Senior/Lead Full-Stack Developer (Acting Lead / Ownership Role)

About the Position

We're seeking a Senior/Lead Full-Stack Developer with 6+ years of experience to take full ownership of an AI/data platform in its final pre-launch phase. You'll step in as the acting tech lead, resolve architectural gaps, and drive the product to a stable, releasable state.

Responsibilities

• Own overall product health: system stability, performance, and release readiness
• Conduct architectural audits to identify root causes of recurring issues
• Streamline development processes to make progress more predictable
• Write mission-critical code - especially in AI integrations and complex data processing
• Lead and mentor a team of engineers through the final stage of delivery

The Tech Stack

• Backend: Python (FastAPI), complex API development
• Frontend: React, Next.js, TypeScript
• Data: Postgres, vector DB (RAG workflows), graph DB, S3
• AI/LLM: OpenAI, LangChain/LangGraph, RAG approaches
• Infrastructure: AWS, Terraform, Boto3

The Environment

The platform operates at the intersection of web scraping, AI data processing, and complex relationship modeling. The team is expanding and this role is the architectural anchor for launch. If you’ve stabilized ambiguous codebases under deadline pressure and you prefer ownership over tickets, we want to talk.

Requirements

• 6+ years in full-stack development with a strong focus on Python and modern frontend frameworks
• Practical experience with LangChain/LangGraph and building RAG systems
• Understanding of scraping-heavy systems and experience working with diverse databases - vector, graph, relational
• Proven experience in team management or technical mentoring
• Ability to integrate quickly into an existing team and implement changes confidently yet collaboratively
• Professional English for direct client communication and technical leadership

We Offer

• Direct client access - work straight with technical decision-makers, no PM or agency layer in between
• Long-term engagements with well-funded SaaS and regulated-enterprise clients
• Senior-only environment - every peer has 5+ years and a track record we've vetted
• Real production AI work on modern stacks - not legacy maintenance or POC theater
• Fully remote, flexible hours, B2B contractor model with transparent rates
• Growth path into tech-lead and architect roles on multi-year client engagements

About the Company

Insoftex is a company that operates in Tallinn, Estonia, and Austin, Texas. We are currently looking for candidates who can work remotely.

Application

Send your application to [email protected]. We'll be in touch within a few business days.