April 11, 2026

FullStack .Net Developer (React)

Senior • Remote

18,000 - 25,000 PLN/mo

Warsaw, MZ, Poland

About Optiveum and our Client

Optiveum is a boutique talent advisory firm. We help our clients build high-performance technology teams that move the needle.

We are currently looking for a Senior FullStack .NET Developer for our client—a fast-growing US-based leader in the Financial Technology sector. With a major engineering hub in Warsaw, they are blending American innovation and "move-fast" culture with top-tier Polish engineering talent. You’ll be joining an environment that skips the bureaucracy in favor of high ownership, architectural excellence, and a product-first mindset.

The Role

As a Senior FullStack Engineer, you aren’t just executing tickets; you are a product builder. You will bridge the gap between robust, high-scale backend services and modern, highly interactive user interfaces. This role is perfect for someone who thrives in a fast-paced US tech culture, enjoys solving complex distributed systems puzzles, and cares deeply about delivering a world-class User Experience (UX).

Your Responsibilities

  • Full-Scale Development: Own features end-to-end, from database schema and API design to the final React component.

  • Architecture & Scale: Contribute to the evolution of a Cloud-Native microservices architecture on Azure, designed to handle global traffic.

  • Engineering Excellence: Maintain high standards (SOLID, Clean Code, Design Patterns) while maintaining the velocity needed for a competitive US market.

  • Frontend Leadership: Drive the development of responsive, high-performance web applications using React.

  • Global Collaboration: Partner closely with US-based Product Managers and Stakeholders to translate vision into scalable technical reality.

  • Mentorship: Lead by example through Code Reviews and knowledge sharing, helping elevate the Warsaw engineering hub.

Requirements

  • Backend Expertise: 5+ years of experience in .NET (.NET 6/8+) and C#. Expertise in building RESTful APIs and event-driven architectures.

  • Frontend Mastery: Solid experience with React and TypeScript. Familiarity with state management (Redux, Zustand, or React Query).

  • Cloud-Native Mindset: Practical experience with Azure (App Services, Functions, Service Bus, Cosmos DB/SQL).

  • Database Knowledge: Strong skills in SQL Server and Entity Framework Core.

  • Modern DevOps: Hands-on experience with Docker, Kubernetes, and CI/CD pipelines (Azure DevOps/GitHub Actions).

  • Language: Good English

Nice to Have

  • Experience in high-growth FinTech, WealthTech, or high-frequency trading environments.

  • Knowledge of testing frameworks (xUnit, Jest/Cypress).

  • Familiarity with Web Performance optimization and Accessibility (WCAG).

What We Offer

  • US Tech Culture: A transparent, high-growth environment that values "radical candor," innovation, and taking initiative.

  • Professional Growth: Access to the latest tech—we operate on the "bleeding edge" of .NET and React.

  • Modern Warsaw Office: A vibrant, well-located hub for collaboration, combined with a flexible hybrid/remote policy.

  • Competitive Compensation: 18.000 - 25000 PLN B2B

  • Global Scale: Your code will power mission-critical systems used by financial professionals and institutions across the US and globally.

