Fullstack JavaScript Engineer (Contract)
Posted 3 days ago by TRIBES
Negotiable
Undetermined
Remote
United Kingdom
Summary: The role of Senior Full-Stack JavaScript Engineer involves contributing to a high-velocity greenfield SaaS project for a top global company, focusing on YouTube advertising workflows. The position requires expertise in both frontend and backend technologies, with a strong emphasis on delivering production-ready code in a fast-paced environment. The engineer will work remotely and collaborate with various teams to ensure high-quality outcomes. The engagement is a full-time contract lasting approximately 11 weeks, including a build phase and subsequent QA and maintenance.
Key Responsibilities:
- Develop frontend features using React, TypeScript, and Next.js, ensuring compliance with WCAG 2.1 AA accessibility standards.
- Build and maintain backend services in Node.js, including secure and well-structured REST APIs.
- Deploy and operate services using GCP (Cloud Run, Cloud Build, Secret Manager, Monitoring/Logging).
- Contribute to architecture decisions for a scalable, secure, and high-availability platform.
- Collaborate closely with Tribes and the client’s teams to refine requirements and deliver high-quality outcomes within tight deadlines.
- Support QA, debugging, and performance optimizations during and after the initial build.
- Ensure engineering best practices including code reviews, documentation, and adherence to accessibility and security standards.
Key Skills:
- Frontend: React, TypeScript, Next.js, WCAG 2.1 AA accessibility compliance.
- Backend: Node.js, REST API development.
- Google Cloud Platform: Cloud Run, Cloud Build, Secret Manager, Cloud Monitoring & Logging.
- Nice to Have: Testing & Quality (Playwright, axe-core), Infrastructure & DevOps (VPC networking, GCP Artifact Registry, Terraform, CI/CD pipelines), Security scanning (SAST/DAST), Data & Caching (Redis, PostgreSQL), Advertising & Domain Knowledge (DV360, YouTube campaign management, programmatic advertising concepts, OAuth2/OIDC, Okta).
Salary (Rate): undetermined
City: undetermined
Country: United Kingdom
Working Arrangements: remote
IR35 Status: undetermined
Seniority Level: undetermined
Industry: IT
Duration: Initial 9-week build (1 Dec 2025 – 6 Feb 2026), followed by ~2 months of QA & maintenance
Engagement: Full-time contract
Location: Fully remote — remote means anywhere
Working Hours: UK collaboration hours (9:00–17:00 UK time)
Overview
The client seeks an experienced Senior Full-Stack JavaScript Engineer to join a high-velocity greenfield SaaS build. The role involves working with Tribes and the client on a confidential project (under NDA) for one of the world’s top 10 global companies. The engineer will help deliver a new platform that streamlines DV360 campaign creation and management, with a strong emphasis on YouTube advertising workflows. The solution integrates deeply with Google APIs, GCP services, and Structured Data Files (SDF). This is a hands-on role for someone who thrives in fast-paced delivery environments and can produce production-ready code from day one.
Key Responsibilities
- Develop frontend features using React , TypeScript , and Next.js , ensuring full compliance with WCAG 2.1 AA accessibility standards.
- Build and maintain backend services in Node.js , including secure and well-structured REST APIs .
- Deploy and operate services using GCP (Cloud Run, Cloud Build, Secret Manager, Monitoring/Logging).
- Contribute to architecture decisions for a scalable, secure, and high-availability platform.
- Collaborate closely with Tribes and the client’s teams to refine requirements and deliver high-quality outcomes within tight deadlines.
- Support QA, debugging, and performance optimizations during and after the initial build.
- Ensure engineering best practices including code reviews, documentation, and adherence to accessibility and security standards.
Required Skills & Experience
- Frontend React + TypeScript Next.js WCAG 2.1 AA accessibility compliance
- Backend Node.js REST API development Google Cloud Platform Cloud Run Cloud Build Secret Manager Cloud Monitoring & Logging
Nice to Have
- Testing & Quality Playwright axe-core for accessibility testing
- Infrastructure & DevOps VPC networking GCP Artifact Registry Terraform (IaC) CI/CD pipelines Security scanning (SAST/DAST)
- Data & Caching Redis / Memorystore PostgreSQL / Cloud SQL
- Advertising & Domain Knowledge DV360 or other advertising platforms YouTube campaign management Programmatic advertising concepts Authentication OAuth2 / OIDC Okta
Project Timeline
Phase 1: 1 December 2025 – 6 February 2026 (9 weeks, fast-paced delivery)
Phase 2: ~2 months of QA and maintenance
Interview Process
Submit CV via Tribes website
HR interview
Technical interview
Technical assessment
Final offer
About the Client
The role is delivered in partnership with Tribes for the client , a globally recognised organisation ranked among the world’s top 10 companies. All client details remain confidential, and the project is fully under NDA.
Diversity, Equity & Inclusion
Tribes is committed to fostering a diverse, equitable, and inclusive environment. We welcome applicants from all backgrounds, experiences, and perspectives, and we ensure fair and unbiased hiring practices throughout the process.