Jobs Java

• One of the world's largest providers of products and services to the energy industry has a need to develop and support enterprise information system in Oil & Gas domain.
  Product being developed is a cloud solution for interpretation of geological and geophysical data. Project is based on SCRUM methodology.
  Our project is stable, long-term and constantly adopts new technologies such as newest Java and Eclipse RCP versions, cloud and GPU computing, microservices architecture and other innovative frameworks.
  Work supposes close cooperation with Customer team located in Houston and following Agile principles.
  Our team is senior, supportive and friendly.
   

• Responsibilities:

  • Collaborate closely with geophysicists, data scientists, and software engineers to translate scientific domain requirements into robust on-prem or Cloud software solutions.
  • Design, develop, and maintain high-performance applications for geophysical and geological data analysis, interpretation and visualization
  • Present architectural designs and technical proposals to the architecture review board.
  • Ability to break down development tasks and lay out clear implementation roadmaps.
  • Implement and optimize computation algorithms
  • Design and develop both thin and thick client applications that interact with cloud-based microservices.
  • Ensure high code quality through unit testing, code reviews, security hardening and continuous integration with other domain tools
  • Provide technical support and lead user troubleshooting sessions to resolve issues and ensure smooth operation of DSG application.
  • Mentor junior developers and actively contribute to architectural and
  implementation decisions.
  • Embrace Agile/Scrum methodologies, delivering and demonstrating working solutions at the end of each sprint
  • Stay current with emerging technologies and trends in geophysical computing and software development.
   

• Mandatory Skills Description:

  At least 5-10 years of experience
  GIS Java Eclipse
  ESRI ArcGIS Runtime
  ESRI Services and Authentication

Pivdenny Bank is one of the leaders in the Ukrainian financial market and ranks third in the group of Ukrainian private banks in terms of assets. For 32 years, Pivdenny has been a reliable financial partner for individuals, small and medium enterprises, and corporations.

More than 1700 active and dedicated employees work for Pivdenny throughout Ukraine. For four years in a row, the bank has been included in the Forbes 50 Best Employers rating.

We are now looking for a Senior Backend Developer to join our team.

Responsibilities:

• Develop of integration applications on the IBM App Connect Enterprise integration bus in accordance with the current tasks of the department;
• Participate in the design of microservices and their databases;
• Implement unit and integration tests;
• Develop new features and make updates of existent microservices on a daily-basis;
• Write clean, testable, maintainable code, and continue to grow development skills;
• Perform requirement analysis and features estimation;
• Prepare API documentation of microservices;
• Share knowledge of the project with team members.
   

Requirements:

• BS or MS in Computer Science or related field;
• 5+ years of commercial experience in Java;
•  Experience with IBM App Connect Enterprise;
• Good understanding of OOP principles, OOP design, and design patterns;
• Good understanding of microservices architectural principles and experience in the development of RESTful applications and microservices;
• Good practical experience with Java 11+, Spring 5+ / Spring Boot 2+ (Data JPA/Hibernate, Security, Cloud), JUnit 5, Mockito, Testcontainers, Kafka / RabbitMQ;
• Experience with Git, Maven, Docker / Docker compose;
• Good knowledge and practical experience with SQL and relational database.

What we offer:

• Health insurance;
• Competitive salary;
• Work in a functional, comfortable office or remotely;
• Corporate psychologist;
• Opportunity for career growth and development;
• Opportunity to take courses and training;
• Opportunity to work in a stable and professional company with a friendly team.

We review resumes within 14 days. If you do not hear from us, it means that we cannot offer you a position at this time, but we have kept your resume in our database. We will contact you when we have a suitable opportunity.

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

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

Ми шукаємо досвідченого Software Engineer для роботи на проекті локального телеком-оператора.

