Jobs Java

We are looking for a Senior Software Developer to join a long-term project for one of our enterprise clients. You will work on building and scaling monitoring applications for critical energy infrastructure.

• Start Date: October 26, 2026

• Duration: ~1 year (until October 30, 2027)

   

  What You Will Do

• Develop and maintain core backend logic for energy monitoring applications (approx. 80% Python / 20% Java).
• Build high-performance REST APIs and microservices using FastAPI and Spring Boot (JDK 21+).
• Implement asynchronous event streams and data messaging workflows with Apache Kafka.
• Configure and deploy application manifests using Helm Charts and containerization tools.
• Collaborate actively in an Agile environment (Scrum or Kanban) to ensure stable delivery.

     What We Are Looking For

Core Requirements:

• 5+ years of commercial experience in IT solution development.
• Python Expertise: Strong hands-on experience with FastAPI, Kafka, and Helm Charts.
• Java Competency: solid background with Spring Boot, JDK 21+, and Maven.
• Proven experience working in Agile software development teams (Scrum or Kanban).
• Upper-Intermediate+ English communication skills (written and spoken).

Nice to Have:

• DevOps & Tooling: Kubernetes, Argo CD, Protobuf, Pydantic, Grafana.

Domain Experience: Background in the Energy sector, SCADA, PMU, Power Quality, or critical infrastructure systems.

     Tech Stack

• Core: Python, FastAPI, Java, Spring Boot (JDK 21+), Kafka, Helm Charts, Maven
• Ecosystem / Infrastructure: Kubernetes, Argo CD, Protobuf, Pydantic, Grafana

     How to Apply / Submission Details

If you are interested, please submit the following details before the deadline:

1. CV in PDF or Word format.
2. Hourly rate (in EUR/USD).
3. Current location.
4. Earliest availability / notice period.

📌 Application Deadline: October 5, 2026 (inclusive)

About Our Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior Software Engineer for the team that owns the reliability and operational excellence of a large-scale data platform, delivered both as a cloud service and as self-managed software. You will work across the full platform — observability, security, control plane, and core services — diagnosing complex issues and delivering durable fixes across cloud, hybrid, and on-premises environments, in close collaboration with product engineering, SRE, support, and field teams.

This is a backend platform engineering role focused on distributed systems reliability — not application development or CRUD services.

Responsibilities

• Investigate, diagnose, and resolve complex issues across cloud and self-managed deployments — distributed systems failures, performance degradation, and reliability incidents
• Own bug fixes and targeted improvements across core services, control plane, security, and observability infrastructure
• Support automated deployment and integration frameworks that enable consistent, repeatable delivery across cloud, hybrid, and on-premises environments
• Contribute to cluster lifecycle management, observability, and operational supportability capabilities
• Partner with SRE, support, and field teams to triage and resolve escalated customer issues
• Build runbooks, root cause analyses, and internal tooling that reduce time-to-resolution over time

• Collaborate with product engineering so that fixes are integrated back into the main codebase effectively

   

Required Qualifications

• Bachelor's or Master's degree in Computer Science or a related field, or equivalent experience
• 5+ years of software engineering experience with strong hands-on Java development at production scale
• Proficiency in Python and Bash for scripting, automation, and tooling
• Solid foundation in data structures, algorithms, and multi-threaded / asynchronous programming models
• Experience designing, debugging, and operating large-scale distributed systems or microservices
• Hands-on experience with Kubernetes and Docker across cloud, hybrid, or on-premises deployments
• Cloud-native development experience on one or more of AWS, Azure, or GCP
• Strong understanding of networking fundamentals (TCP/IP, DNS, HTTP)
• Clear communicator — able to explain problems, root causes, and solutions to technical and non-technical audiences
• Comfortable with AI-assisted development workflows — using modern AI tools productively while critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings

Desired Skills

• Observability platforms: OpenTelemetry, distributed tracing, metrics, logging
• Background in data processing, data warehouse, data lake, or analytics systems
• Distributed file and object storage: S3, ADLS, or HDFS
• Infrastructure-as-code (Helm, Terraform) and CI/CD tooling (Jenkins, ArgoCD)
• Identity, authentication, and authorization systems: SSO, OAuth, SAML, RBAC
• NoSQL databases (MongoDB, RocksDB), Redis, or partner/OEM integration patterns

