Source Job

EMEA

  • Design and maintain FastAPI backend services powering the data collection and delivery pipeline
  • Build and iterate React interfaces for internal teams, contributors, and clients
  • Architect AI-powered pipelines for quality assurance, classification, and dataset delivery

Python FastAPI React SQL PostgreSQL

20 jobs similar to Founding Engineer

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Global

  • Collaborate with product management and stakeholders to deliver SaaS solutions.
  • Design, develop, and maintain backend services using Python and FastAPI for agentic workflows.
  • Contribute to developing multi-agent systems and integrate agents with third-party tools.

Granicus is dedicated to transforming the Govtech industry by uniting governments and constituents through technology. They offer cloud-based solutions for communications, website design, meeting management, and digital services, empowering stronger relationships between government and residents. The company has 5,500 federal, state, and local government agency customers.

Global

  • Design and build full-stack applications combining modern frontend technologies with Python-based backend services
  • Develop intuitive user interfaces and high-quality user experiences using React, JavaScript, and HTML
  • Prototype and deliver AI-powered applications leveraging large language models

Smart Working connects skilled professionals with global teams and products for full-time, long-term roles. They aim to match people in roles where they truly belong and value growth and well-being, empowering them to grow both personally and professionally.

Europe

  • Ship full-stack features end-to-end, owning the full lifecycle from conception to production with minimal oversight.
  • Build and maintain the infrastructure powering Fastino's services, keeping systems reliable and performant as we scale.
  • Work directly with AI researchers to bring new model capabilities into the product, moving fast without sacrificing quality.

Fastino is building the next generation of LLMs, developing specialized, efficient AI. The team, with alumni from Google Research, Apple, Stanford, and Cambridge, has raised $25M and is backed by leading investors including Microsoft and Github CEO Thomas Dohmke.

US

  • Assist in developing backend services and APIs primarily using Python within a microservices-based architecture.
  • Contribute to building web applications and dashboards using modern frontend frameworks such as React.
  • Help integrate AI and LLM-powered features into product workflows, including experimentation with prompts and backend integrations.

Impiricus is the first and only AI-powered HCP Engagement Engine, created to transform how life sciences companies support physicians. In 2025, Deloitte named Impiricus the #1 fastest-growing company in North America for their prestigious Fast 500 list.

$80,828–$118,814/yr
Europe

  • Design, build, and evolve our public API product to access Photoroom’s AI capabilities.
  • Ship features used by self-serve developers and large enterprise customers, ensuring reliability and scalability.
  • Own the API surface end-to-end: from design decisions to implementation and long-term maintainability.

Photoroom, launched in 2020 after Y Combinator, is the world's most popular AI photo editor. They aim to provide technology for creating studio-level product images quickly. They have over 100 employees and focus on craft, innovation, and collaboration.

Global

  • Participate in research and development activities for AI-driven documentation solutions
  • Take ownership of features from concept to implementation, including front-end development, AI components, and service integrations
  • Develop and maintain front-end applications using React (TypeScript, Vite preferred)

Sigma Software helps global ICT leaders. They value innovation, ownership, and collaboration, offering a flexible, remote environment and a supportive culture with professional growth opportunities.

US

  • Assist in building and maintaining backend services and APIs that support core product features.
  • Work with PostgreSQL databases to help model data, write queries, and support reliable data pipelines.
  • Help integrate AI and LLM-based capabilities into backend workflows, including prompt development and API integrations.

Impiricus is an AI-powered HCP Engagement Engine that ethically connects HCPs to pharma resources. They are named the #1 fastest growing company in North America by Deloitte with a unique access to the largest opted-in network of HCPs.

$405,000–$485,000/yr
US

  • Define and drive multi-year technical strategy for the Claude API.
  • Identify and personally lead the highest-complexity, highest-impact engineering initiatives spanning multiple teams.
  • Serve as the primary technical decision-maker for major architectural decisions with org-wide scope.

Anthropic's mission is to create reliable, interpretable, and steerable AI systems to be safe and beneficial for users and society. Their quickly growing team is composed of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

$35–$50/hr
Global

  • Design and implement LLM-powered application workflows
  • Architect retrieval-augmented generation pipelines
  • Collaborate with backend architects to integrate AI services into APIs

They are seeking a hands-on AI Engineer with deep expertise in Large Language Model integration and production AI systems. The company's culture sounds innovative and collaborative, focusing on building scalable and secure AI applications.

  • Lead the integration of modern, AI-generated applications with backend enterprise layers.
  • Design, document, and execute a robust CI/CD and release strategy.
  • Act as a high-EQ consultant to bridge the gap between our high-velocity delivery model and the client’s internal teams.

