Jobs Java

The Mission

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

The Role

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

Tasks

Your Impact

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

Requirements

What You Bring to the Table

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

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

   

  Benefits:

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

Project description

We are building the platform, which supports various information gathering and processing across the bank. The PMC application, Price Master Central (PMC) is a global reference data management application - responsible for sourcing securities/Pricing data from market vendors and internal sources and providing it to downstream clients after applying client specific rules.

Responsibilities

Manage a team

Intensive communication with project stakeholders and other teams

Evaluate and adopt new development tools, libraries and approaches to improve delivery quality

Continuous quality improvement (code reviews, fixing Sonar issues, unit/integration/E2E test coverage)

Integrate our components with different internal and external client's systems

Configure, monitor, and troubleshoot Application servers

Monitor applications, processes, scheduled jobs, collect different types of logs and metrics

Setup and improve CI/CD

Automate routine with scripting languages

Write all types of tests: unit, integration, end-to-end

Design distributed applications

Skills

Must have

Technically strong energetic individual, who can bring innovation to the group

Team lead experience from 3 years, IT experience from 7 years

Java (Core, JDBC, MT, Collections, I/O), Spring Boot

SQL.PL-SQL on Oracle DB

Container platform based on Kubernetes

REST web services, Kafka, Redis

Unix Commands and shell scripting.

Familiarity with standard data structures and algorithms.

Experience using the following tools

JIRA, Harness/uDeploy, SonarQube, TeamCity, Artifactory, Git (GHE & Bitbucket)

Logical thinking, strong analytical and problem-solving skills; innovate and solutions oriented

Effective time management skills to manage multiple priorities with flexibility on time zones and timelines

Excellent verbal and written communication skills

Bachelor's degree in computer science or equivalent work experience

Nice to have

Master's degree in computer science or equivalent work experience

Experience working with the Scrum methodology

Experience working with a NoSQL database

Experience designing and implementing microservices

Financial services technology experience preferably in reference data

Languages

English: C1 Advanced

About Us: InnovatelU is a dynamic tech company delivering cutting-edge solutions. We're looking for a passionate Java Developer to join our team. If you have a solid Java foundation, are eager to grow, and learn quickly, we want to hear from you! 

Requirements: 
- Strong knowledge of Java 
- Knowledge of Spring (Spring Core, Spring AOP, Spring MVC, Spring Security, Spring Boot) 
- Familiarity with REST APIs, web services 
- Proficiency in version control tools (Git) 
- Experience with build tools like Maven and Gradle 
- Experience with relational databases (PostgreSQL) 
- Expertise in containerization (Docker) 

- Experience in unit and integration testing 
- Strong communication skills and teamwork ability 
- English level: Intermediate or higher 

Will Be a Plus: 

- Solid understanding of design patterns 

- Experience with NoSQL databases like MongoDB and Redis 

- Familiarity with messaging systems like Kafka and RabbitMQ 

- Experience with microservices architecture 

Responsibilities: 

- Collaborate with senior developers and project managers 

- Assist in designing, coding, and testing applications 

- Write well-designed, efficient, and testable code 

- Participate in code reviews 

- Debug and resolve technical issues 

- Contribute to application documentation 

Interview Stages: 

1. Test Task: 1 hour 

2. HR Interview: 30 minutes 

3. Technical Interview: 1 hour 

We Offer: 

- Full Remote 

- Constant support and mentoring 

- Paid 5 working days of sickness per a year; 

- Paid all official Ukrainian holidays; 

- 18 working days of vacation per a year; 

- Opportunity for professional growth and career development 

If this sounds interesting to you, let's talk!

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 are looking for a Senior Backend Software Engineer to join the B2B Portals Team working with Raisin, a fintech company operating a digital savings and investment marketplace.

You will contribute to partner-facing platforms that allow banks, brokers, and financial advisors to offer Raisin deposit products to their customers. The team owns the full development lifecycle - from solution design and implementation to deployment and production support.

