Software Architect (Backend & APIs)

🏢 Summary: Development of a secure, scalable analytics platform for the banking sector, focused on building and maintaining Java-based backend services and REST APIs in a microservices architecture. The role involves implementing analytical and reporting functionalities, ensuring high code quality, security, and performance within a Scrum-driven project. The system is designed as a mobile-first, WCAG-compliant solution with high availability standards. 🗂️ Requirements: 2.5+ years of commercial experience, Very good knowledge of Java 8+ (lambdas, streams, exceptions, multithreading), Strong experience with Spring Framework, Knowledge of REST API, JSON, HTTP, Understanding of OOP and clean code principles (SOLID, DRY, KISS), Experience with SQL databases (PostgreSQL or MySQL), Basic knowledge of NoSQL databases, Experience with Git (pull requests, rebase, merge, conflicts), Experience with JUnit or TestNG and unit/integration testing, Basic knowledge of Docker, Basic knowledge of CI/CD, Ability to work with IDE, Ability to read and write technical documentation in English 📃 Skills: Java, Spring, REST, JSON, HTTP, SQL, PostgreSQL, MySQL, NoSQL, Git, JUnit, TestNG, Docker, CI/CD, OOP, SOLID, DRY, KISS, Multithreading, Microservices 🏢 Description: About the project The goal of the project is to design and build a modern, scalable analytics platform for the banking sector. It will support the creation, management, publishing, and distribution of analytical content prepared by the Investment Analysis team of the brokerage office. Initially, the system will be used by institutional clients, and later also by individual clients. The platform will help analysts better use their expertise, reduce manual work, and organize a large amount of analytical content, including market comments, company analyses, valuations, financial results comments, and sector reports. It will also provide clear data on how users consume the reports. The solution must meet high standards of security and availability. It will be designed with a mobile-first approach, fully responsive (RWD), and compliant with WCAG 2.0 standards. Project duration: 10–11 months. Responsibilities: Design, develop, and maintain backend applications using Java in accordance with agreed functional and technical specifications Implement new features and modify existing ones within project-based delivery models focused on defined technical outcomes Develop clean, maintainable, and scalable code that complies with established architectural and quality standards Design application modules and data exchange interfaces, ensuring scalability and security Implement REST APIs and backend modules supporting analytical and reporting use cases Participate in microservices development and integration with external systems Participate actively in code reviews (both giving and receiving feedback) Participate in the analysis of technical requirements and the creation of technical documentation Develop and maintain unit and integration tests covering implemented business logic Create and maintain technical documentation Prepare basic performance analyses and propose optimization actions (including code refactor) Analyse bugs and assist in resolving them (debugging, logs) Participate in Scrum-driven software development lifecycle Cooperate with project teams, including PM, QA, DevOps, and other developers, during technical and integration activities Use AI-assisted development tools to improve coding efficiency, test generation, and code quality Requirements: 2.5+ years of commercial experience Very good knowledge of Java (8+), including lambda, streams, exceptions, multithreading Strong experience with Spring Framework Good knowledge of REST API, JSON, HTTP Good understanding of OOP and good practices/ clean-code values (SOLID, DRY, KISS etc.) Solid knowledge and experience with databases: SQL (PostgreSQL, MySQL), basic NoSQL knowledge is a plus Familiarity with Git (pull requests, rebase, merge, conflicts) Experience with JUnit/TestNG, unit and integration testing Basic knowledge of tools such as Docker, and CI/CD basics Proficiency with IDE Ability to read and produce technical documentation in English Nice to have: Experience with message brokers (Kafka, RabbitMQ) Proficiency in modern AI-enhanced IDEs, including JetBrains IDEs, Cursor and Trae Familiarity with AI-assisted test generation and debugging tools, such as Qodo Experience in banking, fintech, or analytics-heavy enterprise systems Experience working with international clients or in cross-functional, distributed teams (e.g., across different time zones) is a plus Soft skills: awareness of the client’s business needs and project context Strong problem-solving skills and ability to work independently Strong analytical and problem-solving skills Experience in code review and openness to constructive feedback Effective team communication, with experience in client-facing roles (depending on the project) Responsibility for delivered code quality and deadlines What do we offer? ambitious, creative, talented & highly experienced team contributing to projects for clients all over the world flexible working hours and a possibility to work remotely We value your trust in providing us your data, thus we are striving to use commercially acceptable means of protecting it. Below you will find the necessary information about the data we collect and process when you send us your CV. The controller of your personal data is Miquido Spółka z ograniczoną odpowiedzialnością sp. k. with its seat in Krakow, Zabłocie 43a, 30-701 Kraków, Poland (“Miquido”, “We”, “Our” or “Us”).

🏢 Summary: Short-term Senior Fullstack Developer / Solution Architect role focused on leading the architecture of a regulated digital capital markets platform. The position involves designing scalable, secure backend services and integrating fintech, KYC/AML, and blockchain solutions. You will define technical standards, drive architectural decisions, and ensure compliance, security, and reliability across the system. 🗂️ Requirements: Extensive experience in backend and distributed systems architecture, Strong expertise in Node.js and TypeScript, Experience with service-based and integration-heavy architectures, Strong knowledge of API design and security, Experience with authentication and authorization mechanisms, Experience with Prisma ORM or similar ORM, Strong knowledge of relational databases and data modeling, Experience in regulated environments (fintech or banking), Ability to design scalable, secure, and compliant systems, English proficiency for technical collaboration 📃 Skills: Node.js, TypeScript, REST, GraphQL, Prisma, SQL, KYC, AML, OAuth, JWT, Blockchain, APIs, Microservices, Architecture 🏢 Description: SENIOR FULLSTACK DEVELOPER / SOLUTION ARCHITECT B2B: 130 - 150 PLN / hour START - 1 JULY TERM - 6 WEEKS; 0,5 FTE LOCATION: POLAND (REMOTE) *We offer a hybrid work model, allowing you to balance office presence with remote work. However, it's important to note that the role emphasizes a stronger presence in the office to foster teamwork and effective communication. Requirements Key Duties and Services: A Roadmap to Your Professional Success Your Mission : We are looking for an experienced Senior Fullstack Developer / Solution Architect to lead the design and evolution of a regulated digital capital market platform. The platform includes investor onboarding, KYC/AML verification, identity management, investor classification, access control, audit logging, digital wallets, and integrations with fintech and blockchain service providers. You will take ownership of architectural direction, define technical standards, and work closely with engineering, product, and business stakeholders to deliver scalable and compliant solutions Scope of services: Defining and evolving the overall backend architecture of the platform Designing scalable, secure services using Node. js + TypeScript Establishing architecture standards, modular structure, and best practices Leading technical design discussions and architecture decisions Designing integration strategies for: KYC/AML providers, Identity verification services, Fintech APIs, Blockchain / digital asset infrastructure Ensuring compliance, auditability, security, and regulatory requirements are embedded in system design Designing API architecture (REST / GraphQL where applicable) Defining authentication, authorization, and access control strategies Supporting engineering teams via architecture reviews and technical mentoring Collaborating with business stakeholders to translate requirements into technical solutions Driving decisions around scalability, reliability, observability, and maintainability Here’s the set we are required: Extensive experience designing backend / distributed systems architecture Strong expertise in Node. js + TypeScript ecosystems Experience with integration-heavy, service-based architectures Strong understanding of API design, security, authentication, authorization Experience with Prisma ORM or similar persistence layers Strong knowledge of relational databases and data modeling Experience working in regulated environments (fintech, banking, etc.) Ability to balance business, compliance, and technical constraints Strong communication and stakeholder management skills English proficiency for direct technical and business collaboration Nice to have: Experience in capital markets, fintech, banking, or investment platforms Knowledge of KYC/AML workflows and compliance frameworks Experience with blockchain, wallets, tokenization, digital assets Experience with GraphQL integrations Familiarity with cloud-native architectures and DevOps practices Previous experience as Lead Developer, Principal Engineer, or Architect Career Advancement at Your Fingertips: Explore Opportunities with Us By joining us you will get: Opportunity to define architecture for a regulated fintech platform High-impact role with real ownership over system design Collaboration with senior engineering and business stakeholders Work on complex fintech + blockchain + identity systems Strong focus on scalability, compliance, and system design excellence Navigating the Hiring Process: What does the recruitment process for that position look like? HR Screening with Talent Acquisition Specialist (30 min) Technical Interview (60 min) Interview with Delivery Manager (30 min) Job Offer

