Senior Backend Developer (.NET)

🏢 Summary: Junior .NET Developer role focused on building and enhancing a next-generation payment processing platform using modern backend technologies. The position involves implementing backend features, contributing to microservices-based solutions, and learning best practices within an agile team environment. It offers hands-on experience with modern .NET stack and cloud-oriented development. 🗂️ Requirements: Completed degree in Computer Science or related field, Hands-on experience with C#, Experience with ASP.NET Core, Basic knowledge of relational databases, Knowledge of MSSQL, Understanding of Entity Framework Core, Interest in microservices architecture, Interest in cloud environments, Willingness to learn Kafka and CI/CD, Ability to write clean and maintainable code 📃 Skills: C#, .NET, ASPNETCore, MSSQL, EntityFrameworkCore, Microservices, Kafka, CICD, Cloud, SQL 🏢 Description: Responsibilities Support the development of a next-generation payment processing platform built using latest versions of .NET . Implement backend features under the guidance of experienced developers, focusing on clean, reliable and maintainable code. Collaborate within small agile teams, participate in daily activities, and learn best practices through code reviews and mentoring. Work with modern .NET technologies and tools to help solve real business problems and continuously improve the platform. Contribute to team discussions, share ideas, and proactively develop your skills in a supportive engineering environment. Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Successfully completed university degree in computer science or a comparable field of study. Some hands-on experience with C# and ASP.NET Core (projects, internships, academic work or commercial experience). Basic understanding of relational databases (preferably MSSQL ) and Entity Framework Core . Interest in microservices , cloud environments and modern backend development patterns. Eagerness to learn technologies such as Kafka , CI/CD, and agile development practices. Ability to write simple, clean and well-structured code with openness to feedback. Fluency in Polish and good communication skills in English . Availability to work in a hybrid setup. About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: Frontend Developer role focused on building modern, high-performance web applications from scratch using React and TypeScript within an agile, international financial services initiative. The position involves contributing to architecture, participating in sprint planning, performing code reviews, and mentoring junior developers. Work is delivered in a remote/hybrid model within a multidisciplinary agile team. 🗂️ Requirements: University degree in Computer Science or related field, Minimum 4 years of frontend development experience, Strong experience with React and TypeScript, Experience with React Router, GraphQL and Apollo Client, Experience with LESS, JavaScript, HTML and CSS, Experience working with Scrum, Kanban or SAFe, Experience with Webpack and npm, Fluency in Polish, Very good English communication skills, Availability for remote/hybrid work with monthly office visits 📃 Skills: React, TypeScript, ReactRouter, GraphQL, Apollo, LESS, JavaScript, HTML, CSS, Webpack, npm, Scrum, Kanban, SAFe 🏢 Description: Responsibilities As part of a new international business initiative, you will contribute to building from scratch a technology-oriented company focused on innovating the IT delivery model for a major player in the European Financial Services industry. You will join a multidisciplinary, agile team of experts and develop modern, high-performance web applications using React and TypeScript . Working closely with your agile team, you will help define sprint goals, provide estimates, propose solutions for complex challenges and contribute to architectural decisions. You will guide and support junior engineers, helping them grow, ensuring quality contributions and fostering a collaborative team culture. Code reviews will be part of your daily routine, and you will actively help colleagues by sharing best practices, offering constructive feedback and contributing to continuous improvement. Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Successfully completed university degree in computer science or a comparable field of study. At least 4 years of experience in frontend development , with a strong focus on React and TypeScript . Excellent knowledge of React , React Router , GraphQL , Apollo Client , LESS , AntDesign , JavaScript , HTML and CSS. Hands-on experience with agile methodologies such as Scrum, Kanban or SAFe. Experience with Webpack and npm for build and package management. Fluency in Polish and very good communication in English Availability to work in a remote/hybrid mode . Remote workers, we invite to the office once every month . About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: The offer is for a Java Developer to build and maintain modern microservices applications within a large agile team. The role involves designing solutions, estimating tasks, performing code reviews, and deploying cloud-based services in AWS. It requires strong backend development expertise and experience with distributed systems in a cloud environment. 