Responsibilities:

• Develop and maintain backend services using Java and Spring Boot;
• Deliver features from technical design to production rollout;
• Build APIs and integrations for banks and other B2B partners;
• Write unit, integration, and contract tests;
• Investigate production issues using logs, metrics, and traces;
• Conduct code reviews and contribute to engineering standards;
• Improve service performance, security, and reliability;
• Participate in the team’s on-call rotation;
• Mentor engineers and support knowledge sharing;
• Promote the effective and safe use of AI-assisted development tools;
• Collaborate with distributed teams and stakeholders across Europe and the US.

Requirements:

• 5+ years of commercial Java development experience;
• Strong knowledge of Java, Spring Boot, and Spring Data;
• Experience with AWS and cloud-based applications;
• Experience with REST APIs, distributed systems, and service integrations;
• Knowledge of relational databases, preferably MySQL;
• Experience with asynchronous messaging, particularly Amazon SQS;
• Strong testing skills with JUnit and Testcontainers;
• Experience with CI/CD, Docker, and Kubernetes;
• Ability to independently own and deliver backend features;
• Experience debugging production systems;
• Mentoring and code review experience;
• Fluent English.

Nice to have:

• Experience with fintech or banking integrations;
• Knowledge of Pact contract testing;
• Experience with Apache Kafka or Amazon MSK;
• Experience with event-driven systems;
• Experience with OpenTelemetry, Datadog, or Splunk;
• Familiarity with GitLab CI/CD, Harness, Amazon EKS, or Airflow;
• Experience with multi-tenant B2B platforms;
• Practical experience with AI-assisted development tools.

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

Description

Our client is an innovative manufacturer of medical devices in the United States, producing devices and software applications.

In this project, you will have a great opportunity to be involved in the full development life cycle of medical software, which is designed to assist individuals by processing information from medical devices to identify health trends and track daily activities. In addition, there are opportunities to work with medical devices, in the scope of end-to-end testing.

Requirements

• Minimum of 5 years of experience in software development, with a focus on designing and implementing highly scalable web applications, data pipelines, and cloud-based microservices
• Proficiency in Java programming language and related technologies. Experience with frameworks such as Spring, Hibernate, and cloud-native services is highly desirable
• Strong understanding of database concepts and experience with SQL and NoSQL databases (e.g., MySQL, DynamoDB, Redis).
• Familiarity with cloud platforms (AWS) and experience deploying applications in cloud environments is advantageous
• Experience with microservices and event-driven architectures
• Strong analytical and problem-solving skills with the ability to troubleshoot complex issues and implement effective solutions
• Excellent written and verbal communication skills with the ability to articulate technical concepts clearly and effectively

• Ability to work both independently and collaboratively in a fast-paced, agile environment. Strong team player with a positive attitude and a passion for technology

  #LI-MP2
  #LI-Remote

We are building the platform, which supports various information gathering and processing across the bank. The PMC application, Price Master Central (PMC) is a global reference data management application - responsible for sourcing securities/Pricing data from market vendors and internal sources and providing it to downstream clients after applying client specific rules.

• Responsibilities:

  - Manage a team
  - Intensive communication with project stakeholders and other teams
  - Evaluate and adopt new development tools, libraries and approaches to improve delivery quality
  - Continuous quality improvement (code reviews, fixing Sonar issues, unit/integration/E2E test coverage)
  - Integrate our components with different internal and external client's systems
  - Configure, monitor, and troubleshoot Application servers
  - Monitor applications, processes, scheduled jobs, collect different types of logs and metrics
  - Setup and improve CI/CD
  - Automate routine with scripting languages
  - Write all types of tests: unit, integration, end-to-end
  - Design distributed applications

• Mandatory Skills Description:

  - Technically strong energetic individual, who can bring innovation to the group
  - Team lead experience from 3 years, IT experience from 7 years
  - Java (Core, JDBC, MT, Collections, I/O), Spring Boot
  - SQL.PL-SQL on Oracle DB
  - Container platform based on Kubernetes
  - REST web services, Kafka, Redis
  - Unix Commands and shell scripting.
  - Familiarity with standard data structures and algorithms.
  - Experience using the following tools - JIRA, Harness/uDeploy, SonarQube, TeamCity, Artifactory, Git (GHE & Bitbucket)
  - Logical thinking, strong analytical and problem-solving skills; innovate and solutions oriented
  - Effective time management skills to manage multiple priorities with flexibility on time zones and timelines
  - Excellent verbal and written communication skills
  - Bachelor's degree in computer science or equivalent work experience

• Nice-to-Have Skills Description:

  - Master's degree in computer science or equivalent work experience
  - Experience working with the Scrum methodology
  - Experience working with a NoSQL database
  - Experience designing and implementing microservices
  - Financial services technology experience preferably in reference data

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment

Ajax Systems, an international tech company and the largest manufacturer of security systems in Europe.