• Query processing, concurrency control, data replication, or storage systems

   

Details

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

Location: Remote, EU
Duration: Longterm
Workload: Fulltime 40 hrs
Start: ASAP
Languages: English (min. B2). German (min. C1)
Interview rounds: 2-3
Location: Remote, office possible

Responsibility for mission-critical banking systems: help build the next generation of cloud-native banking software.
You'll work with Spring, microservices and Kubernetes on systems that banks rely on, and actively shape both architecture and product.
Our client develops cloud-native banking software and is looking for a Software Developer to strengthen its development team.

Overview

• Location: Remote, office possible
• Working hours: Full-time, 40 hours per week, flexible scheduling
• Focus: Java, Spring, microservices, Kubernetes

Your responsibilities

• Further development of existing microservices, plus analysis, design and implementation of new features together with product management
• Making and justifying architecture decisions as a team
• Code reviews and technical onboarding of new team members
• Creating and maintaining automated tests
• Active support in the deployment process

Your profile

• Professional experience as a software developer in product development
• Very good knowledge of Java and the Spring Framework
• Understanding of banking processes
• Fluent German (C1) in speech and writing, as technical coordination within the team, with product management and with customers is usually conducted in German
• Experience with agile software development
• Experience with cloud-native environments

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

Project Description:

We are developing a platform that receives securities and price data from multiple providers, enriches and validates it, and distributes the consolidated data to internal bank systems. Our team manages various web and desktop applications, web services, and Linux environments that enable visualization of securities and execution of related workflows.

Responsibilities:

- Develop back-end systems using Java with well-tested code.
- Support the development environment, primarily through automation using Jenkins CI and Bash.
- Evaluate and implement new development tools, libraries, and methodologies to enhance quality.
- Conduct peer code reviews for changes in the project codebase.
- Collaborate effectively with a global team across multiple time zones, demonstrating strong verbal and written communication skills.
- Provide constructive suggestions and alternative solutions to team members to identify the most efficient and optimized approaches.

Mandatory Skills Description:

The role requires extensive expertise in Java SE and Java EE with over a decade of professional experience, emphasizing strong proficiency in the Spring framework, including Boot, IoC, MVC, AOP, Security, Data, JDBC, and testing components. The candidate must be skilled in SQL and relational databases, specifically Oracle, and have a solid understanding of Servlets, servlet containers such as Tomcat, and application servers like Weblogic. Familiarity with CI/CD processes and tools, notably TeamCity and Jenkins, is also essential.

Hard skills include:
- Advanced Java SE and Java EE development
- Comprehensive Spring framework application
- SQL query writing and database management using Oracle
- Knowledge of Servlets, Tomcat, and Weblogic server environments
- Experience with CI/CD pipelines using TeamCity and Jenkins
- Practical Linux system navigation, file and permission management, user and group administration, process and service handling, security keys and certificates, and basic Bash scripting

Soft skills focus on:
- Analytical problem-solving to identify and implement effective, maintainable solutions
- Collaborative discussion and consensus-building within the team to select optimal approaches

Nice-to-Have Skills Description:

- Proficiency in Angular or similar frameworks (React, Vue), including Angular Material and RxJs, demonstrating capability in modern front-end development.
- Ability to design and implement visually appealing and functional HTML/CSS layouts.
- Strong expertise in Oracle database management and operations.
- Familiarity with ELK stack for logging, monitoring, and data analysis.
- Experience working with Spring Cloud modules and developing microservice architectures.

Languages:

English: B2 Upper Intermediate

We are working on a platform, which receives data about securities and prices from various data providers, enrich and validate it, and finally distribute the consolidated data to internal bank systems. Our team is responsible for different web applications, desktop applications, web services and Linux environments that allow to visualize securities and to execute workflows on them.

Our components are created in Java 8-11, C# and .Net, JavaScript/TypeScript with Angular, Oracle, Spring 4-5 (as well as Spring Boot).