🗂️ Requirements: Completed degree in Computer Science or related field, Minimum 3 years of professional software development experience, Strong experience with Java, Strong experience with Spring and Spring Boot, Understanding of microservices architecture, Hands-on experience with Kafka, Hands-on experience with MongoDB, Hands-on experience with Oracle, Experience with AWS cloud and cloud deployments, Knowledge of Docker, Experience with Kubernetes or OpenShift, Experience with Agile methodologies, Experience with TDD, Ability to write clean, maintainable and testable code, Very good English and Polish language skills 📃 Skills: Java, Spring, SpringBoot, SpringDataJPA, Microservices, Kafka, MongoDB, Oracle, AWS, Docker, Kubernetes, OpenShift, Scrum, Kanban, XP, TDD 🏢 Description: Responsibilities You will join a vast multidisciplinary agile team of experts and develop modern microservices applications You will take care of the relationship with the business customers in order to understand their needs and expectations Together with your agile team, you will define the next sprint, provide estimates and create solution proposals for complicated tasks Code reviews are standards here and you will help colleagues by giving them advice and providing insightful hints for their growth Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can select medical care packages, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you have access to the platform where you can practice your language skills. Regular and systematic further training opportunities - internal and external ones. We support your development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Completed university degree in Computer Science or a related field 3+ years of professional experience in software development Strong experience in Java and Spring ecosystem (Spring, Spring Boot, Spring Data JPA) and solid understanding of microservices architecture Hands-on experience with Kafka, MongoDB, Oracle and AWS cloud , including deployment and maintenance of cloud-based applications Knowledge of Docker and container orchestration platforms such as Kubernetes or OpenShift Practical experience with Agile methodologies (Scrum, Kanban, XP), TDD and writing clean, maintainable and testable code Experience in Banking, Finance or Payments domains will be a strong plus. Very good communication skills in English and Polish and availability to work in a remote or hybrid model (office visit once per month) About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: Full Stack Developer role focused on designing, building, and operating AWS-native backend and frontend systems for managing merchant and terminal master data. The position involves developing React UIs and Node.js APIs, building GraphQL integrations, and implementing scalable serverless architectures on AWS. The role includes architectural responsibilities and deployment automation using AWS CDK and GitHub Actions. 🗂️ Requirements: Degree in Computer Science, Mathematics, Physics or related field, 6+ years of experience as Full Stack Developer, Strong experience with TypeScript and Node.js in backend development, Experience with Java in distributed system landscape, Hands-on experience with AWS serverless services, Experience with AWS Lambda and Aurora PostgreSQL, Experience with infrastructure as code using AWS CDK, Experience building and maintaining React-based frontends, Experience designing and implementing scalable architectures, Experience with GraphQL APIs and system integrations 📃 Skills: TypeScript, Node.js, Java, AWS, Lambda, Aurora, PostgreSQL, CDK, React, GraphQL, GitHubActions, Serverless 🏢 Description: Responsibilities We need your support in designing, developing and operating backend and frontend systems that manage master data for merchants, terminals and related entities using TypeScript and Node.js , running natively on AWS You will work on databases and GraphQL APIs and build integrations with other systems such as merchant onboarding, billing and reporting using AWS-native services You will develop and maintain React-based user interfaces for partners and merchants as well as Node.js-based APIs for customers and other stakeholders deployed on AWS serverless infrastructure Together with your team you will design and implement AWS-native architectures that meet high reliability