Java Developer

🏢 Summary: Full-time B2B contract for a Software Architect (Backend & APIs) to design and build a greenfield, scalable analytics and research platform in the financial sector. The role focuses on defining cloud-native backend architecture, APIs, and integration standards to support secure content management and distribution at scale. The project runs from July 2026 to February 2027 and targets institutional clients with future retail expansion. 🗂️ Requirements: 8+ years of professional software engineering experience, Strong experience designing backend architectures and APIs, Hands-on experience with production-grade backend systems, Experience with scalable distributed and cloud-native systems, Ability to define API contracts, versioning, and integration standards, Experience with authentication and authorization mechanisms, Experience leading architectural decisions and technical discussions, Experience across full software development lifecycle, Fluent English (C1 minimum) 📃 Skills: Java, Spring, REST, OpenAPI, PostgreSQL, Docker, Kubernetes, GKE, GCP, APIGateway, ServiceMesh, OIDC, SSO, JWT, Observability, Monitoring, Microservices, DDD, EventDriven, CloudNative, DistributedSystems, AI, LLM 🏢 Description: 📍 Remote 🕒 Full-time 📄 B2B 📅 Project duration: July 2026 – February 2027 About the project We are looking for an experienced Software Architect (Backend & APIs) to join an ambitious greenfield initiative in the financial sector. The project focuses on designing and building from scratch a modern, scalable analytics and research platform that will support the complete lifecycle of premium financial content - from creation and management to publication, distribution, and consumption analytics. The platform will initially serve institutional clients, with a planned expansion toward retail users in later phases. This is a high-impact role for someone who enjoys solving complex architectural challenges, designing systems for scale, and shaping technical direction from the ground up. You will help create a platform that: streamlines and automates financial research workflows structures and manages large volumes of analytical content enables secure and scalable content distribution provides advanced insight into user engagement and content consumption supports future scalability across multiple client segments Your responsibilities Design and evolve scalable backend and API architectures for cloud-native and hybrid environments Define system architecture with strong focus on scalability, maintainability, resilience, and security Design public and internal APIs, including versioning strategy, contracts, backward compatibility, and integration standards Collaborate with sales and delivery teams during technical discovery, estimation, and solution planning Work closely with engineering teams to solve complex backend challenges and improve technical standards Drive architectural decisions and clearly communicate technical trade-offs Collaborate directly with clients and domain experts to clarify requirements and translate business needs into technical solutions Create and maintain architecture documentation, technical proposals, and design decisions Support engineering excellence through improvements in tooling, development practices, and platform standards Explore and apply AI-powered engineering tools to enhance productivity and system capabilities Tech environment You will work with modern backend and cloud technologies, including: Java 21, Spring Boot REST APIs / OpenAPI PostgreSQL Docker, Kubernetes, GKE Google Cloud Platform API Gateway / service mesh solutions Event-driven integrations Authentication & authorization standards (OIDC / SSO / JWT) Observability and monitoring tooling We value strong understanding of modern architectural approaches such as modular systems, domain-oriented design, contract-first APIs, event-driven patterns, and cloud-native distributed systems. Must have 8+ years of professional software engineering experience Strong hands-on experience designing backend architectures and APIs Proven ability to lead architectural discussions and make pragmatic technical decisions Practical experience building and reviewing real production-grade backend systems Strong experience working directly with clients and external stakeholders Excellent communication skills and ability to explain complex technical concepts clearly Experience with scalable distributed systems and cloud-native architectures Transparent, proactive, and solution-oriented mindset Experience across the full software lifecycle - from prototyping to strategic architectural direction Strong command of written and spoken English ( C1 minimum ) Nice to have Experience in the financial sector or highly regulated environments Experience with event-driven architectures and asynchronous integrations Knowledge of modern identity and access management solutions Familiarity with AI-powered development tools, LLM-based workflows, or AI-assisted engineering practices We value your trust in providing us your data, thus we are striving to use commercially acceptable means of protecting it. Below you will find the necessary information about the data we collect and process when you send us your CV. The controller of your personal data is Miquido Spółka z ograniczoną odpowiedzialnością sp. k. with its seat in Krakow, Zabłocie 43a, 30-701 Kraków, Poland (“Miquido”, “We”, “Our” or “Us”).

🏢 Summary: Backend/API engineering role focused on building and maintaining Java-based microservices and RESTful APIs for large-scale digital banking and trading platforms within an Agile/DevOps environment. The position covers full SDLC involvement, including design, development, testing and production support of distributed financial systems. Emphasis is placed on scalability, security and reliability in global teams. 🗂️ Requirements: Experience in Java backend development, Ability to design and develop RESTful APIs, Experience with microservices architecture, Experience with distributed systems, Ability to translate business requirements into technical designs, Experience across full SDLC, Understanding of scalability, security and reliability principles 📃 Skills: Java, REST, Microservices, APIs, SDLC, DevOps, Agile 🏢 Description: Overview Location: Kraków (2 days a week in office) Domain: Digital banking, payments, APIs, trading platforms Environment: Agile + DevOps, global teams Focus: Backend / API development for large-scale financial systems Core Responsibilities Engineering & Delivery Design, develop and maintain Java-based backend services Build and evolve RESTful APIs and microservices for digital banking platforms Translate business requirements into technical designs and implementations Contribute across the full SDLC: Requirements analysis Design Coding Testing Production support Architecture & Systems Work on distributed systems / microservices architecture Design for: Scalability Security Reliability

🏢 Summary: Development of a backend for an AI-native integration platform for financial institutions, focused on orchestrating long-running data processing workflows and system integrations. The role involves building APIs, designing data models, and ensuring reliability, auditability, and security of financial data processing. You will implement scalable, fault-tolerant data pipelines and integration mechanisms in a production environment. 🗂️ Requirements: Minimum 4 years of backend development experience, Very good knowledge of Python, Experience designing and building REST or GraphQL APIs, Practical experience with PostgreSQL (data modeling, queries, schema design), Experience with Docker and basic knowledge of Kubernetes, Experience with production data processing systems, Ability to design scalable and fault-tolerant systems 📃 Skills: Python, REST, GraphQL, PostgreSQL, Docker, Kubernetes 🏢 Description: O projekcie Projekt dotyczy budowy nowoczesnej platformy do zarządzania integracjami oraz transformacją danych w środowisku instytucji finansowych . System umożliwia definiowanie, uruchamianie oraz monitorowanie procesów przetwarzania danych pomiędzy różnymi systemami źródłowymi i docelowymi. Rozwiązanie zostało zaprojektowane jako platforma typu AI-native , w której część procesów konfiguracyjnych i analitycznych jest wspierana przez komponenty wykorzystujące modele AI. Platforma kładzie duży nacisk na niezawodność, audytowalność oraz bezpieczeństwo danych , ze względu na przetwarzanie wrażliwych danych finansowych. Backend systemu odpowiada za orkiestrację długotrwałych procesów przetwarzania danych, integracje z systemami klientów, zarządzanie konfiguracją transformacji oraz pełną historię i śledzenie wykonania procesów. Zadania Projektowanie i rozwój backendu platformy integracyjnej Tworzenie i rozwijanie API (REST / GraphQL) udostępniających funkcjonalności systemu Projektowanie modeli danych oraz schematów w PostgreSQL Implementacja workflowów do orkiestracji długotrwałych procesów przetwarzania danych (np. integracje, transformacje) Budowa mechanizmów integracji z zewnętrznymi systemami klientów Implementacja pipeline’ów przetwarzania danych: ingestia, transformacja, walidacja i dostarczanie danych Zapewnienie wysokiej niezawodności systemu (retry logic, idempotentność, fault tolerance) Implementacja mechanizmów audit loggingu oraz śledzenia historii przetwarzania danych Współpraca z zespołem AI przy integracji komponentów inteligentnych z backendem platformy Implementacja monitoringu, logowania oraz mechanizmów obserwowalności systemu Utrzymywanie wysokiej jakości kodu poprzez testy i code review Wymagania Minimum 4 lata doświadczenia w developmentcie backendowym Bardzo dobra znajomość Python Doświadczenie w projektowaniu i budowie API (REST lub GraphQL) Praktyczna znajomość PostgreSQL (modelowanie danych, zapytania, projektowanie schematów) Znajomość konteneryzacji ( Docker ) oraz podstaw Kubernetes