Senior Backend Engineer

🏢 Summary: Senior Full Stack Developer role focused on designing and implementing high-quality Java-based applications within a microservices architecture. The position involves backend development with Spring Boot, database integration, containerized deployments, and collaboration in an agile team environment. The role emphasizes code quality, operational excellence, and modern DevOps practices. 🗂️ Requirements: 5-6 years of experience in software development, Proven experience with Java, Experience with Spring or Quarkus, Strong proficiency in relational databases, Experience with Docker, Experience with Kubernetes, Experience with GitLab, Experience with Maven, English level B2 or higher 📃 Skills: Java, Spring, Quarkus, SQL, Oracle, Postgres, Docker, Kubernetes, GitLab, Maven, Angular, Kafka, ActiveMQ, Helm, Microservices 🏢 Description: Summary The purpose of the Senior Full Stack Developer role is to design and implement high-quality software solutions while collaborating within a team. This position focuses on leveraging a well-defined technology stack and ensuring the operational excellence of applications. Responsibilities: Develop and maintain robust applications using JAVA and Spring Boot. Work on microservices architecture. Manage application deployment using Helm Charts. Collaborate effectively with team members and communicate openly. Ensure code quality and adhere to best practices in software development. Maintain knowledge of UI frameworks, particularly Angular. Utilize messaging systems like ActiveMQ or event platforms like Kafka as needed. Handle relational databases (e.g., Oracle, Postgres). Must Haves: Proven experience with Java and Spring (or Quarkus). Strong proficiency in relational databases. Minimum of 5-6 years of working experience. Familiarity with Docker, Kubernetes, GitLab, and Maven. Nice to Haves: Experience with Angular UI frameworks. Knowledge of microservices. Experience with message brokers like ActiveMQ or event-streaming platforms like Kafka. Fluency in German. Other Details: Language Proficiency: English (B2 level), German is desirable. Soft Skills: Team player, proactive communication, self-organization. Responsibility: Accountability and ownership for projects. Interest: Engagement in the business field of taxes.

🏢 Summary: Senior Java Developer role focused on building and maintaining Java backend applications within a newly established center of excellence in a multinational environment. The position combines hands-on backend development with mentoring responsibilities, active participation in architecture discussions, and CI/CD practices. It offers a collaborative, non-hierarchical setup with a hybrid work model. 🗂️ Requirements: Higher education degree, 5+ years of experience in Java Backend development, Strong proficiency in Spring and Spring Boot, Experience with relational databases (Oracle, PostgreSQL, SQL), Experience with JPA and Hibernate, Knowledge of microservices-based and hexagonal architecture, Experience with CI/CD tools and practices, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, Oracle, PostgreSQL, SQL, JPA, Hibernate, Microservices, HexagonalArchitecture, CICD, Angular, AWS, Scrum, Agile 🏢 Description: Summary: The role of a Senior Java Developer involves contributing to the establishment of a center of excellence within a leading multinational company. The primary goal is to leverage strong Java development skills in a collaborative, innovative environment while mentoring junior developers. Responsibilities: * Join the establishment of a center of excellence. * Develop and maintain Java backend applications. * Mentor and coach junior team members (Senior role). * Facilitate onboarding and serve as a role model (Lead role). * Collaborate in a horizontal organization with no management hierarchy. * Engage in CI/CD practices and application architecture discussions. Must Haves: * Higher education degree. * Strong experience with Java Backend development (5+ years). * Proficiency in Spring/Spring Boot framework. * Experience with Relational Database Management Systems (Oracle, PostgreSQL, SQL). * Familiarity with JPA and Hibernate. * Knowledge of Application architecture (Microservices based, hexagonal…). * Proficiency in CI/CD tools. * English proficiency at B2 level. Nice to Haves: * Experience with Java Frontend frameworks (Angular or similar). * Familiarity with AWS or other cloud platforms. * Problem-solving skills and logical reasoning. * Passion for continuous learning and growth. * Experience in Agile environments and Scrum methodologies. Other Details: * Work Model: 4 days in-office initially, transitioning to 3 days in-office and 2 days remote. * Work Schedule: 43 hours/week in winter and 39 hours/week in summer with additional compensation days.

🏢 Summary: Senior Java Developer role focused on building and maintaining Java backend applications within a center of excellence, contributing to architecture decisions and CI/CD processes. The position involves working in a collaborative, non-hierarchical environment and mentoring junior developers. It requires strong backend expertise and active participation in modern microservices-based architectures. 🗂️ Requirements: Higher education degree, 5+ years of Java backend development experience, Strong knowledge of Spring and Spring Boot, Experience with relational databases (Oracle, PostgreSQL), Proficiency in SQL, Experience with JPA and Hibernate, Knowledge of microservices-based architecture, Experience with CI/CD tools and processes, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, SQL, Oracle, PostgreSQL, JPA, Hibernate, Microservices, CI/CD, Angular, AWS 🏢 Description: Summary: The role of a Senior Java Developer involves contributing to the establishment of a center of excellence within a leading multinational company. The primary goal is to leverage strong Java development skills in a collaborative, innovative environment while mentoring junior developers. Responsibilities: * Join the establishment of a center of excellence. * Develop and maintain Java backend applications. * Mentor and coach junior team members (Senior role). * Facilitate onboarding and serve as a role model (Lead role). * Collaborate in a horizontal organization with no management hierarchy. * Engage in CI/CD practices and application architecture discussions. Must Haves: * Higher education degree. * Strong experience with Java Backend development (5+ years). * Proficiency in Spring/Spring Boot framework. * Experience with Relational Database Management Systems (Oracle, PostgreSQL, SQL). * Familiarity with JPA and Hibernate. * Knowledge of Application architecture (Microservices based, hexagonal…). * Proficiency in CI/CD tools. * English proficiency at B2 level. Nice to Haves: * Experience with Java Frontend frameworks (Angular or similar). * Familiarity with AWS or other cloud platforms. * Problem-solving skills and logical reasoning. * Passion for continuous learning and growth. * Experience in Agile environments and Scrum methodologies. Other Details: * Work Model: 4 days in-office initially, transitioning to 3 days in-office and 2 days remote. * Work Schedule: 43 hours/week in winter and 39 hours/week in summer with additional compensation days.

🏢 Summary: Senior Software Engineer responsible for defining technical standards and architecture, leading backend and frontend development, and ensuring secure, scalable, and observable solutions. The role drives CI/CD, enterprise integrations, and production support while aligning engineering practices with product and operations goals. 🗂️ Requirements: Proven experience defining technical standards and architecture, Experience with CI/CD orchestration, Experience with observability implementation, Experience implementing on-premises, hybrid, and cloud solutions, Experience leading backend and frontend architectural decisions, Experience maintaining CI/CD pipelines, Experience coordinating enterprise integrations, Knowledge of DDD and clean architecture, Expertise in Java and Spring Boot, Expertise in Python and FastAPI, Expertise in React or Angular, Experience with L2/L3 production support, Experience with Spring Security and OAuth 📃 Skills: Java, SpringBoot, Python, FastAPI, React, Angular, CICD, Observability, ServiceNow, Jira, Boomi, DDD, OAuth, SpringSecurity 🏢 Description: To strengthen the team, we are seeking a person for the role of Senior Software Engineer, responsible for defining technical standards and architecture, guiding the development team, ensuring quality practices, security, and CI/CD, and collaborating with product and operations in delivering scalable, business-aligned solutions. Main Responsibilities Define technical standards, architecture, and development practices, ensuring quality, security, performance, and resilience in production environments. Orchestrate end-to-end delivery with CI/CD and observability while promoting responsible autonomy among teams aligned with product and operational objectives. Implement on-premises, hybrid, and cloud solutions with security best practices, observability, and integration with existing systems. Lead architectural decisions in backend and frontend (Java/Spring Boot, Python/FastAPI, React/Angular), ensuring scalability, consistent testing and code reviews. Implement and maintain end-to-end CI/CD pipelines and observability (logs, metrics, distributed tracing). Coordinate enterprise integrations (ServiceNow, Jira, CRMs) and iPaaS (e.g., Boomi), including mapping, validation, and compliance. Apply practices such as DDD, clean architecture, application security, and secrets/IAM management throughout the development lifecycle. Provide technical guidance to the team, elevate quality standards, and align practices with product and operations. Lead L2/L3 support in production: incident triage and resolution, prevention escalation (on call), SLA management, and conducting post-mortems focused on root causes and corrective actions. Operate and evolve applications in on-premises, hybrid, or cloud environments: VMs, networks, VPNs, certificates, Nginx/reverse proxy, load balancing, and enhancing the security of exposed services. Key Requirements Proven ability to define technical standards, architecture, and development practices. Experience with CI/CD orchestration and observability practices. Knowledge of implementing on-premises, hybrid, and cloud solutions with security best practices. Leadership in architectural decisions for backend and frontend technologies. Experience with maintaining CI/CD pipelines and end-to-end observability. Ability to coordinate enterprise integrations and ensure compliance. Mastery of practices such as DDD and clean architecture. Technical expertise in Java/Spring Boot, Python/FastAPI, React/Angular. Experience in providing L2/L3 technical support and leading incident resolution. Expertise in security practices, including Spring Security and OAuth. Nice to Have Experience with Docker, Kubernetes, and cloud environments (Azure/AWS/GCP). Background in data management with PostgreSQL, MongoDB, and Redis. Familiarity with AI models, particularly RAG. Knowledge in security access management and policies based on the principle of least privilege.

🏢 Summary: Senior Java Developer role focused on designing, building, and maintaining scalable, secure, high-performance backend systems using modern Java and cloud-native technologies. The position involves working in Agile teams, leading technical discussions, mentoring developers, and driving DevOps automation. Hybrid work model with regular presence in the Warsaw office. 🗂️ Requirements: 8+ years of backend development experience, Proficiency in Java 17+, Experience with Spring Boot and Spring Security, Strong knowledge of Hibernate and JPA, Experience with Maven, Strong SQL skills with PostgreSQL, Experience in cloud-native application development, Hands-on experience with Git and GitHub pipelines, Experience with CI/CD tools, Experience with Kubernetes and Helm, Ability to write Bash/Shell scripts, Experience with JUnit, AssertJ, and Hamcrest, Degree in Computer Science or equivalent experience 📃 Skills: Java, Spring, SpringSecurity, Hibernate, JPA, Maven, PostgreSQL, SQL, Kubernetes, Helm, Docker, Bash, Git, GitHub, CICD, JUnit, AssertJ, Hamcrest 🏢 Description: Role Overview As a Senior Java Developer, you will design, build, and maintain scalable, secure, and high-performance backend systems. Working closely with cross-functional teams, you’ll drive innovation – including the use of GenAI tools like GitHub Copilot -and mentor other developers. Work mode: hybrid 2-3 days / 5 days at the Warsaw office. Key Responsibilities Backend & DB: Develop robust, multi-tenant applications using Java 17+, Spring Boot, and PostgreSQL. DevOps & Automation: Manage deployments using Docker, Kubernetes, and Helm; automate tasks via Bash/Shell scripting. Leadership & Agile: Lead design discussions, mentor peers, and actively participate in Scrum events within a distributed team. Requirements Technical Skills: Java Stack: Java 17+, Spring (Boot, Security), Hibernate/JPA, Maven. Data & Cloud: SQL (PostgreSQL), cloud-native application development. DevOps & CI/CD: Git/GitHub (pipelines), CI/CD tools, Kubernetes, Helm, Bash. Testing: JUnit, AssertJ, Hamcrest. Skills & Experience: 8+ years of professional backend experience (preferably in enterprise environments). Degree in Computer Science (or equivalent experience). Fluent English ( B2/C1 ) and strong collaboration skills in Agile teams. Nice-to-Have Kafka & Event-driven / Microservices architecture. Python, C, or Go (Golang) scripting. Monitoring tools (Kibana, Grafana, Prometheus). Security best practices (OWASP Top 10) & Jira. Client A global leader with a sharp focus on lottery solutions. A confident step forward building on a long history of delivering safe and secure technology, demonstrating strong commitment to customers as a dedicated lottery service provider. Leveraging collective insight, experience, and expertise to create reliable and engaging solutions that help lottery clients achieve objectives, meet player needs, and deliver meaningful benefits to communities.

🏢 Summary: Senior Java Developer role focused on designing and implementing enterprise-grade backend solutions using modern architecture principles. The position emphasizes high code quality, performance, security, and collaboration within a distributed team. The role involves working with Java 17+, Spring ecosystem, databases, and event-driven systems. 🗂️ Requirements: Minimum 5 years of commercial software development experience, Very good knowledge of Java 17+, Strong understanding of object-oriented design patterns, Experience with Spring MVC and Spring Data, Experience with Apache Kafka, Ability to design relational and non-relational databases (MS SQL, Oracle, Elasticsearch, Redis), Knowledge of software engineering best practices, English proficiency for technical documentation, Ability to work effectively in a distributed team 📃 Skills: Java, Spring, SpringMVC, SpringData, Kafka, MSSQL, Oracle, Elasticsearch, Redis, OOP, UML, Docker, Kubernetes, Azure, JavaScript, React, Python 🏢 Description: We are looking for an experienced Senior Java Developer with at least 5 years of commercial experience to join a team working on enterprise-grade backend solutions. The role focuses on designing and implementing software in a modern architecture, with a strong emphasis on code quality, performance, security, and effective collaboration within a distributed team. Responsibilities Design and implement software using hexagonal architecture. Develop backend solutions using Java 17+ and the Spring ecosystem. Ensure high code quality and compliance with agreed development standards. Analyse system performance, security, and stability, and propose improvements. Design and optimise data structures for relational and non-relational databases. Collaborate with a distributed team, participate in technical analysis, code reviews, and solution design. Identify technical challenges and propose improvements to architecture and implementation. Requirements Minimum 5 years of commercial software development experience. Very good knowledge of Java 17+. Strong understanding of object-oriented design patterns and software engineering best practices. Experience with the Spring stack, especially Spring MVC and Spring Data. Knowledge of Apache Kafka. Ability to design databases: relational: MS SQL, Oracle, non-relational: Elasticsearch, Redis. English skills sufficient to work with technical documentation. Strong analytical and creative problem-solving skills. Excellent communication skills and ability to work effectively in a distributed team. Nice to have Knowledge of scripting/frontend technologies such as JavaScript, React, Python. Experience working in an Azure cloud environment. Familiarity with Kubernetes and Docker. Ability to design system architecture and prepare High-Level Design (HLD) documentation. Knowledge of UML and flow diagrams.

🏢 Summary: The role involves developing and maintaining scalable backend services for business-critical applications using Java within an agile environment. The position focuses on building RESTful APIs, implementing persistence layers, and ensuring system quality and stability. The developer collaborates on code reviews, debugging, and continuous improvement of backend solutions. 🗂️ Requirements: Strong experience with Java 17+, Hands-on experience with Spring, Hands-on experience with Spring Boot, Knowledge of Hibernate and ORM concepts, Experience with PostgreSQL, Experience with Git version control platforms, Strong debugging skills, Experience in agile development environments 📃 Skills: Java, Spring, SpringBoot, Hibernate, PostgreSQL, REST, Git, ORM 🏢 Description: Backend Developer (Java) We are looking for a Backend Developer to join a development team responsible for building and maintaining backend services for business-critical applications. The role focuses on developing scalable, maintainable solutions and contributing to the overall quality and stability of the system within an agile setup. Responsibilities: Develop and maintain backend services using Java 17+ Design and implement RESTful APIs with Spring and Spring Boot Work with relational databases, including schema design and query optimization in PostgreSQL Implement persistence layers using Hibernate Debug, troubleshoot, and resolve backend issues Collaborate with the team using a GitHub-like platform, including code reviews and version control Participate in agile ceremonies and contribute to continuous improvement Requirements: Strong experience with Java 17+ Hands-on experience with Spring and Spring Boot Knowledge of Hibernate and ORM concepts Experience working with PostgreSQL Familiarity with GitHub-like platforms and team workflows Strong debugging and problem-solving skills Experience working in agile development environments

🏢 Summary: Senior Java Developer role focused on designing and implementing complex Java-based solutions for large-scale enterprise or public sector projects. The position involves hands-on development, architectural contribution, and mentoring junior team members. The role requires strong expertise in modern Java ecosystems and enterprise integration environments. 🗂️ Requirements: Minimum 5 years of professional Java experience, Strong knowledge of Spring Boot and RESTful APIs, Experience with JUnit and Mockito testing frameworks, Experience with OpenShift and Helm, Experience with Spring Data or JPA ORM frameworks, Minimum 1 year experience with Oracle or PostgreSQL, Minimum 2 years experience with Gradle for CI, Experience in large-scale enterprise or public sector projects, Degree in Computer Science or equivalent, German C1 and English B1 proficiency 📃 Skills: Java, SpringBoot, REST, JUnit, Mockito, OpenShift, Helm, SpringData, JPA, Oracle, PostgreSQL, Gradle 🏢 Description: Summary: The Senior Java Developer plays a crucial role in designing and implementing complex Java-based solutions, mentoring other team members, and contributing to large-scale projects in either the enterprise or public sectors. Main Responsibilities: Design and implement complex Java-based solutions. Mentor junior developers and assist in team knowledge sharing. Manage and contribute to large-scale enterprise or public-sector projects. Key Requirements: Fluent in German (C1) and English (min. B1). Degree in Computer Science or equivalent. Minimum of 5 years of professional experience in Java Strong understanding of Spring Boot, RESTful APIs, testing frameworks (JUnit, Mockito) Experience in OpenShift and Helm charts and ORM frameworks like Spring Data or JPA Knowledge of Oracle or PostgreSQL (min. 1 year). Experience with Gradle for continuous integration (min. 2 years). Experience with large public sector projects or comparable private sector engagements. Nice to Have: Additional years of experience with core technologies beyond the stipulated minimum. Frontend experience with React and TypeScript, and understanding of Ajax (min. 1 year). Experience with complex enterprise application integration.

🏢 Summary: Senior Backend Engineer role focused on defining the technical direction and architecture of a domain within a borderless financial platform. The position involves designing scalable microservices, driving architectural decisions, and leading a small backend team in a distributed environment. The role emphasizes reliability, security, and high‑volume transaction processing in a cloud-based ecosystem. 🗂️ Requirements: 4-7 years backend engineering experience, Proficiency in Go, Experience with Java 21 or modern Java, Experience designing microservices with clear contracts, Experience with caching strategies including TTL and invalidation, Experience with event-driven or asynchronous architectures, Experience with structured logging, metrics, and alerting, Experience with AWS services, Experience with relational and non-relational databases, Experience with Spring Boot or similar frameworks, Experience reviewing code and architectural decisions, Availability to work in GMT+5:30 timezone 📃 Skills: Java, Go, Spring, JDBI, PostgreSQL, CockroachDB, DynamoDB, Redis, SQS, SNS, Kafka, AWS, EKS, ALB, RDS, S3, Kong, Datadog, Quickwit, JWT, RBAC, TLS, Docker, ArgoCD, GitHub, Microservices, Kafka, CDC 🏢 Description: Project overview This project focuses on developing a borderless financial platform that supports international banking flows, payments, account management and regulatory compliant operations. The product handles sensitive data and high volume transactions while prioritising reliability and security. Team You will work in a distributed environment with backend engineers, a product manager and platform specialists. The role involves leading a sub team of three to five engineers, conducting design reviews, ensuring code quality standards and supporting collaborative decision making. Position overview We are looking for a Senior Backend Engineer who will define the technical direction of a backend domain and drive architectural decisions. You will design microservices, create scalable solutions, guide a small engineering group and collaborate closely with product specialists to shape the delivery roadmap. We are looking for a person willing to work in the time zone: GMT+5:30. Technology stack Java 21, Go, Spring Boot, JDBI, custom workflow engines, PostgreSQL, CockroachDB, DynamoDB, Redis, SQS, SNS, Kafka, AWS EKS ALB RDS S3 Secrets Manager, Kong API Gateway, Datadog, Quickwit, JWT RBAC TLS request and response encryption VAPT, GitHub Actions, Docker, ArgoCD, microservices, event driven architecture, saga and orchestration patterns, CDC pipelines, maker checker workflows Responsibilities Plan and design backend microservices with clear boundaries and