Backend Engineer

🏢 Summary: Backend Engineer role focused on designing and building scalable, secure, and high-performance backend systems for financial products. The position involves greenfield development, building REST APIs and microservices, and evolving critical systems such as payments, treasury, and crypto liquidity. The role emphasizes clean code, maintainability, and modern engineering practices in a fast-paced fintech environment. 🗂️ Requirements: 5+ years Backend development experience, Fluency in Java, Experience building REST APIs, Experience with microservices architecture, Experience with relational databases, Experience with Spring Boot, Experience with TDD, Experience with CI/CD pipelines, Bachelor’s degree in Computer Science, Mathematics, Physics or related field, Proven experience building complex, high-scale products 📃 Skills: Java, Spring, SpringBoot, PostgreSQL, REST, Microservices, TDD, DDD, CI, CD, SQL 🏢 Description: Our Mission We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What we're looking for As a Backend Engineer, you’ll design, develop, and maintain scalable, secure, and high-performing backend systems that power our innovative products. You’ll collaborate with a talented team to create solutions that drive financial inclusion and transform the way people manage their money. It is a hybrid role, so we expect our teammates to go to our Krakow office 2-3 times per week. What you'll be doing The work will focus on greenfield development and improvement of existing systems Projects will include building REST APIs, engineering microservices and evolving a number of systems that our business depends on (e.g. card payments, treasury management, transactions booking, crypto liquidity) Our technology stack is based predominantly on Java 25 on the backend with Postgres database We rely on Spring Boot for quick and quality delivery We have a pragmatic approach to develop our business logic, focusing on clean code, with emphasis on maintainability and fast turnaround with TDD, DDD and continuous integration & delivery What you'll need 3+ years of experience in Backend development, with fluency in Java Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or other Engineering / Science disciplines Quick learner with an ambitious and results driven personality, with excellent communication skills (english fluency, verbal and written) Track record of building complex products that millions of people use in hypergrowth startups. Perks: Competitive salary Own the development process that will face on the customer's impact Latest technology to work with Strong team that will help you improve your skills

🏢 Summary: Backend Engineer role focused on designing and building scalable, secure, high-performance backend systems for financial products, including payments, treasury, and crypto liquidity. The position involves greenfield development, microservices architecture, and REST API design using a modern Java-based stack. Emphasis is placed on clean code, TDD, DDD, and continuous integration and delivery. 🗂️ Requirements: 5+ years of backend development experience, Strong proficiency in Java, Experience building REST APIs, Experience designing microservices architectures, Experience with PostgreSQL or relational databases, Experience with Spring Boot, Experience with TDD and DDD methodologies, Experience with CI/CD practices, Bachelor’s degree in Computer Science, Mathematics, Physics or related field, Fluent English communication skills 📃 Skills: Java, Spring, SpringBoot, PostgreSQL, REST, Microservices, TDD, DDD, CI, CD, SQL 🏢 Description: Our Mission We are building the financial system for the next century. One where control sits in the hands of customers — not banks. Where money moves on rails that are faster, smarter, and radically more efficient. Where wealth management tools help you grow your savings for decades — and build generational wealth. Where fewer intermediaries mean more value stays where it belongs: in our customers’ pockets. We operate with long-term ambition and absolute conviction. We are not here to iterate on the past — we are here to redesign it. This is a defining moment to join us. We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What we're looking for As a Backend Engineer, you’ll design, develop, and maintain scalable, secure, and high-performing backend systems that power our innovative products. You’ll collaborate with a talented team to create solutions that drive financial inclusion and transform the way people manage their money. It is a hybrid role, so we expect our teammates to go to our Krakow office 2-3 times per week. What you'll be doing The work will focus on greenfield development and improvement of existing systems Projects will include building REST APIs, engineering microservices and evolving a number of systems that our business depends on (e.g. card payments, treasury management, transactions booking, crypto liquidity) Our technology stack is based predominantly on Java 25 on the backend with Postgres database We rely on Spring Boot for quick and quality delivery We have a pragmatic approach to develop our business logic, focusing on clean code, with emphasis on maintainability and fast turnaround with TDD, DDD and continuous integration & delivery What you'll need 5+ years of experience in Backend development, with fluency in Java Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or other Engineering / Science disciplines Quick learner with an ambitious and results driven personality, with excellent communication skills (english fluency, verbal and written) Track record of building complex products that millions of people use in hypergrowth startups.

