idempotency, correlation IDs, timeouts, and error handling  
• Build mocks and stubs for external systems to keep development independent of third-party sandbox availability  
• Implement a minimum read-only Service Inventory and catalogue configuration  
• Produce OpenAPI documentation and maintain a clear variance log for differences between the specification and implemented contracts  
• Demonstrate durable order persistence and clean workflow recovery after an intentional mid-process restart  
• Collaborate with the Architect, QA, DevOps, and Project Manager throughout implementation  

All development will take place inside the client’s AWS account, repositories, and CI/CD environment.  

🔥 What We Need From You: 

• 5+ years of commercial Java development experience  
• Strong hands-on experience with Spring Boot 
• Commercial experience with ReactJS and the ability to develop and maintain frontend components integrated with Java/Spring Boot APIs 
• Upper-Intermediate+ (B2+) English level 
• Experience building REST APIs and integration-heavy backend services  
• Solid understanding of REST and JSON API design and consumption 
• Experience integrating with at least one non-trivial third-party API  
• Practical knowledge of retry strategies, timeout handling, error processing, and idempotency  
• Experience with long-running or stateful business processes using workflow engines, sagas, or state machines  
• Understanding of asynchronous and event-driven integration patterns  
• Experience with microservice architecture  
• Familiarity with OAuth2-secured APIs  
• Practical AWS experience, particularly with services such as API Gateway, ECS/Fargate, Lambda, AWS OpenSearch, RDS, SQS, or EventBridge. 
• Basic understanding of infrastructure managed with Terraform  
• Ability to work effectively with evolving specifications, identify ambiguities, and raise them as tracked risks  

• Ability to deliver in a fast-paced, fixed-deadline environment  

   

📌 Nice to have: 

• Experience with TM Forum Open APIs  
• Background in telecom OSS/BSS integrations 
• Hands-on experience with Camunda 8 SaaS, Flowable, jBPM, or another BPM/workflow engine  
• Experience embedding or operating a workflow engine as part of a Java application  
• Understanding of process definitions, timers, compensation, and workflow state persistence  
• Understanding of telecom order lifecycle, service qualification, inventory, or provisioning processes  
• Experience with transactional outbox, idempotent consumers, correlation IDs, and recovery patterns  
• Experience working with Apache Kafka or RabbitMQ  
• Knowledge of AWS Secrets Manager  
• Experience working on fixed-scope or fixed-deadline delivery projects  
• Experience producing OpenAPI documentation and supporting Postman-based integration testing  
• Bachelor’s or Master’s degree in Computer Science or a related field  

💼 What We Offer: 

• Official military deferment (reservation); 
• A competitive salary that appreciates your skills and experience; 
• Opportunity to join a strategically important pilot team with long-term project prospects 
• Work on modern cloud-native products that deliver real-world impact 
• Exposure to AI-powered development practices and enterprise-scale engineering 
• Open environment where your ideas, technical expertise are valued 

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 Strong Junior 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 80/20 office/home format until the end of 2026. Starting from 2027, the policy will transition to primarily office-based work, with up to 10 work-from-home days per year with manager approval.
• 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

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.
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.

Project description

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

Skills

Must have

Strong knowledge of Big Data technologies Hadoop Ecosystem (HDFS, Impala, HIVE, HBASE, etc.) and Apache Spark

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

Nice to have

Experience In-memory databases and caching

Job Orchestration tools like Autosys or Airflow

Apache Spark

Financial background (where possible)

Languages

English: C1 Advanced

About the Role 
We're looking for a  Backend Developer to design and build the backend of our products — REST APIs, services, and AI integrations from data model to production. You'll own features end-to-end, contribute to architectural decisions, and occasionally jump into the React frontend when it makes sense.

What You'll Do

• Design, build, and maintain backend services and REST APIs for our products – from data model through to production.
• Integrate AI / LLMs into product features.
• Design and implement clean, well-documented REST APIs (contract-first where it fits).
• Write maintainable, testable code with strong unit and integration test coverage.
• Take part in code reviews, both giving and receiving constructive feedback.
• Collaborate closely with product managers, designers, frontend engineers, and QA in an Agile team.
• Investigate and resolve bugs, and help improve performance and reliability.
• Contribute to technical and architectural decisions.
• (A plus) Occasionally contribute to the React frontend when a feature spans the stack.
   

