Senior Backend Engineer - Plans Squad (f/m/x)

Job Overview Join Our Team We are seeking an experienced Senior Backend Engineer (Go) to join Inflect as a contractor within our Engineering team in Poland. This role offers you the opportunity to take significant technical ownership of essential backend services in a hands-on, execution-driven capacity. If you have a passion for building, scaling, and enhancing production systems that drive business success, we'd love to hear from you! This position is ideal for a senior engineer at either a senior or early staff level, showcasing strong technical ownership and a high degree of autonomy. As part of our tight-knit, senior engineering team, you will enjoy substantial ownership and autonomy, making a direct impact on our product. You will have a concrete influence over backend architecture, technical direction, and tooling decisions while maintaining alignment with product and business objectives. This position does not include people management responsibilities or legacy system ownership; it is solely focused on developing, scaling, and enhancing modern backend services. About Inflect Inflect is at the forefront of building and operating an innovative IT infrastructure marketplace, seamlessly connecting buyers and service providers through a single, product-driven platform. We are not just a software house or agency. We navigate complex marketplace workflows at the intersection of cloud infrastructure, network services, and large-scale computing (CPU/GPU). Our marketplace integrates directly with service providers, allowing buyers to discover, compare, and transact infrastructure services effortlessly. Our engineering culture prioritizes pragmatism, ownership, and rapid feedback, focusing on delivering tangible business value rather than adhering to rigid processes or excessive formalities. Work Environment Standard working hours align with the Polish (CET) time zone, with regular collaboration with engineers and stakeholders based in the United States. We prefer a hybrid work model, with 1–2 days in our Warsaw office each week. Daily communication in English with US-based engineers and partners. Close collaboration with Product, Backend, and Infrastructure-focused teammates. Your Responsibilities Assume technical ownership of critical backend services that power Inflect’s marketplace and service provider integrations. Design, implement, and scale backend systems that support the onboarding and integration of new service provider groups. Collaborate closely with Product and Engineering leadership to translate marketplace and integration requirements into practical, production-ready technical solutions. Engage in ongoing evaluation and improvement of backend systems to enhance performance and reliability.

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 Saily, where we simplify staying connected while traveling — no roaming fees, no plastic SIM cards, just high-speed, secure mobile data accessible in over 200 destinations. With millions of satisfied customers and countless travelers using Saily at any time, we are dedicated to enhancing their experience.At Saily, we cultivate an AI-driven Product Engineering culture that empowers our engineers to:Own the product development lifecycle from concept to deployment.Leverage AI Agents to automate repetitive coding tasks, maximizing their productivity.Continuously identify and implement improvements within our processes.Embrace curiosity and encourage knowledge sharing.Focus on delivering a seamless, connected experience for our customers.We prioritize growth, contribution, and impactful work over comfort and hierarchy. At Saily, we provide our talented team members with the autonomy and resources they need to excel.Key ResponsibilitiesEnhance our product by developing and maintaining innovative features.Create functionalities that support multi-dimensional personalization, A/B testing, and data analytics.Maintain a robust and high-quality codebase.Continuously seek opportunities to improve code quality and system performance.Provide mentorship on development best practices and offer technical guidance to peers.Contribute to the overall vision and long-term goals of the team.Conduct research and development as needed.Collaborate within a cross-functional team to ensure clear communication among all members.Work alongside engineering, product, and design experts from other teams.Note: This position requires in-office attendance three times a week.

Join the forefront of online security technology with the world’s leading VPN provider!Are you a passionate problem-solver eager to make impactful contributions? Become a key player in the team behind Threat Protection Pro, the NordLynx protocol, and the fastest VPN globally—tools designed to restore privacy, security, and user control.Your role? Empower millions to reclaim their online security, privacy, and data integrity.As a Senior Backend Engineer on our Notification Center Team, you’ll be vital in designing and maintaining the microservices that facilitate seamless in-app notification delivery. We take pride in being the backbone of numerous features that depend on these notifications for smooth functionality. Our collaborative spirit drives us to work closely with other teams at Nord to pave the way for a scalable future.Ready to tackle the challenges of scalability, code quality, and service stability? Join our team of skilled engineers dedicated to technical excellence and help shape the future of NordVPN and its associated products!

Join our team as a Backend Engineer and contribute to our innovative solutions at NordProtect. We are looking for talented individuals with a passion for technology and a strong background in backend development, specifically using Go. In this role, you will collaborate with cross-functional teams to design, implement, and maintain robust and scalable backend systems.

Join the Vanguard of Online Privacy!Are you a passionate problem-solver with a knack for innovation? Become a part of the team that brought you Threat Protection Pro, the NordLynx protocol, and the world’s fastest VPN, empowering users with privacy, security, and control over their digital landscape.Your Contribution: Enable millions of users to reclaim their online security, privacy, and data.Join our Notification Center Team and help shape the future of in-app notifications!As a Senior Backend Engineer, you will be instrumental in developing and maintaining the crucial microservices that ensure seamless in-app notification delivery. Our team is the backbone supporting a wide array of features across various teams that rely on efficient notification systems to operate. We are dedicated to collaborating with different Nord teams to pave the way for our scalable future.Are you prepared to tackle challenges related to scalability, cost efficiency, quality code, and maintenance? Help maintain a stable and functional service that acts as an essential component behind many features of NordVPN, NordPass, and NordLayer. Join our team of skilled engineers striving for technical excellence!

Join NordProtect and be a part of a pioneering identity theft protection service.As a key member of the Nord Security team, you will contribute to the development of an innovative platform that integrates dark web monitoring, credit tracking, and identity theft insurance into a single, powerful solution.Your contributions will be vital! You will empower individuals to safeguard their identities, identify threats proactively, and enhance their recovery capabilities.Welcome to NordProtect, your comprehensive shield against identity theft, financial fraud, and online scams. We deliver extensive monitoring, prompt threat detection, fast recovery, and dependable insurance, offering unmatched security and peace of mind for both individuals and businesses. The real champions of this advanced solution are cybersecurity and insurance professionals, and we invite you to join us in this mission to protect digital identities.Key ResponsibilitiesDesign and create microservices tailored to the daily needs of users requiring identity theft protection, ensuring the utmost security while managing a significant volume of personal identifiable information.Collaborate with cross-functional teams to guarantee the smooth integration and functionality of microservices throughout Nord Security's product suite, ensuring a cohesive and seamless user experience.Provide mentorship and technical direction to team members, fostering the growth of best practices within the engineering team.Play a crucial role in shaping the team's vision and contributing towards long-term objectives.Participate in research and development efforts to discover and implement advanced technologies as needed.Encourage effective communication and collaboration among team members and with other engineering, product, and design professionals across various teams.Demonstrate a collaborative mindset by actively engaging in discussions, challenging ideas, and embracing redesigns that contribute to collective success.Core QualificationsProven experience with backend technologies, particularly with Go.Strong understanding of system design principles, including knowledge of appropriate design patterns and their application.Familiarity with Agile methodologies and continuous integration practices.Ability to communicate technical concepts effectively to varied audiences.Experience in building scalable and resilient systems.

Join our dynamic team at Nord Checkout as a Backend Engineer, where you will play a vital role in developing and optimizing our backend systems using Go. This position is perfect for individuals who are passionate about backend development and are eager to contribute to innovative payment solutions.

Join the forefront of online privacy and security.At Nord Security, we are pioneers in developing cutting-edge tools like Threat Protection Pro and the NordLynx protocol, ensuring users regain control over their online security and privacy.Your Role: As part of the Nord Checkout team, you will contribute to building and maintaining essential services that enhance the user purchasing experience. Your work will ensure a secure, efficient, and enjoyable process for millions of users worldwide.Main Responsibilities:Design and implement highly scalable, resilient, and secure microservices.Write high-quality, tested, and maintainable code that performs well under load.Collaborate with cross-functional teams, including QA, DevOps, and security, to ensure seamless service delivery.Successfully deploy new features and technical fixes on schedule.Create comprehensive technical designs and maintain thorough documentation.Conduct research and development to solve complex challenges.Take ownership of projects from inception to completion.Embrace continuous professional development.

Welcome to the positive side of technology! You might recognize us by our previous name: Znany Lekarz. It all began over a decade ago when we posed a crucial question: is anyone in healthcare genuinely considering the needs of patients? We took action, empowering patients with the ability to leave and read reviews about their healthcare experiences. Simultaneously, we equipped doctors with innovative tools to streamline booking management, enabling them to focus on what truly matters: patient care. Today, we invite you to join us in our mission to humanize the healthcare experience.Docplanner: A Global LeaderWe proudly operate in 13 countries, with over 90 million patients relying on our services every month. More than 300,000 specialists trust our platform, backed by leading venture capital firms like Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners. Despite employing over 2,500 individuals worldwide, we maintain the innovative spirit of a startup that we began with over a decade ago.Docplanner Tech: Shaping the FutureAt Docplanner Tech, we are a diverse team of over 400 professionals in Engineering, Data, and Product teams, dedicated to creating our product for all our locations. Many team members have been with us for over five years, and we always welcome new colleagues with warmth and enthusiasm.While we could share more about ourselves, we encourage you to check our Glassdoor reviews to hear firsthand experiences. If you want to understand what it's like to be your true self at work, watch this video.Why Join Us?It's fulfilling to share with family and friends how your work contributes to making the world a better place. You’ll rest easy knowing that your efforts matter and that your skills resonate with your values.Our goal is to enhance the healthcare experience, and this journey begins with you being authentically yourself. We believe that embracing the diversity of human experiences leads to a better healthcare journey for everyone. We don’t just acknowledge our differences; we celebrate them. We encourage you to bring your whole self to work, including the choice to work remotely, as we are fully remote-friendly.

Join the forefront of digital security with the world's most advanced VPN.Are you a curious problem-solver eager to make a difference? Become part of the team that powers Threat Protection Pro, the NordLynx protocol, and the fastest VPN globally—innovative tools designed to restore privacy, security, and control to users everywhere.Your impact? Empower millions of users to reclaim their online security, privacy, and data.About Threat ProtectionIn an age of viruses, Trojans, worms, spyware, and other malware, ensuring online safety can be challenging. Our Threat Protection team is dedicated to solving these issues by developing robust software that safeguards our customers. You'll create scalable code capable of handling high volumes, security concerns, and complex architectures, all built from the ground up. If this sounds like the challenge you’ve been seeking, read on!Main ResponsibilitiesDesign and develop distributed microservices that shield millions from malware threats;Prioritize delivering high-quality code with a focus on scalability and security;Collaborate with a passionate team of developers to build and maintain our services using Golang;Take ownership of architecture, design, development, and deployment initiatives with respect and commitment.Core RequirementsExperience with distributed technologies and familiarity with NoSQL databases, particularly Cassandra or Kafka;Strong grasp of system design, with knowledge of applicable patterns;Passion for creating anti-virus solutions and enhancing online safety where your contributions will have a direct impact;Adept in backend architecture and technologies, willing to engage in discussions and share ideas; if you can deliver scalable and stable code, we want to connect with you;A collaborative spirit with a love for discussing, rethinking, and redesigning ideas that foster shared success within your team and the company.

Join HelloFresh in Warsaw as part of our HelloTech organization, a vital segment of our global technology team comprising over 1000 professionals. We are dedicated to developing digital products that enhance the end-to-end food experience, encompassing meal kits, ready-to-eat meals, and even specialty items like pet food and premium meat & seafood. Our technology platforms empower millions of customers with personalized food solutions every month.Our direct-to-consumer subscription model is fueled by cutting-edge technology that optimizes every customer interaction—from engaging applications and personalization algorithms to pricing strategies and supply chain management. Although our brands operate independently to cater to diverse customer needs, they are unified by shared platforms, data, and operational excellence crafted by HelloTech.At HelloTech, we work in autonomous, cross-functional teams that take ownership of specific products and domains. By collaborating with our Warsaw office, you will contribute to scalable, data-driven products used across various markets, leveraging a modern tech stack and working with international teams to continuously enhance how our customers discover, order, and enjoy HelloFresh products now and in the future.

About Docplanner Docplanner, known in Poland as ZnanyLekarz, began 12 years ago with a simple question: is healthcare truly centered on patients? Since then, the company has built a platform where patients can share and read reviews about their healthcare experiences, while doctors benefit from tools that streamline bookings and free up more time for patient care. The mission remains clear: strengthen the human side of healthcare. Our Impact Docplanner operates in 13 countries, serving over 90 million patients each month. More than 300,000 specialists trust our products. Backing from Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners has supported our growth. With a team of over 2,500 people worldwide, Docplanner has kept its entrepreneurial drive alive for more than a decade. Inside Docplanner Tech Docplanner Tech brings together more than 400 professionals across Engineering, Data, and Product. Many team members have been with us for over five years, and we welcome new colleagues warmly. Our teams work across all locations, building and improving the product every day. Curious about our culture? See what others say on Glassdoor. For a glimpse into life at Docplanner, watch this video. Why Work With Us? At Docplanner, work has purpose. Team members know their contributions make a real difference in the world. The company’s commitment to making healthcare more human starts with a culture that values authenticity and celebrates diversity. Everyone is encouraged to bring their whole self to work. Remote work is fully supported, and the environment is designed to help people thrive as they are.