Основні вимоги:

• Вища технічна освіта
• Досвід розробки в комерційних проектах від 3х років
• Досвіду управління проектами, командами або процесами розробки не менше року
• Знання та досвід використання:
  o Java programming language (Java17, Concurrency, Parallel, Distributed)
  o web applications development (REST/JSON/XML)
  o NoSQL / Cassandra DB, досвід роботи з MariaDB, Oracle DB, розуміння принципів побудови реляційних / нереляційних баз даних, знання SQL
• Знання та досвід використання й побудови CI/CD processes, досвід роботи з Maven, Gradle, JUnit, CI/CD tools
• Знання та досвід роботи з Spring Framework (MVC, Boot, Security), Akka (HTTP, Streams), Distributed cache Framework, Hibernate, Kafka, ArtemisMQ, Hazelcast
• Досвід використання agile software development methodologies, принципівSDLC, Scrum, Kanban, XP, WF
• Знання та досвід використання microservices, monolith, soa, design patterns
• Досвід роботи з:
  o Docker stack 
  o Grafana, ELK Stack, Artifactory 
  o OS RedHat linux (CentOS/Fedora/Oracle Linux) 

• Рівень англійської мови - intermediate level або вищий

   

Буде перевагою:

• Досвід роботи з Kubernetes, Cloud (AWS)
• Досвід написання технічної документації
• Досвід виконання технічної підтримки
• Досвід роботи в області телекомунікацій, архітектури білінгових та vas (value added services) систем, базові знання принципів

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.
• Ownership & Equity: Competitive compensation, including significant equity in an early-stage, high-growth startup.
• 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.

N-iX is looking for an experienced Senior Java Engineer who goes beyond standard CRUD APIs and lives in the world of information retrieval.

Our customer is a Fortune 500 company. As a leading business-to-business organization, more than 3.2 million customers rely on its products in categories such as safety, material handling, and metalworking, along with services like inventory management and technical support. ​

In this role, you will act as the bridge between our core Java application architecture and our specialized search infrastructure. You will be responsible for the entire search lifecycle: from designing how data is ingested and indexed, to building the Java APIs that query that data, and crucially, tuning the relevancy algorithms that ensure our users find exactly what they are looking for, instantly. The ideal candidate has deep roots in the Apache Solr ecosystem but is also ready to embrace modern cloud-native search via AWS OpenSearch. Whether you are maintaining critical legacy Solr clusters or architecting new solutions on AWS, your goal is to make data findable, fast, and relevant.

Technology stack: Java/Spring Boot, Apache Solr (Legacy/Core), AWS OpenSearch (Modern/Growth), SQL DB, Kafka 

Responsibilities:

• Design, develop, and maintain high-performance backend Java services (primarily Spring Boot) that integrate with search engines.
• Build complex search features for the frontend, including faceted navigation (filtering), multi-tenant searching, real-time autocomplete/typeahead, and spell-checking suggestions.
• Utilize Java client libraries (such as Solr or AWS SDKs) to construct efficient, programmatic queries.
• Take ownership of the search schema design, deciding how complex data structures should be analyzed, tokenized, and stored for optimal retrieval.
• Build robust ETL pipelines in Java (potentially using Kafka or other messaging systems) to synchronize data from primary SQL databases into the search indices in near real-time.
• Configure analyzers, stemmers, and tokenizers to handle nuances in human language.
• Diagnose slow queries, analyze search logs, and optimize both Java application code and search engine configurations for low-latency performance.
• Maintain and optimize existing on-premise or cloud-hosted Apache Solr installations.
• Play a key role in designing hybrid strategies or migration paths from legacy Solr systems to managed AWS OpenSearch environments.

Requirements: 

• 5+ years of professional experience in backend software development using modern Java (Java 8+, Spring Boot ecosystem).
• Strong, demonstrable experience with Search Technologies. This means either:
  • Hands-on production experience configuring, managing, and developing against Apache Solr (understanding schema.xml, solrconfig.xml, Zookeeper integration).
  • OR deep foundational knowledge of Lucene-based search concepts (inverted indices, analysis chains, TF-IDF/BM25 scoring logic) with the ability to quickly apply that to Solr.
• Hands-on experience with AWS OpenSearch (or Elasticsearch) in a managed cloud environment.
• Experience with data modeling in relational databases (PostgreSQL, MySQL, Oracle).
• Strong understanding of RESTful API design principles.
• Preferred Qualifications:
  • Experience architecting zero-downtime migrations from self-hosted Solr to managed cloud search services.
  • Experience with event-driven architecture and streaming tools like Apache Kafka for real-time indexing.
  • Familiarity with containerization (Docker, Kubernetes) and CI/CD pipelines like Jenkins or GitLab CI.