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🏢 Summary: Senior .NET Full-Stack Engineer role focused on building and supporting scalable enterprise applications using Microsoft 365, cloud platforms, and modern web technologies. The position involves developing SharePoint Online, SPFx, React, .NET, and Power Platform solutions, as well as Azure and AWS-hosted applications. It offers the opportunity to work on internal enterprise systems in an Agile environment with strong emphasis on secure, modern development practices. 🗂️ Requirements: 3+ years of full-stack engineering experience, Experience with SharePoint Online, Proficiency in C#, Proficiency in .NET, Experience with SPFx, Experience with React, Experience with PowerShell scripting, Experience with Microsoft Power Platform (Power Apps, Power Automate, Power BI, Dataflows), Experience developing Azure applications and web services, Experience supporting AWS-hosted applications, Experience in enterprise application development and integration, Understanding of secure application development practices, Ability to troubleshoot complex technical issues, Experience working in Agile environments, Upper-Intermediate (B2) English or higher 📃 Skills: C#, .NET, SharePoint, SPFx, React, PowerShell, PowerApps, PowerAutomate, PowerBI, Dataflows, Azure, AWS, API, SFTP, SQL, Jira, EntraID, EKS 🏢 Description: We are seeking a highly skilled Senior .NET Full-Stack Engineer to join the Enterprise Applications team responsible for developing, enhancing, and supporting multiple internal business applications and platforms. This role will focus on delivering scalable, secure, and modern enterprise solutions using Microsoft 365 technologies, cloud services, and modern application development frameworks. The ideal candidate will have strong hands-on engineering experience, excellent problem-solving abilities, and the capability to collaborate effectively with business and technology stakeholders across multiple initiatives. Responsibilities Design, develop, enhance, and support enterprise applications and integrations Build modern solutions leveraging SharePoint Online, SPFx, React, .NET, and Power Platform technologies Develop and maintain APIs, automation workflows, and cloud-hosted applications Collaborate with business stakeholders, product owners, architects, and engineering teams to gather and refine requirements Support multiple internal applications across various business functions Develop Power Platform solutions, including Power Apps, Power Automate, Power BI, and Dataflows Create and maintain scripts and automation processes using PowerShell Build and support Azure applications, web services, and AWS-hosted solutions Participate in application troubleshooting, root-cause analysis, and production support activities Contribute to technical design discussions, code reviews, and engineering best practices Support Agile delivery processes, including sprint planning, backlog grooming, and estimation activities Maintain technical documentation and operational procedures Requirements 3+ years of experience in full-stack engineering and enterprise application development Strong experience with SharePoint Online Proficiency in C# and .NET Hands-on experience with SPFx and React Skills in PowerShell scripting and automation Background in Microsoft Power Platform, including Power Automate, Power Apps, and Power BI, as well as Dataflows Hands-on experience developing Azure applications and web services, plus supporting applications hosted in AWS Showcase of strong application development and integration experience across enterprise-scale internal applications Understanding of secure application development practices Ability to troubleshoot and resolve complex technical issues Familiarity with collaborative Agile environments Proficiency in English at an Upper-Intermediate level (B2) or higher Nice to have Familiarity with the Microsoft 365 application ecosystem and Azure Entra ID Knowledge of API development, SFTP integration, and file transfer solutions Exposure to AWS EKS environments Competency in analytical thinking, business engagement, and Agile methodology using Jira Basic understanding of databases and SQL We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

Technology

EPAM Systems

Senior .NET Full-Stack Engineer with SPFx

Senior

Remote

Katowice, SL, Poland

🏢 Summary: Senior .NET Full-Stack Engineer role focused on developing and supporting scalable enterprise applications using Microsoft 365, SharePoint Online, Power Platform, and cloud technologies. The position involves building modern full-stack solutions, APIs, automation workflows, and cloud-hosted services across Azure and AWS environments. Candidates will collaborate in Agile teams to deliver secure, integrated internal business applications. 🗂️ Requirements: 3+ years of full-stack engineering and enterprise application development experience, Strong experience with SharePoint Online, Proficiency in C# and .NET, Hands-on experience with SPFx and React, Experience with PowerShell scripting and automation, Experience with Microsoft Power Platform (Power Apps, Power Automate, Power BI, Dataflows), Hands-on experience developing Azure applications and web services, Experience supporting applications hosted in AWS, Understanding of secure application development practices, Ability to troubleshoot complex technical issues, Experience working in Agile environments, English proficiency at B2 level or higher 📃 Skills: C#, .NET, SharePoint, SPFx, React, PowerShell, PowerApps, PowerAutomate, PowerBI, Dataflows, Azure, AWS, APIs, SFTP, SQL, Jira, AzureEntraID 🏢 Description: We are seeking a highly skilled Senior .NET Full-Stack Engineer to join the Enterprise Applications team responsible for developing, enhancing, and supporting multiple internal business applications and platforms. This role will focus on delivering scalable, secure, and modern enterprise solutions using Microsoft 365 technologies, cloud services, and modern application development frameworks. The ideal candidate will have strong hands-on engineering experience, excellent problem-solving abilities, and the capability to collaborate effectively with business and technology stakeholders across multiple initiatives. Responsibilities Design, develop, enhance, and support enterprise applications and integrations Build modern solutions leveraging SharePoint Online, SPFx, React, .NET, and Power Platform technologies Develop and maintain APIs, automation workflows, and cloud-hosted applications Collaborate with business stakeholders, product owners, architects, and engineering teams to gather and refine requirements Support multiple internal applications across various business functions Develop Power Platform solutions, including Power Apps, Power Automate, Power BI, and Dataflows Create and maintain scripts and automation processes using PowerShell Build and support Azure applications, web services, and AWS-hosted solutions Participate in application troubleshooting, root-cause analysis, and production support activities Contribute to technical design discussions, code reviews, and engineering best practices Support Agile delivery processes, including sprint planning, backlog grooming, and estimation activities Maintain technical documentation and operational procedures Requirements 3+ years of experience in full-stack engineering and enterprise application development Strong experience with SharePoint Online Proficiency in C# and .NET Hands-on experience with SPFx and React Skills in PowerShell scripting and automation Background in Microsoft Power Platform, including Power Automate, Power Apps, and Power BI, as well as Dataflows Hands-on experience developing Azure applications and web services, plus supporting applications hosted in AWS Showcase of strong application development and integration experience across enterprise-scale internal applications Understanding of secure application development practices Ability to troubleshoot and resolve complex technical issues Familiarity with collaborative Agile environments Proficiency in English at an Upper-Intermediate level (B2) or higher Nice to have Familiarity with the Microsoft 365 application ecosystem and Azure Entra ID Knowledge of API development, SFTP integration, and file transfer solutions Exposure to AWS EKS environments Competency in analytical thinking, business engagement, and Agile methodology using Jira Basic understanding of databases and SQL We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

