Senior Backend Software Engineer

Join SplitMetrics, a pioneering global software company that empowers mobile-first businesses with an innovative ecosystem of products and services designed to drive growth. Our offerings include:SplitMetrics Acquire: A powerful platform for automating and optimizing Apple Ads.SplitMetrics Agency: A comprehensive mobile marketing agency backed by industry experts.SplitMetrics Optimize: An award-winning A/B testing platform recognized as the ASO Tool of the Year.App Radar by SplitMetrics: An advanced ASO platform offering in-depth keyword and competitor analysis.Why Choose SplitMetrics? With nearly a decade of experience, we lead the mobile marketing industry with cutting-edge technologies.As an Apple Ads Partner, we were the first to develop a management platform for Apple Ads.Collaborate with top mobile brands globally, including Skyscanner, Glovo, Flo, Babbel, and Wooga.Our ecosystem supports over $1 billion in ad spend annually.Incorporated AI into our strategic initiatives since 2023.Enjoy a remote-first culture that fosters collaboration across 20+ countries.We are on the lookout for a talented Senior Backend Engineer (Python) to join our dynamic team.

Hello! We are Bee Talents, an IT recruitment agency dedicated to assisting clients globally in establishing their technical teams since 2015. Currently, we invite you to join the recruitment process for Reef Technologies.About Reef Technologies:We are a fully remote team of senior Python backend engineers with over 5 years of experience.Our focus is on building complex distributed systems, ensuring low latency, fault tolerance, high scalability, and self-healing capabilities. We also develop APIs, databases, and libraries, diving into custom algorithm design as needed.Over the long term, we collaborate with startups globally, working on projects that range from one-off tasks to multi-year partnerships. Highlights of our work include a financial data warehouse for a London fintech, a graph search system for Norwegian auditors, and a scalable WAF for a client in Chicago.Beyond our technical endeavors, we actively shape Reef Technologies to be a desirable workplace. We co-create company policies using Sociocracy 3.0, a framework that ensures every voice is valued and rules are collaboratively established.Our primary objective at Reef Technologies is to accomplish tasks efficiently and effectively. We offer competitive rates and significant flexibility, expecting everyone to take accountability for their work and deliver promptly. We do not tolerate unresponsiveness.To ensure the best fit, we prioritize matching team members with suitable projects. You'll have substantial input in shaping your career path within the organization.Typically, we work between 30–40 hours a week, with ample flexibility in our schedules. Our team is globally distributed, with many of us working from Poland.

Join Attio: Pioneering the Future of CRM in the AI EraAt Attio, we are on a transformative mission to revolutionize Customer Relationship Management (CRM) for the age of artificial intelligence. Our goal is to create the first AI-native CRM solution tailored for the most ambitious go-to-market teams. Recently, we secured a $52M Series B funding led by GV (Google Ventures), alongside support from Redpoint, Balderton, Point Nine, and 01A. Our passionate team is dedicated to overcoming complex technical challenges, delighting users, and setting new industry benchmarks.About the RoleOur Engineering team is focused on tackling the most challenging problems so our users can thrive. We build real-time infrastructure, AI-native architecture, and a seamless frontend experience, all powered by a team that operates swiftly, thinks critically, and maintains exceptionally high standards for quality.We are seeking a Senior Product Engineer who is passionate about pushing boundaries, meticulous about details, and eager to help reshape how millions of individuals work.

As a Backend Engineer, you will play a crucial role in designing and implementing highly scalable, secure backend services for our innovative SaaS platform. Your primary focus will be on ensuring outstanding performance, reliability, and security throughout our systems.

First Connect Insurance Services operates a digital marketplace designed for independent insurance agents in Poland and beyond. The platform connects agents with over 30 leading US insurance carriers, offering a broad range of products including home, auto, and small business coverage. Technology sits at the core of First Connect’s approach. The company invests in software that brings a modern, consumer-grade experience to insurance professionals. Thousands of agents already rely on this platform, with the user base expanding rapidly. What you will work on This role centers on backend engineering for a remote team based in Poland. Work will support the ongoing development of tools and features that help agents access and manage insurance products efficiently. Who this role is for This position suits backend engineers interested in building technology for the insurance sector. The focus is on creating reliable, user-friendly systems that serve a growing community of agents.

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.