🏢 Summary: Software Engineer role focused on modernizing a mission-critical aviation platform by developing cloud-hosted backend services and scalable cloud-native solutions in AWS. The position involves backend modernization, Kubernetes and container management, CI/CD automation, and operational reliability improvements in a distributed engineering environment. The role offers hybrid work flexibility, B2B or UoP employment, and benefits including healthcare and life insurance. 🗂️ Requirements: Experience developing backend applications in cloud environments, Strong knowledge of AWS and cloud-native architectures, Hands-on experience with Linux, Hands-on experience with Docker, Hands-on experience with Apache, Hands-on experience with Java, Hands-on experience with Spring Boot, Experience with Kubernetes and containerized workloads, Experience with CI/CD, Experience with Infrastructure as Code, Experience with automation, Understanding of cloud security, Understanding of monitoring and production support practices, Strong troubleshooting and problem-solving skills, Ability to work independently and collaborate within distributed teams, English level B2 or higher 📃 Skills: AWS, Linux, Docker, Apache, Java, Spring, Kubernetes, CI/CD, IaC, Automation, SQL, MySQL, Security, Monitoring 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities - Develop and modernize backend services hosted in AWS - Design and implement scalable, resilient cloud-native solutions - Build and improve APIs, integrations, and automated backend processes - Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability - Manage and troubleshoot Kubernetes-based environments and containerized applications - Support production systems and drive reliability, security, and operational improvements - Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions - Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile - Experience developing backend applications in cloud environments - Strong knowledge of AWS and cloud-native architectures - Hands-on experience with Linux, Docker, Apache, Java and Spring Boot - Experience with Kubernetes and containerized workloads - Experience with CI/CD, Infrastructure as Code, and automation - Understanding of cloud security, monitoring, and production support practices - Strong troubleshooting and problem-solving skills - Ability to work independently and collaborate within distributed teams - English min. B2 Nice to Have - Experience modernizing legacy applications and services - Experience with SQL Server and MySQL - Experience building highly available and resilient production systems - Experience using AI-assisted software development tools Conditions - Employment type: B2B or UoP - Location: Gdańsk - Work model: 1 day a week in the office in Gdańsk or less frequently, depending on your availability - Salary: 190 PLN net/h - to negotiate Benefits - Life insurance - Private healthcare - Multisport card

🏢 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: 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: Opportunity to modernize a mission-critical aviation platform by designing and developing cloud-hosted backend services in a scalable, cloud-native AWS environment. The role focuses on building resilient APIs, improving automation and CI/CD pipelines, and managing Kubernetes-based infrastructure to support global aviation data distribution. You will contribute to a large-scale modernization initiative emphasizing scalability, security, and operational excellence. 🗂️ Requirements: Experience developing backend applications in cloud environments, Hands-on experience with Linux, Docker, Apache, and PHP or Java, Strong knowledge of AWS and cloud-native architectures, Experience with Kubernetes and containerized workloads, Experience with CI/CD and Infrastructure as Code, Understanding of cloud security, monitoring, and production support practices, Strong troubleshooting and problem-solving skills, English proficiency at minimum B2 level 📃 Skills: AWS, Linux, Docker, Apache, PHP, Java, Kubernetes, CI/CD, IaC, SQL, SQLServer, MySQL, AI 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities Develop and modernize backend services hosted in AWS Design and implement scalable, resilient cloud-native solutions Build and improve APIs, integrations, and automated backend processes Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability Manage and troubleshoot Kubernetes-based environments and containerized applications Support production systems and drive reliability, security, and operational improvements Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile Experience developing backend applications in cloud environments Hands-on experience with Linux, Docker, Apache, and PHP or Java Strong knowledge of AWS and cloud-native architectures Experience with Kubernetes and containerized workloads Experience with CI/CD, Infrastructure as Code, and automation Understanding of cloud security, monitoring, and production support practices Strong troubleshooting and problem-solving skills Ability to work independently and collaborate within distributed teams English min. B2. Nice to Have: Experience modernizing legacy applications and services Experience with SQL Server and MySQL Experience building highly available and resilient production systems Experience using AI-assisted software development tools Conditions Employment type: B2B or UoP Location: Gdańsk Work model: 1 day a week in the office in Gdańsk or less frequently, depending on your availability Salary: up to 190 PLN net/h Benefits: life insurance, private healthcare, Multisport card Recruitment steps Recruitment call with Agnieszka from KUBO Client interview (may require 2 rounds) Feedback and decision

🏢 Summary: The offer is for a Software Engineer to modernize and develop cloud-hosted backend services for a mission-critical aviation platform used globally. The role focuses on building scalable, resilient, cloud-native solutions in AWS, improving automation, CI/CD, and Kubernetes-based environments. You will contribute to transforming a legacy system into a modern, secure, and highly scalable ecosystem. 🗂️ Requirements: Experience developing backend applications in cloud environments, Hands-on experience with Linux, Docker, Apache, PHP, Strong knowledge of AWS and cloud-native architectures, Experience with Kubernetes and containerized workloads, Experience with CI/CD and Infrastructure as Code, Knowledge of cloud security and monitoring practices, Ability to troubleshoot production systems, English B2 level or higher 📃 Skills: AWS, Linux, Docker, Apache, PHP, Kubernetes, CI/CD, IaC, SQL, MySQL, SQLServer, AI 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities Develop and modernize backend services hosted in AWS Design and implement scalable, resilient cloud-native solutions Build and improve APIs, integrations, and automated backend processes Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability Manage and troubleshoot Kubernetes-based environments and containerized applications Support production systems and drive reliability, security, and operational improvements Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile Experience developing backend applications in cloud environments Hands-on experience with Linux, Docker, Apache, and PHP or Java Strong knowledge of AWS and cloud-native architectures Experience with Kubernetes and containerized workloads Experience with CI/CD, Infrastructure as Code, and automation Understanding of cloud security, monitoring, and production support practices Strong troubleshooting and problem-solving skills Ability to work independently and collaborate within distributed teams English min. B2. Nice to Have: Experience modernizing legacy applications and services Experience with SQL Server and MySQL Experience building highly available and resilient production systems Experience using AI-assisted software development tools Conditions Employment type: B2B or UoP Location: Gdańsk Work model: 1 day a week in the office in Gdańsk or less frequently, depending on your availability Salary: up to 190 PLN net/h Benefits: life insurance, private healthcare, Multisport card Recruitment steps Recruitment call with Agnieszka from KUBO Client interview (may require 2 rounds) Feedback and decision

🏢 Summary: Senior Backend Engineer role focused on transforming a mission-critical e-commerce domain supporting subscriptions and purchasing journeys for millions of users. The position centers on migrating a monolithic system to scalable microservices, improving performance and reliability, and shaping the future architecture of a global platform. Engineers will work with event-driven systems and modern AI tools while owning solutions end-to-end. 🗂️ Requirements: 5+ years of professional backend engineering experience, Strong experience designing and operating microservices architectures, Experience modernising legacy systems and decomposing monoliths, Solid understanding of distributed systems and scalable backend design, Commercial experience with Go, Java, Kotlin or Scala, Hands-on experience with Kafka or similar event-streaming technologies, Hands-on experience with PostgreSQL, Hands-on experience with Docker and Kubernetes, Experience with CI/CD pipelines, Practical experience using AI coding assistants (Claude Code, Cursor, Copilot or similar), Ability to review and validate AI-generated code, Comfortable owning solutions from idea to production 📃 Skills: Go, Golang, Java, Kotlin, Scala, Kafka, PostgreSQL, Docker, Kubernetes, CI/CD, GraphQL, DDD, TDD, BDD, Microservices 🏢 Description: Join a global e-commerce technology organisation serving millions of customers across multiple international markets. As a Senior Backend Engineer, you will become part of a team responsible for one of the company's most critical customer-facing domains. The platform supports customer subscriptions, plans, and purchasing journeys used daily by millions of users. This is not a maintenance role. The team is actively transforming a mission-critical domain, modernising legacy systems, reducing technical debt, and building the next generation of scalable services that will support future growth. You will play a key role in migrating core functionality from a monolithic architecture to modern microservices while helping shape the future architecture of a global platform. What You'll Do Build & Scale Core Services Design, develop, and maintain scalable backend services within a distributed microservices architecture. Build reliable systems supporting millions of customer interactions. Improve performance, reliability, and scalability across critical customer-facing services. Drive Modernisation Lead the migration of key business domains from monolithic systems to modern microservices. Reduce technical debt and improve long-term maintainability. Design solutions that support future platform growth. Shape Architecture Participate in architecture discussions and technical decision-making. Design orchestration layers supporting complex customer journeys and business processes. Help define engineering standards and best practices. Work with Event-Driven Systems Build and operate services powered by event-driven architectures. Work extensively with Kafka and real-time lifecycle events. Design resilient and observable distributed systems. Raise Engineering Standards Conduct code reviews and support other engineers through technical guidance. Promote best practices across software development, testing, deployment, and observability. Contribute to a strong culture of ownership and continuous improvement. AI-Powered Engineering Use modern AI tools and coding agents throughout the software development lifecycle. Leverage AI for onboarding, architecture exploration, implementation, testing, debugging, and productivity improvements. Apply engineering judgement to validate, verify, and safely integrate AI-generated outputs. What We're Looking For Backend Engineering Expertise 5+ years of professional backend engineering experience. Strong experience designing and operating microservices architectures. Experience modernising legacy systems and decomposing monoliths. Solid understanding of distributed systems and scalable backend design. Technical Stack Commercial experience with Go (Golang), Java, Kotlin or Scala Engineers coming from a JVM background should be open to working in a Go-driven environment. Hands-on experience with: Kafka or similar event-streaming technologies PostgreSQL Docker Kubernetes CI/CD pipelines Product & Ownership Mindset Comfortable owning solutions from idea through production. Strong problem-solving skills and ability to make technical trade-offs. Experience collaborating with product, business, and engineering stakeholders. AI Fluency Practical experience using AI coding assistants such as Claude Code, Cursor, Copilot, or similar tools. Understanding of how context, prompts, constraints, and validation influence AI-generated outputs. Ability to critically review and verify AI-generated solutions. Nice to Have Experience with subscription-based products. Experience in e-commerce environments. GraphQL knowledge. Familiarity with DDD, TDD, and BDD practices. What We Offer Opportunity to build systems used by millions of customers globally. High-impact engineering work with significant architectural ownership. International collaboration across distributed engineering teams. End-to-end ownership from idea to production. Hybrid working model (3 days per week in the Warsaw office). B2B cooperation model. 30 days of paid annual leave. Modern office located in Warsaw city centre. Continuous learning and professional growth opportunities.

🏢 Summary: Opportunity for a Senior Java Backend Developer to build and maintain a secure, large-scale public platform based on microservices within the financial services sector. The role focuses on developing business-critical backend services, contributing to architectural decisions, and improving deployment and engineering practices. Ideal for experienced engineers who combine strong Java expertise with architectural thinking and a proactive approach to system optimization. 🗂️ Requirements: 6–10 years of professional software development experience, Strong expertise in Java backend development, Experience with microservices architecture, Understanding of distributed systems, Experience in system design and software architecture, Ability to work with secure, large-scale systems, Experience improving deployment processes and system reliability 📃 Skills: Java, Microservices, DistributedSystems, SystemDesign, SoftwareArchitecture, REST, Git, Maven, Gradle, Python, Cloud, DevOps 🏢 Description: Senior Java Backend Developer 📍 Location: Wrocław, Poland (Hybrid – 3 days onsite) 📈 Experience: 6–10 years We are currently looking for an experienced Java Backend Developer for our client operating in the financial services sector . The successful candidate will join a team responsible for developing and maintaining a secure, large-scale public platform built on a microservices architecture. This role offers the opportunity to work on business-critical systems where reliability, scalability, and security are key priorities. Beyond feature development, the team is focused on addressing challenges related to architecture, deployment practices, and engineering processes. Therefore, we are looking for someone who combines strong hands-on development skills with architectural thinking and a proactive approach to problem-solving. Key Responsibilities Design and develop new backend features and services using Java Maintain and enhance a secure, customer-facing platform Work within a modern microservices ecosystem Contribute to architectural improvements and technical decision-making Help optimize deployment processes, system reliability, and development workflows Identify technical challenges and propose scalable, long-term solutions What We're Looking For 6–10 years of professional software development experience Strong expertise in Java backend development Solid understanding of microservices architecture and distributed systems Experience with system design and software architecture Strong analytical and critical-thinking skills Ability to understand technical concepts deeply and make informed engineering decisions A proactive mindset and willingness to improve existing systems, processes, and practices Nice to Have Experience with Python Exposure to cloud environments and modern DevOps practices This opportunity is particularly suited to engineers who enjoy working on complex backend systems, influencing architectural decisions, and helping teams improve the way software is designed, built, and deployed.

🏢 Summary: The offer is for a Senior Java Backend Developer to build and evolve a greenfield lending platform as a core component of a larger ecosystem. The role focuses on developing scalable, maintainable backend services using modern Java and Spring technologies, with integrations via REST and Kafka. It involves strong ownership, clean architecture, and Agile collaboration. 🗂️ Requirements: Minimum 8 years of experience with Java backend development, Strong hands-on experience with Java 21+, Minimum 8 years of experience with Spring Boot, Minimum 8 years of experience with JPA, Practical experience with Maven, Experience with Kafka for event-driven integrations, Experience with Liquibase for database versioning, Experience with REST API design and integration, Ability to work in Agile environment, Professional proficiency in English 📃 Skills: Java, Spring, SpringBoot, JPA, Maven, Kafka, Liquibase, REST, Cucumber, GitHubCopilot, SQL 🏢 Description: Our client needs the support of an experienced Java Backend Developer to help build a brand‑new greenfield platform that will act as a central component in the wider lending ecosystem. It is developed in Java 21+ using Spring Boot and JPA, integrates with multiple surrounding systems via REST APIs and Kafka‑based event streaming, and places strong emphasis on clean architecture, scalability, maintainable code, and clear ownership. Liquibase is used for database change versioning, and AI‑assisted tools such as GitHub Copilot support day‑to‑day development. The team works in an Agile setup, closely collaborating with Business SMEs and the Product Owner, with English as the primary working language. Scope of responsibilities Build and evolve a modern backend using Java 21+ and Spring Boot Design and implement integrations with surrounding systems through REST APIs and Kafka event streaming Implement business logic and the persistence layer using JPA, with a strong focus on clean architecture and maintainable code Use Liquibase to handle database change versioning in a controlled and transparent way Leverage AI‑assisted development tools (e.g. GitHub Copilot) to improve productivity, code quality, and development flow Work as part of an Agile team, participating in planning, refinement, reviews, and continuous improvement activities Collaborate closely with Business SMEs and the Product Owner to clarify requirements and co‑design solutions Take active ownership of delivered components, ensuring their reliability, performance, and long‑term maintainability Requirements At least 8 years of experience working with Java, ideally on backend systems Strong hands-on experience with Java 21+ At least 8 years of experience with Spring Boot At least 8 years of experience working with JPA for persistence Practical experience with Maven as a build and dependency management tool Experience using Kafka for event-driven communication and integrations Experience with Liquibase for database change versioning Familiarity with Cucumber or similar tools for automated testing (nice to have) Comfortable working in an Agile team, using English as the primary working language Conditions B2B contract with an hourly rate of 130 - 170 PLN net Hybrid work model: 3 days per week on site Private medical care Life insurance Multisport card Recruitment steps Initial phone call with a recruiter (20–30 min.) Technical verification call with the client Interview with the client Final feedback and decision