Doświadczenie z systemami przetwarzającymi dane w środowisku produkcyjnym Umiejętność projektowania systemów odpornych na błędy i skalowalnych Znajomość narzędzi wspierających pracę programisty (w tym asystentów AI) Mile widziane Doświadczenie z narzędziami do orkiestracji workflowów (np. Temporal, Prefect, Airflow ) Znajomość architektury event-driven (np. Kafka, RabbitMQ, Azure Service Bus) Doświadczenie w projektowaniu systemów SaaS multi-tenant Doświadczenie w pracy z platformami chmurowymi ( AWS lub Azure ) Praca z systemami przetwarzającymi dane finansowe lub regulowane Znajomość mechanizmów audit trail, data lineage oraz data integrity Doświadczenie z Redis (cache, pub/sub) Podstawowa znajomość integracji backendów z LLM / systemami AI Dlaczego warto Praca nad nowoczesną platformą data & AI dla sektora finansowego Realny wpływ na architekturę oraz rozwój kluczowych komponentów systemu Projekt obejmujący zaawansowane przetwarzanie danych i workflow orchestration Współpraca z zespołem łączącym kompetencje backend, data engineering i AI Możliwość pracy z nowoczesnym stackiem technologicznym i rozwiązywania złożonych problemów systemowych

🏢 Summary: Development of a global credit risk analytics platform in the banking sector, focused on distributed batch processing and 24/7 data pipelines in a cloud and microservices architecture. The role involves building and maintaining Java-based microservices, designing scalable backend systems, and contributing to a long-term cloud transformation to GCP. This is a non-CRUD, high-scale engineering position with real impact on performance, reliability, and architectural decisions. 🗂️ Requirements: 6+ years commercial experience in Java, Experience with distributed systems, Experience with microservices architecture, Strong knowledge of Spring Boot and Spring Cloud, Experience in REST API design, Experience with cloud platforms (GCP required for Tech Lead), Practical experience with Kubernetes, Experience with Terraform and CI/CD, Knowledge of TDD and engineering best practices (SOLID, DRY, KISS, YAGNI), Ability to work with infrastructure, Architectural design experience (Tech Lead), Experience in mentoring and technical leadership (Tech Lead) 📃 Skills: Java, Spring, SpringBoot, SpringCloud, REST, Microservices, SpringBatch, ApacheBeam, ApacheFlink, GCP, Kubernetes, Terraform, Docker, Jenkins, Ansible, Redis, Python, Oracle, PostgreSQL, Dataflow, CI/CD 🏢 Description: Dołącz do zespołu rozwijającego kluczową platformę analityczną w obszarze bankowości globalnej , odpowiedzialną za obliczanie ryzyka kredytowego kontrahentów dla tysięcy klientów na całym świecie. Projekt jest częścią wieloletniej transformacji technologicznej dużej organizacji finansowej, której celem jest migracja systemów do chmury oraz budowa nowej generacji silników analitycznych opartych o nowoczesne technologie open-source. Nie jest to projekt CRUD ani proste API — pracujemy z procesami batchowymi działającymi 24/7 , systemami rozproszonymi oraz zaawansowanymi pipeline’ami danych. Projekt System służy do codziennego wyliczania ekspozycji na ryzyko kredytowe kontrahenta w skali globalnej. Platforma: działa w architekturze mikroserwisowej, funkcjonuje zarówno w Google Cloud Platform , jak i środowisku on-premise, zastępuje rozwiązania vendorowe wewnętrzną platformą analityczną. Projekt rozwijany jest od wielu lat przez zespoły w Azji, a polski zespół przejmuje wiedzę oraz rozwija nowe funkcjonalności. stabilne, długofalowe finansowanie realny wpływ na rozwój platformy rosnący zespół w Polsce Stack technologiczny Backend & Architecture Java 21 Spring Boot / Spring Cloud Microservices / REST APIs Spring Batch Data & Processing Apache Beam Apache Flink GCP Dataflow Cloud & DevOps Google Cloud Platform (GCP) Kubernetes Terraform Docker Jenkins Ansible Dodatkowo Redis Python (sporadycznie) Ali Cloud (część środowiska) Zakres obowiązków rozwój i utrzymanie mikroserwisów Java w obszarze risk analytics projektowanie i implementacja rozproszonych systemów backendowych praca w modelu TDD rozwój procesów batchowych i pipeline’ów danych działających 24/7 współpraca z zespołami międzynarodowymi dbanie o wydajność, niezawodność i skalowalność systemów udział w pełnym cyklu życia produktu (design → development → produkcja) wsparcie produkcji, monitoring i automatyzacja operacji (dla Tech Lead) mentoring oraz wsparcie techniczne zespołu Must Have (Senior) min. 6+ lat doświadczenia komercyjnego w Javie doświadczenie w systemach rozproszonych i mikroserwisach Spring Boot / Spring Cloud REST API design doświadczenie z chmurą (preferowana GCP ) Kubernetes praktyczna znajomość DevOps (Terraform / CI/CD) TDD i dobre praktyki inżynierskie (SOLID, DRY, KISS, YAGNI) samodzielność i gotowość pracy z infrastrukturą Must Have (Tech Lead) Wszystkie wymagania Senior + dodatkowo: silne doświadczenie architektoniczne obowiązkowe doświadczenie z GCP mentoring i prowadzenie techniczne zespołu zdolność podejmowania decyzji technologicznych Nice to Have doświadczenie w bankowości lub fintech Apache Beam / Flink Redis Jenkins / Ansible Oracle lub PostgreSQL Python Zespół i sposób pracy ok. 15 osób w Polsce (2 pody) współpraca z zespołami z Europy i Azji brak on-calli okazjonalnie wcześniejszy start (ok. 8:00) dla overlapu z Azją Agile / DevOps developerzy odpowiadają również za jakość i testy Model pracy: 📍 hybrydowy — biuro w Krakowie (zazwyczaj wtorek–środa) Zobacz, dlaczego warto być w j-labs! Dołączysz do firmy stworzonej przez inżynierów dla inżynierów , która istnieje na rynku od 15 lat. Obecnie zatrudniamy ponad 500 osób . j-labs to stabilność i długofalowa współpraca – około 25% załogi to osoby pracujące już ponad 5 lata! Możesz zmienić projekt – rób to co lubisz, rozwijaj swoje kompetencje, zdobywaj nowe. Robimy dobre IT albo wcale . Technologie, w których pracujemy to m.in . Java 17/21,  Spring, Hibernate, Mikroserwisy,  AWS/Azure/GSP/,  Terraform, Docker, Kubernetes,Kafka Eksperci przyciągają ekspertów - średnie doświadczenie naszych inżynierów wynosi 12 lat , a 30% zostaje zatrudnionych z polecenia . Stawiamy na knowledge sharing i rozwój . Organizujemy Talk4Devs, meet’upy , dajemy Ci przestrzeń do budowania swojej marki osobistej jako prelegent, czy prowadzenia własnych projektów, których rezultaty możesz przedstawiać m.in . na naszym blogu. Dołącz do Gildii Technologicznej l ub stwórz własną - nasze community zrzeszają specjalistów w obszarach : Java , Kotlin, .NET, Frontend, Management, DevOps, Quality Assurance Mamy zakodowane, że jest czas pracy i czas nie pracy, więc bardzo dbamy o to, aby work life balance został zachowany. Otrzymaliśmy w tym roku certyfikat Great Place to Work (aż 80% odpowiedzi w ankiecie dotyczącej różnych obszarów wybierało najwyższe noty, jesteśmy w pierwszej 10 firm z najlepszym wynikiem)

🏢 Summary: Contract role in banking focused on modernizing a legacy corporate banking system into a new digital platform. The position involves developing new features, building and maintaining APIs, and working within a SAFe Agile team to improve customer experience and operational efficiency. Hybrid work model with competitive B2B rate. 🗂️ Requirements: Minimum 6 years of hands-on Java development experience, Experience in building API solutions, Experience with reactive programming, Working knowledge of Spring framework, Working knowledge of Hibernate, Working knowledge of Cucumber, Proficiency in SQL, Experience with REST services, Experience with Microservices architecture, Proficiency with Git, Understanding of SOLID principles, Knowledge of design patterns, Experience working in SAFe Agile environment 📃 Skills: Java, Spring, Hibernate, Cucumber, SQL, REST, Microservices, Git, SOLID, DesignPatterns, SAFe, Reactive 🏢 Description: Industry: Banking Rate: up to 160 pln/h on b2b Location: Hybrid form Warsaw, Gdańsk or Gdynia (3 days per week from office) Summary: The main purpose of this role is to be part of a team responsible for the modernization of banking software, specifically transitioning from a legacy system to a new digital platform for corporate clients. This initiative aims to enhance customer service and improve operational efficiency. Responsibilities: Develop new features and improvements for the corporate banking platform. Collaborate with developers, product owners, architects, analysts, and QA teams. Build and maintain APIs for enhanced customer experience. Ensure compliance with banking services and maintenance requirements. Participate in agile ceremonies and follow SAFE Agile principles. Key Requirements: Minimum 6 years of hands-on experience in Java development. Experience in building API solutions. Familiarity with reactive programming methodologies. Working knowledge of Spring, Hibernate, and Cucumber framework. Proficiency with SQL, REST, Microservices, and GIT. Understanding of SOLID principles and design patterns. Fluency in English. Nice to Have: 2 years experience with Angular. Ability to conduct unit tests using Jasmine.

🏢 Summary: The role involves modernizing corporate banking software by migrating from a legacy system to a new digital platform. The position focuses on developing new features, building and maintaining APIs, and ensuring compliance within a banking environment. The work is delivered in a hybrid model within an agile team following SAFe principles. 🗂️ Requirements: Minimum 6 years of commercial experience in Java development, Experience in building and maintaining APIs, Experience with reactive programming, Working knowledge of Spring, Working knowledge of Hibernate, Working knowledge of Cucumber, Proficiency in SQL, Proficiency in REST, Experience with Microservices architecture, Proficiency in GIT, Understanding of SOLID principles, Knowledge of design patterns, Fluency in English 📃 Skills: Java, Spring, Hibernate, Cucumber, SQL, REST, Microservices, GIT, Reactive, SOLID, Angular, Jasmine 🏢 Description: Industry: Banking Rate: up to 160 pln/h on b2b Location: Hybrid form Warsaw, Gdańsk or Gdynia (3 days per week from office) Summary: The main purpose of this role is to be part of a team responsible for the modernization of banking software, specifically transitioning from a legacy system to a new digital platform for corporate clients. This initiative aims to enhance customer service and improve operational efficiency. Responsibilities: Develop new features and improvements for the corporate banking platform. Collaborate with developers, product owners, architects, analysts, and QA teams. Build and maintain APIs for enhanced customer experience. Ensure compliance with banking services and maintenance requirements. Participate in agile ceremonies and follow SAFE Agile principles. Key Requirements: Minimum 6 years of hands-on experience in Java development. Experience in building API solutions. Familiarity with reactive programming methodologies. Working knowledge of Spring, Hibernate, and Cucumber framework. Proficiency with SQL, REST, Microservices, and GIT. Understanding of SOLID principles and design patterns. Fluency in English. Nice to Have: 2 years experience with Angular. Ability to conduct unit tests using Jasmine.

🏢 Summary: Opportunity to join a team developing a strategic banking platform focused on Front Office supervision through automated reporting and data management. The project uses a modern microservices architecture with AI/ML integration and follows Lean Agile practices in an international environment. Hybrid work model based in Kraków with collaboration across teams in London, Poland, and India. 🗂️ Requirements: 5+ years of experience with Java, Experience with Spring Boot, Experience with microservices, Knowledge of CI/CD, Experience with Docker, Experience with Kubernetes 📃 Skills: Java, SpringBoot, SQL, NoSQL, Kafka, OpenTelemetry, Prometheus, Grafana, Docker, Kubernetes, CI/CD, TDD 🏢 Description: O projekcie Dołączysz do zespołu rozwijającego strategiczną platformę bankową usprawniającą nadzór Front Office poprzez automatyzację raportowania i zarządzania danymi. Nowoczesna architektura mikroserwisowa i integracja AI/ML sprawiają, że projekt jest innowacyjny i kluczowy dla banku. Technologie w projekcie: Backend: Java, Spring Boot Frontend: Nowoczesne UI/UX frameworki Bazy danych: SQL / NoSQL Streaming & Messaging: Apache Kafka Monitoring & Logging: OpenTelemetry, Prometheus, Grafana Metodologia: Lean Agile (zwinne zarządzanie, zespoły w Londynie, Polsce i Indiach) Pokrycie kodu testami: Test-Driven Development (TDD) Lokalizacja: Kraków, praca hybrydowa (2 dni z biura) . Wymagania (must have) Min. 5 lat doświadczenia z Java, Spring Boot Doświadczenie w mikroserwisach Znajomość testów CI/CD, Docker, Kubernetes Wymagania (nice to have): Mile widziane doświadczenie w pracy z Apache Kafka, OpenTelemetry Doświadczenie w bankowości lub systemach nadzorczych

🏢 Summary: The offer is for a Senior Java Developer to build and enhance a strategic banking platform that automates Front Office reporting and data management. The project is based on a modern microservices architecture with AI/ML integration and strong emphasis on quality through TDD. The role involves working in a hybrid model within an international Agile team. 🗂️ Requirements: Minimum 5 years of experience with Java, Minimum 5 years of experience with Spring Boot, Experience with microservices architecture, Experience with CI/CD pipelines, Experience with Docker, Experience with Kubernetes 📃 Skills: Java, SpringBoot, Microservices, CICD, Docker, Kubernetes, SQL, NoSQL, Kafka, OpenTelemetry, Prometheus, Grafana, TDD, AI, ML 🏢 Description: O projekcie Dołączysz do zespołu rozwijającego strategiczną platformę bankową usprawniającą nadzór Front Office poprzez automatyzację raportowania i zarządzania danymi. Nowoczesna architektura mikroserwisowa i integracja AI/ML sprawiają, że projekt jest innowacyjny i kluczowy dla banku. Technologie w projekcie: Backend: Java, Spring Boot Frontend: Nowoczesne UI/UX frameworki Bazy danych: SQL / NoSQL Streaming & Messaging: Apache Kafka Monitoring & Logging: OpenTelemetry, Prometheus, Grafana Metodologia: Lean Agile (zwinne zarządzanie, zespoły w Londynie, Polsce i Indiach) Pokrycie kodu testami: Test-Driven Development (TDD) Lokalizacja: Kraków, praca hybrydowa (2 dni z biura) . Wymagania (must have) Min. 5 lat doświadczenia z Java, Spring Boot Doświadczenie w mikroserwisach Znajomość testów CI/CD, Docker, Kubernetes Wymagania (nice to have): Mile widziane doświadczenie w pracy z Apache Kafka, OpenTelemetry Doświadczenie w bankowości lub systemach nadzorczych

🏢 Summary: Lead Java Engineer role focused on designing and delivering enterprise-scale, distributed backend systems for real-time financial risk analytics. The position combines hands-on development with technical leadership, driving architecture, performance optimization, and DevOps practices. You will build scalable, low-latency solutions using modern Java technologies within a message-driven, containerized environment. 🗂️ Requirements: 8+ years experience in enterprise-scale distributed backend development, Expert knowledge of Java 11+, Hands-on experience with Spring ecosystem, Strong SQL skills and experience with Microsoft SQL Server, Experience with message-driven architectures, Experience with Kafka or similar messaging systems, Experience with CI/CD tools and practices, Proficiency with Git version control, Experience with Docker and Kubernetes or OpenShift, Proven experience leading technical initiatives and mentoring engineers 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SQL, MicrosoftSQLServer, Kafka, RabbitMQ, Redis, ApachePinot, Git, Jenkins, Tekton, Docker, Kubernetes, OpenShift, Unix, Linux, Shell 🏢 Description: The Opportunity: Shape the Future of Financial Risk Analysis Join our team at the forefront of financial technology, where we build and maintain the critical platform for Prime Services Risk and Business Intelligence. Our systems are the analytical engine that empowers the firm to manage risk, serve our clients, and make data-driven decisions in a complex, fast-paced market. We are a global team of innovators and problem-solvers who design and operate sophisticated, computing-intensive solutions to analyze the risk profiles of our clients. This is not just another development role; this is a chance to work on a platform that is fundamental to the firm's stability and success. You will tackle challenging problems in distributed systems, real-time data processing, and financial analytics at scale. We are looking for a passionate and experienced Lead Java Engineer to not only contribute to our codebase but also to drive technical direction, mentor our team, and own the delivery of robust, scalable solutions. Key Responsibilities: As a Lead Engineer, you will be at the heart of our technical decision-making and delivery process. Architect & Build: Design, develop, and own end-to-end software solutions using Java and the Spring ecosystem. You will be responsible for creating services that are not only functional but also resilient, performant, and scalable. Lead & Mentor: Act as a technical leader within the team. Guide architectural discussions, lead sub-teams on complex projects, and actively mentor junior engineers through constructive code reviews and knowledge-sharing sessions. Drive Performance: Engineer high-throughput, low-latency systems. You will optimize applications for maximum speed, design efficient data models in Microsoft SQL Server, and implement intelligent caching strategies (e.g., Redis) to ensure our platform operates at peak performance. Embrace Real-Time Data: Harness the power of our message-driven architecture using Kafka. You will build and maintain data pipelines that feed our real-time analytics engine, powered by Apache Pinot, to deliver instantaneous insights to our business users. Champion DevOps & Automation: Contribute to and enhance our CI/CD pipelines, leveraging internal platforms and Git for seamless integration and deployment. You will deploy and manage applications on our OpenShift container platform, embracing a true DevOps culture. Integrate & Collaborate: Work across teams to integrate with a wide array of upstream data sources and downstream consumers. You will collaborate closely with project managers, business analysts, and senior stakeholders to translate complex requirements into well-architected technical solutions. Own & Support: Take ownership of the full application lifecycle, including providing critical application support. You will leverage your growing knowledge of margin methodology and risk analytics to troubleshoot and resolve production issues effectively. Qualifications: Extensive Backend Experience: 8+ years of professional experience designing, building, and deploying enterprise-scale, distributed backend systems. Java Expertise: Deep, hands-on knowledge of modern Java (11+) and the Spring ecosystem (Spring Boot, Spring Security, etc.). Database Proficiency: Strong command of SQL and experience with relational databases, particularly Microsoft SQL Server. You should be adept at writing optimized queries and designing efficient schemas. Messaging & Asynchronous Systems: Proven experience working in message-driven architectures with technologies like Kafka, RabbitMQ, or similar. Leadership & Mentorship: A demonstrated track record of leading technical initiatives, making architectural decisions, and mentoring other engineers. Your experience should show that you are a force multiplier for your team. DevOps Mindset: Solid experience with CI/CD principles and tools (e.g., Jenkins, Tekton), and version control with Git. Experience with containerization and orchestration (Docker, Kubernetes, OpenShift) is essential. Strong Communication: Excellent verbal and written communication skills, with the ability to articulate complex technical concepts to both technical and non-technical audiences. Preferred Qualifications (The "Wow" Factor): Financial Domain Knowledge: Experience or a strong interest in the Finance Sector, especially concepts related to Prime Finance, Counterparty Risk, or Market Risk. Advanced Education: An advanced degree (M.S. or Ph.D.) in Computer Science, Engineering, Mathematics, or a related quantitative field. Real-Time Analytics Experience: Hands-on experience with OLAP datastores like Apache Pinot. Scripting & Automation: Proficiency in Unix/Linux environments and shell scripting. Agile Experience: Experience working in a fast-paced, Agile/Scrum environment, managing priorities, and delivering under tight deadlines. What We Offer: Impactful Work: The opportunity to work on a business-critical platform that has a direct and measurable impact on the firm's bottom line and risk posture. Technical Challenges: A continuous stream of complex and intellectually stimulating challenges in the realms of distributed computing, big data, and financial modeling. Modern Tech Stack: Access to a modern, evolving tech stack with the freedom to innovate and introduce new technologies and patterns. Career Growth: A commitment to your professional development with a clear path for growth into senior technical leadership or management roles. Collaborative Culture: A supportive and collaborative global team that values diversity of thought, continuous learning, and mutual respect. Competitive Compensation: A competitive salary, performance-based bonus, and a comprehensive benefits package - details below. By joining Citi Solutions Center Poland, you will not only be part of a business casual workplace with a hybrid working model (currently up to 2 days working at home per week), but also (potentially, subject to final offer) receive a competitive base salary and enjoy a whole host of additional benefits which can include: Employer paid Defined Contribution Pension Plan contribution of 6% of employee’s pensionable earnings (PPE Program) Employer paid Private Medical Care Package for employees and Private Medical Care Packages for certain family members available at preferential rates Employer paid Life Insurance Program for employees and Life Insurance for certain family members available at preferential rates Employee Assistance Program financed by Employer Paid Parental Leave Program (maternity and paternity leave; statutory and 2 weeks additional paid paternity leave) Sport Card for employees subsidized via Social Benefits Fund and Sport Cards for certain family members available at preferential rates Additional benefits from Company’s Social Benefit Fund, in particular: Holidays Allowance, support for sport and cultural activities, team building events. Additional day off for volunteering Cafeteria/ flex benefit – a company benefits system which enables employees to select and purchase benefits offered by a provider and available for employees on the platform. Opportunity to receive an annual discretionary incentive award Special offers and discounts for employees Copy and paste the URL below into a new tab on your web browser to view the Remuneration Regulations extract: https://tbcdn.talentbrew.com/company/287/cms/v3/docs/policies/RemunerationRegulations-KeyProvisions-CitibankEurope_plc_05012025_A.pdf Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self every day. We want the best talent around the world to be energized to join us, motivated to stay, and empowered to thrive. Sounds like Citi has everything you need? Then apply to discover the true extent of your capabilities. #LI-KK1 ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Applications Development ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Primary Location Full Time Salary Range: 268 390,00 zł - 457 010,00 zł ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above. ------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ Automated Processing and AI We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi. Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details. ------------------------------------------------------ This job opening is for an existing job vacancy. ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi . View Citi’s EEO Policy Statement and the Know Your Rights poster.

🏢 Summary: Development role focused on building and maintaining a modern microservices-based payment processing platform in a high-volume environment. The position involves designing, implementing, and supporting Java-based services, ensuring scalability, reliability, and performance. Work is done in a hybrid model with strong emphasis on quality, testing, and production support. 🗂️ Requirements: Minimum 3 years of experience in similar role, Strong Java development experience, Knowledge of Spring Boot, Understanding of microservices architecture, Understanding of distributed systems, Experience with API design, Experience with at least some of the listed technologies, Ability to perform unit testing and code reviews, Fluent English 📃 Skills: Java, Spring, SpringBoot, Microservices, Kubernetes, OpenShift, Kafka, RabbitMQ, MongoDB, Oracle, SQL, REST, Groovy, Maven, Jenkins, Jira, Confluence 🏢 Description: About the Project Our client is a European payments organization undergoing a major digital transformation focused on modernizing its core transaction‑processing platform. The team is building a modern microservices‑based environment designed to increase scalability, reliability, and performance across high‑volume payment operations. Technology stack in use: Java 21 (Spring Boot 3), OpenShift / Kubernetes, Apache Kafka / Rabbit MQ for streaming and queuing, MongoDB, Oracle Database, multiple DevOps tools for development, automation and monitoring. Work mode: hybrid, 3-4 per week from Cracow office Key Responsibilities: ·       Design, develop and support testing payment services features together with the team. ·       Resolve issues by troubleshooting and root cause analysis and support in production issue analysis when needed. ·       Ensure high quality via unit testing and code reviews. ·       Demo and document the results of work in demo sessions. Required Experience & Skills: ·       At least 3 years on similar position ·       Technical knowledge in at least some of the technologies used is needed. ·       Java development skills are the most relevant. ·       Understanding of microservices architecture and distributed systems. ·       Familiarity with API design principles. ·       Fluent English Additional Valuable Skills: ·       Experience in designing and implementing high-throughput, low-latency systems capable of handling large data volumes ·       Groovy, Maven, Jenkins ·       Knowledge of the Card Processing domain ·       Documentation and use of Jira/Confluence ·       Excellent communication and coordination skills We offer Ongoing support from a dedicated agent who is caring about your project continuity, contact with clients, necessary formalities, work comfort, and development. Career Development Program – advice on career planning based on the latest trends and market needs in IT, including consultations with career agents and mentors. Access to 7N Learning & Development – a development and educational platform offering webinars, a library of articles and industry reports, and frequent invitations to both one-time and recurring events focused on technical, business, and lifestyle topics. Spectacular events, both for you (e.g., annual Kick-Off trip , Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g. family picnics), Professional growth Professional growth beyond your current project. You can actively engage in knowledge sharing through the 7N Services offering, designed for 7N clients. Connections and access to the expertise of top IT professionals in the market – the average professional tenure of our consultants in Poland is over 10 years, A complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad