Lead .NET Fullstack Engineer

At Affirm, we're revolutionizing credit to enhance transparency and accessibility, empowering consumers to buy now and pay later without hidden fees or compounding interest.Be part of our innovative Servicing International team, pivotal to Affirm's global expansion, as we develop the core platform to introduce our offerings to a new era of international markets. This position will concentrate on purchase protection, including disputes and refunds—a vital component of the user journey and an area of substantial investment—to foster trust and satisfaction among our newest customers. Success in this role demands close collaboration; you will work alongside our European engineering teams and engineers from our global Servicing Engineering organization to create cohesive, scalable solutions. If you are driven by a passion for crafting exceptional user experiences and are excited about the prospect of launching products in new regions, we invite you to join us. Help shape the future of Affirm's platform and establish our global presence.Key ResponsibilitiesLead your team in achieving quarterly objectives, guiding engineers through ambiguity to address open-ended challenges while ensuring continuous support throughout the delivery process.Collaborate with peers and stakeholders in the product development lifecycle, engaging with product management, design, and analytics to participate in ideation and articulate technical constraints, while making decisions that appropriately weigh risks and trade-offs.Proactively identify and advocate for solutions to project, process, technology, or business issues.Monitor and support the operations and availability of your team's deliverables by establishing metrics, escalating issues when necessary, and contributing to ongoing maintenance and on-call responsibilities.Promote a culture of quality and ownership within your team by enhancing code review and design standards and advocating for best practices through documentation and technical presentations.Mentor and develop team talent by providing feedback, guidance, and leading by example.QualificationsMinimum of 4 years of experience as a software engineer.Proficient in designing, developing, and deploying backend systems at scale using technologies such as Python, Kotlin, AWS, MySQL, and Kubernetes.Experienced in delivering web applications with declarative UI frameworks like React or Vue.Skilled in defining a technical blueprint for significant feature or system component delivery with an emphasis on elegant, simple, and extensible design.

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 our dynamic team at Inetum2 as a Senior Fullstack Software Engineer, where you'll be at the forefront of developing innovative software solutions. In this role, you will leverage your expertise in both frontend and backend technologies to build scalable applications that enhance user experience. Collaborate with cross-functional teams to design, develop, and maintain high-quality software products.

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.

Addepar is looking for a Senior Fullstack Software Engineer in Poland to focus on Portfolio Data Workflows. This position centers on designing and building solutions that strengthen portfolio management features for clients. Role overview This role involves developing and implementing software that improves how portfolio data is managed and processed. Working closely with cross-functional teams, you will help deliver reliable and effective tools that support client needs. Collaboration Expect to work alongside engineers, product managers, and other stakeholders to ensure software quality and alignment with business goals. Communication and teamwork are key parts of the day-to-day work. What you will do Design and implement solutions for portfolio data workflows Enhance portfolio management capabilities through fullstack development Collaborate with various teams to deliver high-quality software

Join Turnitin as a Senior Fullstack/Backend Software Engineer, where your expertise in backend development, particularly with Java and serverless architectures, will be pivotal. We are seeking engineers who are enthusiastic about creating scalable distributed systems and delivering robust software solutions for our acclaimed educational platform.As an integral member of our shared services team, you'll spearhead the development and enhancement of the core systems supporting both our existing and upcoming applications.Key Responsibilities:Architect, develop, and optimize scalable backend services utilizing Java and serverless technologies (AWS Lambda).Design and implement RESTful APIs and event-driven architectures.Contribute to frontend component development as required.Enhance performance and cost-effectiveness of existing services.Collaborate with cross-functional teams, including Architects, Product Managers, and engineering leads, to deliver innovative solutions.Mentor junior developers and promote best practices.Establish and manage CI/CD pipelines.Maintain high-quality coding standards through peer reviews, automated testing, and compliance with development best practices.Document shared components comprehensively, providing usage guidelines and examples.

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 innovative team at Aurora Solar as a Senior Software Engineer. In this role, you will help drive our mission to revolutionize solar energy solutions on a global scale. Your expertise will contribute to developing cutting-edge software that empowers solar professionals and enhances efficiency in solar project management.As a key player in our engineering team, you will work collaboratively with cross-functional teams to design, implement, and optimize software solutions that meet the needs of our international clientele. Your contributions will directly impact the future of renewable energy technology.

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.

Join the Innovative Team at SienaAt Siena, we are pioneering the first intelligence layer for customer experience. Our vision is to create an operating system of AI agents that seamlessly learn, remember, and act across all customer touchpoints—from support interactions to shopping experiences, including voice and social media.Siena goes beyond mere automation; we empower shopping agents, foster persistent customer memory, deliver actionable business insights, and cultivate empathetic interactions that resonate with users.We are redefining how businesses comprehend and engage with their customers, transforming every interaction into a learning opportunity for future enhancements.About Our TeamOur small, distributed team is committed to making a significant impact. Each member plays a vital role, as we emphasize efficiency and creativity in our work, making collaboration both swift and enjoyable.If you’re passionate about creating groundbreaking products, this is your chance. We are developing agents that do more than just respond to inquiries; they remember customers, learn from each engagement, and unify experiences across channels.Your RoleAs a Fullstack Software Engineer at Siena, you will manage projects from inception to completion, enhancing and optimizing features within our AI-driven customer support automation platform. Collaborating closely with the product team, you will help shape our development roadmap while constructing reliable, high-performance systems. Your contributions will facilitate millions of customer interactions with global brands, where your work's reliability and speed will directly influence business success. If you enjoy tackling real-world challenges, excel in dynamic environments, and take pride in delivering exceptional products, this role is perfect for you.Your ResponsibilitiesDesign, develop, and maintain scalable features across the entire tech stack (frontend, backend, and infrastructure).Collaborate with Product to break down project scopes into iterative, impactful releases.Integrate advanced LLM capabilities into real-world enterprise workflows.Work on an AI-first product, embedding cutting-edge LLM capabilities into customer support frameworks.Address complex engineering challenges, optimizing API performance and refining microservices architecture.Enhance and maintain our cloud infrastructure (AWS) with a DevOps mindset.Exhibit high levels of agency and ownership—taking initiative, making decisions, and propelling ideas to production.

Addepar is looking for a Senior Software Engineer to join the Portfolio Services team in Poland. This position centers on designing and building solutions that help clients manage their investment portfolios. Role overview This role involves contributing to the development and improvement of software systems that support portfolio management. The work includes collaborating with colleagues from different teams to refine system architecture and boost performance. What you will do Design and implement software features for portfolio services Work with cross-functional teams to enhance system architecture Focus on delivering high-quality, scalable solutions Requirements Experience in software development Ability to collaborate with diverse teams Commitment to quality and scalable systems

Addepar is seeking a Senior Software Engineer to focus on Platform Services. This position centers on designing, building, and maintaining software systems that strengthen the platform's core features. Role overview As a Senior Software Engineer, the main responsibility is to improve and expand Addepar’s platform services. The role involves working with other teams across the company to ensure that solutions align with client needs and support ongoing growth. What you will do Design and implement software systems that support the platform’s capabilities Maintain and improve existing services to ensure reliability and performance Collaborate with cross-functional teams to deliver solutions for evolving client requirements Location This role is based in Poland.

