Senior Fullstack Developer

Jobtailor; Amsterdam; On-site; EUR 70,000 - 110,000; Full time

Job summary

Jobtailor in Amsterdam is seeking a senior software engineer to build and improve modern web applications and backend services. You will work across frontend, backend and infra, collaborating with client teams and designers on delivery.

You will clarify requirements, drive delivery, and contribute to cloud environments, CI/CD, testing and production operations, while maintaining a hands-on, consultative approach and strong English communication.

Qualifications

• Experience in modern frontend development with TypeScript and React.
• Strong backend service development using Node.js, Java, Kotlin or Python.
• Experience shipping production-grade digital products and full delivery lifecycle.
• Ability to work with cloud environments, CI/CD, deployments and operations.
• Senior, consultative role with clients and stakeholders; strong English communication.

Responsibilities

• Building and improving modern web applications, backend services, APIs and data models.
• Working across frontend, backend and infrastructure depending on client needs.
• Helping clients choose suitable technologies, architecture and delivery approaches.
• Contributing to cloud environments, CI/CD pipelines, deployments and production operations.
• Debugging, testing, monitoring and improving production-grade systems.
• Collaborating with client tech teams, stakeholders, designers and other disciplines.
• Clarifying ambiguous requirements and turning them into working software.
• Taking responsibility for delivery while supporting the team.
• Using modern development practices, including AI-assisted tools and workflows.

Skills

TypeScript

React

Node.js

Java

Kotlin

Python

Frontend development

Backend development

CI/CD

English communication

Tools

Cloud platforms

Docker

CI/CD pipelines

Job description

Responsibilities

• Building and improving modern web applications, backend services, APIs and data models
• Working across frontend, backend and infrastructure depending on the needs of the client project
• Helping clients choose suitable technologies, architecture and delivery approaches
• Contributing to cloud environments, CI/CD pipelines, deployments and production operations
• Debugging, testing, monitoring and improving production‑grade systems
• Working on products or tooling related to customer‑facing services, internal platforms, identity, martech, customer support, analytics, content, online stores, integrations, developer tooling or SDKs
• Collaborating directly with client tech teams, business stakeholders, designers, product people and other disciplines
• Clarifying ambiguous requirements and turning them into working software
• Taking responsibility for delivery while making sure the team is supported and no one is left behind
• Using modern development practices, including openness to AI‑assisted development tools and workflows

Requirements

• Strong experience in modern frontend development, for example with TypeScript and React or comparable technologies
• Strong experience in backend service development, for example with Node.js, Java, Kotlin, Python or comparable technologies
• Experience building, shipping and improving production‑grade digital products
• Comfortable working across the full delivery lifecycle, from implementation to testing, deployment and production operations
• Understanding of cloud environments, CI/CD, deployments and how production systems are operated
• Ability to work directly with clients, stakeholders and other disciplines in a senior, consultative role
• Strong problem‑solving skills and the ability to bring clarity to ambiguous product or technical situations
• A hands‑on mindset — you are technically credible, actively contribute to the work and help the team move forward
• Fluent verbal and written English skills to collaborate in an international environment