Full Stack Developer

Titan OS; Barcelona; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Private health insurance

Central Barcelona location

International team

Job summary

Titan OS in Barcelona is seeking a passionate Full-Stack Developer to maintain and grow our online advertising platform built with React/Node.js and a PostgreSQL backend. You will work across the stack, implementing features, integrations, and authentication while ensuring reliability on a Replit-hosted production system.

Strong TS/React/Node skills and familiarity with modern web tooling are essential. Experience with Supabase Auth, Drizzle ORM, Vitest, Playwright, and CI/CD on Replit is

Qualifications

• 2+ years of full-stack development experience with TS/React/Node.js
• Experience with production applications including authentication, migrations or integrations
• Experience with Replit hosting, deployments, environments and secrets management
• Knowledge of PostgreSQL/SQL and Drizzle ORM or similar TS ORM
• Understanding of authentication (sessions, JWTs, OAuth, RBAC), preferably Supabase Auth
• Proficiency in HTML5, CSS and Tailwind CSS
• Experience writing automated tests (Vitest, Playwright)
• Awareness of web application security basics (OWASP Top 10)
• Experience integrating AI services or LLM APIs into production apps
• Nice to have: ad tech experience or VAST integrations

Responsibilities

• Design, code, test, maintain and deliver features across 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
• Write and maintain automated tests with Vitest, Playwright and Node.js tests
• Keep the platform secure: dependency updates, secrets management, input validation
• Manage deployments, environments and releases on Replit
• Document code and technical decisions for long-term maintainability

Skills

TypeScript

React

Node.js

Web security concepts

Tools

Replit hosting

Supabase Auth

Drizzle ORM

Vitest

Playwright

PostgreSQL

SQL

VAST (advertising)

Job description

Is this you?

Titan Operating System S.L. (Titan OS), the Barcelona-based technology, entertainment, and advertising company, is looking for you!

Our platform combines content discovery and advertising technology in one solution, helping leading TV brands unlock greater value. Titan OS powers devices from major brands including Philips, AOC and JVC, reaching millions of viewers across Europe and LATAM. Titan OS is also powering free premium FAST Channels on selected SONY Android TVs.

Over the last two years, Titan OS has grown revenue 10x and attracted leading investors, including Highland Europe and Mangrove.

At TitanOS, we live by three core values:

• Make things happen - We take ownership, move fast, and deliver impact
• No ego - We collaborate with respect and humility to reach shared goals
• Show genuine passion - We love what we do and never stop learning

Culture and environment are at the heart of our ethos. If the above resonates with you, keep reading because we believe you could be a perfect addition to our incredible team!

Role Overview:

As a Full-Stack Developer, you will help maintain and grow our advertising platform, which is developed and hosted on Replit. You'll work across the whole stack, from the React front end to the Node.js API and PostgreSQL database. You'll help keep a live production system secure and reliable while delivering new features and integrations.

Key Responsibilities

• Design, code, test, maintain and deliver features across the React front end and the Node.js/Express API
• Build and maintain integrations with third-party APIs and services
• Investigate and fix production bugs, find the root cause 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
• Keep the platform secure: dependency updates, secrets management, input validation and access control
• Manage deployments, environments and releases on Replit
• Document code and technical decisions so the platform stays easy to maintain

• 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 integration AI services or LLM APIs into production applications
• Nice to have: Experience with advertising technology or integrating ad platforms (VAST)

Reasons to apply:

• 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.
• Change the future of TV! A unique opportunity to join a well-funded, high-growth company in the early stages to help shape a product/business that will impact millions.