April 8, 2026
Senior Fullstack developer (AdTech & Data Platform)
Senior • On-site
Stockholm, Sweden
emagine is looking for a Senior Full Stack Engineer to join a team focused on building scalable systems for tracking, attribution, and data-driven marketing.
Start: ASAP or within 1 month
Duration: 12 months
Location: Stockholm, 2-3 days/week at the office
About the role
AdTech Platform Ownership
Own and manage paid media AdTech platforms, including an MMP such as AppsFlyer
Integrate, optimize, and evaluate new vendors and capabilities
Measurement & Attribution
Ensure reliable event tracking, attribution, and data quality across platforms
Collaborate with consent/privacy teams to meet regulatory requirements
First-Party Data & Activation
Enable scalable audience creation and activation for acquisition and retargeting
Improve automation and experimentation velocity
Customer Link Infrastructure
Build and maintain systems for link generation, redirection, and attribution
Support flows across paid media, CRM channels, referrals, and web-to-app journeys
Reliability & Operations
Ensure high availability, monitoring, and observability of tracking systems
Maintain and troubleshoot AdTech-related services and pipelines
Your profile
Full Stack JavaScript (Node.js, TypeScript) in scalable systems
Data pipelines and orchestration (e.g. Apache Airflow)
Distributed systems, APIs, cloud infrastructure
Experience with data flows, tracking, or integrations
AdTech/MarTech experience is a plus
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Krakow, Poland
🏢 Summary: Senior Full Stack Engineer role focused on building scalable end-to-end web applications for the financial industry using modern frontend and backend technologies. The position involves developing responsive interfaces, backend systems, APIs and databases while collaborating with cross-functional teams and DevOps engineers. The offer includes remote flexibility, career development programs, certifications and comprehensive employee benefits. 🗂️ Requirements: Bachelor's or Master's degree in Computer Science, Software Engineering or related field, 5+ years of experience as a Full Stack Engineer, Strong knowledge of data structures and algorithms, Proficiency in React, Proficiency in JavaScript, Proficiency in Python, Experience with FastAPI, Flask or Django, Knowledge of SQL Server, Snowflake and PostgreSQL, Understanding of RESTful APIs, Proficiency in Git, Experience developing scalable web applications, Ability to troubleshoot and debug backend systems, Strong collaboration and communication skills 📃 Skills: React, JavaScript, Python, FastAPI, Flask, Django, SQL, SQLServer, Snowflake, PostgreSQL, REST, Git, MongoDB, Redis, AWS, Azure, GCP, Docker, Kubernetes, Cursor, Claude, Codex 🏢 Description: We are seeking a skilled and versatile Senior Full Stack Engineer to join our dynamic development team, combining strong programming and data management expertise with familiarity with financial instruments. You will design, develop and maintain end-to-end software applications and systems, from frontend to backend, leveraging a modern technology stack to build scalable and high-quality solutions within the financial industry domain. Responsibilities Design, implement and optimize responsive, user-friendly web interfaces using the latest UI/UX technologies Develop and maintain server-side components of software applications Monitor and optimize performance, scalability and reliability of backend systems Collaborate with cross-functional teams including data engineers, product managers and designers to ensure seamless integration of frontend and backend components Write clean, efficient and well-documented code following best practices and coding standards Use AI coding agents such as Cursor, Claude Code and Codex Build and optimize database structures and queries for efficient data storage and retrieval Perform thorough testing and debugging to identify and resolve issues or bottlenecks Stay updated with industry trends and propose improvements to backend architecture and development processes Participate in code reviews to maintain code quality and mentor junior developers Partner with DevOps engineers to deploy and maintain applications in production environments Provide technical guidance and support to team members as needed Requirements Bachelor's or Master's degree in Computer Science, Software Engineering or a related field 5+ years of experience as a Full Stack Engineer developing scalable web applications, with strong proficiency in computer science fundamentals such as data structures and algorithms Proficiency in React, JavaScript and Python Experience with FastAPI, Flask or Django Knowledge of relational databases such as SQL Server, Snowflake and PostgreSQL Background in the Financial Industry or curiosity to learn and engage in Private Equity/Credit business domains Understanding of RESTful API design principles and experience building and consuming APIs Proficiency in Git and collaborative development workflows Strong problem-solving skills and ability to troubleshoot and debug complex backend issues Excellent communication and collaboration skills with the ability to work effectively in a team environment Nice to have Familiarity with NoSQL databases like MongoDB or Redis Knowledge of Accounting or Advent Geneva Understanding of Data Engineering tools and platforms such as data pipelines and data lakes Experience with cloud platforms like AWS, Azure or Google Cloud Platform and containerization technologies like Docker or Kubernetes Experience in bank loans/leveraged loans, fixed-income products, CLOs, derivatives, ABS and CMBS products We offer We gather like-minded people: Top tech minds driving innovation in AI, cloud and digital platform modernization Supportive team and agile, startup-like culture Hybrid by design mode and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Career development programs Thought leadership, mentoring, soft skills and well-being programs Certification (Anthropic, Gemini, GCP, Azure, AWS) English classes We cover it all: Stable pay Participation in the Employee Stock Purchase Plan with a 15% discount Benefits package (health insurance, multisport, shopping vouchers) Referral bonuses up to $2,000 Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more Corporate, social and well-being events Please, note: Benefits listed above are available to employees only We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually We will reach out to selected candidates exclusively EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.