• Responsibilities:

  - Develop business and technical features for old and new applications
  - Prototype Ideas (we have many internal technical projects, we plan to rewrite all our legacy components in 1-2 years in Spring Boot and Spring Cloud, we play with Kotlin and Groovy)
  - Configure and maintain Windows and Linux environments (we own many environments, install agents and software, patch, monitor, etc)
  - Integrate our components with different internal and external client's systems
  - Configure, monitor, and troubleshoot Application servers (Tomcat, Weblogic)
  - Monitor applications, processes, scheduled jobs, collect different types of logs and metrics (ELK, ITRS, Autosys)
  - Setup and improve CI/CD (Jenkins, TeamCity, IBM Urban Deploy, Bash)
  - Automate routine with scripting languages (Groovy, Bash)
  - Write all types of tests: unit, integration, end-to-end
  - Design distributed applications (we deploy everything on more than one server, use load balancing and clusters, prefer lightweight and stateless solutions, extract functionality into small services, switch from monolith to microservice architecture)

• Mandatory Skills Description:

  - Strong Java SE and Java EE with at least 10 years of commercial experience
  - Strong Spring knowledge (Boot, IoC, MVC, AOP, Security, Data, JDBC, Test)
  - Good knowledge of SQL and relational databases (Oracle)
  - Good understanding of Servlets, Servlet containers (Tomcat) and application servers (Weblogic)
  - Good understanding of CI/CD, experience with TeamCity or/and Jenkins
  - Hands-on user experience with Linux (navigation, work with files and folders, work with permissions, users and groups, work with processes and services, understanding of keys and certificates, simple Bash scripting)
  - Ability to dive into the problem, find effective and clean solutions, discuss them with the team and implement the best one when everyone is on the same page

UKAD is looking for a Java Developer with conversational German to join a project for our German client.
 

About the Project

The project focuses on Risk-Based Pricing and involves implementing extended functionality for interest rate calculations in a car loan system.

You will join a small team of 3 developers, working closely with German-speaking colleagues.
 

Tech Stack

• Java 17 / 26
• Spring Boot
• RabbitMQ
• Kubernetes (k8s)
• AWS
   

Requirements

• Commercial experience with Java development
• Good knowledge of Spring Boot
• Experience with RabbitMQ
• Familiarity with Kubernetes and AWS
• Conversational German (B1/B2 or higher)
• Ability to communicate effectively and collaborate within a German-speaking team
• Good communication skills and a proactive approach to problem-solving
   

We Offer

• Remote or hybrid work
• Flexible working hours. You can start your working day between 08:00 and 11:00
• Full-time employment
• Professional development and mentoring
• Support for conferences, courses, and meetups
• Equipment provided for work
• Social benefits package
• A friendly, collaborative team with minimal bureaucracy
• Challenging technical tasks and the opportunity to work with modern development and AI tools

Some facts about UKAD to help you make a decision

During 2022-2025, we only increased cooperation with our foreign partners.

UKAD combines benefits of family-sized companies, like no bureaucracy, easy access to the executives, with sustainable growth and vast opportunities.

Our company is strong enough to be not just a vendor but a tech partner. We can afford to choose customers that respect developers.

UKAD is one of the leading employers in Kharkiv, according to DOU.

We never hire people for projects, but to build the team, so if the project ends, you remain a part of UKAD.

Aren't we the company you're looking for?

Company Description
 

Join Sigma Software as a Principal Software Engineer and help shape secure, large-scale digital platforms for Public Sector initiatives. This is a strategic senior-level role for an experienced engineering leader who can combine hands-on development, architecture expertise, technical leadership, and customer-facing communication.
 

You will work with enterprise-grade Java-based solutions, participate in presales and discovery activities, define technical strategies, and guide teams through project launch and early delivery stages.
 

We at Sigma Software create impactful solutions for global Customers and support our engineers with professional growth opportunities, mature engineering culture, and the ability to influence projects from the earliest stages.
 