🏢 Summary: Senior Android Engineer role focused on building and scaling a high-performance fintech mobile application, contributing to architecture, code quality, and end-to-end feature delivery. The position involves developing modern Android solutions and collaborating cross-functionally to deliver secure, user-centric financial products. The engineer will help evolve the Android app using best practices and modern frameworks. 🗂️ Requirements: 5+ years of experience building Android applications, Strong knowledge of Kotlin and Android ecosystem, Experience with Jetpack, Coroutines, and Compose, Understanding of MVVM, MVI, and Clean Architecture, Experience with Android testing frameworks, Ability to design and scale Android app architecture, Experience collaborating with cross-functional teams, Experience in fast-paced environments, Experience in fintech or consumer tech startups 📃 Skills: Kotlin, Android, Jetpack, Coroutines, Compose, MVVM, MVI, CleanArchitecture, Testing, Git 🏢 Description: Our Mission We are building the financial system for the next century. One where control sits in the hands of customers — not banks. Where money moves on rails that are faster, smarter, and radically more efficient. Where wealth management tools help you grow your savings for decades — and build generational wealth. Where fewer intermediaries mean more value stays where it belongs: in our customers’ pockets. We operate with long-term ambition and absolute conviction. We are not here to iterate on the past — we are here to redesign it. This is a defining moment to join us. We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What We’re Looking For We’re looking for a Senior Android Engineer who’s passionate about building beautiful, reliable, and high-performance products that delight users. You’ll be a hands-on engineer, contributing high-quality code and helping raise the bar for engineering standards across the team. You’ll join our Core Product Team, helping to build and scale the ARQ experience — from our flagship Android app to new product lines like Premium, Credit, and other financial products on the roadmap. What You’ll Be Doing Design and build exceptional Android experiences that users love and trust. Write clean, maintainable, and performant Kotlin code using modern Android tools and frameworks. Collaborate closely with Product, Design, and Backend teams to deliver features end-to-end. Contribute to the architecture and evolution of the Android app as it scales. Own features from concept to launch, ensuring quality, polish, and performance. Help improve code quality, testing, and development best practices within the team. What You’ll Need 5+ years of experience building Android applications used by thousands or millions of users. Strong knowledge of Kotlin and the Android ecosystem (Jetpack, Coroutines, Compose, etc.). Solid understanding of architecture patterns (MVVM, MVI, Clean Architecture) and testing frameworks. Strong ownership mindset and attention to detail when building user-facing products. Appreciation for great UX and product quality. Experience working in fast-paced environments, ideally in fintech or consumer tech startups.

🏢 Summary: Senior Android Engineer role focused on building and scaling high-performance, user-centric financial products within a core product team. The position involves designing, developing, and evolving a flagship Android app and new fintech features using modern Android technologies. You will own features end-to-end and contribute to architecture, code quality, and engineering standards. 🗂️ Requirements: 5+ years of experience building Android applications at scale, Strong proficiency in Kotlin, Deep knowledge of Android ecosystem components, Experience with Jetpack, Coroutines, and Compose, Understanding of MVVM, MVI, and Clean Architecture, Experience with testing frameworks for Android, Ability to design scalable mobile app architecture, Experience collaborating with backend and product teams 📃 Skills: Kotlin, Android, Jetpack, Coroutines, Compose, MVVM, MVI, CleanArchitecture, Testing, Git 🏢 Description: Our Mission We are building the financial system for the next century. One where control sits in the hands of customers — not banks. Where money moves on rails that are faster, smarter, and radically more efficient. Where wealth management tools help you grow your savings for decades — and build generational wealth. Where fewer intermediaries mean more value stays where it belongs: in our customers’ pockets. We operate with long-term ambition and absolute conviction. We are not here to iterate on the past — we are here to redesign it. This is a defining moment to join us. We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What We’re Looking For We’re looking for a Senior Android Engineer who’s passionate about building beautiful, reliable, and high-performance products that delight users. You’ll be a hands-on engineer, contributing high-quality code and helping raise the bar for engineering standards across the team. You’ll join our Core Product Team, helping to build and scale the ARQ experience — from our flagship Android app to new product lines like Premium, Credit, and other financial products on the roadmap. What You’ll Be Doing Design and build exceptional Android experiences that users love and trust. Write clean, maintainable, and performant Kotlin code using modern Android tools and frameworks. Collaborate closely with Product, Design, and Backend teams to deliver features end-to-end. Contribute to the architecture and evolution of the Android app as it scales. Own features from concept to launch, ensuring quality, polish, and performance. Help improve code quality, testing, and development best practices within the team. What You’ll Need 5+ years of experience building Android applications used by thousands or millions of users. Strong knowledge of Kotlin and the Android ecosystem (Jetpack, Coroutines, Compose, etc.). Solid understanding of architecture patterns (MVVM, MVI, Clean Architecture) and testing frameworks. Strong ownership mindset and attention to detail when building user-facing products. Appreciation for great UX and product quality. Experience working in fast-paced environments, ideally in fintech or consumer tech startups.

🏢 Summary: Lead iOS Software Engineer role focused on building and scaling a high-quality fintech mobile app, driving architecture, code excellence, and delivering secure, performant user experiences. The position involves hands-on development, technical leadership, and ownership of features across multiple financial products. 🗂️ Requirements: 6+ years of professional iOS development experience, Strong proficiency in Swift, Experience with UIKit, SwiftUI, and Combine, Knowledge of MVVM and Clean Architecture, Experience with testing practices in iOS, Experience building complex, high-scale consumer applications, Ability to design scalable and secure mobile architectures, Experience with full feature lifecycle from design to deployment 📃 Skills: Swift, iOS, UIKit, SwiftUI, Combine, MVVM, CleanArchitecture, Xcode, Git, Testing, CI/CD 🏢 Description: Our Mission We are building the financial system for the next century. One where control sits in the hands of customers — not banks. Where money moves on rails that are faster, smarter, and radically more efficient. Where wealth management tools help you grow your savings for decades — and build generational wealth. Where fewer intermediaries mean more value stays where it belongs: in our customers’ pockets. We operate with long-term ambition and absolute conviction. We are not here to iterate on the past — we are here to redesign it. This is a defining moment to join us. We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What We’re Looking For We’re looking for a Lead iOS Software Engineer who is a world-class hands-on builder. You’ll set the bar for engineering excellence, lead by example through code reviews and architecture design, and inspire a growing mobile team to deliver elegant, reliable, and beautiful experiences that define what financial products should feel like. This is a high-impact role on our Core Product Team , where you’ll help build and scale the ARQ experience - from our flagship app to new initiatives such as Premium , Credit , and other innovative financial products in the pipeline. What You’ll Be Doing Be the hands-on technical expert for all things iOS - writing world-class code, performing code reviews, and ensuring technical excellence across the app. Collaborate with Product and Design to craft pixel-perfect user experiences with exceptional attention to detail, performance, and reliability. Architect, build, and maintain scalable mobile features that are secure, fast, and delightful to use. Review code, share insights, and elevate the quality of engineering across the app. Drive the evolution of our mobile architecture to support a multi-product environment (Premium, Credit, and more). Collaborate closely with cross-functional teams to ship quickly while maintaining uncompromising quality. Own the full lifecycle of your features - from design and implementation to testing and deployment. What You’ll Need 6+ years of professional experience in iOS development, ideally building complex, high-scale consumer products. Proven expertise in Swift and Apple’s iOS ecosystem (UIKit, SwiftUI, Combine, etc.). Strong understanding of design patterns, architecture (MVVM, Clean Architecture), and testing practices. Deep passion for UI/UX craftsmanship - you care deeply about the small details that make products amazing. Proven ability to deliver outstanding products end-to-end in fast-moving, high-growth environments. Bonus: Experience in fintech , payments , or digital banking .

🏢 Summary: Lead iOS Software Engineer role focused on building and scaling a high-quality fintech mobile application. The position involves hands-on iOS development, architectural leadership, and delivering secure, performant, and pixel-perfect user experiences across multiple financial products. You will own features end-to-end and drive engineering excellence within the mobile team. 🗂️ Requirements: 6+ years of professional iOS development experience, Proven expertise in Swift, Strong knowledge of UIKit, SwiftUI, Combine, Experience with MVVM and Clean Architecture, Experience with testing practices in iOS, Ability to design scalable mobile architectures, Experience building complex, high-scale consumer applications 📃 Skills: Swift, iOS, UIKit, SwiftUI, Combine, MVVM, CleanArchitecture, Xcode, CI/CD, Git, Testing, REST 🏢 Description: Our Mission We are building the financial system for the next century. One where control sits in the hands of customers — not banks. Where money moves on rails that are faster, smarter, and radically more efficient. Where wealth management tools help you grow your savings for decades — and build generational wealth. Where fewer intermediaries mean more value stays where it belongs: in our customers’ pockets. We operate with long-term ambition and absolute conviction. We are not here to iterate on the past — we are here to redesign it. This is a defining moment to join us. We are building what we believe will become one of the most important financial institutions in the world. That requires exceptional talent, relentless standards, and people who care deeply about the work. At ARQ, we are turning the financial system upside down — starting in the Americas. We are nimble, but ambitious. We move fast, learn fast, and innovate relentlessly. Technology is our greatest ally, and execution is our edge. We build as a team. We think long term. We aim for world-class in everything we do. If you are exceptional at what you do — and ready to help redefine finance — we’d love to meet you. Are you ready to build what comes next? About the team We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies like Revolut, Uber, Amazon, Block and UBS: we owned some of the most loved and profitable products, delivered top-notch transaction processing platforms, created beautiful mobile applications - and helped them become profitable companies that changed the lives of millions of people. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors like Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator and Kaszek Ventures. What We’re Looking For We’re looking for a Lead iOS Software Engineer who is a world-class hands-on builder. You’ll set the bar for engineering excellence, lead by example through code reviews and architecture design, and inspire a growing mobile team to deliver elegant, reliable, and beautiful experiences that define what financial products should feel like. This is a high-impact role on our Core Product Team , where you’ll help build and scale the ARQ experience - from our flagship app to new initiatives such as Premium , Credit , and other innovative financial products in the pipeline. What You’ll Be Doing Be the hands-on technical expert for all things iOS - writing world-class code, performing code reviews, and ensuring technical excellence across the app. Collaborate with Product and Design to craft pixel-perfect user experiences with exceptional attention to detail, performance, and reliability. Architect, build, and maintain scalable mobile features that are secure, fast, and delightful to use. Review code, share insights, and elevate the quality of engineering across the app. Drive the evolution of our mobile architecture to support a multi-product environment (Premium, Credit, and more). Collaborate closely with cross-functional teams to ship quickly while maintaining uncompromising quality. Own the full lifecycle of your features - from design and implementation to testing and deployment. What You’ll Need 6+ years of professional experience in iOS development, ideally building complex, high-scale consumer products. Proven expertise in Swift and Apple’s iOS ecosystem (UIKit, SwiftUI, Combine, etc.). Strong understanding of design patterns, architecture (MVVM, Clean Architecture), and testing practices. Deep passion for UI/UX craftsmanship - you care deeply about the small details that make products amazing. Proven ability to deliver outstanding products end-to-end in fast-moving, high-growth environments. Bonus: Experience in fintech , payments , or digital banking .

🏢 Summary: Mid-level Backend Engineer role focused on building a cutting-edge FinTech platform for interbank intraday lending using Scala in an agile startup environment. The position involves delivering scalable, testable solutions through functional programming and TDD practices. The engineer will collaborate closely with the product team to incrementally develop and enhance the platform. 🗂️ Requirements: 3+ years of software development experience, Proficiency in Scala or similar language (e.g., Haskell), Understanding of reactive programming paradigms, Understanding of functional programming paradigms, Experience working in Agile environment, Experience working within Scrum framework, Ability to write testable, deployable and scalable code 📃 Skills: Scala, Haskell, Reactive, Functional, TDD, Scrum, Agile, Blockchain, DLT 🏢 Description: Are you a passionate backend engineer ready to take your skills to the next level? Join our Product Team as we build a cutting-edge FinTech platform for interbank intraday lending. This is your chance to be part of a dynamic, VC-backed startup and play a key role in shaping both our product and our company. Why Join Us? Fast-Paced Startup : Collaborate with a smart, agile team led by our hands-on technical co-founder. Your contributions will have a direct impact on our growth. Remote-First with a Weekly Anchor: Work remotely four days a week, and meet up with the team once a week at our Wrocław office to sync, collaborate in person, and keep the momentum going. Ownership : Receive equity options and be a true stakeholder in our success. Flexibility : Take advantage of a holiday schedule that isn’t tied to any specific country. Inspiring Team Off-Sites : Twice a year, we bring the entire team together for week-long off-sites in exciting locations (think Budapest, Bordeaux, Malta, and beyond). Modern AI-Augmented Workflow: We use Claude Code daily and invest in tooling that lets our engineers focus on the interesting problems. What You’ll Do Collaborate with our team to deliver incremental value through agile, systematic development cycles. Write clean, reusable, and efficient functional code using Scala , following TDD and engaging in pair-programming as needed. Ensure our solutions are testable, deployable , and scalable . Who You Are We’re looking for a proactive, mid-level backend engineer with: 3+ years of software development experience . Proficiency in Scala , or similar languages (e.g., Haskell ). A solid understanding of reactive and/or functional programming paradigms . Knowledge of Agile principles and experience working within the Scrum framework . (Nice-to-have) Experience using AI coding assistants effectively in a professional setting — knowing how to prompt well, scope tasks, and review AI-generated code critically. (Nice-to-have) An interest in or experience with blockchain/DLT technologies . (Bonus) A degree in Computer Science or a related field. About Us We are a forward-thinking FinTech startup backed by leading venture capital. Our mission is to revolutionize interbank lending through innovative technology. Agile principles guide our work, and we are committed to fostering a supportive, growth-oriented culture. If you’re excited about solving complex challenges, making an impact, and working in an environment that values both technical excellence and collaboration, we want to hear from you! Ready to Join? Apply now and start shaping the future of finance with us.

🏢 Summary: Backend Tech Lead role focused on leading and implementing a strategic rewrite of a core financial platform module into a modern, scalable architecture. The position combines hands-on Java/Spring Boot development with architectural decision-making, API design, and integration across multiple enterprise banking systems. It involves designing high-performance backend services handling large transactional and reporting datasets. 🗂️ Requirements: 7+ years backend or fullstack development experience, Strong Java expertise, Strong Spring Boot expertise, Experience designing REST APIs, Experience as Tech Lead or technical owner, Experience designing scalable and distributed systems, Strong relational database design skills (PostgreSQL), Experience with Elasticsearch or similar search technology, Experience integrating external systems via REST or GraphQL, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Knowledge of OAuth2 and OIDC, Working knowledge of React, Working knowledge of TypeScript, Experience handling large datasets with complex queries, Ability to lead architecture and mentor developers 📃 Skills: Java, Spring, SpringBoot, REST, GraphQL, PostgreSQL, Elasticsearch, Docker, Kubernetes, CI/CD, OAuth2, OIDC, React, TypeScript, SQL, Microservices, DistributedSystems 🏢 Description: Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems . We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development , helping redesign a legacy component into a modern, scalable architecture. You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems. IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰 170 - 190 PLN/h + VAT ☑️ B2B contract Your Daily Missions Lead the design and development of backend services for a core platform rewrite. Design scalable services responsible for transactions, balances, statements, and reporting data . Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems. Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination . Support frontend teams by ensuring API-first design and smooth integration with React applications . Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers . Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems . The Essentials We're Seeking 7+ years of experience in backend or fullstack software development. Strong expertise in Java and Spring Boot , including designing modular backend services and REST APIs. Experience acting as a Tech Lead or technical owner responsible for architectural decisions. Solid experience designing scalable APIs and distributed systems . Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns. Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets. Experience designing hybrid data architectures combining multiple data sources . Experience working with external system integrations , including REST or GraphQL APIs. Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines. Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows). Working knowledge of React and TypeScript , enabling effective collaboration with frontend teams. Proven ability to break down complex architectural changes into manageable development phases . Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows . Ability to combine hands-on engineering with technical leadership and mentoring . Nice-to-Haves Experience in FinTech, banking, or enterprise integration platforms . Experience with large-scale transactional or reporting systems . Experience with GraphQL integrations . Experience with data migration or legacy system modernization . Experience designing API-first platforms . Familiarity with observability practices (logging, metrics, tracing). Understanding of database partitioning and query optimization patterns . Reasons Why You Would Enjoy Working With Us We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed. We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates. We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together. You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters. You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am. You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK. We have a flat structure - we are not a corporation and don't want to be one 🙃. We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN). We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/ .

