(Senior) Fullstack Engineer (Python + React.js) - Freelance

About Our Client:Our client is a leading provider of operational support and expert services for top insurers, brokers, fleet managers, and automotive manufacturers globally. With a team of 3,300 professionals distributed across ten countries, they uphold exceptional standards for over 1,200 clients. Their solutions empower the global insurance sector to manage millions of claims annually in the most efficient and cost-effective manner. As they embark on an ambitious transformation program, their innovative software solutions, leveraging cloud computing and advanced design patterns, are pivotal to this strategy.Role Overview:This is an exciting opportunity for a seasoned Lead Full Stack Engineer to become a vital part of our Software Development team within one of our established Scrum teams. Each agile team comprises roles in technical leadership, development, architecture, QA, product, and project management. We seek a robust engineering leader who merges extensive hands-on development experience with an AI-first approach. This role demands an AI Champion who actively integrates AI tools throughout the Software Development Life Cycle, enhancing engineering productivity, quality, and delivery standards through responsible AI adoption. You will be responsible for developing high-performance applications, including high-traffic customer-facing platforms, while also serving as a catalyst for engineering excellence by introducing modern practices, tools, and methodologies.

About Us:MARGO Group is a leading international IT consulting firm established in 2005 in Paris, with additional offices in London and Warsaw. We excel in IT outsourcing and the provision of highly skilled professionals for intricate technology projects throughout Europe. Our commitment at MARGO is to foster long-lasting partnerships, uphold transparency, and encourage continuous growth and development.

Join our dynamic team at Altersolutions as a Fullstack .NET Angular Developer! In this role, you will have the opportunity to work with cutting-edge technologies and contribute to innovative projects that impact our clients positively. Collaborate with cross-functional teams to design, develop, and implement robust applications that meet business requirements.

VIATechnik is seeking a Mid-Level Fullstack .NET Developer to join its remote team in Poland. This role centers on building solutions for the engineering sector alongside colleagues who value collaboration and growth. Role overview Work with a team of professionals to develop and maintain fullstack applications using .NET technologies. The position involves contributing to projects that support the engineering industry, with opportunities to learn from experienced peers. Collaboration Expect to work closely with other developers and team members in a remote setting. The environment emphasizes teamwork and knowledge sharing, helping you strengthen your technical and communication skills. Location This is a remote position open to candidates based in Poland.

Dołącz do naszego zespołu jako Fullstack Developer (.NET + Angular) i pracuj z wiodącym klientem w branży ubezpieczeniowej. Będziesz odpowiedzialny za projektowanie oraz rozwijanie nowoczesnych aplikacji, które spełniają potrzeby naszych klientów. Jeśli posiadasz doświadczenie w .NET oraz Angular, ta oferta jest dla Ciebie!

Join margo-group as a Fullstack Developer specializing in .NET and Angular, focusing on cloud-native applications. In this role, you will collaborate with cross-functional teams to design, develop, and deploy robust applications that leverage the power of cloud technology. If you are passionate about innovative software solutions and enjoy working in a dynamic environment, we want to hear from you!

At Code & Pepper, we empower clients in industries where mediocrity is not an option. We assist them in scaling teams and developing innovative products.Currently, we are building the Special Procedures Settlement System (RPS) - a platform for the Ministry of Finance that enables electronic monitoring and settlement of customs procedures. This enterprise-level system is developed using .NET 8 / ASP.NET Core, React, and PostgreSQL, and integrates with various external systems.

Waymo is at the forefront of autonomous driving technology, dedicated to becoming the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, Waymo has concentrated on developing the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access and prevent traffic-related fatalities. The Waymo Driver supports Waymo’s fully autonomous ride-hailing service and is adaptable across various vehicle platforms and applications. Having completed over ten million rider-only trips, it has also autonomously navigated more than 100 million miles on public roads and tens of billions in simulated environments across 15+ U.S. states.Are you ready to shape the future of driverless car infrastructure?Join our Waymo Simulation team and contribute to designing the next era of transportation! We are seeking a dedicated Technical Lead Manager with a passion for building systems that enhance Waymo's core simulation technologies.

As a trailblazer in online flash sales since 2001, Veepee stands as a cornerstone in the European e-commerce landscape, partnering with over 7,000 brands to deliver exceptional deals on a wide array of products for a limited time. With a remarkable turnover of 3.3 billion euros incl. VAT in 2024, Veepee boasts a dynamic workforce of 5,000 employees across 10 countries, operating in sectors such as fashion, home, wine, travel, and beauty. JOB DESCRIPTIONWe are excited to invite an experienced Backend/Full Stack Developer to join our innovative Logistics Tooling team at VeepeeTech. This pivotal role involves developing cutting-edge solutions that enhance warehouse operations and optimize the Veepee return process, ensuring an efficient and seamless experience for our customers.

At Capco Poland, we are seeking a dynamic Lead Software Engineer who will be instrumental in driving the development of our strategic risk and Profit and Loss platform for Financial Markets. In this role, you will collaborate with a world-class technology team to craft innovative, scalable, and robust solutions that meet both current and future business demands. Your ability to quickly develop and release solutions will be key in gathering feedback and advising on full-scale rollouts. Join us in shaping the future of financial technology.

Join MARGO as a Senior Fullstack .NET Developer!Are you passionate about technology and looking to make an impact in the field of IT consulting? MARGO, an international leader in IT consulting, is seeking a Senior Fullstack .NET Developer with Angular expertise to join our dynamic team in Warsaw. Established in 2005 in Paris, with additional offices in London and Warsaw, we pride ourselves on providing top-tier IT experts for complex enterprise projects across Europe. At MARGO, we are committed to building long-lasting partnerships, ensuring transparency in our processes, and maintaining technical excellence in everything we do.

Netguru is a pioneering partner in the realm of digital commerce, dedicated to assisting renowned brands in the modernization of B2B solutions, marketplaces, and retail ecosystems. Since 2008, we have empowered businesses through innovative technology, AI-driven personalization, and exceptional engineering and design teams. As a certified B Corporation®, we have built a reputation as a trusted partner for major brands such as IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.Freelancing at Netguru: Your Flexible PathAt Netguru, our freelancers enjoy the liberty to choose their projects, working conditions, and schedules. We align you with opportunities that suit your expertise, allowing you to gain diverse experiences and develop new skills across various industries. Not only can you work on exciting projects, but you can also engage in full-time collaborations, becoming a valued member of our team.Are you ready to leave your mark? Join Netguru, and together we can create remarkable software.We are currently seeking a Senior Fullstack Engineer with proven experience in implementing Instagram Login independently.Compensation: up to 160 PLN/h (on a B2B contract)Engagement Level: Full-timeWorking Hours: CETStart Date: 31.01.2026Project Duration: 2 monthsKey Responsibilities:Overseeing the 'App Review' Process: Managing the complete verification cycle with Meta, including creating necessary screencasts and writing scope justifications to ensure app approval for Live access.Setting Up Meta Ecosystem: Correctly configuring the application environment in the Meta for Developers console, identified as a primary risk area by the client.OAuth Strategy & Implementation: Implementing the 'Login with Instagram' flow to securely retrieve specific influencer data points for profiling.Providing Technical Guidance: Serving as the subject-matter expert to navigate Meta's stringent policies and mitigate application rejection risks.Required Qualifications:Fluency in Polish and English.Experience with OAuth 2.0.Familiarity with Instagram Graph API.Experience with Meta App Review.Preferred Skills:Knowledge of Passport.js / NextAuth.js / OmniAuth (based on tech stack).Understanding of JWT (JSON Web Tokens).Experience with OpenID Connect (OIDC).Familiarity with Facebook Login Kit.Basic knowledge of GDPR compliance.Perks:What We Offer You:100% remote work flexibility.

Role overview fomf seeks a FullStack Engineer to help build and maintain software applications. This remote position is open to candidates based anywhere in Poland. The role covers both front-end and back-end development, with frequent collaboration alongside colleagues from various specialties. What you will do Develop and maintain applications using full stack technologies Work closely with cross-functional teams to deliver reliable software Share ideas to improve user experience and overall product quality Location Remote within Poland.

Join our dynamic team at Collabera as an IT System Engineer specializing in Messaging and .Net Development. In this role, you will harness your technical expertise to enhance our messaging solutions and contribute to innovative projects that drive business success. Collaborate with cross-functional teams to ensure seamless integration and optimal performance of our systems.