CUSTOMER

Our Customers operate within Public Sector environment where security, reliability, scalability, and regulatory compliance are critical. The projects focus on building and modernizing enterprise digital services that support mission-critical operations, complex integrations, and long-term maintainability for large-scale organizations.
 

PROJECT

You will join early-stage initiatives where technical leadership plays a key role in transforming business ideas into scalable implementation strategies. The position involves participation in presales activities, tenders, discovery workshops, architecture design, estimation, and project launch support.

The projects include enterprise Java ecosystems, cloud-native infrastructure, distributed systems, secure integrations, and modernization of legacy platforms. You will work closely with Customers, Sales, Delivery, and engineering teams to establish architecture standards and ensure successful project initiation.

Responsibilities:

• Participate in presales activities, discovery sessions, technical workshops, tenders, and RFI/RFP analysis.
• Translate business requirements into scalable technical solutions and implementation strategies.
• Design enterprise-level architectures for Java-based distributed systems and microservices platforms.
• Prepare technical proposals, estimations, architecture diagrams, delivery assumptions, and implementation roadmaps.
• Define technology stack, infrastructure approach, integrations, security principles, and team composition.
• Present and defend technical solutions during Customer discussions and stakeholder meetings.
• Support Sales and Delivery teams during presales and project initiation phases.
• Lead technical project start-up activities and transform high-level concepts into actionable implementation plans.
• Establish architecture standards, engineering guidelines, and development best practices.
• Guide engineering teams during the first delivery stages and support onboarding and technical interviews.
• Conduct architecture and code reviews to ensure scalability, maintainability, and security compliance.
• Resolve complex technical challenges and mentor Senior and Lead Engineers.
• Drive technical decision-making while balancing business goals, delivery timelines, and quality expectations.

Requirements:

• 5+ years of software engineering experience with strong technical leadership responsibilities.
• Strong hands-on expertise in Java ecosystem development.
• Deep knowledge of Spring and Spring Boot.
• Strong understanding of microservices and distributed systems architecture.
• Experience designing and implementing REST APIs and event-driven systems.
• Practical experience with Kafka or similar messaging technologies.
• Experience with relational and NoSQL databases.
• Strong cloud platform experience with AWS, Azure, or GCP.
• Experience with Docker, Kubernetes, CI/CD pipelines, and infrastructure automation.
• Understanding of application security, monitoring, logging, and observability practices.
• Experience working with incomplete or ambiguous requirements and converting them into technical solutions.
• Experience participating in presales, discovery phases, solution proposals, or tender processes.
• Strong estimation and solution design skills.
• Excellent Customer-facing communication and presentation skills.
• Ability to independently drive technical initiatives and take ownership.
• Upper - Intermediate English level.

Приєднуйтесь до Sigma Software на позицію Principal Software Engineer та допомагайте створювати безпечні цифрові платформи великого масштабу для ініціатив у сфері Public Sector. Це стратегічна позиція senior-рівня для досвідченого інженерного лідера, який може поєднувати розробку, архітектурну експертизу, технічне лідерство та комунікацію з клієнтами.
 

Ви працюватимете з enterprise-рішеннями на базі Java, братимете участь у presales та discovery-активностях, визначатимете технічні стратегії та супроводжуватимете команди під час запуску проєктів і на ранніх етапах реалізації.

У Sigma Software ми створюємо значущі рішення для глобальних Клієнтів та підтримуємо наших інженерів можливостями професійного розвитку, зрілою інженерною культурою та можливістю впливати на проєкти з найперших етапів.
 

КЛІЄНТ

Наші Клієнти працюють у сфері Public Sector, де безпека, надійність, масштабованість та відповідність нормативним вимогам мають критичне значення. Проєкти зосереджені на створенні та модернізації enterprise-цифрових сервісів, які підтримують критично важливі операції, складні інтеграції та довгострокову підтримуваність для великих організацій.

ПРОЄКТ

Ви приєднаєтесь до ініціатив на ранніх етапах, де технічне лідерство відіграє ключову роль у перетворенні бізнес-ідей на масштабовані стратегії реалізації. Позиція передбачає участь у presales-активностях, тендерах, discovery-воркшопах, проєктуванні архітектури, оцінюванні та підтримці запуску проєктів.