contracts Develop solutions for domains such as onboarding, payments, transaction orchestration or platform components Break complex epics into actionable tasks with clear acceptance criteria Review designs from other engineers to ensure scalability and fault tolerance Drive technical decisions including caching layers, asynchronous processing strategies, database choices and API versioning Evaluate build versus buy options for integrations and services Collaborate with a product manager to align on scope and prioritisation Lead a sub team of backend engineers and support their professional growth Support incident response, root cause analysis and long term improvements Monitor service performance using logging, metrics and tracing tools Requirements Professional backend engineering experience from 4-7 years Experience with Go (tooling & CLIs) Experience designing microservices with well-defined contracts and boundaries Experience with Java 21 or modern Java versions Experience with caching strategy design, including TTL and invalidation approaches Experience working with asynchronous processing, event-driven architecture, or queue-based workflows Experience using structured logging, metrics, and alerting to debug production systems Experience in making build versus buy decisions with clear trade-off analysis Experience reviewing code and identifying architectural or contract issues Experience with AWS-based services Experience working with relational and non-relational databases such as PostgreSQL or DynamoDB Experience writing backend services using Spring Boot or similar frameworks Nice to have Experience with financial or payments related systems Experience with KYC or AML flows Experience with workflow or orchestration engines Experience with platform wide pattern creation or reusable service design Experience with data encryption practices and security audits Experience with CockroachDB or high availability distributed databases What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)

🏢 Summary: The role involves designing and developing scalable backend systems in a microservices architecture using Java or Kotlin and Spring. The engineer will influence technical decisions while building payment and subscription platforms with event-driven communication and cloud-based solutions. The position includes working with modern architectural patterns and ensuring high code quality through testing and reviews. 🗂️ Requirements: Strong experience with Java and/or Kotlin, Solid knowledge of Spring and Spring Boot, Hands-on experience with SQL and relational databases, Experience with PostgreSQL, Proven experience with microservices architecture, Experience with event-driven systems, Practical experience with JUnit, Mockito, Testcontainers, Experience with AWS or GCP, Understanding of DDD, CQRS, Hexagonal Architecture, Experience with payment or subscription systems 📃 Skills: Java, Kotlin, Spring, SpringBoot, SQL, PostgreSQL, Microservices, Kafka, JUnit, Mockito, Testcontainers, AWS, GCP, DDD, CQRS, HexagonalArchitecture 🏢 Description: Senior Backend Engineer (Java/Kotlin) We are looking for an experienced Backend Engineer to join a team building modern, scalable systems based on a microservices architecture. This role offers real influence over technical decisions, system architecture, and the quality of delivered solutions—particularly within payment and subscription platforms. Responsibilities Design, develop, and maintain backend systems using Java or Kotlin and the Spring Framework Build and evolve microservices following DDD , CQRS , and Hexagonal Architecture principles Implement event-driven communication , ideally using Apache Kafka Work with relational databases ( PostgreSQL or other SQL databases ) and optimize queries Write unit and integration tests using JUnit, Mockito, and Testcontainers Contribute to the design and development of cloud-based solutions ( AWS or GCP ) Participate in code reviews and drive high engineering standards Collaborate closely with product and engineering teams to deliver business-critical features Requirements Strong experience with Java and/or Kotlin Solid knowledge of Spring / Spring Boot Hands-on experience with SQL and relational databases (preferably PostgreSQL ) Proven background in microservices-based architectures Experience with event-driven systems (Kafka is a strong plus) Practical experience with backend testing (JUnit, Mockito, Testcontainers) Experience working with cloud platforms ( AWS or GCP ) Good understanding of Domain-Driven Design (DDD) , CQRS , and Hexagonal Architecture Must-have: experience with payment systems and/or subscription-based platforms Nice to Have Experience working with high-scale, high-availability systems Knowledge of security and transactional data handling Background in product-driven, Agile environments