What We're Looking For

Must-have (backend):

• 3+ years of commercial backend development experience in Java.
• Strong Java Core; hands-on experience with Spring Boot (Spring MVC, Spring Data JPA, Hibernate), Spring Security, and Spring AOP.
• Familiarity with MapStruct for entity-to-DTO mapping and Lombok.
• Practical experience designing and consuming RESTful services.
• Good SQL skills with a relational database (PostgreSQL); schema migrations with Flyway.
• Understanding of OAuth2 / JWT-based authentication and role-based access control.
• Comfortable with Docker and Docker Compose.
• Confident with Git and a standard branching workflow; familiarity with Gradle.
• Experience writing unit and integration tests (JUnit, Testcontainers).
• Genuine interest in integrating AI / LLMs into product features.
• Solid understanding of OOP, web fundamentals, and clean-code principles.
• English at Upper-Intermediate (B2) level — able to communicate in writing and on calls.
   

A big advantage:

• Frontend experience with React — JavaScript/TypeScript, HTML, CSS/SCSS, and the modern React ecosystem: client state (Zustand), server state / data fetching (TanStack Query), routing (React Router), and a modern build tool (Vite).
• Hands-on experience integrating AI / LLMs into real product features.
• Contract-first / OpenAPI workflow — OpenAPI 3 with code generation (openapi-generator).
• Experience integrating an identity provider such as Keycloak.
• AWS exposure (EC2, RDS, CloudWatch) and structured (JSON) logging.
• End-to-end testing with Playwright.

Our client is one of the leading companies on the market which provides Big Data, Data Integration, Data Preparation and Enterprise Application Integration software and services. Its products allow to build data integration process, migrate data safely, process big amount of data, cleanse data and check its quality.

Connector (aka Component) is a core element of the products, which allows to connect, extract data from a data source, transform data according to business needs and load data back to some storage. It is used in traditional software such as Studio for Data Integration as well as in the modern Cloud services.

Continuous emerging of new technologies and data repositories lead to demand growth of creating new connectors and adapting the existing ones.

For this reason, we are looking for a Junior Java developer to join the team to address the demand and provide our client with the best quality service.
 

Requirements:

• Good knowledge of Java Core 8
• Some experience with SQL (knowledge of JDBC is a huge plus)
• Understanding and some experience in testing techniques (JUnit)
• English (both spoken and written) at least at Intermediate level that allows communicating with an international team on a daily basis

 Optional but desirable:

• Pet projects on Java Core
• Knowledge of JSON, XML
• Knowledge or experience with development and CI tools: Git/GitHub, Maven, Docker

Job responsibilities:

• Design and implement Talend Connectors
• Unit and Integration testing
• Respond to feature requests, bug reports, performance issues and ad-hoc questions

Advantages:

• Smooth onboarding process
• Working under the supervision of a skilled teammate
• Chance to work with a great variety of technologies and DBs (both SQL and non-SQL such as Snowflake, PostgreSQL, Mongo, Cassandra, DynamoDB, Neo4j)
• Work collaboratively in a distributed international team (France, Germany, China)

Please provide your CV and LinkedIn profile. We demand your LinkedIn profile with actual working experience to move forward with your application!

Fundomate is looking for a Senior Java Back-End Developer to join our team. Fundomate is an innovative fintech company operating in the alternative lending space and providing both direct-to-business and white-label turnkey solutions.

You will be good match if:

- You have history of solving non trivial problems in one of your previous projects

- You have wide technology background (backend, frontend, devops, ops, mobile development, etc), so you will understand the connections between technologies and expand this knowledge with domain and business needs. 

- You have experience working in US fintech domain 

We will be good match if:

- You want to solve (or learn to solve) complex business problems

- You want to experiment with processes/development technics/tools

- You are interested in continuous improvement and automation of product and working process

Requirements:

- 6+ years of experience developing web applications

- 3+ years of experience in any IoC & DI framework (Spring, Quarkus, Micronaut, etc.)

- TDD experience in production is a must have

- Experienced in pair programming

- Good knowledge of MicroServices (Kubernetes knowledge is a plus)

- Experience working with tools like Git, Gradle, Jenkins or similar CI/CD

- Working experience in Industry Standard protocols related API Security including OAuth (KeyCloak is a plus)

- Working experience with RDBMs like Postgres/MySQL or any similar

- Understanding of asynchronous message-based communication like Kafka, GCP Pub/Sub, AWS SNS/SQS, etc. (Kafka as an advantage)

- Strong Agile/Scrum/Kanban development experience

- Experience in third party systems integration (XML or JSON api)

- Knowledge of any cloud provider (AWS as an advantage)

Our technical Stack:

- Java 25

- Microservices (Quarkus)

- Postgresql/MySQL

- Kafka

- Keycloak

- Kubernetes & Docker

- AWS (EKS, MSK, RDS, etc.)

- Gradle

- Bitbucket pipelines, gitops approach

- Lombok, MapStruct, Flyway

We offer:

- Innovative product with modern technology stack

- Competitive salary (paid in $)

- Social package (paid vacations, sick leaves and etc)

- PE accounting and support

- WFH and remote working mode possibility, Ukrainian working hours

- No bureaucracy, micromanagement and time-tracking