Senior Software Developer, Team Lead

About Onetag

Founded in 2015, Onetag is the next-generation value exchange for the open internet, combining quality media and AI-driven decisioning to deliver measurable business outcomes at scale. Through direct integrations with more than 2,000 premium publishers worldwide, Onetag enables over 5,000 brands and agencies to reduce waste and achieve better results, without adding operational complexity. Since 2022, Onetag has been part of the Wisequity V portfolio, managed by Wise Equity SGR S.p.A.

About the Role

We are looking for a Senior Software Developer , Team Lead to guide the team responsible for designing, building, and scaling a brand‑new cloud‑native application that powers a core part of our operations.

This platform enables the selection of premium inventory from 2,000+ direct publishers and provides a unified interface for internal teams and global clients to manage campaigns, users, reporting, billing, and payments.

As Team Lead , you will act as the strategic and technical leader of the group, driving architecture, delivery, roadmap, and long‑term product direction.

You will oversee the end‑to‑end development of the platform, ensuring high engineering standards, seamless integration with surrounding systems, and a future‑proof cloud architecture leveraging technologies such as Spring Boot, Angular, and AWS.

This is a mission‑critical leadership role with strong cross‑functional exposure and impact across the entire organization.

We’re looking for a leader who embodies our core values, collaboration, innovation, wellbeing, ownership, and who can deliver impact through clarity, accountability, and strong technical direction.

About the Team

The User Console Exchange Team owns the user-facing platform that manages configurations, access logic, user permissions, and interfaces used by both internal stakeholders and global clients.

The team collaborates closely with Infrastructure, Data, Product, and other engineering teams to deliver a reliable, scalable, and secure system.

As Team Lead , you will foster a culture of technical excellence, autonomy, transparent communication, and high collaboration, ensuring alignment across departments.

What You’ll Do

Leadership & Strategy

• Own the technical vision and roadmap for the User Console Exchange platform.
• Translate business goals into a clear engineering strategy, prioritizing initiatives based on impact and feasibility.
• Lead the transition toward a robust, scalable, cloud‑native architecture.

Team Management

• Lead, mentor, and grow a team of back‑end and front‑end developers.
• Establish processes and best practices to ensure high performance, ownership, and continuous improvement.
• Support hiring, onboarding, and capability development within the team.

Technical Ownership

• Provide guidance on architectural decisions and ensure adherence to engineering standards.
• Oversee the design and implementation of high‑performance, secure, and resilient features.
• Advocate for clean architecture, modularity, and maintainability across the codebase.

Cross‑Functional Collaboration

• Work closely with Product to define priorities, scope, and release plans.
• Collaborate with Infrastructure, Data, and other engineering teams to ensure seamless integrations.
• Communicate progress, risks, and dependencies to stakeholders and leadership.

Delivery & Quality

• Ensure predictable and timely delivery through effective planning and Agile methodologies.
• Promote best practices in testing, code reviews, CI/CD, documentation, reliability, and incident management.
• Monitor system performance and guide optimization efforts.

What You Bring

• Degree in Computer Engineering, Computer Science, or a related field.
• 5+ years of software engineering experience , with 2+ years in technical leadership or team management .
• Proven experience guiding teams through the evolution of complex systems (modularization, refactoring, microservices).
• Strong expertise with Spring Boot, Angular , and relational databases.
• Experience architecting or overseeing cloud‑based solutions (AWS preferred).
• Excellent communication skills and a solid command of English (B2+).
• A proactive, autonomous leadership style with strong alignment, coordination, and problem‑solving skills.
• Ability to collaborate effectively in cross‑functional, fast‑moving environments.

Nice to Have

• Experience in AdTech / Programmatic Advertising or data‑intensive platforms.
• Strong understanding of Agile/SCRUM frameworks and modern software delivery practices.
• Experience scaling engineering teams or maturing engineering processes.

What you will get:

• Flexible and hybrid working options (2 days in office + 3 days working from home)
• Ticket restaurants of 10 euro/day
• A supportive and collaborative working environment
• The opportunity to start your career in a dynamic, globally connected company, gaining hands-on experience and growing within an international environment

OneTag is proud to be an equal opportunity workplace: we are committed to equal opportunity for all applicants and employees regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion, or belief, and marriage and civil partnerships. If you have a disability or special need that requires accommodation during the application process, please let us know.

If Onetag sounds like your ideal company, we'd love to hear from you!

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