Freelance Software Engineer

Freelance Software Engineer

Posted Today by Twine

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Negotiable
Undetermined
Remote
United Kingdom
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Amazon Web Services (AWS) Application Programming Interface (API) Automation Azure Kubernetes Service Blockchain Cloud Computing Cloud Technology Containerisation Continuous Integration and Continuous Delivery Database Design Docker (Software) FastAPI Full Stack Development Github Google Cloud Platform (GCP) Infrastructure as Code (IaC) Infrastructure Automation Kubernetes PostgreSQL Python (Programming Language) React.js Relational Databases Scalability Terraform TypeScript Workflows

Summary: A U.S.-based company is looking for a founding senior full stack engineer to lead the architecture and development of AI-powered services. This fully remote contract role focuses on backend and frontend development, particularly integrating advanced AI/ML systems. The engineer will collaborate with the founding team to design and scale core products over a delivery window of 3–4 months, with potential for long-term collaboration.

Key Responsibilities:

  • Lead the design and implementation of scalable backend systems using Python and FastAPI.
  • Develop user-friendly frontends with React and TypeScript.
  • Integrate AI/ML models and APIs (OpenAI, Anthropic) into production-ready pipelines.
  • Design and optimize prompt engineering and Retrieval-Augmented Generation (RAG) pipelines.
  • Manage containerization, deployment, and orchestration using Docker and Kubernetes.
  • Optimize relational databases, particularly PostgreSQL, for performance and scalability.
  • Ensure robust security practices are implemented across the tech stack.
  • Collaborate with founders to translate product vision into technical execution.
  • Implement CI/CD pipelines with GitHub Actions and infrastructure as code via Terraform.
  • Contribute to blockchain notarization workflows and other advanced integrations as required.

Key Skills:

  • Strong professional experience in backend development with Python and FastAPI.
  • Proven track record of building and deploying full stack applications with React and TypeScript.
  • Solid understanding of AI/ML integration, including LLM APIs, LangChain, and custom pipelines.
  • Experience designing prompt strategies and RAG architectures.
  • Hands-on knowledge of cloud platforms (AWS or GCP) and infrastructure automation.
  • Proficiency with Docker, Kubernetes, Terraform, and CI/CD best practices.
  • Expertise in database design and PostgreSQL optimization.
  • Familiarity with blockchain notarization or willingness to learn.
  • Strong communication skills and ability to collaborate closely with founders.
  • Capacity to deliver high-quality, scalable solutions within 3–4 months.

Salary (Rate): undetermined

City: undetermined

Country: United Kingdom

Working Arrangements: remote

IR35 Status: undetermined

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

A U.S.-based company is seeking a founding senior full stack engineer to take ownership of architecture and development for AI-powered services. This role requires expertise across backend and frontend development, with a strong focus on integrating advanced AI/ML systems. You will work directly with the founding team to design, build, and scale core products such as SEC Pulse, Industry Lens, Evidence Builder, and Compliance Watchdog. This contract role is fully remote, with an expected delivery window of 3–4 months and the potential for long-term collaboration.

Responsibilities

  • Lead the design and implementation of scalable backend systems using Python and FastAPI.
  • Develop user-friendly frontends with React and TypeScript.
  • Integrate AI/ML models and APIs (OpenAI, Anthropic) into production-ready pipelines.
  • Design and optimize prompt engineering and Retrieval-Augmented Generation (RAG) pipelines.
  • Manage containerization, deployment, and orchestration using Docker and Kubernetes.
  • Optimize relational databases, particularly PostgreSQL, for performance and scalability.
  • Ensure robust security practices are implemented across the tech stack.
  • Collaborate with founders to translate product vision into technical execution.
  • Implement CI/CD pipelines with GitHub Actions and infrastructure as code via Terraform.
  • Contribute to blockchain notarization workflows and other advanced integrations as required.

Skills and Requirements

  • Strong professional experience in backend development with Python and FastAPI.
  • Proven track record of building and deploying full stack applications with React and TypeScript.
  • Solid understanding of AI/ML integration, including LLM APIs, LangChain, and custom pipelines.
  • Experience designing prompt strategies and RAG architectures.
  • Hands-on knowledge of cloud platforms (AWS or GCP) and infrastructure automation.
  • Proficiency with Docker, Kubernetes, Terraform, and CI/CD best practices.
  • Expertise in database design and PostgreSQL optimization.
  • Familiarity with blockchain notarization or willingness to learn.
  • Strong communication skills and ability to collaborate closely with founders.
  • Capacity to deliver high-quality, scalable solutions within 3–4 months.

About Twine

Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally.

Our Mission

Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

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