About Zowie:At Zowie, we are transforming the way businesses engage with their customers. Our vision is to create a future where AI Agents manage 100% of customer interactions, offering instant, tailored, and outstanding experiences.We recognize that AI Agents herald the next significant technological advancement, and Zowie is at the forefront of this evolution. Trusted by leading consumer brands such as Costco, DocMorris, Monos, Decathlon, and InPost, our AI Agents are already handling millions of conversations monthly in customer care.About the Role:As we see great enterprises harnessing our GenAI-powered platform to unlock substantial wins, we are committed to investing in the next wave of innovation—focusing on increased impact, seamless integrations, and expedited time-to-value. To support this initiative, we are expanding our engineering team and seeking dedicated Scala Engineers who are eager to work at the cutting edge of GenAI and contribute to the development of groundbreaking products.In this position, you will lay the groundwork that supports our AI Agents at scale, designing systems with a focus on reliability, performance, and adaptability. Interested in the technology you'll be working with? Explore our tutorials for a glimpse of our platform or see it in action here.An essential aspect of our culture is being an AI-native engineering organization. Here, you are not just permitted but expected to utilize modern AI tools in your daily tasks. The software engineering landscape is rapidly evolving with new AI tools, and we are at the forefront of this change. You will actively advance this frontier by leveraging AI for design exploration, code scaffolding, test generation, and decision documentation, all while adhering to strong engineering principles—such as clear contracts, readable code, robust test suites, observability, and maintainable architectures. This is not about haphazard coding; it's disciplined engineering, accelerated.If this vision excites you and you are already integrating AI into your coding practices, we would love to speak with you.

About WPP MediaWPP is the creative transformation company, harnessing creativity to shape a brighter future for our people, planet, clients, and communities. For further details, visit wpp.com.WPP Media operates as WPP’s global media collective, where we unify the best platforms, talent, and partnerships to unlock boundless growth opportunities in an ever-evolving media landscape. Visit wppmedia.com for more information.At WPP Media, we value the strength of our culture and our people, which empowers us to provide exceptional experiences for our clients and each other. In this role, you will play a vital part in upholding WPP and WPP Media’s core values:Be Extraordinary by Leading Collectively to Inspire Transformational Creativity.Create an Open environment by Balancing People and Client Experiences while Cultivating Trust.Lead Optimistically by Championing Growth and Development to Mobilize the Enterprise.Role Summary and ImpactAs a key member of the Global Operations Centre (GOC), you will collaborate with diverse teams across the United States, Europe, and Asia to deliver impactful solutions in a vibrant, multicultural setting. We are on the lookout for a skilled Backend Engineer to join our Data & Technology Solutions team. In this role, you will be essential in designing, developing, and maintaining scalable backend systems that drive our innovative marketing technologies, including the WPP Open AI platform. If you are passionate about crafting high-performance APIs, engaging with large datasets, and shaping the future of AdTech, we would love to connect with you.

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 HelloFresh in Warsaw as part of the HelloTech organization, our global technology backbone comprising over 1,000 professionals dedicated to developing digital products that enhance our comprehensive food experience. From meal kits and ready-to-eat meals to specialized offerings such as pet food and premium meat & seafood, HelloTech builds the platforms that deliver personalized food solutions to millions of customers each month. Our subscription-based, direct-to-consumer model leverages technology at every touchpoint—from customer-facing applications and personalization algorithms to pricing, forecasting, supply chain optimization, and initiatives aimed at minimizing food waste. Though our brands function independently to cater to unique customer needs, they are unified by shared platforms, data, and operational excellence fostered by HelloTech.At HelloTech, we operate in autonomous, cross-functional teams, each responsible for a specific product or domain from inception to completion. In collaboration with our Warsaw office, you will contribute to the development of scalable, data-driven products utilized across various markets, employing a modern tech stack and working alongside international teams to continually enhance how people discover, order, and enjoy HelloFresh’s offerings, both now and into the future.

Join our dynamic team at Lingarogroup as a Backend Developer! In this role, you will be responsible for designing, implementing, and maintaining server-side applications and databases, ensuring high performance and responsiveness to requests from the front-end. You will work closely with front-end developers to integrate user-facing elements with server-side logic.We are looking for someone who possesses a strong understanding of backend technologies, is highly motivated, and thrives in a collaborative environment.