CompassX is a boutique business and technology consulting firm helping Fortune 500 and high-growth clients deliver their most strategic initiatives. With over 15 years of proven results, they've expanded across industries; they are a three-time winner of Consulting Magazine’s Best Boutique Firms to Work For.

$3,000–$3,300/mo
Latin America

  • Design and implement user-facing AI features across frontend and backend systems.
  • Build and evolve APIs and services that integrate AI models, data pipelines, and product workflows.
  • Translate product requirements and UX designs into high-quality, maintainable code.

Enumerate is focused on crafting AI-powered product features. They appear to be a tech company with a fast-paced, product-driven culture that values collaboration and innovation.

$100,000–$175,000/yr
US

  • Build and ship full stack features integrating frontend (Angular, Typescript) and backend (Node/Python).
  • Design and implement agentic workflows including tool-calling and multi-step reasoning pipelines.
  • Integrate and maintain connections to external services, data sources, and APIs for agent execution.

LMI accelerates government impact with innovation and speed, bringing commercial-grade platforms and mission-ready AI to federal agencies. They focus on agility and collaboration, serving the defense, space, healthcare, and energy sectors.

US Unlimited PTO

  • Architect and deploy autonomous AI agents and multi-agent workflows.
  • Design strict-source-following Retrieval-Augmented Generation (RAG) systems.
  • Build scalable backend services using FastAPI.

Osano is an innovative B-Corporation focused on giving modern enterprises the ability to innovate quickly and earn customer trust by respecting data privacy and complying with consent guidelines. We are scaling fast with a multi-year runway and ambitious growth plans.

$120,000–$150,000/yr
US

  • Develop and enhance our AI-powered learning platform using TypeScript/React on the frontend and Python/FastAPI on the backend.
  • Build responsive web applications for diverse learners across desktop and mobile.
  • Integrate Large Language Models for content classification, skill assessment, learner feedback, and personalization.

EnGen offers an AI-powered approach to English instruction, designed to solve a systemic access issue. A Certified B Corporation, EnGen partners with employers, adult educators, workforce development organizations, and state governments.

Global

  • Design, code, implement, and document improvements to a high standard
  • Design and develop robust, responsive web applications using React and modern JavaScript/TypeScript ecosystems
  • Build and maintain backend services that integrate with database systems and operational tooling

Percona provides open-source database software, support, and services. They have a collaborative, highly-engaged culture with a globally dispersed workforce in more than 50 countries.

US Unlimited PTO

  • Design, develop, and maintain end-to-end features for Cresta’s no-code processing platform.
  • Build intuitive UI components and visual editors for configuring conversation logic and workflows.
  • Architect and implement backend services and APIs to power a dynamic no-code interface.

Cresta's platform combines the best of AI and human intelligence to help contact centers discover customer insights and behavioral best practices, automate conversations and inefficient processes, and empower every team member to work smarter and faster. Cresta's co-founder and chairman is Sebastian Thrun, the genius behind Google X, Waymo, Udacity, and more.

Europe

  • Develop a strong understanding of Workera's AI-powered platform, customers, and business model.
  • Actively lead and deliver your first full project, owning backend architecture, build, and rollout end-to-end.
  • Architect and own backend systems that are robust, performant, and built to scale.

Workera is redefining how enterprises understand, develop, and mobilize talent in the age of AI. The company is a fast-growing, Series B Silicon Valley company building AI-native skill assessments for the world’s largest organizations, with clients including Samsung, Siemens Energy, and the U.S. Air Force.

$120,000–$140,000/yr
US Unlimited PTO

  • Design, build, and maintain web applications across the stack.
  • Collaborate with cross-functional teams to ship high-quality software.
  • Develop RESTful APIs using Python.

JBS is an equal opportunity employer that hires individuals authorized for employment in the United States on a W2 basis. They do not discriminate in hiring or terms and conditions of employment on the basis of any federal, state, or locally protected class.

Europe

  • Building scalable systems in an innovative environment.
  • Shaping the value we deliver to our customers.
  • Making architectural decisions that will hold up as we grow.

Dragonboat is a leading provider of an AI platform for Strategic Product and Portfolio Management. They are a venture-backed, fast-growing SaaS startup with remote teams in Portugal and the US.

US Canada Unlimited PTO

  • Collaborate closely with business stakeholders and other engineers to deliver impactful solutions.
  • Integrate services and product features with databases and messaging queues.
  • Contribute to the development of our MLOps tools for ML models.

Trellis is rewriting the insurance experience from the inside out. They are a profitable, fast-growing Series A startup backed by General Catalyst, QED, NYCA, and Amex Ventures that brings clarity and ease to insurance shopping.