Senior Back-end Engineer

Flutter International plc; Athens (GA); Hybrid; USD 120.000 - 160.000; Vollzeit

Zusammenfassung

Flutter International plc is seeking a Senior Node.js Engineer to design, develop, and optimize scalable backend services powering our Martech stack. You will work with Node.js, NestJS, and TypeScript in a microservices architecture, owning technical decisions and mentoring teammates across Frontend, DevOps, QA, and Product groups.

This role emphasizes performance, security, and reliability with AWS, Docker, Kubernetes, and CI/CD, in a hybrid work environment.

Qualifikationen

• 4+ years of backend development with Node.js.
• Strong, hands-on experience with NestJS and TypeScript in production.
• Solid understanding of microservices architecture and distributed systems.
• Proven experience designing and implementing RESTful APIs.
• Knowledge of authentication/authorization mechanisms (JWT, OAuth).
• Experience with relational and/or NoSQL databases.
• Event-driven architecture understanding; experience with Kafka/RabbitMQ.
• Hands-on experience with AWS services in production.
• Docker and Kubernetes for containerized workloads.
• Understanding of CI/CD processes and automation.
• Familiarity with system design principles and patterns.
• Strong analytical thinking and problem solving.
• Ownership and accountability from design to production.
• Strong communication and mentoring mindset.
• Proactive in continuous improvement and cross-team collaboration.
• Ability to work in a hybrid environment with English (B2+).

Aufgaben

• Design and develop backend services using Node.js, NestJS, and TypeScript.
• Build and operate microservices with clear boundaries and contracts.
• Design RESTful APIs and inter-service communication.
• Contribute to architectural decisions and solution design.
• Integrate with external APIs and third-party platforms.
• Ensure performance, reliability, and security of backends.
• Work with AWS and cloud-native services.
• Develop containerized apps with Docker and Kubernetes.
• Contribute to CI/CD pipelines and deployment processes.
• Troubleshoot production issues and improve observability.
• Collaborate with Frontend, DevOps, QA, and Product.
• Mentor junior and mid engineers and promote best practices.
• Communicate decisions clearly to stakeholders.
• Drive continuous improvement and tackle blockers proactively.

Kenntnisse

Node.js

NestJS

TypeScript

Microservices

REST APIs

JWT/OAuth

AWS

Docker

Kubernetes

CI/CD

System Design

Observability

Communication

Mentoring

Tools

Docker

Kubernetes

AWS

Jobbeschreibung

Job Aim / Main Assignment

As a Senior Node.js Engineer in our Martech Tribe, you will design, develop, and optimize scalable backend services that power our marketing technology stack. Working primarily with Node.js, NestJS, and TypeScript within a microservices-based architecture, you will deliver high-quality, secure, and maintainable solutions that support internal applications used across multiple markets. The role requires strong technical ownership, sound architectural judgment, and close collaboration with Frontend, DevOps, QA, and Product teams. As a senior member of the team, you will also mentor others and contribute to raising the overall engineering bar.

Your responsibilities will include:

• Design and Develop Backend Services: Build robust backend services using Node.js, NestJS, and TypeScript, ensuring code quality, maintainability, and long-term scalability.
• Build and Maintain Microservices: Design, develop, and operate microservices-based architectures, while also supporting monolithic services where required, with clear boundaries, well-defined contracts, and resilient communication patterns.
• Design REST APIs and Service Communication: Design and implement RESTful APIs and internal service-to-service communication, applying sound API design principles, versioning strategies, and clear contracts for consumers.
• Contribute to Architectural Decisions: Actively participate in architectural discussions and technical solution design, helping shape the evolution of the tribe's backend systems and ensuring alignment with broader engineering guidelines.
• Integrate Third-Party Services: Integrate with external APIs and third-party platforms relevant to the Martech domain, handling authentication, rate limits, error handling, and data consistency reliably.
• Ensure Performance, Reliability & Security: Take ownership of the performance, scalability, reliability, and security of backend systems, applying best practices around authentication/authorization, data protection, and resilience.

Cloud, Infrastructure & Delivery

• Work With AWS and Cloud-Native Services: Build and operate services on AWS infrastructure, leveraging cloud-native capabilities to deliver scalable, cost-effective, and resilient solutions.
• Develop Containerized Applications: Develop and maintain containerized applications using Docker and Kubernetes, ensuring consistent runtime behavior across environments and smooth deployment workflows.
• Contribute to CI/CD Pipelines: Contribute to CI/CD pipelines and deployment processes, ensuring changes are tested, automated, and shipped safely and predictably.
• Troubleshoot Production Issues: Investigate and resolve complex production issues, identify root causes, and drive long-term improvements to system performance, observability, and stability.

Code Quality & Engineering Practices

• Write Clean, Maintainable Code: Produce well-structured, documented, and testable code that adheres to the team's coding standards and is easy for others to read, extend, and operate.
• Conduct Code Reviews: Conduct thorough, constructive code reviews and contribute to continuously improving engineering standards, patterns, and tooling within the team.
• Apply System Design Best Practices: Apply system design principles and best practices in everyday work, balancing simplicity, performance, and maintainability when proposing or implementing solutions.
• Champion Testing: Support a strong testing culture by writing appropriate unit, integration, and contract tests, and by helping ensure that backend services are well-covered and reliable.

Collaboration, Mentoring & Communication

• Collaborate Across the Tribe: Work closely with Frontend, DevOps, QA, and Product teams to deliver features end-to-end, ensuring backend services meet real product and integration needs.
• Mentor Other Engineers: Mentor junior and middle engineers, share knowledge generously, and actively support the technical growth of the team through pairing, design discussions, and reviews.
• Articulate Technical Decisions: Communicate technical decisions clearly to both technical and non-technical stakeholders, explaining trade-offs and the reasoning behind chosen approaches.
• Drive Continuous Improvement: Bring a proactive mindset to identifying improvements in code, architecture, processes, and tooling, and help turn those ideas into concrete changes.
• Raise Issues Early: Communicate blockers, risks, or concerns proactively to the Team Lead and Scrum Master so the team can adapt quickly and keep delivery on track.

What We're Looking For:

• 4+ years of experience in backend development with Node.js.
• Strong, hands‑on experience with NestJS and TypeScript in production environments.
• Solid understanding of microservices architecture and distributed systems, including their typical challenges (consistency, observability, failure modes).
• Proven experience designing and implementing RESTful APIs.
• Solid knowledge of authentication and authorization mechanisms (JWT, OAuth, session‑based auth, etc.).
• Experience working with relational and/or NoSQL databases, including data modeling, querying, and performance considerations.
• Understanding of event‑driven architecture and experience with message brokers (e.g., Kafka, RabbitMQ, or similar).
• Hands‑on experience with AWS services in a production setting.
• Strong experience with Docker and Kubernetes for building and operating containerized workloads.
• Understanding of CI/CD processes and experience integrating backend services into automated delivery pipelines.
• Familiarity with system design principles, best practices, and common architectural patterns.
• Strong analytical thinking and problem‑solving skills, with the ability to break down complex problems into clear, manageable solutions.
• Ownership and accountability for assigned tasks, from design through to production.
• Strong communication skills and the ability to articulate technical decisions clearly.
• Mentoring mindset and willingness to support the growth of other engineers in the team.
• Proactive attitude and a continuous improvement mindset.
• Ability to collaborate effectively across teams in a hybrid work environment.
• English level: B2 or higher (written and spoken).

Bonus Points For:

• Experience in Martech (marketing automation, CDPs, personalization platforms, analytics tooling, A/B testing, tag management, or similar).
• Experience building backend systems for internal tools and platforms used by multiple teams or markets.
• Experience with infrastructure‑as‑code (e.g., Terraform, CloudFormation).
• Experience with observability tooling (logging, metrics, tracing) and incident response.
• Experience with additional cloud platforms (Azure, GCP) or hybrid setups.
• Experience working in a Tribe‑based organizational structure.