and scalability requirements in real-world production environments You will write and maintain production-grade frontend and backend code and deploy and operate systems in AWS using AWS CDK, native AWS services, and GitHub Actions pipelines Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Successfully completed a degree in computer science, mathematics, physics, or a comparable field of study 6+ years of experience as a Full Stack Developer with exposure to architectural responsibilities Strong experience working with TypeScript and Node.js in backend development and Java in the wider system landscape Hands-on experience with AWS , with a strong focus on serverless services such as Lambda, Aurora (PostgreSQL), and infrastructure as code using AWS CDK Knowledge and practical experience in agile methodologies and understanding its principles Very good communication in English and Polish Availability to work in a hybrid mode with at least 1 visit in the office per month About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: Mid-level DevOps Engineer role focused on supporting .NET projects by designing, automating, and maintaining cloud infrastructure and CI/CD processes in Microsoft Azure. The position combines DevOps responsibilities with deep understanding of the .NET application lifecycle and close collaboration with development teams. It involves Infrastructure as Code, environment monitoring, and production issue resolution. 🗂️ Requirements: University degree in Computer Science or related field, 2–4 years of commercial IT experience, Hands-on experience with Microsoft Azure, Practical experience with Azure DevOps, Practical experience with PowerShell, Practical experience with Bicep, Scripting skills in Bash or PowerShell, Strong understanding of CI/CD concepts, Experience as DevOps Engineer on .NET projects or .NET Developer experience, Fluency in Polish, Very good communication skills in English, Availability for remote/hybrid work mode 📃 Skills: Azure, AzureDevOps, PowerShell, Bicep, Bash, .NET, CI/CD, IaC 🏢 Description: Responsibilities As a Mid-level DevOps Engineer at Nexi Digital, you will work on projects based on .NET technology , supporting development teams in the design, automation, and maintenance of infrastructure and software delivery processes. This role combines DevOps responsibilities with a solid understanding of the .NET application lifecycle , architecture, and the needs of development teams. Designing, developing, and maintaining cloud infrastructure in Microsoft Azure Automating CI/CD processes for .NET applications Implementing Infrastructure as Code (IaC) using Bicep Maintaining and monitoring environments (stability, availability, security) Close collaboration with .NET Development teams in the area of builds, deployments, environment configuration Diagnosing and resolving environmental and production issues Participating in initiatives aimed at improving platform reliability and quality Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Successfully completed university degree in computer science or a comparable field of study Minimum 2–4 years of commercial experience in IT Hands-on experience with Microsoft Azure Practical knowledge of tools: Azure DevOps, PowerShell, Bicep Scripting: Bash / PowerShell Very good understanding of CI/CD concepts Experience working as a DevOps Engineer on .NET projects or experience as a .NET Developer (current or past) with a strong interest in transitioning towards DevOps Fluency in Polish and very good communication in English Availability to work in a remote/hybrid mode. Remote workers, we invite to the office once every month. Nice to have Microsoft Azure certification Experience in regulated environments (fintech / payments) Basic knowledge of application and infrastructure security About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: Mid-level DevOps Engineer role focused on supporting .NET projects by designing and maintaining Azure-based cloud infrastructure and automating CI/CD processes. The position combines DevOps practices with deep understanding of the .NET application lifecycle and close collaboration with development teams. Responsibilities include Infrastructure as Code, environment monitoring, and production support in a cloud environment. 🗂️ Requirements: University degree in Computer Science or related field, 2–4 years of commercial IT experience, Hands-on experience with Microsoft Azure, Practical experience with Azure DevOps, PowerShell, Bicep, Experience with Bash or PowerShell scripting, Strong understanding of CI/CD concepts, Experience as DevOps Engineer on .NET projects or .NET Developer transitioning to DevOps, Fluency in Polish, Very good English communication skills, Availability for remote/hybrid work mode 📃 Skills: Azure, AzureDevOps, PowerShell, Bicep, Bash, .NET, CI/CD, IaC 🏢 Description: Responsibilities As a Mid-level DevOps Engineer at Nexi Digital, you will work on projects based on .NET technology , supporting development teams in the design, automation, and maintenance of infrastructure and software delivery processes. This role combines DevOps responsibilities with a solid understanding of the .NET application lifecycle , architecture, and the needs of development teams. Designing, developing, and maintaining cloud infrastructure in Microsoft Azure Automating CI/CD processes for .NET applications Implementing Infrastructure as Code (IaC) using Bicep Maintaining and monitoring environments (stability, availability, security) Close collaboration with .NET Development teams in the area of builds, deployments, environment configuration Diagnosing and resolving environmental and production issues Participating in initiatives aimed at improving platform reliability and quality Qualifications Successfully completed university degree in computer science or a comparable field of study Minimum 2–4 years of commercial experience in IT Hands-on experience with Microsoft Azure Practical knowledge of tools: Azure DevOps, PowerShell, Bicep Scripting: Bash / PowerShell Very good understanding of CI/CD concepts Experience working as a DevOps Engineer on .NET projects or experience as a .NET Developer (current or past) with a strong interest in transitioning towards DevOps Fluency in Polish and very good communication in English Availability to work in a remote/hybrid mode. Remote workers, we invite to the office once every month. Nice to have Microsoft Azure certification Experience in regulated environments (fintech / payments) Basic knowledge of application and infrastructure security About Nexi Digital Nexi is Europe's PayTech company operating in high-growth, attractive European markets and technologically advanced countries. Listed on Borsa Italiana's MTA, Nexi has the scale, geographic reach and abilities to drive the transition to a cashless Europe. With its portfolio of innovative products, e-commerce expertise and industry-specific solutions, Nexi provides flexible support for the digital economy and the entire payment ecosystem globally, across a broad range of different payment channels and methods. Nexi’s technological platform and the best-in-class professional skills in the sector lets the company operate at its best in three market segments: Merchant Services & Solutions, Cards & Digital Payments and Digital Banking & Corporate Solutions. Nexi constantly invests in technology and innovation, focusing on two fundamental principles: meeting, together with its partner banks, customer needs and creating new business opportunities for them. Nexi is committed to supporting people and businesses of all sizes, transforming the way people pay and businesses accept payments. It offers companies the most innovative and reliable solutions to better serve their customers and expand. By simplifying payments and enabling people and businesses to build closer relationships and grow together, Nexi promotes progress to benefit everyone.

🏢 Summary: Senior Backend Engineer role focused on building and scaling payments infrastructure for SaaS products using Node.js and NestJS in a microservices environment. The position involves integrating and maintaining payment providers such as Stripe and orchestration platforms, optimizing PostgreSQL databases, and ensuring high system performance and reliability. Fully remote role within Europe, offering long-term engagement on high-traffic global products. 🗂️ Requirements: 5+ years commercial experience with Node.js and RESTful APIs, 1+ year commercial experience with NestJS, 1+ year experience integrating and maintaining Stripe, 1+ year experience integrating and maintaining payment orchestration platforms (Primer, Gr4vy, or Spreedly), Hands-on experience with full payment lifecycle (authorization, capture, refunds, webhooks, reconciliation), Strong experience with third-party API integrations, Advanced PostgreSQL experience with ORM, Experience designing scalable schemas and optimizing performance, Experience with unit and integration testing (Jest), Experience with observability and monitoring in distributed systems, Understanding of microservice architecture and service-oriented architecture, Strong knowledge of OOP and design patterns, Experience with Docker and Kubernetes, Proficient English (written and spoken) 📃 Skills: Node.js, NestJS, Stripe, Primer, Gr4vy, Spreedly, REST, PostgreSQL, ORM, Jest, Docker, Kubernetes, Microservices, OOP, GroundCover, Redis, AWS, CI/CD, Adyen, Checkout.com, PayPal, React, Next.js, HTML, CSS, GitHub Copilot, Cursor, ChatGPT 🏢 Description: Senior Backend Engineer (Payments focused) Position Title: Senior Backend Engineer (Payments focused) Department: Business & Product Reports To: Technical Delivery Manager Location: Remote / Europe Date: ASAP Projects & Initiatives: Multi-project Node.js       NestJS       Stripe (Adyen, Checkout.com , PayPal) PostgreSQL       Microservices 1. Job Purpose We're a fast-growing tech company with a portfolio of SaaS products serving diverse industries. Innovation, performance, and design precision are core to our values. As we scale, we're looking for a Senior Back-End Engineer to take a key role in crafting highly performant, maintainable, and user-focused web applications, with a strong focus on payments infrastructure across multiple products. 