We are looking for a new team member to join our System devisions as a Senior Java Developer.

The System Division is responsible for building and developing the Ajax software ecosystem. The team develops and maintains OS Malevich and the Video Management System, builds scalable cloud infrastructure, and creates client applications for multiple platforms, ensuring that all system components work together as a unified ecosystem.

The division works with Java, Kotlin, Swift, C, C++, and Python. It includes embedded, cloud, mobile, and desktop engineers who ensure the stable operation of Ajax as a single digital platform.

Responsibilities:

Core Development:

• Design and implement core backend services and data pipelines
• Write clean, readable, and maintainable code
• Develop services for the b2b product line

Architecture & Documentation:

• Actively participate in developing and improving architecture
• Document architectural decisions and operational knowledge for successful deployment and service operations

Quality Assurance:

• Ensure appropriate test coverage with unit and integration testing
• Focus on performance and cost efficiency for areas of responsibility
• Follow best practices in software design and development and promote them within the team

Operations & Monitoring:

• Ensure reliable alerting, dashboards, and runbooks for production services
• Debug production issues, analyze complex cases, and conduct investigations

Collaboration & Culture:

• Work smoothly in a technical culture with testing, CD, and DevOps

• Collaborate within the team and with other engineering teams to develop new features and products according to business needs

   

Requirements:

• Java: 3+ years of professional backend development in enterprise environment
• Kotlin: Knowledge and practical work experience
• Java Concurrency: Strong understanding and practical application experience
• Understanding of SOA, microservice, and event-driven architecture
• Cloud development principles with practical AWS experience

• Ability to scale and ensure high availability of loaded systems

   

Required:

• Any NoSQL database
• Any message broker
• Enterprise-grade stack (messaging brokers, in-memory storages, NoSQL, key-value databases)
• Docker and Kubernetes (containerized applications)

• Git, Gradle, Jenkins

   

Nice to Have:

• Redis, Netty, Akka, gRPC, Project Reactor, NATS, Kafka. MongoDB

• Strong knowledge of unit testing and automated test paradigms

   

We offer:

• The opportunity to suggest and implement your own ideas that directly influence the product and its mass production
• A place in a fast-growing company with a motivated and professional team
• Competitive salary
• Medical insurance
• English classes
• The opportunity to participate in Ajax’s internal beta-testing program for security systems
• Discounts from partner companies

• Discounts on Ajax products

   

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

Project description

Developed product is the leading software system in Energy domain covering all aspects of Oil&Gas production from geological exploration to optimization of ongoing production. Our technology solution helps geologists and geophysicists to research, visualize and interpret large volumes of geological data.
Our project is stable, long-term and constantly adopts new technologies such as Java 11, Cloud and GPU computing.
Work supposes close cooperation with Customer team located in Houston and following Agile principles.
Our team is senior, supportive and friendly.

Responsibilities

Learn technologies used on the project;

Explore existing code base;

Start performing project tasks.

Skills

Must have

Strong Java Core;

Algorithms: sorting, optimization;

Intermediate English.

Nice to have

Experience in desktop applications development using Java.

Git repository link of candidate's work would be helpful.

• The project focuses on developing advanced software solutions for the oil and gas industry, supporting key stages of the reservoir lifecycle, including exploration, development, production, operations, maintenance, and abandonment.
  
  The successful candidate will join the Information Management and Platform Technologies Development team and contribute to the design and development of next-generation software products. The role offers an opportunity to work with modern technologies, apply innovative ideas, and build solutions used in complex energy industry environments.

   

• Responsibilities:

  Key Responsibilities/Accountabilities:
  - Knowledge of software engineering best practices (including requirements analysis, system design, modularity, version control, testing, documentation, etc.) for productivity, collaboration, quality, and maintainability.
  - Knowledge of how a component fits into a larger ecosystem of products and services.
  - Understanding of how these different pieces work together, and communicate with them (using library calls, REST APIs, database queries, etc.)
  - Know how to build appropriate interfaces for components that others will depend on. Knowledge of basic system design patterns to avoid bottlenecks and let your algorithms scale well with increasing volumes of data.
  - Perform research and development tasks.
  - Expected to design, code, test, do troubleshooting and document engineering systems applications by following the software development lifecycle.
  - Accomplishes engineering and organization mission by completing related results as needed.
  - Updates job knowledge by studying state-of-the-art development tools, programming techniques, and computing equipment; participating in educational opportunities; reading professional publications; participating in professional organizations.

   

• Mandatory Skills Description:

  - Degree in Computer Science, Engineering, or equivalent. Master's preferred
  - Software Development Fundamentals
  - Strong understanding of Object-Oriented Design and Principles
  - 5+ years of professional experience with Java and Angular
  - Build & CI/CD: Git Ci/CD, Helm
  - Database background: Posgtess
  - REST API Express
  - Hapi
  - Self-motivated
  - Problem Solving skills
  - Works well within a team
  - Excellent communication skills

   

• Nice-to-Have Skills Description:

  - Web front-end technologies and tools: HTML5, CSS, SASS, JavaScript, Angular 16+, Angular CLI, Typescript, NPM, and VS Code.
  - Web back-end technologies: RESTful APIs using Microservices (NodeJS, C#, C++, Python), Express, JSON, OData, Web Sockets, and Java EE.
  - Testing: JEST, Karma/Jasmine, E2E testing with Protractor.
   MAVEN, Jenkins & Ansible, Containerization.
  - Cloud: Knowledge in cloud technologies (Azure and Amazon)

   

• Languages:

  • English: B2 Upper Intermediate

     

• Processing Steps

  CVR -> TI1(Java) -> TI2(Angular) -> PMI -> CLCVR -> CLI

• Developed product is the leading software system in Energy domain covering all aspects of Oil&Gas production from geological exploration to optimization of ongoing production. Our technology solution helps geologists and geophysicists to research, visualize and interpret large volumes of geological data.
  Our project is stable, long-term and constantly adopts new technologies such as Java 11, Cloud and GPU computing.
  Work supposes close cooperation with Customer team located in Houston and following Agile principles.
  Our team is senior, supportive and friendly.

   

• Responsibilities:

  - Learn technologies used on the project;
  - Explore existing code base;
  - Start performing project tasks.

   

• Mandatory Skills Description:

  - Strong Java Core;
  - Algorithms: sorting, optimization;
  - Upper Intermediate English.

   

• Nice-to-Have Skills Description:

  Experience in desktop applications development using Java.
  Git repository link of candidate's work would be helpful.

   

• Languages:
  • English: B2 Upper Intermediate

The project focuses on developing advanced software solutions for the oil and gas industry, supporting key stages of the reservoir lifecycle, including exploration, development, production, operations, maintenance, and abandonment.

The successful candidate will join the Information Management and Platform Technologies Development team and contribute to the design and development of next-generation software products. The role offers an opportunity to work with modern technologies, apply innovative ideas, and build solutions used in complex energy industry environments.

• Responsibilities:

  Key Responsibilities/Accountabilities:
  - Knowledge of software engineering best practices (including requirements analysis, system design, modularity, version control, testing, documentation, etc.) for productivity, collaboration, quality, and maintainability.
  - Knowledge of how a component fits into a larger ecosystem of products and services.
  - Understanding of how these different pieces work together, and communicate with them (using library calls, REST APIs, database queries, etc.)
  - Know how to build appropriate interfaces for components that others will depend on. Knowledge of basic system design patterns to avoid bottlenecks and let your algorithms scale well with increasing volumes of data.
  - Perform research and development tasks.
  - Expected to design, code, test, do troubleshooting and document engineering systems applications by following the software development lifecycle.
  - Accomplishes engineering and organization mission by completing related results as needed.
  - Updates job knowledge by studying state-of-the-art development tools, programming techniques, and computing equipment; participating in educational opportunities; reading professional publications; participating in professional organizations.