Проєкти включають enterprise Java-екосистеми, cloud-native інфраструктуру, розподілені системи, безпечні інтеграції та модернізацію legacy-платформ. Ви тісно співпрацюватимете з Клієнтами, Sales, Delivery та інженерними командами для встановлення архітектурних стандартів та забезпечення успішного запуску проєктів.

Обов’язки:

• Брати участь у presales-активностях, discovery-сесіях, технічних воркшопах, тендерах та аналізі RFI/RFP.
• Перетворювати бізнес-вимоги на масштабовані технічні рішення та стратегії реалізації.
• Проєктувати архітектуру enterprise-рівня для розподілених систем та мікросервісних платформ на базі Java.
• Готувати технічні пропозиції, оцінки, архітектурні діаграми, припущення щодо реалізації та дорожні карти.
• Визначати технологічний стек, підхід до інфраструктури, інтеграції, принципи безпеки та склад команди.
• Презентувати та захищати технічні рішення під час обговорень із Клієнтами та зустрічей зі стейкхолдерами.
• Підтримувати Sales та Delivery команди під час presales та етапів запуску проєктів.
• Керувати технічними активностями на старті проєкту та перетворювати високорівневі концепції на практичні плани реалізації.
• Встановлювати архітектурні стандарти, інженерні рекомендації та найкращі практики розробки.
• Керувати інженерними командами на перших етапах реалізації та підтримувати онбординг і технічні інтерв’ю.
• Проводити архітектурні та code review для забезпечення масштабованості, підтримуваності та відповідності вимогам безпеки.
• Вирішувати складні технічні завдання та менторити Senior і Lead Engineers.
• Керувати процесом прийняття технічних рішень, балансуючи бізнес-цілі, терміни реалізації та очікування щодо якості.

Вимоги:

• 5+ років досвіду у software engineering із сильними обов’язками у сфері технічного лідерства.
• Сильна практична експертиза у розробці в Java-екосистемі.
• Глибокі знання Spring та Spring Boot.
• Глибоке розуміння архітектури мікросервісів та розподілених систем.
• Досвід проєктування та реалізації REST API та event-driven систем.
• Практичний досвід роботи з Kafka або аналогічними технологіями обміну повідомленнями.
• Досвід роботи з реляційними та NoSQL базами даних.
• Сильний досвід роботи з хмарними платформами AWS, Azure або GCP.
• Досвід роботи з Docker, Kubernetes, CI/CD pipeline та автоматизацією інфраструктури.
• Розуміння безпеки застосунків, моніторингу, логування та практик observability.
• Досвід роботи з неповними або неоднозначними вимогами та перетворення їх на технічні рішення.
• Досвід участі у presales, discovery-фазах, підготовці solution proposals або тендерних процесах.
• Сильні навички оцінювання та проєктування рішень.
• Відмінні навички комунікації та презентації у взаємодії з Клієнтами.
• Здатність самостійно вести технічні ініціативи та брати на себе відповідальність.
• Рівень англійської — Upper-Intermediate.

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

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

Responsibilities:

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

Requirements:

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

Description

We are looking for a Senior Java Engineer to join a project focused on financial documentation and document processing solutions within the insurance domain.

You will work on the development and evolution of reliable, scalable backend services, collaborating with an experienced international engineering team and business stakeholders.

Requirements

• 5+ years of professional experience in Java development.
• Strong knowledge of Java 17+.
• Strong hands-on experience with Spring / Spring Boot.
• Solid experience developing REST APIs and microservices.
• Strong understanding of OOP, SOLID principles, design patterns, and clean code.
• Good knowledge of SQL and relational databases such as PostgreSQL or Oracle.
• Experience with Kafka or other messaging technologies.
• Experience with unit and integration testing.
• Good understanding of CI/CD and DevOps practices.
• Experience with Git and modern software development workflows.
• Experience working with Docker and preferably Kubernetes.
• Strong analytical and problem-solving skills.
• Ability to work independently and take ownership of assigned areas.
• Upper-Intermediate or higher English.
• Knowledge of security and compliance requirements in financial services.

