Backend Engineer

• Design, develop, and maintain RESTful APIs for ReliaSoft Desktop and ReliaSoft Cloud
• Build scalable backend services supporting enterprise integrations and automation
• Develop reusable service architectures for future AI and LLM capabilities
• Collaborate with product management to deliver customer-requested API functionality
• Participate in architecture discussions, code reviews, and Agile development activities
• Ensure software meets quality, security, and performance standards
• Contribute to continuous improvement of development processes and engineering practices
• Deliver expanded API capabilities across the ReliaSoft portfolio
• Deliver enterprise integration solutions and automation capabilities
• Build AI-ready service architecture
• Accelerate delivery of customer-requested APIs

Software Developer building APIs and AI-ready services for HBK’s test-and-measurement software

Software Developer – API, AI/LLM

Software Developer building REST APIs and AI-ready backend services for HBK’s ReliaSoft test-and-measurement software.
Supporting enterprise integrations, automation, and cloud modernization from Poland remotely.

• Build a private cloud solution for a government institution in a Western European country
• Migrate workloads into the new environment
• Provide long-term maintenance and production platform support
• Design, develop, test, and deploy new backend applications
• Test and improve existing backend infrastructure applications
• Meet with architects, functional designers, and specialists on system and application design
• Contribute technical input to scope estimation, pre-sales documents, and client improvement proposals
• Progress toward owning technical decisions, setting solution direction, mentoring engineers, and discussing the engagement's future

Senior Python Developer building and maintaining private cloud solutions at Software Mind

Senior Python Developer

Senior Python Developer building private cloud solutions for global clients at Software Mind. Designing backend applications, migrating workloads, and supporting production platforms.

• Build and continuously improve a sophisticated User Control Panel that encourages user trust and loyalty for continuous recurring growth
• Develop and maintain a high-quality codebase
• Continuously improve code and performance
• Mentor colleagues on web development best practices and provide technical guidance
• Influence the overall vision and long-range goals of the team
• Perform R&D operations when required
• Improve engineering standards, tooling, and processes

Backend Engineer building NordVPN’s User Control Panel and cybersecurity services

Backend Engineer – Mid/Senior

Backend Engineer building NordVPN’s User Control Panel and cybersecurity services.
Developing Go/PHP microservices and improving engineering standards for millions of privacy-focused users.

• Projektowanie, implementacja oraz optymalizacja logiki biznesowej przy użyciu C# i .NET Core
• Rozwój nowoczesnej, dużej aplikacji dla sektora publicznego, z naciskiem na bezpieczeństwo i niezawodność
• Projektowanie i implementacja bezpiecznego REST API
• Stosowanie wzorców projektowych, Clean Architecture i Domain-Driven Design (DDD)
• Praca z relacyjnymi bazami danych, optymalizacja zapytań, tworzenie indeksów i pisanie procedur składowanych
• Implementacja oraz utrzymywanie testów jednostkowych i integracyjnych

Senior C#/.NET Core Developer building secure public-sector software for Code & Pepper

Senior C# / .NET Core Developer

Senior C#/.NET Core Developer building secure, reliable public-sector applications for Code & Pepper. Designing backend logic, APIs, data access, authentication, and automated tests.

• **About ARQ**ARQ is one of the fastest-growing fintechs in the world. Our mission is to redefine how people interact with money across borders, building the infrastructure to move value seamlessly. We’re still early in our journey, which means every person who joins shapes the future of our product, culture, and growth. If you’re excited by big challenges, global impact, and the chance to grow fast with a world-class team, ARQ is the place to do it.
• What we're looking forAs 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.
• 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
• - Demonstrable 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
• Benefits
• - 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

Software Engineer, Java

• 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

Backend Engineer designing and developing systems for fintech startup

Senior Software Engineer, Java

Backend Engineer focusing on developing secure backend systems for fintech products. Collaborating on REST API and microservices using Java technology stack in a hybrid work setup.

Lead Software Engineer developing backend systems for a fintech startup

Lead Software Engineer, Java

Lead Software Engineer developing and maintaining backend systems for a fast-growing fintech startup. Collaborating on innovative solutions that drive financial inclusion.