Technology

EPAM Systems

Senior .NET Full-Stack Engineer with SPFx

Senior

Remote

Gdansk, Poland

🏢 Summary: Senior .NET Full-Stack Engineer role focused on developing and supporting scalable enterprise applications using Microsoft 365, SharePoint Online, Power Platform, and cloud technologies. The position involves building modern full-stack solutions, APIs, automation workflows, and cloud-hosted applications across Azure and AWS environments. The engineer will collaborate in Agile teams to deliver secure, high-quality internal business platforms. 🗂️ Requirements: 3+ years of full-stack engineering experience, Experience in enterprise application development, Strong experience with SharePoint Online, Proficiency in C# and .NET, Hands-on experience with SPFx and React, Experience with PowerShell scripting and automation, Experience with Microsoft Power Platform (Power Apps, Power Automate, Power BI, Dataflows), Experience developing Azure applications and web services, Experience supporting AWS-hosted applications, Knowledge of secure application development practices, Ability to troubleshoot complex technical issues, Experience working in Agile environments, Upper-Intermediate (B2) or higher English proficiency 📃 Skills: C#, .NET, SharePoint, SPFx, React, PowerShell, PowerApps, PowerAutomate, PowerBI, Dataflows, Azure, AWS, APIs, SFTP, SQL, Jira 🏢 Description: We are seeking a highly skilled Senior .NET Full-Stack Engineer to join the Enterprise Applications team responsible for developing, enhancing, and supporting multiple internal business applications and platforms. This role will focus on delivering scalable, secure, and modern enterprise solutions using Microsoft 365 technologies, cloud services, and modern application development frameworks. The ideal candidate will have strong hands-on engineering experience, excellent problem-solving abilities, and the capability to collaborate effectively with business and technology stakeholders across multiple initiatives. Responsibilities Design, develop, enhance, and support enterprise applications and integrations Build modern solutions leveraging SharePoint Online, SPFx, React, .NET, and Power Platform technologies Develop and maintain APIs, automation workflows, and cloud-hosted applications Collaborate with business stakeholders, product owners, architects, and engineering teams to gather and refine requirements Support multiple internal applications across various business functions Develop Power Platform solutions, including Power Apps, Power Automate, Power BI, and Dataflows Create and maintain scripts and automation processes using PowerShell Build and support Azure applications, web services, and AWS-hosted solutions Participate in application troubleshooting, root-cause analysis, and production support activities Contribute to technical design discussions, code reviews, and engineering best practices Support Agile delivery processes, including sprint planning, backlog grooming, and estimation activities Maintain technical documentation and operational procedures Requirements 3+ years of experience in full-stack engineering and enterprise application development Strong experience with SharePoint Online Proficiency in C# and .NET Hands-on experience with SPFx and React Skills in PowerShell scripting and automation Background in Microsoft Power Platform, including Power Automate, Power Apps, and Power BI, as well as Dataflows Hands-on experience developing Azure applications and web services, plus supporting applications hosted in AWS Showcase of strong application development and integration experience across enterprise-scale internal applications Understanding of secure application development practices Ability to troubleshoot and resolve complex technical issues Familiarity with collaborative Agile environments Proficiency in English at an Upper-Intermediate level (B2) or higher Nice to have Familiarity with the Microsoft 365 application ecosystem and Azure Entra ID Knowledge of API development, SFTP integration, and file transfer solutions Exposure to AWS EKS environments Competency in analytical thinking, business engagement, and Agile methodology using Jira Basic understanding of databases and SQL We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