Join the forefront of healthcare technology with Docplanner! You may recognize us by our previous name, Znany Lekarz. Over the past 12 years, we’ve been on a mission to revolutionize patient care in healthcare. We empower patients by providing them with tools to leave and read reviews about their medical experiences. Simultaneously, we equip healthcare professionals with technology that streamlines booking management, allowing them to focus on what they do best: caring for patients. Today, we're inviting you to be part of our journey to enhance the human aspect of healthcare.Docplanner's Global ImpactOperating in 13 countries and trusted by over 90 million patients monthly, Docplanner has become a go-to platform for more than 300,000 specialists. We are backed by reputable venture capital firms like Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners. With over 2,500 employees worldwide, we maintain the innovative spirit of a startup, even after a decade in the industry.About Docplanner TechAt Docplanner Tech, our diverse team of over 400 engineers, data analysts, and product managers is dedicated to building our products for all locations. Many of our team members have been with us for over five years, and we take pride in welcoming each new member with enthusiasm.Discover more about our workplace culture through our Glassdoor reviews or see how it feels to be your authentic self at work in this video.Why Join Us?Being part of our team means contributing to a better world, making a tangible difference. You can rest easy knowing your work aligns with your values and has a meaningful impact. We believe in embracing diversity and creating a healthcare experience that reflects the rich tapestry of human experience. With us, you can bring your whole self to work—whether that means working remotely or choosing to come into the office.

Join Groupon, a dynamic marketplace where customers uncover fresh experiences and services daily while empowering local businesses to thrive. With over a million merchant partners globally, we connect more than 16 million customers to exceptional deals across diverse categories. In a landscape often dominated by e-commerce giants, Groupon distinguishes itself as a platform uniquely dedicated to fostering the success of local businesses on a performance basis.We are on an ambitious journey to revolutionize our business through an unwavering commitment to results. Despite our expansive global team, we cultivate a culture that ignites innovation, embraces risk-taking, and celebrates achievements. Here, your impact can be immediate, thanks to our scale and the speed of our transformation. We embody the best of both worlds: large enough to offer resources and scale, yet small enough for individual contributions to make a significant difference.About the RoleAs a Senior Go-To-Market Engineer at Groupon, you will be the architect behind our revenue engine—designing and building automated systems that facilitate the discovery, enrichment, qualification, and engagement of merchants across international markets. This high-impact, individual contributor role will see you delivering work that directly influences pipeline and revenue. You’ll work collaboratively across Sales, Marketing, and Data teams while maintaining deep ownership of Groupon's Go-To-Market technical infrastructure. Your contributions will enable our teams to operate efficiently at scale across multiple markets, ensuring operational effectiveness and data integrity.ResponsibilitiesSystem Design and AutomationDesign, develop, and optimize robust automated workflows within the Go-To-Market tech stack utilizing Clay, Kubaru, Cloudingo, and Salesforce.Create scalable agentic workflows in Clay to assess and enrich business and contact data efficiently.Establish integrations linking Clay, Salesforce, internal merchant assessment tools, and marketing automation platforms.Lead Management and Data OperationsDevelop real-time lead scoring engines to prioritize high-value opportunities.Design and maintain dynamic lead routing systems to maximize conversion potential.

Join the forefront of online security with Nord Security!Are you an innovative backend engineer eager to tackle complex challenges? Become a pivotal part of our Threat Protection Pro team, which powers the renowned NordLynx protocol and is behind the fastest VPN globally. Our mission is to empower users by restoring their privacy, security, and control over their online experiences.Your contributions will: Help millions regain confidence in their online security and privacy.About Threat ProtectionAs cyber threats like viruses, Trojans, and spyware grow, ensuring a safe online experience is essential. Our dedicated Threat Protection team is committed to developing robust software solutions that safeguard our customers. If you thrive on creating scalable, secure code and tackling high-level architectural challenges from the ground up, you’ve found your next adventure!