Join CaptivateIQ, a pioneering force in transforming sales performance management. We are revolutionizing the way companies plan, manage, and optimize their sales efforts, starting with innovative incentive compensation management and expanding into comprehensive sales planning solutions. Supported by industry leaders such as Sequoia, ICONIQ, Accel, and Sapphire Ventures, we empower dynamic companies like Netflix, Figma, and Stripe with the insights and flexibility they need to enhance revenue performance.As a member of our talented and rapidly growing team, you will tackle some of the most challenging and impactful problems in the realm of sales performance management.About the RoleAt CaptivateIQ, our engineering team is multicultural, collaborative, and fully distributed. We take pride in creating top-tier products driven by cutting-edge technologies. In this role, you will play a crucial part in maintaining the core platform utilized by compensation administrators to design and execute sales compensation models within CaptivateIQ.

Join Our Team as a Senior QA EngineerAre you passionate about quality assurance and automation? Fundraise Up is seeking a Senior QA Engineer (Automation / Fullstack) to enhance our global fundraising platform. You will play a critical role in ensuring that our technology delivers seamless donation experiences for nonprofits worldwide. We prefer candidates who can work during CET hours.About Fundraise UpAt Fundraise Up, we're revolutionizing the way donations are made to nonprofits. Our cutting-edge technology facilitates millions in donations each month, enabling organizations to maximize their impact. Trusted by leading nonprofits such as UNICEF and the Alzheimer’s Association, our platform is designed with accessibility, speed, and innovation at its core.Our EcosystemAs a Senior QA Engineer, you will contribute to a complex product ecosystem that includes customizable widgets, donor and organization portals, admin tools, and various internal applications. Our tech stack features Node.js, MongoDB, Webpack, Vue.js, React, and TypeScript, with advanced messaging capabilities through Kafka and Bull (Redis).A Collaborative EnvironmentOur distributed team of over 120 professionals values collaboration, technical excellence, and knowledge sharing. Join us to be part of a culture that celebrates engineering achievements and emphasizes mentorship.

Role overview Alarm.com is looking for a Software Engineer skilled in C# and .NET to join the team at the EBS Warsaw office. The group focuses on building technology that enhances security and automation for both residential and commercial settings. What you will do Develop and maintain software using C# and .NET frameworks Create and support solutions that enable security and automation features Participate in all phases of the software development lifecycle, from design and coding to testing and deployment Location This role is based onsite in Warsaw, Poland, at the EBS office.

Why Join Housecall Pro?At Housecall Pro, we are on a mission to create solutions that enhance the lives of home service professionals across the United States. Our commitment is to assist these professionals in optimizing their operations, growing their businesses, and ultimately enjoying more time with their families. We believe in the Pro, and every day, we strive to make a significant impact in their lives.Although our headquarters is located in Denver, Colorado, our diverse team stretches across the globe, including talented individuals from Brazil, Poland, the Philippines, Mexico, and more. We prioritize our customers and cultivate a work culture where our company, our team members, and our Pros can thrive together, regardless of their location. Our leadership is deeply invested in the career growth of each team member, expecting them to contribute innovatively to our mission.We also provide:Generous paid holidays and flexible time off policiesA culture that champions innovation and welcomes big ideas from everyoneA MacBook setup ready from day one, plus a $500 stipend to create your ideal workspaceWork hours aligned with Central European Time (CET) for a balanced scheduleEquity in a fast-growing startup supported by leading venture capitalistsAbout the RoleAs a Senior Fullstack Software Engineer, you will leverage your strong engineering fundamentals and problem-solving skills to navigate complex systems effectively. Your focus will be on systems thinking, scalable architecture, and writing clean, maintainable code that provides genuine value to our customers. In this position, you will lead technical decision-making processes, drive projects from conception through to production, and collaborate closely with product, design, and engineering teams to create impactful user experiences.You will play a pivotal role in defining and advocating for technical best practices, enhancing the quality of our systems, and mentoring other engineers as our team expands. Our engineering culture is characterized by passion, empathy, and a collective mission of improving the lives of our service professionals. Your contributions will be vital in enabling their success and fortifying the foundation of our product for years to come.Compensation: $6,500 - $8,000 USD per month (B2B)What You Will Do

Join Box Inc. as a Senior Fullstack Software Engineer and take the next step in your career! We are looking for an experienced engineer who is passionate about building scalable web applications and innovative solutions. In this role, you will work collaboratively with cross-functional teams to design, develop, and maintain high-quality software that meets the needs of our clients.