Senior Fullstack Developer

Valtech

Why Valtech? We’re the experience innovation company - a trusted partner to the world’s most recognized brands. To our people we offer growth opportunities, a values-driven culture, international careers and the chance to shape the future of experience.  THE OPPORTUNITY At Valtech, you’ll find an environment designed for continuous learning, meaningful impact, and professional growth. Whether you're pioneering new digital solutions, challenging conventional thinking or building the next generation of customer experiences, your work will help transform industries.  We are proud of:  * The work we do and the innovation we drive  * Our values of share, care and dare  * A workplace culture that fosters creativity, diversity and autonomy  * Our borderless, global framework, which enables seamless collaboration  The role   We are looking for an experienced Senior Data Engineer to design, build, and optimize modern, cloud-based data platforms that power analytics, AI, and data products across the organization. Beyond technical delivery, we're looking for someone genuinely curious about the business problems behind the data — someone who can apply common sense thinking, detailed analysis, and experience-based recommendations to help derive and shape business requirements, not just implement them as given. You will work on scalable batch, streaming, and near-real-time pipelines, enabling high-quality, curated datasets while ensuring robust data governance, security, and observability across the data ecosystem. You will also play a key role in supporting AI and GenAI systems, enabling pipelines for machine learning, causal modeling, and LLM-powered applications such as RAG and agent-based systems. Our preferred platforms are Microsoft Azure / Fabric (primary), GCP, AWS, Databricks, and Snowflake, with Azure experience being highly transferable to Fabric. You will collaborate closely with data scientists, ML engineers, and platform teams to ensure the data foundation supports production-grade, decision-oriented AI systems. Role responsibilities Build & Data Platform Engineering Design and implement scalable data platforms and pipelines across cloud environments (Azure/Fabric, AWS, GCP, Databricks, Snowflake). This includes developing reliable batch, streaming, and near-real-time pipelines using technologies such as Spark and Delta Lake, and building ingestion, transformation, and curation workflows for both structured and unstructured data. You will implement modern data architectures including lakehouse patterns and medallion layering (bronze, silver, gold), ensuring systems are reusable, scalable, and aligned with enterprise needs. Enable AI, GenAI & Data Products Deliver high-quality datasets that support analytics, machine learning, causal modeling, and optimization systems. You will enable data pipelines for GenAI use cases (including LLMs, RAG pipelines, and vector-based data flows), as well as agent-based architectures and intelligent workflows, ensuring that data is model-ready and production-grade. Data Modeling, Orchestration & Automation Design scalable logical and physical data models for analytical and operational use cases, ensuring consistency across domains. Orchestrate workflows using tools such as Airflow, dbt, Lakeflow, or equivalents, with strong focus on automation, reliability, and maintainability of end-to-end pipelines. Architecture, Governance & Observability Apply modern architecture patterns including event-driven and streaming architectures, and ensure adherence to best practices in data governance, lineage, quality, and access control (RBAC/ABAC). Establish strong data observability, including monitoring of data freshness, pipeline reliability, and SLA adherence, ensuring systems remain trustworthy and production-ready. Data Serving, Integration & Optimization Enable data serving layers (APIs, feature inputs, analytical endpoints) to support downstream systems, including ML and AI platforms. Continuously monitor and optimize pipelines and infrastructure for performance, scalability, and cost efficiency. Requirements Discovery & Business Partnership Bring genuine curiosity to every engagement — ask the right questions to understand not just what stakeholders are asking for, but why. Apply common sense thinking, detailed analysis, and experience-based recommendations to help derive and refine business requirements, surfacing gaps or better alternatives where they exist rather than simply executing a brief as written. Collaboration Work closely with data scientists, ML engineers, analysts, and business stakeholders to translate requirements into robust data solutions. Support adoption of data products and contribute to best practices across the data and AI ecosystem. Must have qualifications Technical skills Strong hands-on experience with Apache Spark and Delta Lake, and strong programming skills in Python and SQL. Proven experience building batch and streaming data pipelines and production-grade data platforms, with solid understanding of data modeling, data quality, and governance principles. Cloud & Platforms (Key Requirement) Experience with one or more major cloud platforms, with preference for Microsoft Azure / Fabric, as well as AWS or GCP. Familiarity with modern data platforms such as Databricks and Snowflake is expected. Architecture & Systems Thinking Experience with lakehouse architectures and distributed data systems, and strong understanding of scalability, reliability, and performance considerations in data pipelines. Mindset Naturally curious, with strong problem-solving skills focused on scalability and reliability, and a collaborative approach to working in cross-functional teams. Comfortable applying common sense thinking, detailed analysis, and experience-based recommendations to help derive and challenge business requirements rather than taking them at face value. Experience in Agile or consulting environments is beneficial. Nice to have qualifications   Experience with GenAI and AI data systems (e.g., RAG pipelines, vector databases, LLM data preparation), as well as CI/CD for data pipelines and infrastructure-as-code tools such as Terraform, ARM, or CloudFormation.  Additional exposure to streaming technologies (e.g., Kafka), Spark optimization, or advanced analytics and ML workloads (including causal or experimentation platforms) is valuable. Experience building data products or large-scale analytics platforms is also beneficial.  Commitment to reaching all kinds of people  We design experiences that work for all kinds of people - and that starts with our own teams. At Valtech, we’re intentional about building an inclusive culture where everyone feels supported to grow, thrive and achieve their goals. No matter your background, you belong here. Explore our Diversity & Inclusion site to see how we’re creating a more equitable Valtech for all.  THE BENEFITS   This is a position based in Portugal.  Beyond a competitive compensation package, we offer:  * Flexibility, with remote and hybrid work options (country-dependent)  * Career advancement, with international mobility and professional development programs  * Learning and development, with access to cutting-edge tools, training and industry experts  Our benefits are tailored to each location. Your Talent Partner will provide full details during the hiring process.  YOUR APPLICATION PROCESS Once you apply, our Talent Acquisition team will review your application. Your CV should cover key information on relevant experiences and expertise. We do not require information such as age, gender, marital status, or a headshot in your application. We review all candidates based on skills, experience, and potential. ⚠️ Beware of recruitment fraud! We are committed to inclusion and accessibility. If you need reasonable accommodations during the interview process, please either indicate it in your application or let your Talent Partner know.  ABOUT VALTECH Valtech is the experience innovation company that exists to unlock a better way to experience the world. By blending crafts, categories, and cultures, we help brands unlock new value in an increasingly digital world.  At the intersection of data, AI, creativity, and technology, we drive transformation for leading organizations, including L’Oréal, Mars, Audi, P&G, Volkswagen Dolby, and more.  At Valtech, we don’t just talk about transformation. We make it happen. Our people are the heart of our success, and we foster a workplace where everyone has the support to thrive, grow and innovate.  Are you ready to create what’s next? Join us.

Catawiki

At Catawiki, every day brings the extraordinary! Whether it’s Daniel Ricciardo’s Formula 1 Car, a Woolly Mammoth’s Skeleton, Lady Gaga's Jumpsuit or Usain Bolt’s running shoe, we encounter exceptional objects every day. We’re a one-of-a-kind marketplace for buying and selling special objects. Each week, more than 100,000 unique items are auctioned, all carefully curated by our passionate in-house experts. Having sold over 25 million unique objects, our mission is to become the world’s most popular destination for special objects. As a growing, diverse and sustainable scale-up, we proudly live by three core values. If these values resonate with you, we’d love to explore how you can join us. * Taking ownership and driving impact  * Being open to change and feedback * Being passionate about our mission and our customers.  ABOUT THE ROLE Ready to own the numbers behind extraordinary objects? At Catawiki, every day brings something extraordinary. From rare collectibles to iconic memorabilia, millions of special objects pass through our marketplace. Behind the scenes, our Finance team helps keep everything running smoothly as we continue to grow internationally. We’re looking for a hands-on Senior Financial Accountant to join our Accounting & Reporting team. This role is ideal for someone with strong accounting fundamentals, a proactive mindset and the confidence to independently manage accounting responsibilities in an international and fast-moving environment. While this role is based in Portugal, you will work closely with our Finance team in the Netherlands and collaborate daily with stakeholders across the business. As Finance is not yet locally represented in Portugal, this is a role for someone who enjoys ownership, works well independently and feels comfortable operating in a highly collaborative remote setup. You won’t just process numbers; you’ll help strengthen the financial backbone behind millions of special objects while contributing to smarter and more scalable Finance processes.   