About Our Team At SumUp, we provide a comprehensive Point-of-Sale (POS) solution designed to empower businesses such as cafes, shops, bars, and salons to streamline operations and foster growth. Our platform encompasses a variety of features including product catalogs, inventory management, business analytics, compliance assistance, and loyalty programs. The Fiscalization team is dedicated to ensuring compliance in countries like Italy, Sweden, Norway, Belgium, and Austria, among others. We are also pioneering the integration with third-party services for fiscalizing receipts. As a Senior Backend Engineer, you will work alongside a vibrant, cross-functional team comprising Product Managers, Designers, Engineering Managers, and fellow engineers. Your Role In this position, you will develop secure backend systems that ensure SumUp's POS products are compliant across various countries on our roadmap. You will collaborate with the Fiscalization squad to devise unique solutions tailored to the challenges in each market. We are looking for a developer who values user-centric design, precision, and seamless collaboration. You will excel in a structured communication environment and thrive in a cross-functional team. This is a B2B role based in Warsaw. Key Responsibilities Design and maintain fiscal compliance solutions to support SumUp's expansion across Italy, Sweden, Norway, Belgium, Austria, and other European markets. Develop integrations with third-party services for receipt fiscalization and regulatory reporting. Navigate SumUp's intricate POS ecosystem and familiarize yourself with fiscalization frameworks across multiple jurisdictions. Work collaboratively with team members and stakeholders distributed across 5+ cities in a hybrid working model. You Will Succeed in This Role If You Have: 5+ years of experience in backend engineering with expertise in Java and/or Kotlin. A solid understanding of system architecture, design principles, data modeling, and API development. Hands-on experience with distributed and fault-tolerant systems. Proficiency in AWS and Kubernetes. Strong knowledge of Kafka, PostgreSQL, and CQRS.

Join the Future of Healthcare Technology!At Docplanner, formerly known as Doctoralia, we've spent the last 12 years revolutionizing patient care. Our mission began with the simple question: Are patients at the forefront of healthcare? We took action to empower patients by providing them with the tools to share and read reviews about their healthcare experiences. Simultaneously, we developed technology that streamlines appointment management for doctors, allowing them to focus on what truly matters: providing exceptional care. Now, we invite you to be part of our journey in making healthcare more human.About DocplannerWith a presence in 13 countries, Docplanner is trusted by over 90 million patients each month and has the confidence of more than 300,000 healthcare professionals. Backed by esteemed venture capital firms such as Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners, we’ve retained our startup spirit while growing to over 2,500 employees globally.Why Join Us?Imagine sharing with your loved ones how your work contributes to a better world. At Docplanner, your efforts make a difference, and your skills align with meaningful values. We prioritize making healthcare experiences more human, embracing diversity and individuality. We celebrate your unique self and offer a fully remote working environment, allowing you to thrive in your own way.Position OverviewWe are seeking an Engineering Director to spearhead our innovative approach to product development, particularly in leveraging AI to enhance patient engagement. This role transcends traditional management; we need a leader who is deeply involved in coding and will actively pioneer AI-driven development practices. Your role will be predominantly hands-on with code (≈75%), while also driving transformation and providing technical leadership (≈25%).As a key driver of our AI-powered transformation, you will collaborate with teams and the broader Engineering community to fundamentally reshape how we develop patient-facing software. This position is ideal for individuals who excel in technical environments and can drive change through influence and example.

About the TeamJoin the Sell Online Tribe, a dynamic group that empowers merchants to establish their presence online. We create innovative tools that enable millions of entrepreneurs, from barbers to bakers, to market their products and services effortlessly. Our core focus lies in the Online Store and Bookings products, which form the backbone of SumUp’s ecosystem, allowing merchants to manage appointments, highlight their offerings, and process payments—all from their mobile devices.We are a collaborative, cross-functional team of Product Managers, Designers, and Engineers dedicated to delivering exceptional mobile experiences. As a part of this team, you will play a crucial role in expanding into new sectors, bridging the gap between web and mobile, and making digital selling seamless for small businesses worldwide.About the RoleAs a Senior Backend Engineer, you will be instrumental in enhancing SumUp's major merchant-facing online products within the Bifrost team. You will contribute to the development and scaling of key products such as Payment Links, Virtual Terminal, and Unified Gift Cards, while also working on integration solutions that are vital for numerous other SumUp offerings.We are looking for a developer who prioritizes reliability, teamwork, and continuous growth. Your backend expertise will thrive in a high-impact environment where your contributions directly influence merchant success and team scalability.What You’ll DoEnsure scalability and continuous growth of high-priority online products at SumUpDrive the implementation, development, and integration of Online Checkouts across SumUpEngage actively in planning and review sessions at quarterly and sprint levels, providing constructive feedback and estimationsMonitor existing services, applying necessary fixes to maintain platform reliabilityDevelop new features with maintainable and testable codeEnhance application performance for scalabilityParticipate in code reviews to uphold high coding standardsYou Will Excel in This Role If:You have 5+ years of experience in backend engineering with GolangYou possess a robust understanding of fundamental system architecture, design principles, data modeling, and API designYou have substantial experience with distributed and fault-tolerant systemsYou have a passion for delivering high-quality software solutions