
RTB House · Poland
Location: Poland We Are: RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help bran...
Location: Poland
RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help
brands grow. The company is the market leader in driving performance using Deep Learning across the entire purchase funnel.
Founded in 2012 and now operating in 90+ markets, RTB House has always been private-by-design. It embraces first-party advertising
and a relentless approach to innovation. RTB House offers end-to-end Deep Learning-powered AdTech products and solutions to
maximize conversion, drive new customer acquisition, create engagement, and fuel long-term demand for a global base of clients.
In 2026, RTB House launched rtb.com, a self-service platform specifically designed to allow small and medium-sized businesses and
agencies to deploy auto-built creatives and maximize performance on any budget.
The Supply Engineering team is crucial in driving our company's success, working collaboratively to ensure bidding platform
integrations health with external partners, navigate the complexity of working with 120+ large scale connections and offer
valuable analytical insights into inner workings of various ad tech integrations.
supply partners.
dynamic project.
Apply now!
You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.
At Ledgy, we’re on a mission to make Europe a powerhouse of entrepreneurship by building a modern, tech-driven equity management and financial reporting platform for private and public companies. In 2026, we aim to be the leading provider for European IPOs and reporting for share-based payments. We are a value-based company with a core focus on being humble, transparent, ambitious and impactful, all in order to delivery the best experience for our customers and end users. We are proud to partner with some of the world’s leading investors. New Enterprise Associates led our $22m Series B [https://techcrunch.com/2022/09/21/ledgy-a-carta-for-european-startups-to-manage-equity-and-cap-tables-raises-22m-from-nea-sequoia-and-more/] round in 2022, with Philip Chopin joining Sequoia’s Luciana Lixandru on our board. We were founded in Switzerland in 2017 and today we operate globally from offices in Zurich and London. We encourage diversity and are an international team coming from 26 different countries and speaking 25 different languages. About the role As a Mid-level Software Engineer at Ledgy, you’ll build reliable, scalable product experiences that help companies manage their equity with confidence. You’ll work closely with experienced engineers, product managers, and designers to turn complex equity workflows into clear, automated, user-friendly software. This role is a strong fit if you’re ready to take ownership of well-scoped projects, grow your technical judgement, and contribute across the stack while learning from senior peers. Location: We hire remotely across the UK, Spain, Germany, Poland, and Romania. For candidates based in London, we use a hybrid model with 2 days in the office per week. Teams we are hiring for: * Core Equity — Owns the foundational logic that powers Ledgy’s equity engine. Every equity-related event — such as issuing shares, creating new pools, or adjusting ownership — generates transactions. This team defines and maintains the transaction logic, data model, and core domain behaviour that ensure Ledgy’s platform remains accurate, scalable, and compliant. They also enable employees to sell their shares seamlessly once vested. * Workflows & Automation — Focuses on automating complex equity workflows and integrating with third-party services, including the trading exchange. The team builds systems that help company admins efficiently onboard and offboard employees, automate equity grants and terminations. * Reporting — Transforms Ledgy’s core equity data into financial, operational, and compliance reports. The team manages large, complex datasets and ensures reporting is accurate, performant, and reliable across jurisdictions and company structures. Their work powers the insights companies and auditors rely on for decision-making and transparency. * Tax — Ensures taxes are correctly reflected throughout equity operations, especially moments such as exercising, selling, mobility, and other taxable events. As a future team, Tax will build end-to-end product capabilities across the stack, helping customers manage complex tax and compliance requirements accurately across jurisdictions. You will thrive in the role if you * You have 3+ years of experience working as a Software Engineer * You are comfortable building and shipping production-quality features across the stack * You enjoy learning complex domains and turning them into simple, maintainable product experiences * You care about clean, tested, readable code and thoughtful collaboration * You are curious about equity, financial workflows, and their real-world impact on companies and employees * You’re excited to grow your technical judgement through code reviews, pairing, and architecture discussions * You take ownership of your work while asking for input early when trade-offs are unclear Our Tech Stack*: We have a modern, cohesive stack that lets us move fast while maintaining quality: * Language: TypeScript * Frontend: React, Tailwind CSS, tRPC * Backend: tRPC, Node.js, MongoDB, Temporal * Infrastructure: GCP, Terraform Cloud, Kubernetes, Docker, GitHub Actions *We don’t expect proficiency in this specific stack What Your Journey Could Look Like First 30 days: * Be paired with an onboarding buddy who will introduce you to the world of equity management * Get to know your engineering team, product managers, and designers * Learn how your team’s domain connects to the broader Ledgy platform * Set up your development environment and start contributing small, well-scoped changes * Build familiarity with our codebase, product workflows, and engineering practices First 3 months: * Ship product features and improvements with increasing independence * Work with teammates to break down problems, understand trade-offs, and deliver reliable solutions * Participate actively in code reviews and team discussions * Develop a deeper understanding of how companies manage and automate equity * Contribute to improving quality, maintainability, and user experience in your team’s domain First 6–12 months: * Own medium-sized features from implementation through release * Collaborate with Product and Design to shape pragmatic, user-centric solutions * Contribute to technical discussions around data models, workflows, and scalability * Continue growing toward senior-level ownership, judgement, and impact The interview process: * Getting to know you (45 min): Meet with someone from our people team to talk about your experience and to ask questions about the role * Live Coding (60 min): An equity domain problem to solve collaboratively using your preferred language and IDE. We want to see how you think, so this step does not allow AI. But you can freely look up syntax questions if you need to. * System Design (60 min): A system design session focused on practical problem-solving, clear trade-offs, and how you structure technical thinking * Case Study (60 min): Collaborate with a product manager and engineer to explore a problem related to Ledgy’s domain. Focus is on understanding requirements, product thinking, and implementation trade-offs. * Culture Interview: A chance to meet one of our founders and your hiring manager for a 30-minute chat about Ledgy’s mission and values * Offer 🎉 Being part of Ledgy means: * Recharge and re-energize with flexible working hours, 25 days of vacation, and up to 40 days of remote work from outside your home country. * We make space for your own professional development, with a generous yearly learning & development budget. * This role will receive a competitive salary + benefits + equity. All salaries are aligned with competitively benchmarked ranges based on work location and levelling. * For candidates based in London or Zurich we use a hybrid work model of 2 days in the office per week.