WHAT YOU’LL DO You will become a trusted owner of selected accounting areas and help ensure Catawiki’s financial reporting remains accurate, reliable and scalable as the business continues to grow internationally. Beyond the month-end close, you’ll help strengthen processes, improve reporting quality and partner with stakeholders across Finance and the wider business to solve accounting and reporting challenges. YOUR CORE RESPONSIBILITIES * Own selected month-end close activities, including journal entries, accruals, reconciliations and balance sheet reviews * Manage accounting areas or entities through the close process with a strong focus on accuracy, completeness and timely delivery * Act as a key Finance partner to Payroll, ensuring accurate payroll processing and payment controls * Analyse financial movements and variances and provide clear insights to stakeholders * Ensure accounting activities are performed in line with internal policies and reporting requirements * Support internal and external audits by preparing documentation and coordinating follow-ups * Work with external accounting partners for foreign entities and support local reporting activities where needed * Partner with Finance and business stakeholders to resolve accounting and reporting questions * Use Workday Financials in your daily work and support process improvements where relevant * Represent Accounting & Reporting in cross-functional projects and assess the impact on Finance processes and controls * Proactively identify risks, issues and opportunities for simplification * Drive improvements in Finance processes, controls and reporting to support scalable and efficient ways of working You’ll gain broad exposure to accounting and reporting in a growing international marketplace environment. WHAT MAKES THIS ROLE EXCITING? * High ownership and autonomy: This is a role with a high level of trust and responsibility. You’ll independently manage accounting areas end to end while staying closely connected with the wider Finance organisation remotely. * International exposure: You’ll work with stakeholders across multiple countries and support accounting and reporting activities in an international marketplace business. * Real impact: You won’t just prepare journals; you’ll help improve processes, strengthen controls and contribute to better financial insights and decision-making. * A modern way of working: You’ll be part of an international Finance team that collaborates digitally, values ownership and embraces continuous improvement, automation and scalability. Collaboration beyond borders: Although your day-to-day collaboration will happen remotely, we believe personal connection matters too. You can expect occasional travel to Amsterdam or our Portugal office to connect with colleagues, collaborate in person and strengthen team relationships. WHAT YOU’LL BRING We’re looking for someone with strong accounting fundamentals who combines ownership, analytical thinking and attention to detail with a pragmatic, hands-on approach. Experience & background * Bachelor’s or Master’s degree in Finance, Accounting, Business Economics or similar, preferably obtained in Portugal * Certified Accountant (Contabilista Certificado) status or equivalent * Solid experience in financial accounting, preferably in an international, marketplace, e-commerce, platform or tech environment * Hands-on experience with month-end close activities, including journals, accruals and reconciliations * Strong understanding of accounting principles; IFRS knowledge is a plus * Experience supporting audits and working with internal or external stakeholders * Experience with Workday Financials is a plus * Fluent in English, both written and spoken WHERE YOU’LL WORK This role is based in Portugal and forms part of our Accounting & Reporting team within Finance, headquartered in the Netherlands. WHY YOU'LL LOVE WORKING WITH US * Create a visible impact by working at scale in a global organisation serving millions of customers across 80+ categories. In our flat structure, every role has a broad scope and directly impacts both our customers and the business. * Learn and grow through our Learning & Development initiatives, including clear development plans and mentorship programmes to support your career progression. * A culture of connection defines us. We’re a passionate, diverse team of 800+ Catawikians representing 60+ nationalities. We foster an inclusive and queer-friendly environment where everyone is encouraged to bring their full self to work. * Celebrate life’s moments with us. You’ll receive a €100 Catavoucher when you join, a €50 Catavoucher on your birthday, and an extra day off each year to “Pursue Your Passion”. We also offer additional leave for key work anniversaries and important life events. Benefits may vary by location. OUR OFFICES AND WAY OF WORKING Our vibrant offices in Amsterdam and Lisbon are designed to inspire collaboration. Most Catawikians operate in a hybrid setup, combining office-based and remote work, with a minimum of two days per week in the office, unless a role is explicitly stated as fully remote or fully office-based. INTERESTED? Apply with an English CV and Cover Letter. By applying, you agree to Catawiki’s Applicant Privacy Policy. If you’re excited about this role but don’t meet every requirement, we still encourage you to apply anyway. You may be just the right candidate for this or other roles.

Dapper

Are you our new Senior Performance Marketer? Dapper is looking for a Senior Performance Marketer with a pioneering spirit - someone ambitious enough to help us build the #1 B2B marketing agency worldwide. As a Senior Performance Marketer, you’ll play a key role in helping our clients drive online growth, from strategy to execution. We work with a diverse range of B2B businesses across the globe: from promising start-ups to fast-growing scale-ups, and beyond. At Dapper, we believe B2B marketing needs a revolution. Our mission is to make B2B marketing less boring, more creative, and more impactful. This job is for you if you: * Have 5+ years of relevant experience, ideally in a B2B context, fast scaling, or agency environment. * You bring a growth mindset, open to feedback, focused on learning, and always looking for ways to improve and support others in doing the same. * Bring a strategic mindset, but still enjoy jumping into the details, whether it’s presenting a paid strategy for a client or deep diving into the analytics. * Take full ownership of your projects, challenging the brief, aligning with clients, and pushing for better outcomes through collaboration with the team. * Are confident owning and leading client relationships, from onboarding and strategy to reviews and roadmap planning. What we value in everyone at Dapper Dapper works as a close-knit team with different perspectives, but the same energy to push boundaries and raise the bar. Regardless of your role, there are a few qualities we look for in every team member: * You communicate clearly and proactively in English, whether it’s with teammates, clients, or through your work, you keep things sharp, structured, and on point. * You are flexible and stay focused when things change, you adapt without losing momentum, and find smart ways to move forward. * You want to grow and make an impact, you take ownership, welcome feedback, and push yourself (and others) to raise the bar. * You bring positive energy and curiosity, you enjoy solving problems, testing ideas, and collaborating with people who care about what they do. A list of reasons why you might enjoy working with us: At Dapper, we not only help our clients to grow but ensure that we are always committed to advancing ourselves. We get the job done and celebrate afterwards. * Consult fast-growing B2B companies * Meal vouchers * Health Insurance coverage * 26 days of paid leave * 10 additional unpaid leave days * Receive training from the leading B2B Marketing experts * Complimentary Macbook * Complimentary annual Dapper work vacation with the team * Annual trip to the Rotterdam office * Gym and wellness facility membership * Team activities throughout the year * You’re welcomed into a positive work environment where freedom, teamwork, and respect are key Who are we? Dapper is a fast-growing B2B marketing agency, headquartered in Rotterdam with a second office in Lisbon. Since 2019, we’ve been redefining what’s possible in B2B marketing. Thanks to our vision and ambition, within six years Dapper has grown to become B2B Agency of the Year (2025) according to the European Agency Awards. It’s our ambition to become the #1 B2B Marketing Agency worldwide in the next ten years. We’re home to 65 passionate marketers with a wide range of expertise: performance specialists, content marketers, designers, and more. We represent over 21 nationalities, which helps us serve B2B businesses worldwide. We prioritize growth, both on a company and personal level. Join Dapper if you want to fast-track your development and work at the forefront of B2B Marketing. We work by our values: 1. We Peak Perform: We are always on the top of our game, and are passionate about what we do. 2. We Pioneer: We are innovators at heart. We come first while others follow and drive change. 3. We don't work, we Play: We enjoy the adventure that we're on together. Ready? Set? Go! Are you ready to take the next step with us? Leave your info here, and we’ll be in touch soon. And who knows… See you soon!