Senior Software Engineer (m/k)

🏢 Summary: Senior Backend Engineer role focused on designing and developing scalable, reliable backend services using Java. The position involves working in a cross-functional team to build high-performance systems, improve architecture, and support CI/CD and production environments. 🗂️ Requirements: 5+ years Backend Engineering experience, Strong Java proficiency, Solid knowledge of databases and SQL, Experience with RESTful APIs, Experience with microservices architecture, Experience with high-load systems, Experience with Docker and Kubernetes, Experience with AWS or GCP, Knowledge of CI/CD pipelines, Understanding of Agile practices 📃 Skills: Java, SQL, REST, Microservices, Docker, Kubernetes, AWS, GCP, CI/CD, Golang, Python 🏢 Description: We are looking for a Senior Backend Engineer with strong Java experience to help us design and develop scalable solutions. You will work in a cross-functional team, building reliable services and contributing to the continuous improvement of our systems. This role is ideal for someone who enjoys solving complex problems and driving technical excellence. 💼 Responsibilities: Design, develop, and maintain backend features and services. Collaborate with teams to define requirements and integrate systems. Ensure performance, scalability, and reliability of applications. Contribute to CI/CD processes and support production systems. Write clear documentation and share knowledge within the team. ✅ Requirements: 5+ years of experience as a Backend Engineer, with strong Java skills (Golang/Python is a plus). Solid understanding of databases and SQL. Experience with RESTful API design, microservices, and high-load systems. Familiarity with Docker, Kubernetes, and cloud environments (AWS/GCP). Knowledge of CI/CD pipelines and Agile practices. Strong problem-solving and communication skills. 🎁 We offer: Stable employment in a fast-growing company. Flexible and remote-friendly working model. Health and wellbeing benefits. Learning and development opportunities. Modern equipment and comfortable work environment.

🏢 Summary: Senior Backend Developer role focused on building and maintaining internal banking architecture tooling using Java and Node.js in a hybrid Krakow-based environment. The position involves developing backend services, APIs, web UI components, and AI-agent orchestration solutions to support enterprise-scale digital transformation. Candidates should have strong software engineering experience, database expertise, and knowledge of modern integration and automation practices. 🗂️ Requirements: 5+ years of software engineering experience, Strong expertise in Node.js, Strong expertise in Java, Experience with relational databases, Proficiency in PostgreSQL, Experience with JavaScript/TypeScript frameworks, Knowledge of agentic application engineering, Experience with MCP integration patterns, API design experience, Experience with tool/function calling, Production engineering mindset, Solution design skills, Fluent English, Legal right to work in the European Union 📃 Skills: Java, Node.js, PostgreSQL, JavaScript, TypeScript, MCP, API, SQL, AI, DevOps 🏢 Description: Empower innovative architecture tools — shape the future of banking technology! Krakow-based opportunity with hybrid work model (up to 3 remote days per week). As a Senior Backend Developer – Java and Node.js Platforms , you will be working for our client, a leading international bank. You’ll contribute to designing, building, and maintaining cutting-edge internal tooling that supports the bank’s Future State Architecture across CTO Platforms. Your work will enable seamless integration of data, workflows, and autonomous AI agents, helping redefine technology governance at scale and driving digital transformation. Your main responsibilities: Design, develop, and maintain reliable internal tooling supporting Future State Architecture (FSA) with a focus on security, resilience, and usability. Build backend services and APIs using Node.js and/or Java, integrating with PostgreSQL and other enterprise data sources. Develop web UI components utilizing modern JavaScript/TypeScript frameworks to deliver intuitive user workflows. Apply agentic engineering practices to orchestrate autonomous AI agents for building, testing, and deploying software. Implement secure, efficient integration patterns (e.g., MCP, API design, tool/function calling) across the architecture ecosystem. Collaborate with architects, platform engineers, and stakeholders to translate architectural needs into effective technical solutions. Ensure solutions adhere to client's engineering standards, including testing, performance, security, and operational readiness. Support continuous improvement initiatives through automation, code reviews, and operational support for live systems. You're ideal for this role if you have: At least 5 years of experience in software engineering, with strong expertise in Node.js and/or Java . Proficiency with relational databases , particularly PostgreSQL (data modeling, query optimization). Web UI development experience with modern JavaScript/TypeScript frameworks . Knowledge of agentic application engineering , including orchestration of autonomous AI agents. Experience with integration patterns such as MCP , API design , and tool/function calling . A production engineering mindset, emphasizing security, resilience, performance, and observability . Solution design skills for internal platforms and tooling. Excellent English communication skills and proven experience in stakeholder collaboration within a global environment. It is a strong plus if you have: Certifications or experience in automation, DevOps, or related fields. Additional familiarity with cloud services or enterprise architecture frameworks. Language Required for the role: Fluent English (spoken and written). Eligibility to work in: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Backend Engineer role focused on building and scaling JVM-based services for large-scale payment processing systems in a cloud-native, microservices architecture. The position involves integrating external payment providers, implementing event-driven workflows, and ensuring high performance and reliability of distributed services. This is a long-term remote project enhancing payment flows and compliant financial features. 🗂️ Requirements: 5+ years commercial backend development in JVM ecosystem, Experience integrating external payment platforms or financial APIs, GoCardless integration experience, Experience with cloud-based relational databases, Experience with container orchestration tools, Experience with messaging systems and asynchronous communication, Knowledge of direct debit or instant bank transfer mechanisms, Fluent English (spoken and written), Residence in Poland 📃 Skills: Java, JVM, GoCardless, SQL, Kubernetes, Docker, Messaging, Microservices, Cloud, APIs, Payments 🏢 Description: We are looking for a Senior Backend Engineer experienced in JVM technologies to join a remote product development team working on large‑scale payment processing solutions. The role involves contributing to a long‑term initiative aimed at enhancing payment flows and supporting key business requirements through modern, service‑oriented architecture. Your tasks Designing and developing backend services using JVM technologies in a cloud‑native environment Creating and maintaining integrations between internal systems and external payment providers Implementing event‑driven communication patterns and message‑based workflows Ensuring the scalability, performance, and reliability of distributed microservices Collaborating closely with product and architecture teams to deliver compliant payment features Participating in code reviews and contributing to the continuous improvement of engineering practices Requirements Minimum 5 years of commercial experience in backend development within the JVM ecosystem Hands‑on background in integrating external payment platforms or similar financial APIs GoCardless integration experience Familiarity with cloud‑based relational databases and container orchestration tools Experience with messaging systems and asynchronous communication patterns Knowledge of direct debit flows or instant bank transfer mechanisms will be a strong advantage Strong command of English, both spoken and written Residing in Poland required

🏢 Summary: Backend Developer role in a large-scale financial project focused on designing and developing complex Java-based backend systems. The position involves implementing new features, maintaining existing solutions, and contributing to system architecture and process optimization. The role offers active participation in the evolution and deployment of a critical financial platform. 🗂️ Requirements: Minimum 5 years of experience with Java, Experience in backend development, Higher education degree in Computer Science or related field, Good command of English for daily communication, Ability to analyze requirements and optimize system architecture 📃 Skills: Java, Backend, CI/CD, Testing, Frameworks, English 🏢 Description: Poszukujemy doświadczonego Backend Developera do dużego projektu dla klienta z branży finansowej. Rola daje możliwość pracy nad złożonymi rozwiązaniami backendowymi, poznania całego systemu i aktywnego uczestnictwa w jego rozwoju oraz wdrażaniu nowych funkcjonalności. Obowiązki Projektowanie i rozwój backendu w technologii Java . Implementacja nowych funkcjonalności i utrzymanie istniejących rozwiązań. Współpraca z zespołem developerskim oraz interesariuszami biznesowymi. Analiza wymagań i proponowanie optymalizacji procesów oraz architektury systemu. Wymagania Minimum 5 lata doświadczenia w pracy z Java (poziom Mid/Senior). Wykształcenie wyższe – kierunki informatyczne lub pokrewne. Dobra znajomość języka angielskiego – intensywny kontakt z zespołem i biznesem. Komunikatywność i umiejętność współpracy z osobami spoza działu IT. Zainteresowanie pracą przy dużym systemie finansowym i realnym wpływem na jego rozwój. Mile widziane Doświadczenie w projektach finansowych lub systemach przetwarzania danych historycznych. Znajomość narzędzi wspierających rozwój backendu, np. frameworków, CI/CD, testów automatycznych.

🏢 Summary: Senior Java Developer role focused on designing, developing, and maintaining backend services for an enterprise financial application. The position involves building REST and SOAP integrations, implementing business logic and data access layers, and ensuring high quality, scalability, and stability of solutions in an Agile environment. The role is fully remote within an enterprise setting. 🗂️ Requirements: Minimum 5–8 years commercial experience in Java, Very good knowledge of Java, Advanced knowledge of Spring Framework, Advanced knowledge of Spring Boot, Experience with Hibernate, Experience with JPA, Experience in designing and implementing REST API, Experience with SOAP services, Knowledge of Oracle Database, Knowledge of Oracle SQL, Experience in system integrations, Experience with data synchronization, Experience with service contract management and versioning, Experience with RabbitMQ, Experience with Maven, Experience working in Agile/Scrum, English level B2 minimum 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, SOAP, Oracle, SQL, RabbitMQ, Maven, Agile, Scrum 🏢 Description: Podsumowanie roli: Senior Java Developer będzie odpowiedzialny za rozwój, integrację oraz utrzymanie usług backendowych dla korporacyjnej aplikacji finansowej. Rola koncentruje się na projektowaniu i implementacji wysokiej jakości rozwiązań technologicznych, integracji systemowej oraz zapewnieniu stabilności i skalowalności usług w środowisku enterprise. Zakres obowiązków: Projektowanie, rozwój i integracja usług backendowych w technologii Java. Implementacja rozwiązań backendowych zgodnie z wymaganiami biznesowymi i technicznymi. Tworzenie oraz utrzymywanie API REST. Praca z usługami SOAP oraz integracjami systemowymi. Implementacja logiki biznesowej oraz warstwy dostępu do danych. Pisanie i utrzymywanie testów jednostkowych. Współpraca z analitykami, architektami oraz zespołem projektowym. Udział w pracach zespołu Agile/Scrum. Dbanie o jakość kodu, stabilność rozwiązań oraz zgodność z dobrymi praktykami developerskimi. Praca zdalna w środowisku enterprise. Wymagania: Bardzo dobra znajomość Java oraz minimum 5–8 lat doświadczenia komercyjnego . Zaawansowana znajomość Spring Framework / Spring Boot . Doświadczenie z Hibernate oraz JPA . Praktyczna znajomość projektowania i implementacji REST API . Doświadczenie w pracy z usługami SOAP . Znajomość Oracle Database oraz Oracle SQL . Doświadczenie w integracjach systemowych, w tym synchronizacji danych, pracy z kontraktami oraz wersjonowaniem usług. Praktyczne doświadczenie z RabbitMQ oraz Maven . Doświadczenie w pracy w metodykach Agile/Scrum . Język angielski na poziomie minimum B2 . Mile widziane: Doświadczenie w obszarze DevOps , w tym CI/CD, pipelines oraz współpraca z zespołami operacyjnymi. Znajomość PostgreSQL . Praktyczne doświadczenie w pracy w Scrum. Znajomość UML . Doświadczenie w analizie systemowej. Udział w decyzjach architektonicznych. Doświadczenie w projektach finansowych lub raportowych.

🏢 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: Senior Backend Developer role focused on designing, developing and scaling a modern web platform using Python and Django. The position involves architectural decisions, performance optimization, async processing and integrations with external systems. Strong ownership of code quality and technical direction is expected. 🗂️ Requirements: Minimum 5 years of backend development experience, Strong knowledge of Python, Commercial experience with Django, Experience with Django REST Framework, Practical experience with PostgreSQL, Experience with Docker and Docker Compose, Knowledge of asynchronous processing (Celery, Redis, queues), Ability to design and document REST APIs, Experience with system architecture and scalability, Experience with external API integrations 📃 Skills: Python, Django, DRF, PostgreSQL, Docker, Redis, Celery, REST, API, Angular, CQRS, DDD 🏢 Description: Szukamy doświadczonego Senior Backend Developera , który pomoże nam rozwijać i skalować nowoczesną platformę webową. Jeśli Backend to Twoje naturalne środowisko, a architektura, jakość kodu i odpowiedzialność techniczna są dla Ciebie ważniejsze niż „feature factory” – zapraszamy. Zakres obowiązków: Projektowanie i rozwój Backendu w Pythonie ( Django / Django REST Framework ) Współtworzenie architektury systemu (monolit + integracje, async, background tasks) Optymalizacja wydajności i skalowalności aplikacji Integracje z systemami zewnętrznymi (API, webhooki, płatności, usługi third-party) Dbanie o jakość kodu: code review, testy, dobre praktyki Współpraca z frontendem (Angular) i zespołem produktowym Realny wpływ na decyzje technologiczne Wymagania: Minimum 5 lat doświadczenia w Backendzie Bardzo dobra znajomość Pythona i Django Doświadczenie z Django REST Framework Praktyczna znajomość baz danych PostgreSQL Doświadczenie z Docker / Docker Compose Znajomość zagadnień async (Celery, Redis, kolejki) Umiejętność projektowania API i pracy z dokumentacją Samodzielność, odpowiedzialność i techniczne myślenie Mile widziane: Doświadczenie w projektowaniu większych systemów (DDD, CQRS, wzorce projektowe) Praca z systemami legacy i ich stopniową refaktoryzacją Doświadczenie w edukacji online / platformach SaaS Znajomość Angulara (na poziomie współpracy z FE) Oferujemy: Realny wpływ na produkt i architekturę Pracę przy sensownym, długoterminowym projekcie Dużą autonomię techniczną Elastyczne godziny pracy i pracę zdalną Współpracę B2B lub UoP Wynagrodzenie adekwatne do doświadczenia Jeśli lubisz backend, który ma znaczenie , a nie tylko „kolejne endpointy” - odezwij się. Etapy rekrutacji: 1. Zaproszenie na video screening 2. Zadanie rekrutacyjne sprawdzające znajomość DRF 3. Rozmowa miękko-techniczna -> po ok. 5 dniach od odesłania zadania, po pozytywnej jego ocenie umawiamy spotkanie online (ok. 40-min.) + krótki test kompetencji logicznych (online 40 minut)

🏢 Summary: Remote B2B opportunity for a Senior Backend Engineer to design and develop scalable microservices-based backend systems using Java and Spring Boot in a cloud environment. The role focuses on building REST APIs, integrating messaging systems, and ensuring high availability, security, and scalability of distributed systems. The project is expanding and requires experienced engineers to support its growing scale. 🗂️ Requirements: Minimum 5 years of experience in backend development with Java, Very good knowledge of Java 17 or newer (preferably Java 21), Practical experience with Spring Boot and Spring ecosystem (Spring Security, Spring Data, WebFlux or MVC), Experience in designing and developing distributed systems and microservices, Experience with asynchronous communication tools (Kafka or RabbitMQ), Very good knowledge of PostgreSQL and SQL, Experience in designing and integrating REST APIs, Practical knowledge of AWS or GCP cloud environments, Experience with Docker and Kubernetes, Knowledge of application security, including data encryption, token handling, and PCI-DSS basics, Communicative English level 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SpringData, WebFlux, MVC, Kafka, RabbitMQ, PostgreSQL, SQL, REST, AWS, GCP, Docker, Kubernetes, Microservices, PCI-DSS 🏢 Description: Dla naszego klienta z branży logistycznej poszukujemy dwóch doświadczonych Senior Backend Engineerów, którzy dołączą do zespołu rozwijającego nowoczesne rozwiązania backendowe w środowisku opartym o architekturę mikroserwisową oraz technologie chmurowe.Rekrutacja wynika z rozwoju projektu i potrzeby zwiększenia jego skali. Lokalizacja: praca zdalna oraz raz na kwartał spotkanie w Krakowie Forma współpracy: B2B Stawka: do 170 PLN/h Język angielski: minimum poziom komunikatywny Zakres obowiązków Projektowanie, rozwój i utrzymanie aplikacji backendowych opartych o Javę i Spring Boot Tworzenie oraz rozwijanie architektury mikroserwisowej Projektowanie i implementacja interfejsów REST API Integracja systemów z wykorzystaniem brokerów wiadomości Współpraca przy projektowaniu rozwiązań zapewniających wysoką dostępność i skalowalność systemów Udział w procesach związanych z bezpieczeństwem aplikacji oraz ochroną danych Współpraca z zespołami produktowymi, architektami oraz innymi zespołami technologicznymi Wymagania Minimum 5 lat doświadczenia zawodowego w tworzeniu aplikacji backendowych w języku Java Bardzo dobra znajomość Java 17 lub nowszej wersji (preferowana Java 21) Praktyczne doświadczenie z frameworkiem Spring Boot oraz komponentami ekosystemu Spring (Spring Security, Spring Data, WebFlux lub MVC) Doświadczenie w projektowaniu i rozwijaniu systemów rozproszonych oraz mikroserwisów Znajomość narzędzi do komunikacji asynchronicznej, takich jak Kafka lub RabbitMQ Bardzo dobra znajomość PostgreSQL oraz języka SQL Doświadczenie w projektowaniu i integracji REST API Praktyczna znajomość środowisk chmurowych AWS lub GCP Doświadczenie w pracy z Dockerem oraz Kubernetesem Znajomość zagadnień związanych z bezpieczeństwem aplikacji, w tym szyfrowaniem danych, obsługą tokenów oraz podstawowych wymagań PCI-DSS Komunikatywna znajomość języka angielskiego Mile widziane Doświadczenie zdobyte w branży fintech, płatności lub e-commerce Znajomość standardów PCI-DSS, PSD2 lub ISO 8583 Doświadczenie w pracy z rozwiązaniami opartymi o modele językowe (OpenAI, Anthropic lub podobne) Znajomość zagadnień związanych z RAG, Prompt Engineering, Tool Use lub innymi wzorcami Agentic AI Doświadczenie w integracji systemów płatniczych, widgetów lub SDK

🏢 Summary: Senior Backend Engineer role focused on building and scaling backend systems for an AI-driven product that transforms complex government data into actionable insights. The position involves designing data ingestion, processing pipelines, and distributed infrastructure from scratch, with full ownership from architecture to production. You will work closely with a small senior team to deliver scalable, production-ready systems. 🗂️ Requirements: 6+ years of Backend Engineering experience, Experience in JVM ecosystem, Experience in product companies (B2B SaaS preferred), Experience designing and owning backend systems in production, Strong knowledge of system design and scalability, Experience building asynchronous or distributed systems, Ability to make and justify technical decisions, Fluency in English, Valid work authorization in Europe or LATAM 📃 Skills: Kotlin, Java, JVM, SQL, GCP, Messaging, Queues, DistributedSystems, SystemDesign, DataPipelines, LLMs, AI 🏢 Description: About the role We’re looking for a Senior Backend Engineer to join our early team and help build our product from zero to one. You’ll work on a product that helps companies navigate complex government data, from contracts and grants to market signals and turn it into actionable insights using AI. On the backend side, this means working on data ingestion, processing, and the infrastructure that powers search and AI-driven workflows at scale. You’ll collaborate closely with a small, senior team and have real ownership, from shaping solutions to shipping them to production and improving them over time. You might be a fit if you: Must have: 6+ years of experience as a Backend Engineer, preferably in the JVM ecosystem (we use Kotlin on the backend) Experience working in product companies (B2B SaaS preferred) with direct impact on shipped features Experience working in small companies or startups would be a strong advantage Experience designing and owning backend systems in production (from initial design to deployment and ongoing improvements) Strong understanding of system design, including scalability, failure handling, and trade-offs Experience building asynchronous or distributed systems (e.g. messaging, queues, event-driven systems) Ability to make and justify technical decisions, not just implement given solutions Fluency in written and spoken English Nice to have: Experience with large-scale data processing, scraping, or data pipelines Experience working with LLMs / AI-related systems Experience with GCP or similar cloud environments How We Work Build Bridges to Help Customers Win - We pride ourselves on being obsessively customer-centric. Shooting Star Speed - We move with extreme speed. We value momentum, decisiveness, and the ability to accelerate when it matters. Fun Is a Feature - Fun is a Feature means we intentionally design Starbridge to be an energizing place to do hard work. Joy, humor, and camaraderie make great teams faster, sharper, and more resilient. In the Arena - We believe the best ideas come from living close to the work, feeling the friction, hearing the nuance, and experiencing the details firsthand. Benefits include: Competitive salary + early-stage equity Unlimited PTO Regular off-sites (NYC + global locations) Interview Process We move fast — really fast. Getting back to someone today beats tomorrow, and our interview process reflects that mindset. Please keep us posted on your timeline so we can move quickly and speed things up where needed. After submitting your application, the team reviews your CV and statement of exceptional work. If your application passes this stage, you will be invited to a 30-minute interview during which a member of our team will make sure you're a good fit for the role. You will have the opportunity ask questions and learn more about the role as well. We'll then send you a programming challenge that consists of two parts: LeetCode and SQL. Beyond that step, you will enter the main process, which consists of three interviews: System design exercise hands-on. Live coding in Java/Kotlin. Product thinking and past work. All interviews will be conducted via Google Meet. Eligibility to Work in Europe or LATAM: Candidates must hold valid authorization to work in the country where they will be based. At this time, we are unable to offer visa sponsorship or assist with work permit applications.

🏢 Summary: Senior Java Developer role focused on designing and building high-performance, scalable backend systems in a distributed microservices environment for the financial sector. The position involves developing REST APIs, processing large data volumes, and contributing to architecture and CI/CD in cloud-based environments. The role requires strong expertise in Java, Spring, distributed systems, and Kubernetes. 🗂️ Requirements: Minimum 10 years of software development experience, Very good knowledge of Java and Spring, Strong understanding of REST APIs, HTTPS, microservices, and message queues, Ability to design high-availability, scalable, high-performance systems, Very good knowledge of relational databases and SQL, Knowledge of distributed systems and data processing, Hands-on experience with Kubernetes and cloud platforms (GCP preferred), Familiarity with CI/CD pipelines, Experience working in Agile methodologies, Fluent Polish and English, Residence in Poland 📃 Skills: Java, Spring, REST, HTTPS, Microservices, MQ, SQL, Kubernetes, GCP, CI/CD, Agile, DistributedSystems, DataProcessing 🏢 Description: We are looking for an experienced Senior Java Developer to join a team responsible for building and developing modern backend systems in a distributed environment. The projects involve high-performance and scalable solutions used in the financial sector, with a focus on processing large volumes of data and microservices architecture. Your tasks Designing and developing backend systems based on Java Creating and evolving a microservices architecture Building and maintaining REST APIs and system integrations Designing solutions that meet high availability and performance requirements Working with systems that process large volumes of data Collaborating with the team using Agile methodologies Participating in architecture design and technical decision-making Implementing and optimizing CI/CD processes and ensuring system security Requirements Minimum 10 years in software development Very good knowledge of Java (backend) and Spring Strong understanding of REST APIs, HTTPS, microservices, and message queues (MQ) Ability to design high-availability, scalable, and high-performance systems Very good knowledge of relational databases (SQL) Familiarity with CI/CD pipelines and Agile ways of working Knowledge of distributed systems and data processing Hands-on work with Kubernetes and cloud platforms (GCP preferred) Fluent Polish and English required Residing in Poland required Nice-to-have requirements Knowledge of Go, Rust, or similar system-level languages Experience with NoSQL and analytical databases, e.g., ClickHouse Frontend development experience Familiarity with the banking sector (trade lifecycle, FX, post-trade processing) Banking experience / FX experience (forex) Working from the office in Krakow 6 times per month What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!