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

About Us

levl (www.levl.ch) offers a single unified platform for fast, secure, and cost-effective cross-border payments. Platforms can plug into our payments API, use our dashboard, or OTC desk to send and receive payments for their customers.

levl is incubated and funded by Galaxy Digital, a public financial services firm managing $5b+ AUM, and based out of their European offices. levl’s team previously worked at top payment companies, exchanges, and hedge funds including PayPal, London Stock Exchange, AQR ($150b+ quant fund), Brevan Howard, and Galaxy Digital.

About the Role

We are looking for a talented Backend Software Engineer to help build Levl’s payments platform. This is an opportunity to join a fast-paced early-stage startup in which you will be given tremendous ownership and autonomy.

You will play a pivotal role in leveraging stablecoins to democratize access to financial services and shape the future of financial inclusion. If you're passionate about Software Engineering, love building products, and want to transform the financial landscape, we want you on our team!

Key Responsibilities

• Working with cross-functional teams to build mission-critical financial services web products. You will be building microservices, API’s, web applications, and integrations to support cross-border payments and related back-office operations.

• Working closely with the CTO and contributing to ongoing efforts to enhance our payments platform.

   

Requirements

• Minimum 3 years of development of microservices
• Proficiency in Java or Golang and related frameworks, e.g. Spring Boot, Gin
• Proficiency with relational databases (ex PostgreSQL)
• Experience with Docker, Kubernetes, Helm etc
• Experience working with message buses such as NATS, Kafka
• Experience in building cloud-native services using AWS, GCP, or Azure
• Experience in REST API development
• AI-native - experienced in leveraging AI technologies to build software (Claude, Cursor etc)
• Strong grasp of unit testing principles and testing libraries
• Strong problem-solving and communication skills.
• Ability to work with others in a fast-paced environment.

• Ability to self-organise and deliver high-quality work.

   

Nice to Have

• Experience building payment or trading systems
• Experience working with AWS-specific cloud services such as SQS, S3, IAM
• Front-end development experience using JavaScript, TypeScript, React, Next.js

Additional Information

•  Background checks will be carried out

About Us
Peratera is a UK-based fintech company, founded in 2022 and authorised by the FCA as an Electronic Money Institution.

We are building a modern, all-in-one payment platform that enables businesses to manage global payments and financial operations seamlessly.

Our solution allows companies to open multi-currency accounts, send and receive payments worldwide, and manage cross-border transactions from a single platform.

Our mission is to simplify global finance and remove friction from international business operations.

Your Mission 

As a Senior Java Engineer, you will be a core contributor to our distributed financial platform - going beyond coding to actively shape architecture, drive engineering excellence, and help build systems that are scalable, observable, and regulation-ready. You will join at a stage where the platform is evolving fast and the right engineers will grow with it - toward Tech Lead or Staff Engineer roles.

Your Tech Environment

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

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

What You’ll Do 

• Design and develop high-load, distributed backend services for financial operations
• Work on core payment flows, callbacks, reconciliation, and transaction lifecycle management
• Participate in architecture discussions and contribute to system design decisions
• Implement observability across services - logging, metrics, and distributed tracing
• Improve system reliability, fault tolerance, and overall platform resilience
• Drive code quality, testing strategy, and engineering best practices across the team
• Collaborate closely with Product, DevOps, and Architecture teams
• Contribute to the platform's evolution toward AI-assisted and data-driven capabilities
   

What We’re Looking For

• 6+ years of strong, production Java experience
• Deep expertise in the Spring Boot ecosystem
• Solid understanding of distributed systems and microservices architecture
• Experience building high-load or financial systems - payments, banking, or fintech
• Strong REST API design skills and hands-on experience with messaging systems
• Solid SQL skills; PostgreSQL experience preferred
• Familiarity with cloud environments, CI/CD pipelines, and observability tooling
• Clean Code mindset - SOLID principles, maintainability, and genuine ownership
• Comfortable working asynchronously in a distributed, international team
   

Nice to Have

• Exposure to Open Banking or regulated payments environments
• Experience with Camunda or other workflow orchestration engines
• Understanding of PCI DSS compliance requirements
• Experience with event-driven or event-sourcing architectures
• Interest or hands-on experience with AI/ML applied to backend systems
   

What You’ll Get

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

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

Tenexti is an emerging software development company based in Lviv. We specialize in creating innovative solutions, delivering high-quality results, and helping our clients turn their ideas into reality. With a passion for technology and a commitment to excellence, we strive to build lasting partnerships and drive meaningful impact through our work.

We are looking for a Java/Kotlin Developer to join our team.

🧑‍💻 What we expect from the ideal candidate:

• You have 1-3 years of experience working with Java in production environments.
   
• You are a good engineer. You don’t write code just to the point when it starts working. You go the extra mile to make your code elegant. You are passionate about technology and you take ownership of the things you implement. You have skills to design solutions that are simple, robust and easy to maintain.
   
• You are open-minded and eager to learn. Strong Java proficiency is required, but you should be comfortable working with Kotlin and functional programming patterns. We’re actively modernizing our codebase—new features are primarily written in Kotlin. You don’t need to be a Kotlin expert from day one, but you should be excited to grow in that direction.
   
• You think beyond just coding. Building great software isn’t about closing tickets—it’s about making the product and codebase better every time you touch it. You’re creative, you ask questions, and you care about the “why” behind what you’re building.
   
• You are a good team player. You treat people around you well and have strong communication skills to articulate technical decisions clearly.
   
• You don’t need supervision. You are self-driven and can solve problems on your own. You take initiative when you see opportunities for improvement.

💡 What you will do:

• Work on a mission-critical system that handles complex data synchronization workflows. System stability is paramount—downtime during peak hours leads to significant financial impact.
• Balance legacy and modern code. Help modernize existing Java code while building new features in Kotlin. Refactor legacy code, prune dead code, and gradually improve architecture while keeping the system stable.
• Implement complex business logic using sophisticated rules engines (like GoRules) for pricing logic, data mapping decisions, and business-critical workflows. You’ll participate in market analysis and some business decisions around pricing strategies.
• Optimize performance at scale. Process hundreds of thousands of records with strict rate limits. Identify bottlenecks, optimize database queries, improve API performance, and ensure queues don’t stack up.
• Participate in analytical decisions. While you’re a developer first, you’ll be involved in market analysis, system auditing, and even some business decisions around pricing and data strategies. We value engineers who understand the business impact of their work.
• Monitor system health extensively. Work with Grafana dashboards tracking dozens of critical metrics. Slowing of DB or API calls can cascade into serious issues.
• Perform code reviews. Suggest better, cleaner, and simpler approaches. Help the team grow by sharing knowledge.

Team and Customer:
We are a team of engineers based in Lviv working for a US-based customer. All engineers and architectural decisions are here locally—no late calls with the US, no overseas knowledge holders blocking you.
Our customer is not backed by venture capital but by reliable business revenue. We’re self-funded and don’t experience pressure to cut roles in Ukraine due to "country risks"—quite common lately.
We’re hiring due to business growth. By leveraging technology and smart people, we empower the business to grow further.

Product:
We work on a high-stakes data synchronization system handling hundreds of thousands of records in real-time. The product ensures data consistency between multiple systems while operating under strict rate limits and performance constraints.
This is a fascinating technical challenge—not a simple CRUD application, but a complex, performance-sensitive system where every optimization matters, stability is non-negotiable, and creative problem-solving is daily routine.

Technical highlights:

• Java monorepo with two main applications: a large-scale sales service (40GB RAM, 99.9%+ uptime) and a smaller purchase service. While development focus varies, you’ll need to be flexible across both
• Complex distributed architecture: Our Java apps depend on multiple Node.js microservices that serve as data providers. These Node apps are split across AWS and Hetzner, communicating via RabbitMQ
• Separate Redis instances for Java app and Node.js services
• Processes hundreds of thousands of records while respecting strict API rate limits (~700 requests/minute). Mistakes can take hours or days to fix
• Heavy reliance on Grafana dashboards with dozens of charts. Performance monitoring is critical—slowdowns cascade through the entire data pipeline

🚀 Our technology stack:
Backend:

• Java 21 & Kotlin (actively migrating towards more Kotlin)
• Spring Boot
• MongoDb, Redis
• GoRules for complex business logic

Infrastructure & DevOps:

• Kubernetes
• ArgoCD and Github Actions
• OpenSearch for logs
• Prometheus & Grafana for metrics & traces

The broader ecosystem:

• TypeScript, Node.js & Nest.js microservices
• PostgreSQL, Hasura & GraphQL

Projects you may work on:

• Modernizing the codebase: Refactoring legacy Java to Kotlin, improving architecture and maintainability
• Large-scale data migrations: Complex migrations with massive data volumes, zero downtime
• Performance optimization: Hunting tricky bottlenecks, optimizing queries, improving API response times
• Analytics improvements: Building features for transparent sales data and system metrics
• Business logic enhancements: Implementing clever mechanics using GoRules for pricing and data mapping
• System reliability: Enhancing monitoring, alerting, and recovery mechanisms

Why choose this project and team?

• Stable project running successfully for 8+ years with consistent revenue growth
• Entire R&D team in Ukraine making all architectural decisions locally
• Mission-critical production system where your decisions directly impact business outcomes
• Real engineering challenges: Performance optimization, rate limiting, data consistency, large-scale refactoring
• Opportunity to work on a quite high load production system (Monolith + microservices) and have an impact on how it is designed and shaped.

Perks and Benefits:

🏋️‍♂️ Gym compensation

🏝18 days of paid vacation, public holidays, and paid sick leave

💻 Modern tech gear: MacBook based on silicon CPU (M1-M3) with 32 of RAM

🇬🇧 English lessons

⏱️ Flexible working hours and no time trackers

✈️ Possible trips to USA when the war ends. Before the war, we flew there twice and we loved it :)

If you read this far please start your message with “Glory to Ukraine!”, thank you!

Onicore is a FinTech company specializing in developing products for cryptocurrency operations. We strive to make crypto convenient and understandable for everyone.
 
And now we are looking for a talented and experienced Java Team Lead to join our team. If you’re passionate about working with the latest technologies, contributing to exciting product developments, and collaborating with an awesome team, we want to hear from you!
 
Your Key Duties:

• Design, develop, and maintain high-performance, scalable Java-based applications in the FinTech domain.
• Implement and optimize multithreaded and concurrent solutions, ensuring thread safety and system reliability.
• Build and maintain microservices using the Spring ecosystem.
• Ensure database efficiency, including query optimization, proper indexing, and transaction handling.
• Evaluate and improve application performance, conduct profiling sessions, and resolve bottlenecks.
• Design and implement synchronous and asynchronous integrations with internal and external systems.
• Participate in architectural discussions, propose improvements, and drive technical initiatives.
• Collaborate closely with product managers, architects, and QA engineers to deliver business-critical solutions.
• Write clean, maintainable, and well-tested code following best practices.
   

Your Skills:

• 5+ years of professional experience in Java development.
• Strong expertise in Java 17+ (knowledge of modern language features, streams, lambdas, functional programming concepts).
• Deep understanding of core Java:
• Collections Framework, Generics, Streams, Functional Interfaces
• Concurrency utilities (Executors, CompletableFuture, Fork/Join, Locks, Atomics, etc.)
• Proven experience with the Spring ecosystem: Spring Boot, Spring Data (JPA/Hibernate), Spring Security, Spring Cloud (microservices).
• Solid understanding of databases (SQL and/or NoSQL), including:
• Transactions, isolation levels, and locking mechanisms
• Query optimization and indexing strategies
• Hands-on experience with multithreading and concurrency, including race conditions, deadlocks, synchronization, and strategies to avoid them.
• Proficiency in synchronous and asynchronous communication: REST, messaging systems (Kafka, RabbitMQ, etc.), event-driven architectures.
• Experience working on FinTech or financial services projects.
• Strong focus on performance evaluation, scalability, and reliability.
• Strong problem-solving skills, ability to work independently, take initiative, and drive solutions proactively.
• Self-driven and responsible, capable of working with minimal supervision.
• Proactive, solution-oriented mindset.
• Team player with a collaborative attitude.
   

Nice to have:

• Experience with Kubernetes, Docker, and cloud-native environments.
• Experience with application profiling and performance tuning:
• Tools such as VisualVM, JFR (Java Flight Recorder), JMC (Java Mission Control)
• Identifying and resolving performance bottlenecks
• Analyzing complexity of SQL queries and optimizing execution plans
• Familiarity with CI/CD pipelines and DevOps practices.
• Knowledge of distributed systems, event sourcing, or CQRS.
   

What’s on us:

— Competitive salary and benefits package.

— Opportunities for professional development and career growth.

— Health insurance.

— Remote work with the possibility to visit our office in Kyiv.

— Space to share your ideas and bring them to life.

Is this all about you? Send us your CV!

Who we are:

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

About the Product: 
Over the past few years Coro has received $175M in funding and is one of the fastest growing Cybersecurity companies in the world. The funding is primarily being used to enhance the Coro Cybersecurity SaaS platform and for additional headcount growth, as Coro continues to expand globally.   

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

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

About the Role: 

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

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

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

Key Responsibilities: 

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

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

   

Required Competence and Skills:

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

Nice to have:

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

Why Us?

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

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

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

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

Шукаємо Java початківців — майбутніх гуру Web & Enterprise backend Java development!

Ми — команда професіоналів, для нас створювати якісні ФінТех рішення які розробляються, тестуються та випускаються українською командою спеціалістів та експертів — є пріоритет №1.

Ми запускаємо повноцінну програму навчання майбутніх Java Developers. Ми віримо, що талановиті новачки можуть стати справжніми професіоналами за правильного підходу до навчання. Якщо ти мрієш стати впевненим Java Developer і працювати в команді майстрів своєї справи — долучайся до нас. Формат повністю віддалений — проходь стажування з будь-якої точки України.

Що ми пропонуємо:

🟢Безкоштовне стажування до результату за напрямком Java Development;

🟢Працевлаштування після успішного завершення інтернатури;

🟢Повне занурення у професію зі старту;

🟢Підтримку менторів на всьому шляху;

🟢Регулярний фідбек і індивідуальне корегування плану;

🟢Програму стажування індивідуально підлаштовувану під рівень знань;

🟢Практику з проектами і задачами аналогічними до комерційних у віртуальній лабораторії компанії;

🟢Вирішення учбових задач реального рівня складності;

🟢Багато цікавої теорії та практики;

🟢Робота в команді за Scrum/Agile підходами;

🟢Гнучкий графік і повністю дистанційний формат який можна поєднувати з навчання в університеті .

Що потрібно від тебе:

🟠Знати синтаксис Java, прості управляючі конструкції, основи ООП і OOD;

🟠Практичний досвід колекціями та стрімами у Java;

🟠Використання реляційних БД і SQL-запитів;

🟠Практичне застосування алгоритмів та структур даних;

🟠Знання англ. мови на рівні В1+;

🟠Велике бажання розвиватися.

Ти стовідсотково наш кандидат, якщо:

• Постійно цікавишся новітніми технологіями розробки на платформі Java;
• Маєш сильне бажання розвиватися як full-stack чи backend розробник;
• Не боїшся нових викликів та цікавих важких задач;
• Маєш аналітичний майндсет та вміння мислити нестандартно;
• Вмієш організовувати свій час, самостійно шукати інформацію та працювати на результат;
• Маєш англійську для читання документації і базові знання з computer science.

Як усе працює:

Термін: визначається індивідуально;

Формат: онлайн з будь якої точки України;

🔵Курс для початківців (опціонально);

🔵Курс backend розробки мікросервісів на Java; Spring, etc.;

🔵Стажування на учбових проектах;

🔵Регулярні фідбек-сесії з твоїм ментором;

🔵Працевлаштування на комерційні проекти.
 

Програма стажування включає в себе наступні теми, але не обмежується ними:

• Поглиблене вивчення Java;
• Робота з Git та командним рядком;
• Базові принципи навчального процесу;
• Ключові концепції Java Core;
• Основи запитів SQL та баз даних;
• ORM з використанням Hibernate;
• Принципи роботи вебу;
• Створення вебзастосунків з Spring Boot;
• Багатопоточність у Java;
• Базовий рівень JavaScript;
• Алгоритми та структури даних на практиці;
• Основи верстки: HTML і CSS;
   

Як приєднатися до нас?

🟡Надіслати нам CV;

🟡Пройти pre-screening інтерв’ю з рекрутером;

🟡Виконати типове тестове завдання;

🟡Пройти фінальне інтерв’ю з технічним експертом.

Ласкаво просимо до команди!

Sagax Software - це продуктова IT-компанія, що створює сучасні рішення для автоматизації страхового бізнесу. Ми розробляємо комплексну платформу для страхових компаній, яка автоматизує всі аспекти їхньої діяльності. 

Що ми пропонуємо: 

• Робота над продуктом, який змінює ринок. Ви будете частиною масштабної платформи, яка допомагає страховикам підкорювати нові вершини бізнесу. 
• Актуальний технологічний стек. Ми слідуємо тенденціям у світі технологій і використовуємо сучасні інструменти для створення якісних рішень. 
• Стабільність і можливість професійного розвитку. Ми пропонуємо стабільну роботу в команді, яка активно розвивається, і надаємо можливості для професійного росту через навчання, обмін досвідом та участь у цікавих проєктах. 
• Турбота про ваше здоров’я. Програми страхування здоров’я та життя, оплачувані відпустки й лікарняні забезпечать вашу впевненість у завтрашньому дні. 

• Зручний формат роботи. Обирайте між віддаленою роботою або офісом у центрі Києва, БЦ "Гулівер" (поруч зі ст. метро Палац спорту). Ви маєте можливість працювати з будь-якого місця України і не тільки.    

   

Зараз ми шукаємо Java Developer в команду, що займається розробкою нових функціональностей та адаптацією існуючого продукту для клієнта на базі CRM-системи для управління продажами страхових продуктів.  

Наш процес найму включає: ознайомчий дзвінок, співбесіду з рекрутером, технічну співбесіду і знайомство з HRD та Java Lead. Усі 4 етапи займають разом орієнтовно 3 години. 

Ваша команда це: Ви, 6 Java Dev, 4 BA, РO, 3 QA, AQA, Team Lead.

Наш основний стек: 
• Backend: Java 11-25, Spring (Core, Security, Boot, Cloud) 
• Databases: PostgreSQL 
• Other technologies: GitLab, GitLab CI, Elasticsearch

Ваші основні задачі:
• Розробка та проектування мікросервісів, участь в архітектурних рішеннях
• Реалізація бізнес-логіки нових продуктів: комунікація з ВА, уточнення деталей, аналіз вимог, проєктування рішень, написання якісного коду
• Відповідальність за частину функціоналу: технічна координація, онбординг новачків
• Інтеграція сервісів між собою через REST API та брокер повідомлень RabbitMQ
• Покриття коду тестами для забезпечення стабільності та якості розроблених рішень
• Проведення code review та технічних обговорень
• Співпраця з DevOps, QA, BA та іншими розробниками на всіх етапах реалізації задач

Що ми очікуємо: 
• Досвід роботи на позиції Java Developer не менше 3-х років
• Досвід роботи з Java 11+, Spring Framework
• Досвід роботи з Hibernate, JPA 
• Комерційний досвід написання та оптимізації запитів SQL (PostgreSQL, MySQL) 
• Вміння працювати з REST API та XML config
• Навички та досвід написання тестів (JUnit, Mockito) 
• Досвід роботи з Docker
• Досвід роботи з меседж-брокерами (RabbitMQ, Kafka або ActiveMQ)
• Досвід роботи на проектах із мікросервісною архітектурою
• Комерційний досвід використання AI-інструментів на проекті (генерація коду, рефакторинг, аналіз, допомога у написанні логіки тощо)

Буде плюсом:
• Досвід роботи з NoSQL (Mongo, Redis)
• Досвід роботи з інфраструктурними інструментами: моніторинг та алертинг (Grafana, Prometheus), централізоване логування (ELK Stack), знання GitLab CI/CD

Про проєкт: 

Платформа автоматизує страховий бізнес — продажі та клієнтські процеси страхових компаній. Проєкт спрямований на розширення CRM-модулю під клієнта: додаємо нові страхові продукти й адаптуємо сценарії продажу під його процеси. 

