Senior Full Stack Developer (Contractor)

About us:

Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients.  Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.

The Role

We are seeking a Senior Full Stack Developer to join our growing team. This is a high-impact, high-ownership role where you’ll work across the full stack, from backend APIs and infrastructure to frontend interfaces and dashboards. You’ll collaborate closely with the founder and engineers on architecture, scaling, performance, and product delivery.

Tech Stack

• Frontend: React 19, TypeScript, Vite, Tailwind CSS, Zustand, Recharts, Mapbox GL
• Backend: Python 3.11, FastAPI, SQLAlchemy, Celery, Redis, Pydantic
• Database: PostgreSQL, Redis
• Infrastructure: AWS (EC2, S3), Docker, GitHub Actions
• AI / LLMs: DeepSeek, Anthropic Claude, OpenAI
• Data: Parquet, GeoJSON, mbtiles, Athena

Key Responsibilities:

• Design and build APIs using Python (FastAPI), including database schema management (PostgreSQL) and task queue optimization with Celery
• Architect multi-tenant SaaS features: authentication, data isolation, billing integration
• Develop and maintain complex frontend components using React 19, TypeScript, Tailwind CSS, Zustand
• Integrate AI/LLM providers (e.g., DeepSeek, Claude, OpenAI) into backend pipelines
• Build data dashboards and interactive UIs for ad analysis, scoring, and geographic mapping
• Manage DevOps processes via Docker, GitHub Actions, and AWS infrastructure
• Optimize Celery-based pipelines for high-parallelism and sequencing of LLM calls
• Participate in code reviews, documentation, and technical decisions with the founding team

Required Skills:

• 5+ years of professional software development experience
• 3+ years working with Python (FastAPI or Django)
• 3+ years working with React and TypeScript
• Strong SQL skills (especially PostgreSQL)
• Experience building RESTful APIs and multi-tenant SaaS applications
• Familiarity with Git and CI/CD workflows
• Experience with async Python (asyncio, Celery)
• Comfortable communicating in English (written and verbal)
• Available to overlap 4+ hours with US Eastern time (9am-1pm ET or 2pm-6pm ET)

Strongly Preferred Skills:

• Experience integrating LLMs or AI APIs
• Experience with async Python (asyncio, Celery)
• Experience building multi-tenant SaaS applications
• Redis for caching or background tasks
• Docker and cloud platform experience (AWS or GCP)
• Prior experience in startups or small teams

Nice-to-have skills:

• Stripe/payment integration
• Data visualization (Recharts, D3, etc.)
• Geographic data (Mapbox, mbtiles, etc.)
• Background in SaaS, AdTech, or political/analytics tooling

What we offer:

• Fully remote engagement across LATAM.
• Opportunity to work on high-impact client systems with real operational ownership.

Employment type:

• Contract

Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR