Jobs Java

N-iX is looking for Senior Full-Stack developer (Java+React/Angular) to join our team. 

About the Role
Our client is looking for a Java Full‑Stack Developer to help accelerate product development for their flagship workforce management solution, HotSchedules Labor. You’ll work in a collaborative, international team with developers and QA engineers from Ukraine, Latin America, and the US. This role offers a great opportunity to strengthen your English skills, as many team meetings are held in English.

The team actively uses AI coding agents to speed up development and improve code quality. Candidates must be comfortable working with AI tools as part of their daily workflow.

Most engineers on the team are full‑stack developers, but current priorities lean more toward backend tasks. A solid background in backend development combined with practical front‑end experience (React 18, Redux) is required.

Responsibilities

• Develop new features based on the product backlog
• Build REST services for high-volume, low-latency web and mobile applications
• Design and implement database schema changes (MS SQL Server) and maintain Flyway migrations
• Maintain and refactor existing codebases, including legacy Backbone.js modules
• Troubleshoot and resolve production issues
• Collaborate with cross-functional teams to define, design, and deliver new features
• Leverage AI coding agents to accelerate development and enhance code quality
• Participate in code reviews and contribute to engineering best practices

Requirements

• Minimum 5 years of hands-on experience with Java
• At least 6 months of daily experience using AI coding agents (e.g., Claude Code, GitHub Copilot, Cursor) 
• Strong proficiency in the Spring Framework (Spring MVC, Spring Security, Spring JDBC)
• Experience with MS SQL Server and Flyway database migrations
• Practical experience with React 18/Angular, including Redux and component libraries (Material UI or similar)
• Experience with the Gradle build system
• Experience with AWS (S3, SQS, DynamoDB, Lambda) and Azure (Service Bus, Blob Storage) is a plus
• Working knowledge of Docker and Kubernetes is a nice-to-have
• Upper‑intermediate English or higher

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

N-iX is looking for Senior Java Engineer (with React/Angular experience) with AI to join our team. 

About the Role
Our client is looking for a Java Full Stack Engineer with AI to help accelerate product development for their flagship workforce management solution, HotSchedules Labor. You’ll work in a collaborative, international team with developers and QA engineers from Ukraine, Latin America, and the US. This role offers a great opportunity to strengthen your English skills, as many team meetings are held in English.

The team actively uses AI coding agents to speed up development and improve code quality. Candidates must be comfortable working with AI tools as part of their daily workflow.

Most engineers on the team are full‑stack developers, but current priorities lean more toward backend tasks. A solid background in backend development combined with practical front‑end experience (React 18, Redux) is required.

Responsibilities

• Develop new features based on the product backlog
• Build REST services for high-volume, low-latency web and mobile applications
• Design and implement database schema changes (MS SQL Server) and maintain Flyway migrations
• Maintain and refactor existing codebases, including legacy Backbone.js modules
• Troubleshoot and resolve production issues
• Collaborate with cross-functional teams to define, design, and deliver new features
• Leverage AI coding agents to accelerate development and enhance code quality
• Participate in code reviews and contribute to engineering best practices

Requirements

• Minimum 5 years of hands-on experience with Java
• At least 6 months of daily experience using AI coding agents (e.g., Claude Code, GitHub Copilot, Cursor) 
• Strong proficiency in the Spring Framework (Spring MVC, Spring Security, Spring JDBC)
• Experience with MS SQL Server and Flyway database migrations
• Practical experience with React 18, including Redux and component libraries (Material UI or similar)
• Experience with the Gradle build system
• Experience with AWS (S3, SQS, DynamoDB, Lambda) and Azure (Service Bus, Blob Storage) is a plus
• Working knowledge of Docker and Kubernetes is a nice-to-have
• Upper‑intermediate English or higher

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

Required Skills:

— At least 3 years of experience developing using the Java language.

— Experience with Spring Framework and application design patterns (Core, MVC, Security, Data).

— Experience with RDBMS and ORM.

— Experience with Docker, Jenkins, Maven, Tomcat.

— Experience with development and maintenance of REST API.

— Experience with frontend technologies (JavaScript, HTML, CSS).

— Experience with GIT and version control.

— Ability to work independently or collaboratively as needed.

— Effective English and communication skills.

— Excellent analytical and problem-solving skills.

— Well organized, self-motivated, quick learner and curious about how systems work and how they fail.

As a Plus:

— Experience with microservices (Spring Cloud)

— Great potential and willing to learn

— Passionate about software development;

— Eager to learn new things constantly.

We Offer:

— Possibility to propose solutions on a project;

— Dynamic and challenging tasks;

— Team of professionals;

— Competitive salary;

— Low bureaucracy;

— Continuous self-improvement;

— Long-term employment with paid vacation and other social benefits.

Responsibilities:

As member of our Software Engineering Group, you will responsible for detailed design, coding, testing, implementing, maintaining and supporting applications software in their technical area and toolset.

Analyze production issues as necessary to determine the cause of the issue and determine the necessary course of action for resolution. Implement data exchange integrations with our systems and participate in daily standup calls with leads and architects. Supports live systems to ensure business continuity.

About the Project:

We are building a web-based platform to manage IP telephony systems and their users. The platform connects different features like call analytics, call recordings, faxes, voicemails, billing systems, voice recognition, and number provisioning. Our solution helps manage IP telephony in one place, making it easier to handle communication and related tasks.

Delasport — Implementing Technological Solutions Here and Now.
Delasport is an iGaming Software company providing Sports Betting & Online Casino software, and turnkey B2B solutions. Established in 2010, Delasport delivers a one-stop-shop solution of Sports Betting and Online Casino from a White-Label, with a full range of management services to a Plug&Play iFrame and a complete Turnkey. We are looking for the top talents to join our team in R&D centre in Kyiv.
 

TECHNOLOGY STACK

Microservice architecture, Java 21, Java 25, Spring Boot 3.5+, JPA, JDBC, PostgreSQL, Kafka, Google Cloud Platform, Kubernetes, Docker, Testcontainers, Gradle
 

RESPONSIBILITIES

• Development of new business initiatives, an extension of existing ones
• Taking an active part in improvements and optimizations to the systems
• Resolve technical problems, critical thinking on the development approach
• Be part of a cross-functional team with end-to-end responsibility for the result
   

REQUIREMENTS

• 3+ years of commercial development experience using Java-related technologies
• 1+ years of working experience with API development
• Hands-on experience with microservice architecture
• Ambition to write high-quality code covered with integration tests
• Solid debugging and troubleshooting skills
• Proactive and result-oriented mindset
• Strong problem-solving skills
• Good level of English
   

WHAT WE CAN OFFER YOU

• Modern office in Podil with an uninterruptible power supply and the Internet
• Personal time off (21 business days of paid vacation, paid days on special occasions, sick leaves, emergency days off)
• Public holidays
• Health and life insurance with our broker, available starting from the month following the employee’s start date with the company
• Modern technical equipment
• English courses with native speakers
• Ukraine-based educational programs
• Sports activities reimbursement
• Corporate entertainments
• Happy hours on Fridays
• Gig contract support

We are looking for talented Senior Java Engineer to to join our AI project in Europe.

Our California-based customer is an American global e-commerce leader, one of the most popular and successful websites on the Internet. It provides platform services by connecting millions of sellers and buyers in more than 190 markets around the world. 

Responsibilities:

• Design and develop a robust and extensible Kotlin framework and platform for configuring and managing AI agents
• Write clean, maintainable, and efficient code that complies with our coding standards
• Ensure the performance, quality, and responsiveness of the framework/platform
• Identify and correct bottlenecks and errors
• Help to maintain code quality, organization, and automatization.

• Create and maintain technical documentation for the framework/platform

   

Requirements:

• At least 5 years of proficiency in Kotlin or Java
• Deep experience with the Spring Framework 
• Reactive tools experience (Project Reactor)
• Knowledge of different communication protocols such as REST, GraphQL, gRPC
• Experience with distributed systems
• Familiarity with tracing, metrics and monitoring best practices
• Experience of creating frameworks and platform for other developers 
• Proficiency in Maven or similar tools 
• Familiarity with NoSQL databases 

• Very good spoken and written knowledge of English language (C1)

   

Nice to have:

• Familiarity with GenAI, AI agents, machine learning, and natural language processing concepts is a plus
• Experience with MCP, A2A, RAG is a big plus
• Experience with event-driven architecture
• Experience with Docker and Kubernetes
• Python experience is nice to have
• BSc or MSc in Computer Science, Engineering or relevant field

Overview:
We are looking for a Senior Backend Engineer to lead the development of core backend services within a modern microservice infrastructure that powers mobile and embedded clients. This is a senior, hands-on role with architectural ownership, ideal for an engineer who enjoys building scalable distributed systems, designing secure and reliable APIs, and mentoring other developers. You will drive technical decisions and collaborate closely with architects, frontend engineers, and product teams to deliver future-proof backend solutions.