• Mandatory Skills Description:

  - Degree in Computer Science, Engineering, or equivalent. Master's preferred
  - Software Development Fundamentals
  - Strong understanding of Object-Oriented Design and Principles
  - 5+ years of professional experience with Java and Angular
  - Build & CI/CD: Git Ci/CD, Helm
  - Database background: Posgtess
  - REST API Express
  - Hapi
  - Self-motivated
  - Problem Solving skills
  - Works well within a team
  - Excellent communication skills

Domain: Banking & Finance
Experience: 5+ years
Project Duration: August, 2026 – November, 2026(to be extended))
Format: Hybrid
Location: Kraków, Poland

About the Project

We are looking for a Java Developer with React experience to join a team developing and supporting modern, production-grade applications within the banking and finance domain.

The role combines backend development with Java, frontend development with React, API integration, and database technologies. The selected specialist will contribute to system design, application improvements, automation initiatives, and the delivery of scalable and reliable technical solutions.

Responsibilities

• Contribute to software architecture and system design initiatives
• Lead UI enhancements and improvements to strengthen user experience and application reliability
• Develop solutions in line with established design patterns and engineering best practices
• Analyze business and technical requirements and recommend effective, scalable solutions
• Create clear, detailed, and maintainable technical documentation for applications and services
• Build prototypes and proof-of-concepts to validate technical ideas, designs, and approaches
• Manage application and infrastructure changes throughout the service management lifecycle
• Drive automation initiatives and continuous improvements across service management processes
• Provide timely customer support by troubleshooting and resolving technical issues
• Collaborate closely with customers and stakeholders to understand requirements and deliver suitable technical solutions

Requirements

• 5+ years of hands-on experience developing production-grade applications within the Java ecosystem, including frontend development with React
• Strong expertise in Java development and Web API implementation
• Experience building scalable, secure, and high-performance backend systems
• Strong troubleshooting and problem-solving skills, particularly in fast-paced or high-pressure production environments
• Solid database design and SQL expertise, especially with SQL Server
• Advanced experience with T-SQL scripting, query optimization, and performance tuning
• Practical experience with DevOps practices, including CI/CD
• Strong understanding of the full Software Development Life Cycle (SDLC), including requirements analysis, system design, development, testing, deployment, and maintenance
• Excellent analytical skills, attention to detail, and the ability to solve complex technical challenges
• Strong communication and collaboration skills across technical and non-technical teams
• Fluent English

Tech Stack

• Java
• React
• Web APIs
• API Governance & Integration
• SQL Server
• SQL / T-SQL
• PL/SQL
• DevOps
• CI/CD
• SDLC

Location

• Hybrid from Kraków, Poland
• Important: the client requires office visits in Kraków 8 times per month

We are looking for a Blockchain Developer to join a long-term project focused on institutional digital asset and Bitcoin wallet infrastructure.

The role is focused on building and supporting secure Bitcoin-related solutions, including transaction processing, UTXO management, multisig and wallet infrastructure.

Requirements

• 3+ years of production experience in blockchain development, with strong hands-on experience with Bitcoin
• Strong understanding of the Bitcoin network and transaction lifecycle
• Experience with UTXO management and manual transaction construction
• Strong knowledge of PSBT, SegWit, Bitcoin Script and address types
• Experience with multisig wallets
• Understanding of fee estimation, RBF and CPFP
• Experience with Bitcoin wallet or custody infrastructure
• Strong Java, Spring Boot and SQL
• Familiarity with TDD and/or BDD
• Understanding of Domain-Driven Design principles
• Experience working with monorepos and CI/CD pipelines
• Good communication skills and ability to work in a cross-functional team
• English — B2 or higher

Responsibilities

• Develop and maintain Bitcoin wallet infrastructure
• Work with UTXO management and transaction construction
• Implement and support PSBT, SegWit and multisig workflows
• Work with transaction fees, RBF and CPFP
• Contribute to backend architecture and integrations with Bitcoin nodes
• Monitor and troubleshoot production issues
• Participate in technical design and development of new features
• Collaborate with other engineers across the project

What we offer

• Full-time, remote position
• Long-term cooperation
• Flexible location within the EU, with a particular focus on Ukraine and the Balkans
• Opportunity to work on institutional-grade blockchain infrastructure
• Start: ASAP