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Reaktor

Senior Fullstack Developer

Reaktor

. Building and improving modern web applications, backend services, APIs and data models .

Posted 7/3/2026full-timeLisbon • 🇵🇹 PortugalSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates strong expertise in modern frontend and backend development, utilizing technologies such as TypeScript, JavaScript, React, Node.js, and Python. Proficient in cloud environments, CI/CD practices, and delivering production-grade digital products while effectively collaborating with clients and stakeholders.

Highest-signal resume keywords
Frontend Development with TypeScript and JavaScriptBackend Service Development with Node.js and PythonCloud Environments and CI/CD PracticesProduction-Grade Digital Product DeliveryClient and Stakeholder Collaboration

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Frontend DevelopmentBackend DevelopmentAPI DevelopmentData ModelingProduction Quality AssuranceDebuggingTestingMonitoringDeploymentDigital Product Improvement
Soft Skills
Problem-SolvingCollaborationConsultative CommunicationClarity in Ambiguous SituationsHands-On Mindset
Tools & Technologies
ReactNode.jsJavaKotlinScalaClojurePythonCI/CD ToolsCloud PlatformsAI-Assisted Development Tools
Industry Keywords
Web ApplicationsBackend ServicesAPIsCloud EnvironmentsCustomer-Facing ServicesInternal PlatformsMartechAnalyticsIntegrationsDeveloper Tooling

Tech Stack

Tools & technologies
ClojureCloudJavaJavaScriptKotlinNode.jsPythonReactScalaTypeScript

About the role

Key responsibilities & impact
  • 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 quality
  • 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, 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

What you’ll need
  • Strong experience in modern frontend development, for example with TypeScript, JavaScript, React or comparable technologies
  • Strong experience in backend service development, for example with Node.js, Java, Kotlin, Scala, Clojure, 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 quality
  • 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.

Benefits

Comp & perks
  • Willingness to work in a hybrid setup. This means balancing office, client premises and remote work depending on the client project and team needs.