• Develop and maintain web applications using React and TypeScript.
• Develop complex user interfaces for data-intensive applications.
• Design and implement large interactive tables, filters, and configuration screens.
• Integrate data visualization and mapping solutions into business applications.
• Develop backend services and REST APIs using C# and ASP.NET Core.
• Design and optimize database access layers using Entity Framework.
• Work with Azure SQL and PostgreSQL databases.
• Integrate authentication and authorization solutions using OAuth, JWT, and Okta.
• Implement secure multi-tenant application patterns.
• Collaborate closely with product, data, and platform teams.
• Participate in architectural discussions and technical decisions.
• Use AI-powered development tools to improve productivity and code quality.
• Contribute to the future AI capabilities of the platform.

Fullstack Engineer developing analytics platform for global consulting organization

Fullstack Engineer, C#, .NET, React

Fullstack Engineer focusing on web application development for a large-scale analytics platform. Collaborating in an Agile environment with a distributed team, incorporating AI capabilities.

• Build, refine, and maintain core features across the full stack;
• Develop and optimize both the company's main application and internal Admin Interfaces;
• Implement high-fidelity UI/UX;
• Cooperate closely with Product Managers and Designers;
• Collaborate closely with an additional developer and the QA team;
• Design and maintain significant, sensitive, and secure back-end logic;
• Take responsibility for maintaining and updating the company’s marketing website;
• Leverage AI tools effectively to accelerate the development lifecycle.

Full-Stack Developer building web data access applications for businesses

Full-Stack Developer, Python/Java/React

Full-Stack Developer building and maintaining core web applications for business data access. Collaborating with cross-functional teams to deliver high-performance, pixel-perfect user experiences.

• Design, develop, and maintain backend services for the Aggregation Platform, enabling seamless integrations between game providers and operators.
• Build and enhance API-first solutions that support scalable, high-performance, and business-critical systems.
• Develop secure, maintainable, and high-quality code while following engineering best practices.
• Collaborate with cross-functional teams to design integration solutions and improve platform architecture.
• Contribute to CI/CD pipelines, deployment automation, and overall DevOps practices.
• Participate in architectural discussions and continuously improve platform reliability, scalability, and performance.
• Support Agile development processes and contribute to technical decision-making across the team.

Senior Backend Integration Developer at Software Mind working on gaming systems

Senior Backend Integration Developer, Java

Senior Backend Integration Developer at Software Mind designing backend services for gaming solutions. Collaborating with cross-functional teams to enhance platform integrations and improve DevOps practices.

• Developing and taking ownership of backend services using Java or Kotlin, from architecture design through deployment
• Designing and implementing scalable microservices based on Spring Boot
• Making technical decisions and contributing to backend architecture
• Designing and implementing workflow and process automation solutions using Camunda BPMN
• Modeling and optimizing relational database structures (PostgreSQL/MySQL)
• Building and maintaining CI/CD pipelines using GitHub Actions

Backend Developer for RSB Automotive Consulting building scalable microservices

Backend Developer – Java/Kotlin

Backend Developer for RSB Automotive Consulting focused on scalable microservices using Java/Kotlin. Collaborating on modern software solutions with occasional travel to Germany.

• Implement and configure Drupal-based pages, content structures, templates and reusable components for digital platforms and knowledge portals.
• Translate information architecture, UX designs and content models into practical Drupal structures, including content types, taxonomies, menus, views and publishing patterns.
• Work closely with UX/UI designers, content designers, business analysts and communications specialists to deliver coherent digital user experiences.
• Support editorial workflows, content governance, page publishing and quality assurance in CMS environments.
• Support proposal and solution development by contributing Drupal-related assumptions, role input, implementation considerations and technical clarifications.
• Contribute to multilingual and accessibility-conscious content delivery, including coordination with localisation and QA activities.
• Participate in iterative delivery cycles, including pilot feedback, stakeholder validation and refinement of digital platform components.
• Apply good engineering practices, including Git-based collaboration, configuration management, code review, documentation and release discipline.
• Help strengthen Studio+ positioning in the public institutional ecosystem by contributing to reusable delivery patterns, CMS standards and Drupal capability development.

Lead Drupal Developer for EY Studio+ in EU Institutions, focusing on digital platforms

Lead Drupal Developer

Lead Drupal Developer for EY Studio+, delivering digital platforms for International Public and Private Institutions. Collaborating on Drupal development, user experience, and digital transformations.

• With the support of your team’s tech lead and manager, you will break down larger projects into individual tasks, deliver them in multiple phases, and collaborate with others to ensure timely delivery of your work.
• You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
• You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts.
• You will contribute to a sense of community on your team by engaging in growth and development activities such as participation in the interview process.

