Full Stack Developer

Titan OS

. Design, code, test, maintain and deliver features across the React front end and Node.js/Express API .

Posted 11/11/2026full-timeBarcelona • SpainJuniorMid-LevelWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack development with a focus on React and Node.js, including experience with authentication, database migrations, and third-party integrations. Proficient in maintaining platform security and writing automated tests to ensure application reliability.

Highest-signal resume keywords

Full-Stack DevelopmentReactNode.jsTypeScriptAutomated Testing

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

TypeScriptReactNode.jsPostgreSQLSQLDrizzle ORMHTML5CSSTailwind CSSVitest

Tools & Technologies

ReplitSupabasePlaywrightAPI IntegrationsDependency Management

Industry Keywords

Web Application SecurityAuthenticationDatabase MigrationsProduction ApplicationsAdvertising Technology

Tech Stack

Tools & technologies

JavaScriptNode.jsPostgresReactSQLTypeScript

About the role

Key responsibilities & impact

Design, code, test, maintain and deliver features across the React front end and Node.js/Express API
Build and maintain integrations with third-party APIs and services
Investigate and fix production bugs, identify root causes and prevent regressions
Maintain authentication and access control built on Supabase
Write and run database schema changes and migrations with Drizzle ORM safely and without data loss
Write and maintain automated tests with Vitest, Playwright and Node.js tests
Maintain platform security through dependency updates, secrets management, input validation and access control
Manage deployments, environments and releases on Replit
Document code and technical decisions to keep the platform maintainable

Requirements

What you’ll need

2+ years of relevant experience as a full-stack developer with TypeScript, React and Node.js
Experience working on production applications, ideally including authentication, database migrations or third-party integrations
Experience with Replit, including hosting, deployments, environments and secrets management
Working knowledge of PostgreSQL and SQL, and familiarity with Drizzle ORM or a similar TypeScript ORM
Understanding of authentication (sessions, JWTs, OAuth, role-based access), ideally with Supabase Auth
Good knowledge of HTML5, CSS and Tailwind CSS
Experience writing automated tests, ideally with Vitest and Playwright
Awareness of web application security basics (OWASP Top 10, secrets handling, dependency updates)
Experience integrating AI services or LLM APIs into production applications
Nice to have: Experience with advertising technology or integrating ad platforms (VAST)

Benefits

Comp & perks

Centrally located office in the heart of Barcelona, with public transportation nearby
Competitive compensation
Private health insurance
Friendly, diverse, and international work environment
Opportunity to work outside of your comfort zone and develop professionally in an exciting and fast-growing CTV industry
Opportunity to join a well-funded, high-growth company in its early stages and help shape a product/business impacting millions