🏢 Summary: Senior Java Backend Engineer role focused on developing and maintaining Java applications for a global financial compliance solution, including AML and KYC systems. The position involves working in an agile, international team to design, integrate, and enhance cloud-based backend systems. Hybrid work model with on-site presence in Krakow required. 🗂️ Requirements: 5+ years of experience in Java development, Experience with Spring framework, Strong SQL skills, Experience with Oracle databases, Experience with MongoDB, Experience working in Linux environments, Bash scripting skills, Understanding of SDLC, Experience with CI processes, Ability to work on-site in Krakow 3 days per week, English proficiency B2 or higher 📃 Skills: Java, Spring, SQL, Oracle, MongoDB, Linux, Bash, Azure, Databricks, Git, GitLab, Nexus, Ansible, RPM, Denodo 🏢 Description: Join us as a Senior Java Backend Engineer . Experience with Azure Cloud and Databricks will be highly beneficial. Your primary responsibilities will include developing and maintaining Java-based applications for a global financial compliance solution. You will work in a highly collaborative, agile environment, partnering with colleagues from diverse backgrounds to design and integrate Anti-Money Laundering (AML) and Know Your Client (KYC) solutions that help protect our client from financial crime risks. The client operates in the financial services domain, focusing on regulatory compliance and risk management. Ready to launch your career in cloud engineering? Apply now and join our global team! This role offers a hybrid model, with 3 days per week working from the client's office in Krakow, Poland. Responsibilities Develop and maintain Java-based applications Drive continuous integration and improvements Contribute to architecture, standards, and guidelines for globally deployed software Support product management in driving the product roadmap Collaborate closely with the team to deliver robust, sustainable solutions aligned with business requirements and organizational standards Advise Business Analysts, Testers, and Management on technical matters Requirements 5+ years of experience developing Java applications (Spring framework is a plus) Solid SQL database skills (Oracle preferred; MongoDB experience is a plus) Comfortable working in a Linux server environment, including bash scripting Good understanding of application development and support lifecycle (SDLC) Well-developed business communication skills (written and verbal) Experience working as part of a global team Strong personal prioritization and time management skills Strong analytical, problem-solving, and synthesizing abilities Ability to communicate effectively in both written and spoken English (B2 level or higher) Ability to work 3 days per week in the Krakow office Nice to have Familiarity with MS Azure Cloud platforms, Databricks, Denodo Experience with DevOps tools (Git, GitLab Pipelines, Nexus, Ansible, RPM packaging) We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview We will reach out to selected candidates exclusively EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Backend Engineer role focused on building and modernising a global payments platform using Java and microservices architecture. The position involves developing reliable backend services and creating robust test automation frameworks to ensure high-quality, scalable payment processing. The role supports migration from legacy systems to API-driven, microservices-based solutions in an Agile/DevOps environment. 🗂️ Requirements: Strong experience with Java 11+, Hands-on experience in software testing and automation frameworks, Understanding of REST APIs, Knowledge of microservices architecture, Experience with Git, Experience with Unix/Linux environments, Experience with SQL databases, Experience with Spring and Spring Boot 📃 Skills: Java, Spring, SpringBoot, SQL, Oracle, Git, Unix, Linux, REST, Microservices, Automation, Testing 🏢 Description: Build the platform that moves money around the world We’re looking for a Backend Engineer with strong Java and test automation experience to join the team behind a global payments platform that enables businesses and customers to move money quickly, securely, and globally . The platform powers international payments that help organisations pay suppliers, process salaries, transfer funds, and pay taxes directly to authorities through multiple channels. You’ll play a key role in modernising payment systems , building high-quality microservices , and developing automation frameworks that ensure reliability at scale . As part of the engineering team, you’ll help design and build reliable payment services used globally. You will: Develop and maintain backend services and microservices in Java (11/17/21) Design and implement robust test automation frameworks to ensure high-quality software delivery Support the modernisation of legacy systems , migrating towards API and microservices-based architecture Improve system efficiency by increasing Straight-Through Processing (STP) capabilities Collaborate closely with engineers, testers, and stakeholders in an Agile/DevOps environment Contribute to scalable, resilient solutions powering global payment flows Must-have experience Strong development experience with Java 11+ (Java 17+ preferred) Hands-on experience in software testing and building automation frameworks Solid understanding of RESTful APIs and microservices architecture Experience working with Git for version control Comfortable working in Unix/Linux environments and command-line tools Experience with databases and SQL (Oracle preferred) Experience with Spring / Spring Boot Nice to have Experience with Test-Driven Development (TDD) Knowledge of scripting languages such as Python or Bash Experience working within a QA or testing-focused team Understanding of application monitoring and observability tools The role has a Hybrid model : candidates form Cracow 6x per month, outside of Cracow 3 - 5 x per month, from Warsaw 6x per month