Technology

MOTIFE

Senior Full-Stack Engineer (.NET & React)

Senior

Hybrid

Warsaw, Poland

23,000 - 28,000 PLN/mo

🏢 Summary: Senior Full-Stack Engineer role focused on designing and building scalable APIs and microservices that power music-related experiences across a global fitness platform. The position combines backend development in .NET with frontend collaboration in React/Vue, working on distributed systems and real-time features. It involves strong ownership, architectural influence, and delivering high-impact user-facing solutions at scale. 🗂️ Requirements: 5+ years of professional software development experience, Strong knowledge of C#, Strong knowledge of .NET ecosystem, Experience building and maintaining RESTful APIs, Understanding of asynchronous programming, Experience with multithreading, Experience with NoSQL databases, Experience with MongoDB, Familiarity with microservices architecture, Working knowledge of React or Vue.js, Experience with CI/CD pipelines, Experience with automated testing, Understanding of DevOps principles, Understanding of Agile methodologies, Strong focus on code quality and scalability, Professional English communication skills 📃 Skills: C#, .NET, REST, React, Vue, MongoDB, AWS, S3, SQS, Lambda, Microservices, CI/CD, Docker, Kubernetes, RabbitMQ, NServiceBus 🏢 Description: We are hiring on behalf of our client, a global innovator in fitness and wellness technology. Their mission is to empower people to live fit, strong, long, and happy lives by delivering integrated experiences to millions of members anytime, anywhere. We are looking for a Senior Full-Stack Engineer (.NET & React) to join the Content Platform team, focused on building systems that power music-related experiences across the product ecosystem. In this role, you will design and develop APIs and backend services that support everything from instructor class planning to real-time music playback during workouts. This is a hands-on engineering role with strong ownership, where you will work on distributed systems, collaborate across teams, and directly impact user-facing features at scale. Key takeaways: Stack : C#, .NET, REST APIs, React/Vue, MongoDB, AWS (S3, SQS, Lambda), microservices Salary : 23 000 PLN - 28 000 PLN gross on the Contract of Employment Working model : Hybrid - 3 days/week from the office Location : ul. Grzybowska 60, Warsaw Recruitment process : A call with MOTIFE Recruiter Panel interviews with the team (coding, architecture, and cross-collaboration interviews, Hiring Manager meeting) Responsibilities: Backend Development & Architecture Design, build, and maintain scalable APIs and microservices supporting content and music-related features Develop systems for managing music catalogs, class planning tools, and platform integrations Ensure high performance, reliability, and scalability of backend services Technical Excellence Write clean, maintainable, and well-tested code with a focus on long-term sustainability Drive best engineering practices, including CI/CD, automated testing, logging, and monitoring Continuously improve system architecture while avoiding unnecessary complexity Collaboration & Delivery Partner closely with Product, Design, and QA to deliver high-quality features Actively participate in architecture discussions, code reviews, and technical planning Translate UI/UX requirements into reliable backend solutions Engineering Culture Contribute to a culture of code quality, ownership, and continuous improvement Promote practices such as refactoring, pair programming, and iterative development Support knowledge sharing and help evolve engineering standards across the team Requirements: Technical Expertise 5+ years of professional software development experience Strong knowledge of C# and .NET ecosystem Experience building and maintaining RESTful APIs Solid understanding of asynchronous programming and multi-threading Experience with NoSQL databases (e.g., MongoDB) Familiarity with microservices architecture Frontend & Platform Awareness Working knowledge of React, Vue.js, or similar frontend frameworks Understanding of system integration and API-driven development Engineering Practices Experience with CI/CD pipelines, automated testing, and DevOps principles Understanding of Agile and Lean development methodologies Strong focus on code quality, maintainability, and scalability Collaboration & Mindset Strong communication skills in English Ability to work effectively in cross-functional teams Comfortable working in fast-paced, evolving environments Nice to Have Experience with Docker and Kubernetes Familiarity with AWS services (S3, SQS, Lambda) Experience with messaging systems (e.g., NServiceBus, RabbitMQ) What we offer: 100% paid medical care Multisport Creative tax (KUP) Home office allowance MacBook Pro