2. Key Responsibilities – Participate in daily team routines, stand-ups, sprint planning, and retrospectives. – Actively contribute to sprint work: feature development, code reviews, and merge requests. – Develop testable, maintainable code; troubleshoot and debug issues as they arise. – Gather and evaluate requirements in collaboration with the Tech Lead, Product Manager, and fellow engineers. – Translate requirements into solid backend features – Integrate software components into a fully functional system – Collaborate effectively with Product, Engineering, QA, and Customer Support – Integrate with third-party APIs and monitor system performance – Apply engineering best practices and agreed standards consistently – Prepare and present technical ideas to internal teams and stakeholders 3. Requirements MUST HAVE – 5+ years of commercial experience with Node.js and RESTful APIs – 1+ year of commercial experience with NestJS – 1+ year integrating and maintaining Stripe – 1+ year integrating and maintaining a payment orchestration platform, Primer, Gr4vy, or Spreedly – Proficient in English, written and spoken ALSO REQUIRED – Hands-on experience with the full payment lifecycle: ◦ Authorization, capture, refunds, webhooks, reconciliation ◦ Third-party API integrations – Thorough understanding of web application and microservice architecture – Comprehensive understanding of OOP, design patterns, and service-oriented architecture – Advanced PostgreSQL experience with ORM: ◦ Designing scalable schemas ◦ Performance optimization ◦ Schema and data migrations under heavy load – Experience with unit and integration tests, e.g., Jest – Experience with observability and monitoring in distributed environments, e.g., GroundCover – Knowledge of application performance optimization techniques – Understanding of web technologies – Comfortable with Docker and Kubernetes – Hands-on with modern AI development tools, e.g., GitHub Copilot, Cursor, ChatGPT, or similar – Strategic thinker with a problem-solver mindset – Able to work autonomously in a fast-paced, agile, remote environment – Strong communication skills and experience working with distributed teams 4. Nice to Have – Experience with other payment processors, Adyen, Checkout.com , and PayPal – Understanding of payment performance processes, EFWs, chargebacks, and refunds – Experience with Redis – Familiarity with CI/CD tools and practices – Experience with AWS – React.js / Next.js – HTML / CSS – Experience with SaaS products – Past or current Tech Lead experience 5. What We Offer – Full-time, long-term role – 22 days paid leave + local bank holidays – 100% remote – Flexible hours, core window 7:00–18:00 EET – High-traffic, global SaaS products, real scale, real impact

🏢 Summary: Senior Backend Engineer role focused on building and scaling payment infrastructure across multiple SaaS products using Node.js and microservices. The position involves developing high-performance backend systems, integrating payment providers, and optimizing PostgreSQL databases in a distributed environment. The engineer will own payment lifecycle integrations and contribute to scalable, maintainable backend architecture. 🗂️ Requirements: 5+ years commercial experience with Node.js and RESTful APIs, 1+ year commercial experience with NestJS, 1+ year experience integrating and maintaining Stripe, 1+ year experience with payment orchestration platforms (Primer, Gr4vy, or Spreedly), Hands-on experience with full payment lifecycle (authorization, capture, refunds, webhooks, reconciliation), Experience with third-party API integrations, Strong understanding of microservices architecture, Advanced PostgreSQL experience with ORM, Experience with unit and integration testing, Experience with observability and monitoring tools, Experience with Docker and Kubernetes, Experience with AI development tools (e.g., Copilot, ChatGPT), Fluent English (written and spoken) 📃 Skills: Node.js, NestJS, Stripe, Primer, Gr4vy, Spreedly, REST, PostgreSQL, ORM, Jest, GroundCover, Docker, Kubernetes, Redis, AWS, React, Next.js, HTML, CSS, Adyen, Checkout, PayPal, CI/CD 🏢 Description: Senior Backend Engineer (Payments focused) Position Title: Senior Backend Engineer (Payments focused) Department: Business & Product Reports To: Technical Delivery Manager Location: Remote / Europe Date: ASAP Projects & Initiatives: Multi-project Node.js       NestJS       Stripe (Adyen, Checkout.com , PayPal) PostgreSQL       Microservices 1. Job Purpose We're a fast-growing tech company with a portfolio of SaaS products serving diverse industries. Innovation, performance, and design precision are core to our values. As we scale, we're looking for a Senior Back-End Engineer to take a key role in crafting highly performant, maintainable, and user-focused web applications, with a strong focus on payments infrastructure across multiple products. 