About Our Client Our client is a pioneering force in the realm of digital identity and fraud prevention, providing a state-of-the-art platform utilized by banks, fintech firms, online marketplaces, and various regulated entities globally. Their innovative solutions encompass biometric identity verification, document and image processing, and sophisticated fraud detection mechanisms, enabling customers to achieve seamless digital interactions while maintaining rigorous security and compliance with regulations. Leveraging cutting-edge technologies such as AI, machine learning, and computer vision, they facilitate identity verification, mobile deposits, and liveness detection, catering to thousands of organizations worldwide. About the Role We are in search of a Senior Full Stack Engineer who possesses a robust proficiency in backend services built with Go and modern web front-end frameworks. As a member of a dynamic cross-functional team, you will contribute to the development of cloud-native identity and fraud prevention products hosted on AWS. Your role will encompass designing and implementing APIs in Go, as well as crafting user-centric features using contemporary JavaScript frameworks, ensuring secure, high-performance experiences for both internal and external users. Key Responsibilities Design, develop, and maintain backend services and APIs in Go, leveraging AWS infrastructure with microservice or serverless architectures. Create responsive single-page and web applications utilizing React and Redux, seamlessly integrating them with backend APIs. Implement clean and reusable UI components, prioritizing user experience, performance, and accessibility. Develop and uphold automated testing protocols for both backend and frontend components, contributing to CI/CD automation processes. Collaborate closely with designers, product managers, QA, and fellow engineers to refine requirements and deliver comprehensive features. Engage in technical design and architecture discussions, aiding in the definition of interfaces between services and front-end applications. Contribute to the documentation of APIs, front-end components, and significant technical decisions. Participate in Agile ceremonies and proactively drive enhancements in team processes and engineering practices.

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.

Join Netguru, a leading partner in digital commerce, as we empower top-tier brands to innovate their B2B solutions, marketplaces, and retail ecosystems. Since our inception in 2008, we have been at the forefront of technology, harnessing AI-driven personalization and delivering excellence through our engineering and design teams. As a certified B Corporation®, we are proud to partner with renowned brands such as IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.We are currently seeking a talented Fullstack Engineer to collaborate with our client, a global online platform that connects users with local restaurants, grocery stores, and retailers for seamless on-demand delivery services.

Join Lumilens as a Senior Software Engineer and be part of an innovative team dedicated to transforming the optical technology landscape. You will be responsible for designing, developing, and maintaining software solutions that enhance our product offerings. Your expertise will help drive our mission to deliver high-quality optical products to our customers.

Join our innovative team at inetum2 as a Senior C++ Software Engineer, where you will play a pivotal role in developing cutting-edge software solutions. This is an exciting opportunity for skilled engineers to work in a dynamic environment that fosters creativity and collaboration.

Join our dynamic team at evooq as a Senior Software Engineer! In this role, you will leverage your extensive experience in software development to design, implement, and maintain high-quality software solutions that meet our client’s needs. You will collaborate closely with cross-functional teams, contributing to all stages of the development lifecycle. If you are passionate about technology and eager to make a significant impact, we want to hear from you!

NFQ serves as a pivotal technology partner for HomeToGo, where a passionate team of software engineers and data science experts spearheads the innovation that fuels a marketplace showcasing the world’s largest selection of vacation rentals. As we expand HomeToGo’s tech team in Lithuania, we are on the lookout for top-tier talent to join our dynamic organization.HomeToGo, the premier marketplace for vacation rentals, boasts millions of listings from trusted partners like Booking.com, Vrbo, and TripAdvisor. Whether you’re searching for vacation homes, cabins, beach houses, apartments, condos, houseboats, castles, or farm stays, HomeToGo seamlessly integrates pricing, destination, dates, and amenities to help travelers find their ideal accommodation for any journey around the globe.Established in 2014, HomeToGo operates localized applications and websites in 25 countries across Europe, North America, South America, Australia, and Asia-Pacific. The company's portfolio also includes recognizable brands such as Agriturismo.it, AMIVAC, Casamundo, CaseVacanza.it, e-domizil, EscapadaRural, Tripping.com, and Wimdu.We are seeking a Senior Software Engineer (PHP) to join our Distribution Team, responsible for developing systems that connect HomeToGo with a multitude of partners—from individual agents to major industry players like Google, TUI, and Amadeus. In this role, you'll design and maintain diverse channels that fuel our growth, integrating our B2B tools and public channels into a cohesive, high-performance ecosystem that distributes millions of vacation rentals worldwide. You will collaborate with a team of PHP and React (TypeScript) Software Engineers focused on delivering self-service software projects with a strong emphasis on data quality. Our engineers engage throughout the entire software lifecycle and work with a wide array of technologies. Moreover, you will be part of a supportive team of intelligent, dedicated, and driven individuals who make the workplace enjoyable.