About Zowie:At Zowie, we are at the forefront of transforming customer interactions through AI. Our vision is to create an environment where AI Agents manage all customer communications, providing instant, tailored, and outstanding service.We believe that AI Agents are poised to drive the next significant technological evolution, and Zowie is leading this movement. Major brands such as Costco, DocMorris, Monos, Decathlon, and InPost trust our AI Agents to spearhead their customer service, managing millions of interactions every month.About the Role:As our GenAI-powered platform is already being utilized by large enterprises for mission-critical applications and achieving substantial results, we're expanding our engineering team to foster greater impact, seamless integrations, and quicker value delivery. We are looking for adaptable Senior Backend Engineers eager to engage with the latest in GenAI technology and contribute to pioneering impactful solutions.In this role, you will lay the groundwork that enables our AI Agents to operate at scale, crafting systems that prioritize reliability, performance, and adaptability. Interested in the technology you'll be developing? Explore these tutorials to familiarize yourself with our platform, or see it in action here.Key Points:1. This position is tailored for software engineers who think beyond a single technology stack. You should have a strong command of at least one of the following programming languages: Java, Scala, or Python, and be open to utilizing others when appropriate.2. We operate as an AI-native engineering organization, encouraging the use of modern AI tools in your daily tasks. Software engineering is rapidly evolving with new AI technologies, and you will be at the forefront of this shift: applying AI for design exploration, code scaffolding, test generation, and decision documentation, all while maintaining rigorous engineering standards—clear contracts, readable code, robust test suites, observability, and sustainable architectures. This is disciplined engineering at an accelerated pace.

Join HelloFresh in the vibrant city of Warsaw as part of our dynamic HelloTech organization, a global technology powerhouse comprising over 1,000 talented individuals. Together, we create innovative digital solutions that elevate the culinary experience for our customers. From meal kits and convenient ready-to-eat options to specialty items such as premium meats and pet food, HelloTech is the driving force behind our mission to deliver personalized food solutions to millions each month. Our subscription-based, direct-to-consumer model is deeply rooted in technology, ensuring excellence at every stage—from customer-facing applications and personalized experiences to robust pricing strategies, accurate forecasting, and optimized supply chains. Despite our brands catering to unique customer needs, we thrive on shared platforms, data, and operational excellence driven by HelloTech. At HelloTech, we operate through autonomous, cross-functional alliances, each responsible for specific products or domains. By collaborating within our Warsaw office, you will contribute to the development of scalable, data-driven products that enhance the way customers discover, order, and enjoy HelloFresh offerings, now and in the future.

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.

Join HelloFresh as a Senior Backend Engineer focused on transforming the finance technology landscape. In this pivotal role, you will develop and optimize backend systems to enhance our financial operations, ensuring efficiency and reliability across our services.

Location: Poland About Us: RTB House stands at the forefront of marketing technology, delivering cutting-edge solutions to leading brands and agencies around the globe. Our proprietary ad-buying engine is the world's first to utilize Deep Learning algorithms exclusively, empowering advertisers to achieve remarkable results at every stage of their marketing funnel. We are on the lookout for a Backend Python Developer to become an integral part of our internal team at RTB House. In this role, you will engage in the development of applications and tools that directly enhance our real-time bidding operations. Collaborating with seasoned engineers and product teams, this position offers a fantastic opportunity for developers eager to expand their skill set, tackle real-world challenges, and create robust software that makes a tangible impact.

Join MyDr, a pioneering team of technology enthusiasts dedicated to revolutionizing the healthcare sector. We develop sophisticated software solutions for Electronic Medical Documentation and holistic clinic management, bringing the Polish healthcare system into the modern age for both practitioners and patients.Our flagship solution, MyDr EDM, is trusted by over 10,000 clinics, including those partnering with the National Health Fund (NFZ). It delivers a comprehensive suite of functionalities that enhances daily operations in medical facilities—from advanced scheduling and essential appointment tools (e-prescriptions, e-referrals, and e-sick leaves) to cutting-edge telemedicine solutions and seamless integration with the government P1 Platform.Additionally, we proudly offer dr100, a specialized program tailored for dental practices, featuring unique tools such as interactive dental diagrams and dedicated modules for periodontal, prosthetic, and orthodontic needs.Since our founding in 2017, MyDr has established itself as a leader in cloud-based EDM solutions within Poland's medical software market, consistently innovating to meet the evolving needs of healthcare providers.

N-iX is a prominent global software development company with Ukrainian roots, dedicated to assisting businesses around the world in creating successful software products. With over two decades of experience, N-iX has established partnerships with technology firms, enterprises, and startups, delivering high-quality software solutions and fostering robust engineering teams across Europe.We are seeking a Senior Automation QA Engineer to join our team, contributing to the development of a large-scale enterprise facility management platform for a leading US-based product company. In this pivotal role, you will be responsible for designing, implementing, and maintaining automated tests, enhancing test coverage, and supporting performance testing initiatives.

Join Fairmarkit as a Senior Software Engineer, where you will be instrumental in developing innovative software solutions that drive efficiency and improvement across our platform. You'll collaborate with cross-functional teams to design, develop, and implement new features, ensuring high performance and responsiveness. If you are passionate about technology and eager to tackle complex challenges, we would love to hear from you!