Job responsibilities

• Design, develop, and maintain high-quality Java backend applications and services.
• Implement new features and enhancements based on business and technical requirements.
• Develop and maintain RESTful APIs and microservices.
• Participate in technical design and contribute to architectural decisions.
• Write clean, maintainable, and well-tested code.
• Perform code reviews and contribute to engineering best practices.
• Investigate and resolve complex technical and production issues.
• Work with databases, messaging systems, and external integrations.
• Collaborate with Product Owners, Business Analysts, QA engineers, architects, and other developers.
• Contribute to system performance, reliability, security, and scalability improvements.
• Participate in CI/CD, deployment, and production support activities.

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

Job responsibilities

• Design and develop highly scalable, reliable web scale applications, tools, and automation frameworks to meet business requirements, and contribute to overall system architecture.
• Implement cloud-based microservices leveraging event-driven architectures.
• Collaborate with cross-functional teams to design and build efficient and robust data pipelines for batch, near-real-time, and real-time processing using Java technologies.
• Optimize applications, data pipelines, and microservices for scalability, performance, and efficiency to handle large volumes of data and traffic in a cloud environment.
• Ensure adherence to coding standards, best practices, and software development methodologies. Perform code reviews and provide constructive feedback to peer team members.
• Implement monitoring and alerting solutions to ensure the reliability and availability of applications, data pipelines, and microservices. Participate in troubleshooting and resolution of complex production issues.
• Create and maintain technical documentation, including design documents, component/service architecture diagrams, and system documentation.
• Collaborate effectively with cross-functional teams, including product management, QA, and operations. Communicate technical concepts and solutions to both technical and non-technical stakeholders.

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
• Contribute to the platform's evolution toward AI-assisted and data-driven capabilities
• Collaborate closely with Product, DevOps, and Architecture teams

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
• Comfortable working asynchronously in a distributed, international team
• Clean Code mindset - SOLID principles, maintainability, and genuine ownership

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
• Fully remote setup with flexible hours and an international, highly skilled team
• Exposure to modern cloud-native, AI-assisted, and Open Banking systems

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 

 

Project Description:

You will join a Regulatory Reporting Platform within a large US investment bank. The platform is responsible for collecting, processing, and transforming large volumes of data from multiple internal systems to produce regulatory reports for 240 jurisdictions worldwide. In total, the platform supports around 10,000 reports across a wide range of regulatory, compliance, financial, and risk reporting areas.
This is a large-scale, business-critical data platform operating in a highly regulated environment, where data accuracy, quality, traceability, and timely delivery are essential. The team works on building and enhancing data pipelines, implementing reporting logic, ensuring data validation and reconciliation, and supporting the generation of complex regulatory outputs.
The project is delivered by a global distributed team with colleagues located in Ukraine, Poland, and the US, offering close collaboration with engineers, analysts, and business stakeholders across multiple regions.

Responsibilities:

- Design, develop, and maintain solutions for a large-scale Regulatory Reporting Platform
- Build and enhance data processing pipelines using Java and Apache Spark
- Implement scalable logic for data ingestion, transformation, aggregation, and enrichment from multiple internal data sources
- Develop and optimize batch processing jobs to support the generation of regulatory reports across multiple jurisdictions
- Ensure high standards of data quality, validation, reconciliation, and consistency throughout the reporting lifecycle
- Translate business and regulatory requirements into robust technical solutions
- Collaborate with business analysts, QA engineers, and cross-functional teams to deliver reporting functionality
- Investigate and resolve data and application issues in development, test, and production environments
- Improve application performance, scalability, and reliability for high-volume data processing workloads
- Contribute to the design and implementation of reusable components and engineering best practices
- Participate in code reviews, testing, and release activities to ensure high-quality deliverables
- Work closely with distributed teams across Ukraine, Poland, and the US in an agile delivery model
- Support continuous improvement of the platform, including monitoring, troubleshooting, and operational stability

Mandatory Skills:

- 6+ years of commercial experience with Java
- Experience in designing and developing scalable, high-performance backend applications
- Good knowledge of SQL and working with large datasets from multiple data sources
- Strong problem-solving skills and ability to work effectively in a global distributed team

Nice-to-Have Skills Description:

- Spark and Hadoop knowledge
- Experience in financial services, investment banking, or regulatory reporting projects
- Familiarity with data quality, reconciliation, and control frameworks
- Experience working with large-scale enterprise data platforms
- Knowledge of cloud environments and modern data platform architectures
- Understanding of CI/CD practices and automated deployment pipelines
- Experience working in Agile / Scrum teams within a distributed global setup

Recruitment process:

1. CV Review — the project team reviews your experience and its relevance to the position.
2. Coderbyte Test — an online coding assessment.
3. Technical Interview — a technical discussion with our interviewer.
4. Project Management Interview (PMI) — a discussion about your experience, communication, and project fit.
5. Karat Interview — the first technical interview with the client.
6. Client Interview — the final interview with the client’s project team.

!!! Location: only Poland !!! 

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:

Our client is a major online gaming operator building a next-generation transactional platform for user account management. This is a greenfield project designed to operate in a highly regulated, high-volume environment and support millions of concurrent users. The platform will process financial transactions in real time and must ensure high availability, sub-second performance, data integrity, security, and full auditability. One of the key engineering challenges is maintaining reliability and performance during extreme traffic spikes and peak events. 

The team is looking for strong technical expertise to help design and build a scalable, high-performance, and reliable backend platform that can meet strict security, regulatory, and compliance requirements.

About the Role:

As a Senior Java Engineer, you will design and build the core backend services of the PAM platform from the ground up. You will own features end-to-end, from technical design and implementation to automated testing, production monitoring, and release. You will work closely with Principal Engineers on architecture and technical decisions, contribute to RFCs, and deliver production-ready code. You will have a high level of autonomy and real influence over the platform’s design, while taking strong ownership of reliability, performance, and correctness in a critical financial system.

Key Responsibilities:

• Design and build backend services in Java 17+ (Spring Boot or similar) for wallet transactions, ledger entries, payment orchestration, bonus mechanics, and account state management.
• Develop REST APIs and event-driven integrations using Kafka or similar technologies for player-facing frontends, operations tooling, and external partners.
• Ensure correctness and reliability through idempotent operations, clear transaction boundaries, explicit failure handling, and strong unit, integration, and contract testing.
• Embed regulatory requirements into the platform, including KYC/AML checks, responsible gaming controls, and audit trails.
• Ensure production readiness with metrics, structured logging, distributed tracing, alerting, and participation in on-call rotations.
• Contribute to technical design and RFCs, participate in code reviews, and mentor other engineers.
• Use AI-assisted development tools as part of the daily workflow, following platform standards for context and prompts.
• Support live migration from the existing third-party platform, including parity testing, data validation, and cutover coordination.

Required Competence and Skills:

• 5+ years of backend engineering experience with strong hands-on expertise in Java 17+ and a modern framework such as Spring Boot.
• Proven experience building and operating high-integrity transactional systems such as payments, wallets, billing, banking, e-commerce, or gaming.
• Strong relational database expertise (PostgreSQL or equivalent), including schema design, ACID transactions, locking, and performance tuning.
• Experience with event-driven architecture and messaging (Kafka, RabbitMQ, or similar), including idempotency and retry mechanisms.
• Strong testing practices, including automated unit, integration, and contract tests as part of the standard development process.
• Hands-on production experience with containers, CI/CD pipelines, monitoring/telemetry, and production incident troubleshooting.
• Solid understanding of multi-threading, system architecture, and fault-tolerant design patterns.
• Good written and spoken English, with experience working effectively in distributed, multi-time-zone teams.

Nice to Have:

• Experience in iGaming, sports betting, fintech, or another regulated, high-transaction-volume domain.
• Exposure to Kubernetes and AWS, including VPC, IAM, EKS, and auto-scaling.
• Experience with compliance-driven development, including KYC/AML, responsible gaming, and audit requirements.
• Experience with AI coding assistants and agentic development workflows.
• Polish and/or Spanish language skills.

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.