Основні задачі вашої команди: 

• Побудова нових цифрових продуктів для клієнта на базі існуючої платформи 
• Розробка та адаптація модулів під нові страхові продукти 
• Робота за гнучкою методологією з регулярними плануваннями та ітераціями; всередині команди — взаємні code review та обмін знаннями. 

Будемо раді розглянути ваше резюме у відгуках на цю вакансію! 

Sagax Software - це продуктова IT-компанія, що створює сучасні рішення для автоматизації страхового бізнесу. Ми розробляємо комплексну платформу для страхових компаній, яка автоматизує всі аспекти їхньої діяльності. 

Що ми пропонуємо: 

• Робота над продуктом, який змінює ринок. Ви будете частиною масштабної платформи, яка допомагає страховикам підкорювати нові вершини бізнесу. 
• Актуальний технологічний стек. Ми слідуємо тенденціям у світі технологій і використовуємо сучасні інструменти для створення якісних рішень. 
• Стабільність і можливість професійного розвитку. Ми пропонуємо стабільну роботу в команді, яка активно розвивається, і надаємо можливості для професійного росту через навчання, обмін досвідом та участь у цікавих проєктах. 
• Турбота про ваше здоров’я. Програми страхування здоров’я та життя, оплачувані відпустки й лікарняні забезпечать вашу впевненість у завтрашньому дні. 

• Зручний формат роботи. Обирайте між віддаленою роботою або офісом у центрі Києва, БЦ "Гулівер" (поруч зі ст. метро Палац спорту). Ви маєте можливість працювати з будь-якого місця України і не тільки.    

   

Зараз ми шукаємо Java Developer в команду, яка відповідає за розробку і підтримку одного з ключових модулів нашої платформи — сучасної CRM-системи для управління продажами страхових договорів та розробку мобільного застосунку для страхової компанії. 

Наш процес найму включає: ознайомчий дзвінок, співбесіду з рекрутером, технічну співбесіду і знайомство з HRD та Team Lead. Усі 4 етапи займають разом орієнтовно 3,5 години. 

Ваша команда це: Ви, 5 Java Dev, 4 BA, Team Lead

Наш основний стек:  

• Backend: Java 11+, Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security) 
• Databases: SQL 

• Other technologies: Hibеrnate, мікросервісна архітектура, REST API, Docker,  RabbitMQ 

   

Ваші основні задачі: 

• Створення нових модулів та функцій для CRM-системи 
• Оптимізація існуючого коду для покращення продуктивності та стабільності 
• Реалізація інтеграцій із сторонніми API та платформами 
• Документування реалізованих рішень, архітектурних підходів та змін у системі 
• Взаємодія з DevOps, QA, бізнес-аналітиками та іншими розробниками для забезпечення успішної реалізації завдань 

• Участь у код-рев’ю та обговоренні технічних рішень 

   

Що ми очікуємо:    

• Досвід роботи з Java (11+) від 1,5 року
• Досвід роботи з Spring Framework (Spring Boot) 
• Досвід роботи з Hibernate/JPA 
• Досвід роботи з SQL (PostgreSQL/MySQL)   
• Вміння працювати з REST API  
• Навички та досвід написання тестів (JUnit, Mockito)   
• Досвід роботи з Docker 
• Досвід роботи із Git 
• Досвід роботи або розуміння принципів мікросервісної архітектури 

Буде плюсом: 

• Досвід роботи з RabbitMQ 

• Комерційний досвід використання AI-інструментів на проекті (генерація коду, рефакторинг, аналіз, допомога у написанні логіки тощо)  

   

Про проект: 
CRM-модуль — це ключова складова нашої платформи для автоматизації страхового бізнесу. Він створений, щоб допомогти страховим компаніям керувати продажами швидше та ефективніше, автоматизувати рутинні процеси та забезпечити зростання їхнього бізнесу. 

Основні задачі вашої команди: 

• Оптимізація та розвиток CRM-системи, зокрема інтеграція із зовнішніми сервісами та платформами 
• Розробка нових функцій та модулів CRM-системи та веб-сайту 
• Участь у міграції окремих компонентів на сучасні технології та підвищення загальної продуктивності системи 

Будемо раді розглянути ваше резюме у відгуках на цю вакансію!