Responsibilities:

• Lead the design and development of backend services using Java in a Docker/Kubernetes-based environment;
• Drive architectural improvements and establish backend best practices across the platform;
• Design, implement, and optimize event-driven systems based on Kafka;
• Build secure, scalable RESTful APIs for internal and external consumers;
• Design and query complex data models using PostgreSQL, with strong focus on performance and reliability;
• Collaborate closely with frontend and product teams to deliver features end-to-end, from concept to production;
• Ensure system reliability and observability through logging, tracing, and monitoring;
• Enable integrations with data pipelines and ML-powered services as part of data-driven and AI initiatives;
• Mentor junior engineers, conduct code reviews, and support team-wide technical growth.

Requirements:

• 5+ years of professional experience in backend development within microservice and cloud-native environments;
• Strong production experience with Java (e.g., Spring Boot or similar frameworks);
• Python experience is a plus, especially for data pipelines, ML integration, or scripting tasks;
• Deep understanding of:
  • Kafka and event-driven architectures;
  • PostgreSQL, including advanced schema design and query optimization;
  • Secure API design and implementation (OAuth2, HTTPS, mTLS).
• Hands-on experience with Docker, Kubernetes, and CI/CD pipelines in production;
• Proven ability to lead cross-functional technical initiatives and make architectural decisions;
• Demonstrated experience mentoring or guiding less experienced engineers;
• Exposure to video streaming backends or media platforms is a plus;
• Strong interest or background in ML- or data-driven applications;
• Bonus: Experience with observability stacks (e.g., Prometheus, Grafana) or real-time analytics systems.

• Project Description:

  The role is based in Krakow, where you will join an established team already working there, collaborating with colleagues across the globe.

• Responsibilities:

  As a Java Developer at UBS, you will play a key role in designing, developing, and maintaining high-quality software applications. You will collaborate closely with cross-functional teams to understand project requirements, implement solutions, and ensure the successful delivery of projects.
  
  We are looking for someone who can:
  
  • be a good team member who can deliver business value through software
  • enthusiastic about programming, willing to strive for the best, and have a good sense of clean code
  • pick up new knowledge and new technologies, and be able to work independently
  • implement and deliver high-quality software solutions
  • work in an Agile/Scrum development process environment and practice test-driven development (TDD)

• Mandatory Skills Description:

  • A degree in Computer Science, Engineering, or related field.
  • Proven experience as a Java Developer with proficiency in Java programming language, Spring framework and Hibernate.
  • Exposure to cloud technologies, preferably Microsoft Azure, and willingness to gain experience in cloud-based solutions.
  • Experience with messaging systems such as EMS and Kafka for distributed communication and event-driven architectures.
  • Strong understanding of software development principles, design patterns, and best practices.
  • Basic knowledge of Unix systems for troubleshooting and maintenance tasks.
  • Experience writing automated tests using JUnit for functional and integration testing.
  • Proficiency in Git version control system. Good knowledge of git plugins for IDEs, preferably IntelliJ IDEA
  • Excellent communication and collaboration skills.
  • Ability to work effectively in a team environment and independently when required.

• Nice-to-Have Skills Description:

  • Previous work in the financial services or banking industry is considered an asset.

• Languages:
  • English: C1 Advanced

About the role
We are looking for a Middle Java Backend Engineer to join our team and work on developing and supporting backend services.

You will be involved in building REST APIs, working with databases, and integrating with external systems.

Responsibilities

• Develop and maintain backend services using Java and Spring Boot
• Build and support REST APIs
• Work with PostgreSQL (schema design, query optimization, transactions)
• Integrate with external services via HTTP APIs
• Implement authentication and authorization (JWT, role-based access)
• Work with file storage (S3 / MinIO)
• Write tests and support existing functionality

Requirements

• Experience in backend development with Java and Spring Boot
• Experience building and supporting REST APIs
• Good knowledge of Spring Web, Spring Data JPA, Hibernate, Spring Validation
• Practical experience with Spring Security, OAuth2 Resource Server, JWT, role-based access
• Solid experience with PostgreSQL (schema design, query optimization, transactions)
• Experience managing database migrations with Flyway
• Experience integrating external services via HTTP APIs
• Experience working with S3 / MinIO or similar storage
• Experience with testing: JUnit 5, Spring Boot Test, integration tests
• Experience with Gradle, Docker, Git

Nice to have

• Experience with Testcontainers
• Experience with Keycloak or similar IAM / SSO solutions

Senior Java Engineer (high-load product) 

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

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

 

Please note that we consider only candidates who are located in Ukraine.

Responsibilities:
 

• Work in SCRUM team
• Design and develop high-load microservices
• Write high-quality code covered with different levels of tests
• Maintain services on production and assure their stability and performance
• Provide code review for teammates
• Contribute to the Company’s development processes and practices
   

Requirements:
 

• Writing code in a clean and maintainable manner.
• Solid experience with Java 8+
• Experience with SQL/NoSQL databases
• Understand microservice architecture patterns.
• Good at Spring framework.
• Experience with REST, messaging systems.
• Ability to cover code by different types of tests.
• Understanding of SOLID principles
• Experience with Git
• Excellent troubleshooting skills.
• Good communication skills.
• Intermediate+ English
   

Would be great to have:
 

• Experience with Kafka, MySQL, Redis, Aerospike.
• Experience with Spring Boot, Spring Cloud
• Experience with Docker, Kubernetes
• Experience in high-load
   

What we offer:
 

• International company with several offices in different locations : Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social and welfare packages;
• 20 working days paid vacation and 100% sick leaves coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team buildings and fun activities;
• Comfortable office close to the metro station. Our Kyiv office is open 24/7 with all safety and health measures in place

🚀AIMPROSOFT — OMS Developer (Fluent Commerce / CommerceTools)!   

Aimprosoft, a fast-growing IT company, is looking for a OMS Developer (Fluent Commerce / CommerceTools) on a contract basis for a long-term international project in the E-Commerce / Marketplace domain.  

This is a senior hands-on role for a specialist who can help implement and configure order management processes in Fluent Commerce, challenge solution flows when needed, and support a complex integration landscape involving CommerceTools, Boomi, and Mirakl.  

The project is currently in the discovery phase, with implementation for first stage expected to run from May to November 2026, then will be longation.  

🎯About the project & role:   

Your mission will be to help the team turn the discovery outputs, architecture flows, and vendor recommendations into a working Fluent Commerce setup.  

The target landscape includes:  

• CommerceTools as the commerce platform  
• Fluent Commerce as the OMS  
• Boomi as the integration / orchestration layer  
• Mirakl for marketplace flows and seller-related processes  

You will not be expected to own the whole business analysis or solution architecture from scratch, but you should be senior enough to:  

• understand and challenge proposed process flows  
• suggest improvements based on real Fluent Commerce project experience  
• implement configurations and processes in Fluent Commerce  
• support end-to-end validation and testing of OMS-related flows  
• collaborate closely with integration and commerce teams  

🔥What We Need From You:   

• Hands-on experience with CommerceTools    
• Background in Java-based backend ecosystems  
• Experience working with GraphQL-based integrations  
• Experience as a Senior Developer / Senior Consultant / Implementation Engineer in OMS-related projects  
• Proven participation in at least a couple of non-trivial commercial projects  
• Understanding of Order Management Systems (OMS) and order lifecycle processes  
• Experience configuring and implementing business rules, workflows, and process flows in Fluent Commerce  
• Ability to review business / solution flows and provide meaningful feedback based on platform best practices  
• Experience working in integrated commerce ecosystems  
• Good understanding of commerce platform integrations  
• Practical understanding of API-based integrations  
• Ability to support testing, troubleshooting, and flow adjustments during implementation  
• Solid communication skills and ability to work in collaboration with architects, BAs, PMs, and external vendor teams  

• English: Upper-Intermediate (B2) or higher for communication with international teams.   

   

📌Nice to have:   

• Hands-on experience with Fluent Commerce 
• Experience with Boomi, MuleSoft, or similar middleware / iPaaS platforms  
• Experience integrating OMS with CommerceTools  
• Experience with Mirakl or marketplace-related integrations  
• Experience in marketplace, drop-shipping, omnichannel, or multi-seller order flows  
• Experience in retail or enterprise e-commerce projects  
• Previous collaboration with vendor professional services teams  

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

   

💼What We Offer:   

• Official military deferment (reservation)
• A competitive salary that appreciates your skills and experience   
• Cozy atmosphere and modern approaches. We have neither bureaucracy nor strict management nor “working under pressure” conditions   
• Opportunity to implement your ideas, tools, and approaches. We are open to changes and suggestions aimed at improvement   
• Work on a strategic, large-scale international project with high visibility.   
• Remote-friendly culture with strong team collaboration.   

Job Description

• 5+ years in professional software engineering with a focus on full-stack web applications.
• Expert in Java (Spring Boot), REST APIs, and microservices orchestration via Kubernetes.
• Deep knowledge of Oracle or SQL and Databricks data warehousing.
• Good understanding of React (hooks, state management) and modern web standards.
• Hands-on experience with Azure or AWS services.
• Proven experience with CI/CD pipelines.
• Problem-solving skills with the ability to tackle challenges proactively and efficiently.
• Functional knowledge or integration experience with Salesforce.
• Experience with Agile tools like Jira and Confluence.
• B.Sc in Computer Science is an advantage.
• Advanced level of English
  
  
   

Job Responsibilities

• Full Stack Development: Build scalable, end-to-end features using Java 17+ (Spring Boot) and React.
• Cloud & Serverless: Architect and deploy event-driven services using Azure Functions or AWS Lambda.
• Data & Warehousing: Design high-performance schemas in Oracle and manage large-scale data processing within Databricks.
• Agile Leadership: Participate actively in all Scrum ceremonies, including:
  - Sprint Planning: Estimate user stories and define the sprint backlog.
  - Daily Stand-ups: Coordinate daily progress and proactively identify blockers.
  - Sprint Reviews/Retrospectives: Demo completed work to stakeholders and drive continuous process improvements.
• Implement testing strategies including unit, integration, and automation tests to ensure the delivery of high-quality code.
• Stay updated on new technologies and methodologies to ensure continuous improvement of the development process
• Maintain comprehensive technical documentation, including code structure, API documentation, and user guides.
• Communicate effectively with cross-functional teams and stakeholders.

Department/Project Description

Our client is a performance rights organization in the United States. It collects blanket license fees from businesses that use music, entitling those businesses to play or sync any songs from the client's repertoire of over 22.4 million musical works. On a regular basis, the client distributes the money to songwriters, composers, and music publishers as royalties to those members whose works have been performed.

Dripify 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.

Project — dripify.com

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.

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.

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.

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 (45min) — ✅Tech interview with Teach Leader (1.5 hour) — ✅Interview with CTO (45min) — ✅Reference check — ✅Offer

We're building a modern SaaS application and seeking a Middle Java Backend Engineer to join our growing team. You'll play a key role in architecting and developing our API infrastructure while contributing to AWS-based deployment strategies.

Required:

• 3+ years of commercial Java development experience
• Strong expertise in building and maintaining production-grade REST APIs
• Proficient with Spring Boot or equivalent frameworks (Google Guice, Vert.x)
• Hands-on experience with MongoDB and NoSQL database design
• Solid SQL knowledge and relational database experience
• Comprehensive testing practices using JUnit and Mockito
• Deep understanding of API design principles, RESTful patterns, and best practices
• Ability to work independently and take ownership of features end-to-end

Strong Advantage:

• DevOps skills with practical experience in infrastructure deployment and automation
• Production experience with AWS services (ECS Fargate, ECR, CloudWatch, VPC, IAM)
• CI/CD pipeline implementation (GitHub Actions, Jenkins, GitLab CI)
• Infrastructure as Code experience (Terraform, AWS CloudFormation, CDK)
• Docker containerization and orchestration
• Elasticsearch for search and analytics
• Experience with distributed systems and async processing

What You'll Do:

• Architect and develop scalable, maintainable REST APIs
• Build robust backend services for our SaaS platform
• Design database schemas and optimize query performance
• Write comprehensive unit, integration, and API tests
• Participate in infrastructure planning, setup, and deployment
• Contribute to architectural decisions and technical roadmap
• Possibly mentor junior developers and conduct code reviews
• Ensure code quality, security, and performance standards

Nice to Have:

• Microservices architecture and domain-driven design experience
• AWS DocumentDB or MongoDB Atlas in production environments
• Message queuing systems (RabbitMQ, AWS SQS, Kafka)
• Monitoring and observability tools (Prometheus, Grafana, ELK stack)
• API security best practices (OAuth2, JWT, API Gateway)
• Performance optimization and profiling experience

What We Offer:

The opportunity to work on a product from the ground up, influence architectural decisions, and grow with the platform as it scales.

We are a U.S.-based fintech startup 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.

Responsibilities

- Develop high-quality Java microservices using Spring Boot.
- Build Kafka producers, consumers, and stream-processing apps.
- Design event-driven architectures with reliability and performance.
- Implement service resiliency patterns such as retries and circuit breakers. - Collaborate on distributed system design and integration.

• Ensure logging, tracing, and monitoring of backend services.

• Support performance tuning and root cause analysis.

   

• Skills
  - Strong in Java, Spring Boot, microservices patterns.
  - Hands-on Kafka development—streams, partitions, consumer groups. - Knowledge of distributed systems architecture.
  - Familiarity with Docker, cloud-native packaging.
  - Experience in REST APIs, schema evolution, and contracts.
  - Understanding of observability (logs, metrics, traces).
  - Good debugging and performance optimization skills.