Senior Developer – Backend

Senior Developer designing backend solutions for global brands at Merkle, driving technical innovation and team delivery.

Posted 5/24/2026full-timeLisbon • 🇵🇹 PortugalSeniorWebsite

Tools & technologies

MS SQL Server.NETSDLCSQLSSIS

Key responsibilities & impact

Lead technical decisions for new features, improvements, and architectural evolution, driving both team and client demands.
Act as the primary technical point of contact, balancing client-facing interactions with internal development guidance.
Contribute across the full SDLC: requirements, design, development, testing, documentation, and release, with a high degree of autonomy.
Ensure scalable, secure, maintainable, and high-quality backend solutions, optimized data flows, and robust reporting.
Own complex feature delivery and solve key technical and architectural challenges, especially within SQL Server and integration services.
Conduct code reviews, enforce coding standards, and promote best engineering practices.
Run technical ceremonies (Security & Quality gates, technical planning meetings) and manage project workflows.
Identify and execute technical Enablers and Proof-of-Concepts to foster continuous innovation.
Monitor system health, analyze performance, and support non-functional testing and automation scripts.
Mentor developers, lead training sessions, and support onboarding of new team members, driving technical excellence across the team.
Collaborate closely with Product Owners, Business Analysts, Architects, IT teams, and external partners, acting as a bridge between technical execution and client needs.

What you’ll need

Strong hands-on expertise in .NET / C# (.NET Web API, .NET Web Apps, and modern .NET Core versions).
Deep knowledge of the Microsoft SQL Server stack, including advanced SQL querying, SSIS (SQL Server Integration Services), and SSRS (SQL Server Reporting Services).
Proficiency in scripting and automation using PowerShell.
Experience with the Atlassian Suite (Jira, Confluence) for project tracking, documentation, and workflow management.
Solid experience in debugging, database performance optimization, and application security best practices.
Experience designing and maintaining scalable backend systems, APIs, and data integration pipelines.
Comfortable working in Agile environments (Scrum, SAFe).
Strong leadership and mentoring capability, with a proven track record of driving team delivery.
Excellent communication and client-facing skills, with the ability to confidently translate technical topics for business stakeholders and manage client expectations.
Highly autonomous and proactive problem-solver with strong attention to detail.
Curious mind and a fast learner, with a genuine passion for continuously absorbing new business logic and technologies.
Good collaborator, team player, and natural communicator.
Fluent English (spoken & written).

Comp & perks

Global Perspective: As part of a dentsu company, collaborate with over 70,000 talented colleagues across 145 countries to drive innovation on a global scale.
Flexibility & Balance: Enjoy hybrid work models, adaptable hours, and home office options.
Inclusive & Supportive Culture: We celebrate diversity and foster a respectful workplace where every team member’s unique perspective is valued, and everyone is welcome.
Well-balanced reward package: We offer competitive salaries, volunteer days, wellness days, modern offices, and a multi-cultural environment that fosters creativity and innovation.
Innovation-Driven Work: Contribute to projects that are reshaping industries and driving transformation with next-generation technologies and strategies.
Purpose-Driven Culture: Be part of an organization that fosters sustainable growth for brands, people, and society—where every contribution makes a meaningful impact.
Growth Opportunities: Expand your skills through training, mentorship, and data-driven projects that reshape customer experience and business outcomes.

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Hard Skills & Tools

.NETC#.NET Web API.NET Web Apps.NET CoreMicrosoft SQL ServerSQL queryingSSISSSRSPowerShell

Soft Skills

leadershipmentoringcommunicationproblem-solvingattention to detailcollaborationteam playerclient-facing skillsautonomycuriosity