Software Engineer II building platforms for collections at Affirm

Software Engineer II, Backend – Collections

Software Engineer II building next-gen backend solutions for collections at fintech company Affirm. Collaborating with teams to maximize recovery of delinquent users and maintain system reliability.

• Maintain core system components and drive optimization tasks focused on performance and speed
• Work closely with logging, monitoring, and telemetry features, improving error handling and system visibility
• Develop software mainly using Golang and C, while maintaining and gradually replacing legacy Bash scripts
• Create automated tests using Python to cover regressions and bridge coverage gaps
• Investigate complex bugs, track system calls, and analyze multithreaded dependencies in a codebase
• Take part in technical discussions with the team to define how to best implement requirements

Golang Software Engineer developing software for monitoring enterprise router systems

Golang Software Engineer, Python/C

Golang Software Engineer developing software for monitoring enterprise router systems at CodiLime. Collaborating on optimization tasks and creating automated tests with a focus on performance.

C Software Engineer developing solutions for enterprise router software in a remote environment

C Software Engineer, Python

C Software Engineer responsible for maintaining and optimizing enterprise router software. Collaborating with a passionate team remotely in Poland and focused on engineering skill development.

• Design, develop and maintain complex, business-critical application and system components, Kotlin
• Take end-to-end ownership of solutions, from requirements analysis to implementation and production support
• Investigate and resolve incidents and problems, including root-cause analysis
• Support technical design decisions with focus on scalability, performance, security and maintainability
• Review code and architecture to ensure quality, consistency and best practice standards
• Identify technical debt, risks and improvement opportunities, and actively drive continuous improvement
• Collaborate with product owners, business analysts, QA, operations and other IT teams
• Mentor and support junior developers through coaching, code reviews and knowledge sharing
• Contribute to technical documentation, knowledge bases and operational runbooks

IT Senior Developer responsible for developing and enhancing applications at DSV

Senior IT Developer, Kotlin

IT Senior Developer responsible for applications development and enhancement in a logistics leader company. Collaborating with various teams and mentoring junior developers while ensuring system reliability.

• Develop and maintain scalable backend services using Python and Django
• Build and extend content management capabilities with Wagtail CMS
• Design and implement GraphQL APIs to power modern frontend applications
• Develop responsive, performant frontend components using React and Next.js
• Collaborate with product, design, and engineering teams to translate business requirements into technical solutions
• Ensure high code quality through code reviews, testing, and adherence to best practices
• Contribute to the product roadmap by providing technical insights and delivery estimates
• Support continuous improvement of development workflows and DevOps practices

Full-stack Developer role for a UK-based client in investment services

Full-stack Developer, Python, Django

Full-stack Developer role developing a web portal for a UK-based client in the investment sector. Involving collaboration and key development support using Python, Django, React, Next.js.

• Dołączenie do zespołu pracującego nad Aras Innovator jako .NET Full-Stack Developer
• Tworzenie aplikacji dla złożonych potrzeb przedsiębiorstw na platformie niskokodowej
• Współpraca z innymi członkami zespołu nad dostosowywaniem produktu do potrzeb klientów

.NET Full-Stack Developer creating enterprise applications for Aras Innovator

Net Full-Stack Developer

.NET Full-Stack Developer for Aras Innovator, a low-code platform for enterprise applications. Collaborate with teams to create customized solutions.

• Work on tasks that contribute to the team's projects and goals
• Collaborate with your team and stakeholders to create visibility and dialog regarding work risks and trade-offs
• Ensure speed and quality in your work to hit business goals while protecting from downtime
• Engage in growth and development activities to build a sense of community

Software Engineer I, Backend (Collections) developing credit solutions at Affirm

Software Engineer I, Backend – Collections

Software Engineer I, Backend (Collections) developing robust platform solutions for credit management at Affirm. Collaborating on projects to enhance the reliability of engineering systems.

• Join Platform Security Solutions organisation at Technology Platform Engineering & Operations division
• Bolster Self-Service, Scanning and Platform Integrations function
• Maintain and expand existing, as well as develop new products from scratch and operationalize them at enterprise scale
• Work with multiple internally developed distributed systems, portals and data warehouses
• Shape the future of cybersecurity and IT solutions

Senior Software Engineer developing cybersecurity solutions for a major bank

Senior Security Software Engineer – .NET, Assistant Vice President

Senior Software Engineer developing cybersecurity and IT solutions for banking, leveraging .NET and Azure technologies. Focused on maintaining and innovating platform security solutions.

Backend Engineer jobs in Poland

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