COMPANY BACKGROUND Our client is a people-first financial services company that leverages technology to help consumers overcome debt and build a stronger financial future. With over 2,000 employees across the U.S., the company is expanding through a new division focused on home mortgage solutions. PROJECT DESCRIPTION The Software Development Engineer in Test will design, test, and deploy effective test automation solutions to monitor, validate, and orchestration software throughout all stages of the SDLC. TECHNOLOGIES * Java + Unirest * JavaScript + WebDriverIO * Selenide, Cucumber * Maven, CircleCI, Google Cloud Platform, Cloud Firestore, Docker, Kubernetes, Datadog, LaunchDarkly WHAT YOU'LL DO * Design, develop, and maintain automated tests for UI and API layers; * Execute, analyze, and maintain automation test runs; * Build automation coverage across functional, integration, regression, and performance testing; * Improve and maintain automation frameworks and best practices; * Work independently on assigned streams or standalone automation tasks; * Collaborate with Agile teams and follow QA standards; JOB REQUIREMENTS * 3+ years experience in QA Automation; * 5+ years overall IT experience (preferable); * Strong understanding/experience in QA in general (including manual QA artifacts); * Strong background in at least one programming language (JavaScript is preferred); * Readiness to work with JavaScript right away is required; * Readiness to work with Java is required; * Experience working on both UI (WebdriverIO or Selenium)/API (Unirest or RestAssured) automation; * CI/CD understanding; * Ability to occasionally overlap with the client’s later working hours, with meetings possible up to 8:00 PM Poland time; * English level: B2 (Upper-Intermediate) or higher; WHAT DO WE OFFER The global benefits package includes: * Technical and non-technical training for professional and personal growth; * Internal conferences and meetups to learn from industry experts; * Support and mentorship from an experienced employee to help you professional grow and development; * Health insurance; * English courses; * Sports activities to promote a healthy lifestyle; * Flexible work options, including remote and hybrid opportunities; * Referral program for bringing in new talent; * Work anniversary program and additional vacation days.
COMPANY BACKGROUND Our client is a US-based software company that builds an operations platform for restaurant, cruise, hospitality, and foodservice businesses. Their products help multi-location companies manage inventory, food costs, labor scheduling, compliance, operational workflows, analytics, and reporting from one centralized system. The platform supports 125,000+ restaurant locations worldwide. PROJECT DESCRIPTION The project is focused on a mobile application for the cruise industry, where the team is developing new customer-facing features to enhance the guest experience. As part of the product roadmap, the existing functionality is gradually being extracted into a separate standalone application. The development process involves close collaboration with the web development team to align requirements, ensure feature consistency across platforms, and support a seamless transition of shared functionality. TECHNOLOGIES * Flutter, Dart * Flutter DevTools * Provider * Bloc * Firebase Push Notifications * Git WHAT YOU'LL DO * Develop mobile applications for Android and iOS using Flutter framework; * Create and manage navigation flows within the application, including routing, page transitions, and deep linking; * Collaborate with the product and design teams to understand project requirements and design guidelines; * Write clean, maintainable, and efficient code; * Ensure the performance, quality, and responsiveness of applications; * Create bridges in native code (platform-specific code) when necessary to integrate with device-specific features and APIs; * Participate in triaging incidents and issues reported by the support team; * Monitor and analyze production problems, responding promptly to incidents; * Ensure high code quality by covering functionality with automated tests; JOB REQUIREMENTS * 4+ years of commercial experience with Flutter; * Strong knowledge of Dart and Flutter; * Experience with state management, for example Provider or Bloc; * Understanding of architecture and design patterns; * Experience with Flutter navigation, routing, page transitions, and deep linking; * Ability to create native bridges when platform-specific functionality is needed; * Experience with async code and isolates; * Experience with unit, widget, or automation testing; * Ability to understand the business domain, not just implement tasks mechanically; * Ability to communicate technical decisions clearly to leads and the team; * Willingness to share knowledge and contribute to team growth; * Ability to have 4 hours of overlap with the Boston team, until 12:00 PM UTC-5; * English level from Upper-Intermediate or higher; NICE TO HAVE * Familiarity with Swift or Kotlin is a plus; * Experience with Firebase push notifications; * Experience with other mobile development frameworks; WHAT DO WE OFFER The global benefits package includes: * Technical and non-technical training for professional and personal growth; * Internal conferences and meetups to learn from industry experts; * Support and mentorship from an experienced employee to help you professional grow and development; * Health insurance; * Sports activities to promote a healthy lifestyle; * Flexible work options, including remote and hybrid opportunities; * Referral program for bringing in new talent; * Work anniversary program and additional vacation days.