2. Key Responsibilities – Participate in daily team routines, stand-ups, sprint planning, and retrospectives. – Actively contribute to sprint work: feature development, code reviews, and merge requests. – Develop testable, maintainable code; troubleshoot and debug issues as they arise. – Gather and evaluate requirements in collaboration with the Tech Lead, Product Manager, and fellow engineers. – Translate requirements into solid backend features – Integrate software components into a fully functional system – Collaborate effectively with Product, Engineering, QA, and Customer Support – Integrate with third-party APIs and monitor system performance – Apply engineering best practices and agreed standards consistently – Prepare and present technical ideas to internal teams and stakeholders 3. Requirements MUST HAVE – 5+ years of commercial experience with Node.js and RESTful APIs – 1+ year of commercial experience with NestJS – 1+ year integrating and maintaining Stripe – 1+ year integrating and maintaining a payment orchestration platform, Primer, Gr4vy, or Spreedly – Proficient in English, written and spoken ALSO REQUIRED – Hands-on experience with the full payment lifecycle: ◦ Authorization, capture, refunds, webhooks, reconciliation ◦ Third-party API integrations – Thorough understanding of web application and microservice architecture – Comprehensive understanding of OOP, design patterns, and service-oriented architecture – Advanced PostgreSQL experience with ORM: ◦ Designing scalable schemas ◦ Performance optimization ◦ Schema and data migrations under heavy load – Experience with unit and integration tests, e.g., Jest – Experience with observability and monitoring in distributed environments, e.g., GroundCover – Knowledge of application performance optimization techniques – Understanding of web technologies – Comfortable with Docker and Kubernetes – Hands-on with modern AI development tools, e.g., GitHub Copilot, Cursor, ChatGPT, or similar – Strategic thinker with a problem-solver mindset – Able to work autonomously in a fast-paced, agile, remote environment – Strong communication skills and experience working with distributed teams 4. Nice to Have – Experience with other payment processors, Adyen, Checkout.com , and PayPal – Understanding of payment performance processes, EFWs, chargebacks, and refunds – Experience with Redis – Familiarity with CI/CD tools and practices – Experience with AWS – React.js / Next.js – HTML / CSS – Experience with SaaS products – Past or current Tech Lead experience 5. What We Offer – Full-time, long-term role – 22 days paid leave + local bank holidays – 100% remote – Flexible hours, core window 7:00–18:00 EET – High-traffic, global SaaS products, real scale, real impact

🏢 Summary: Senior .NET Developer role focused on building and maintaining secure, high-performance online banking solutions in a distributed Agile environment. The position involves developing backend features in .NET 8, optimizing SQL-based data access, and working with containerized applications. Hybrid work model with strong emphasis on reliability, security, and collaboration. 🗂️ Requirements: Minimum 4 years of experience in IT system development, Hands-on experience with .NET, especially .NET 8, Strong knowledge of PostgreSQL, Strong knowledge of MS SQL, Experience with Docker, Experience with Kubernetes, Practical experience in Agile software development, Experience in developing new features and maintaining existing systems, Good command of Polish, Legal right to work in the European Union 📃 Skills: .NET, C#, PostgreSQL, MSSQL, SQL, Docker, Kubernetes, Agile 🏢 Description: Ignite digital innovation — shape the future of online banking! Warszawa-based opportunity with hybrid work model (2 days in the office/month, up to 4 remote days/week). As a Senior .NET Developer , you will be working for our client, a leader in online banking, supporting the development and maintenance of secure, high-performance financial solutions. You’ll join a dynamic team dedicated to building cutting-edge banking functionalities, ensuring top-tier reliability and innovation. Operating within a distributed Agile environment, you’ll play a pivotal role in implementing complex backend logic while collaborating seamlessly across teams. This is your chance to contribute to transformative financial technology and accelerate your career growth. Your main responsibilities: Design and develop new features in .NET 8 to enhance banking solutions. Implement and optimize SQL-based data access for performance and security. Build and maintain containerized applications using Docker and Kubernetes. Collaborate with distributed teams within an Agile framework. Participate in the development of secure payment solutions. Share knowledge and mentor less experienced team members. Ensure code quality through reviews and testing. Maintain existing functionalities and address production issues. Manage your time effectively while working remotely. You're ideal for this role if you have: At least 4 years of experience in IT system development. Solid hands-on experience with .NET (especially .NET 8). Strong knowledge of PostgreSQL and MS SQL. Practical understanding of Agile software development. Excellent communication and collaboration skills in distributed teams. Ability to work independently and manage your responsibilities. Experience developing new features and maintaining existing ones. Passion for software development and continuous learning. Experience with Docker and Kubernetes. It is a strong plus if you have: (optional) Certifications in relevant technologies. Experience with financial or payment systems. Language Required for the role: Good command of Polish. Eligibility to work on this role: 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 .NET Developer role focused on building and enhancing distributed microservices for digital banking systems in a European financial environment. The position involves designing scalable, high-quality solutions using C# and .NET, implementing asynchronous communication, and ensuring robust automated testing practices. Remote-first model with collaboration on complex financial platforms. 🗂️ Requirements: 5+ years of experience in C# and .NET development, Strong experience with microservices architecture, Knowledge of CQRS, REST, OOP, EventSourcing, Experience with RabbitMQ or Kafka, Experience with NoSQL and relational databases, Experience with automated testing (unit, integration, contract), Knowledge of DomainDrivenDesign principles, Understanding of BPMS workflows, Experience with Git, Good command of Polish, Legal right to work in the EU 📃 Skills: C#, .NET, Microservices, CQRS, REST, OOP, EventSourcing, RabbitMQ, Kafka, Git, NoSQL, SQL, Docker, Testcontainers, Pact, DomainDrivenDesign, BPMS 🏢 Description: Unleash innovation — revolutionize financial systems with expert .NET development! Wroclaw-based opportunity with remote work model (5 remote days per week). As a Senior .NET Developer , you will be working for our client, a leading financial organization committed to transforming the digital banking experience. You’ll contribute to building and enhancing distributed microservices that enable seamless financial operations across Europe, driving innovation and operational excellence. Your main responsibilities: Develop and maintain scalable, high-quality microservices using C# and .NET technologies following Domain-Driven Design principles. Design and implement asynchronous communication patterns with RabbitMQ or Kafka to ensure system robustness. Collaborate with cross-functional teams to create automated tests, including unit, integration, and contract tests, utilizing Docker, Testcontainers, and Pact. Optimize code for performance, scalability, and reliability, adhering to Clean Code standards. Implement RESTful APIs and work with NoSQL and relational databases for effective data management. Contribute to the continuous improvement of development processes and best practices. Engage proactively in team collaboration, sharing knowledge and solving complex technical challenges. You're ideal for this role if you have: Minimum of 5 years of experience in C# and .NET development in a senior role. Understanding of workflows in BPMS platforms. Strong knowledge of microservices architecture, CQRS, REST, OOP, and Event Sourcing. Practical experience with asynchronous messaging (RabbitMQ/Kafka), Git, NoSQL databases, and relational databases. Familiarity with automated testing frameworks, including unit, integration, and contract testing. Good understanding of Domain-Driven Design (DDD) principles and clean code practices. Excellent team collaboration skills and a responsible, engaged work attitude. It is a strong plus if you have: Experience with Polish language communication skills. Knowledge of automated testing tools and frameworks. Language Required for the role: Polish: Good command Eligibility for the role: 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.