Ezra is a venture-backed startup building at the intersection of sustainable finance and artificial intelligence. Our mission is to accelerate capital deployment to climate solutions and other world-positive investments. Finance is a huge lever we can pull to get more climate technology deployed in the world, and we believe our software platform can meaningfully accelerate progress. AI applications and agents are foundational to our suite of solutions. We move fast, stay close to our customers, experiment constantly, and believe in launching, learning, and iterating quickly. We're a small and experienced team.
About the Role
You’ll drive the architecture and scalability of backend systems while bringing strong AI integration skills. You will act as a technical leader who owns product features from inception to deployment, ensuring a seamless, high-quality experience for the end-user. You’ll bridge traditional backend services with AI inference systems, ensuring reliability and performance at production scale. Expect deep work across Python/Django/FastAPI, APIs, data stores, and AWS infrastructure, plus hands-on collaboration with AI/ML engineers to serve, evaluate, and iterate on model-powered features at scale. This role calls for a seasoned engineer (12+ years) with a strong track record leading architectural decisions and thriving in the high-autonomy environment of a small startup.
Core Responsibilities
•Own the technical delivery of full-stack product features, collaborating directly with Product Management and Design to define requirements, break down epics, and ensure engineering quality and speed.
•Lead design and development of Python-based backends powering the core web app (Django DRF or FastAPI experience preferred).
•Architect scalable APIs that integrate seamlessly with frontend and AI systems.
•Build and manage AI inference endpoints for serving models at scale.
•Collaborate with AI engineers to collect, process, and analyze data from application traces.
•Support the improvement of our AI pipeline eval systems.
•Own system design and architecture decisions for high-traffic production environments.
•Drive necessary changes, conduct code reviews, and debug issues across the entire stack, including the Next.js/React frontend, ensuring full-stack consistency.
Required Skills & Experience
•12+ years of professional experience designing, building, and operating production-grade, customer-facing SaaS and web applications end-to-end.
•Significant experience (3+ years preferred) in a small (<50 employees) or seed/Series A startup environment, where success required managing product, infrastructure, data, and operations concurrently.
•Expert-level backend engineering with Django, FastAPI, Python, REST APIs, and databases (AWS RDS/Postgres).
•Extensive experience working with AI/ML services via APIs (e.g., OpenAI, Anthropic, Braintrust, LlamaIndex, etc.).
•Experience serving AI models in production, building inference pipelines, and optimizing performance.
•Solid understanding of AI agent design, retrieval strategies, and evaluation sets.
•Demonstrated ability to drive feature development end-to-end and high proficiency in frontend development with Next.js/React.
•Experience designing fault-tolerant systems supporting thousands of concurrent users.
•Fluency with modern web stacks and frameworks (React, Next, Node, Supabase, Vercel, Python).
•Excellent communication skills and ability to explain complex technical concepts to others.
Preferred Qualifications
•Familiarity with financial data and documents.
•Experience with information retrieval systems is a big plus.
•Experience with agentic AI platforms and tools.
•Experience deploying AI/ML software to cloud platforms.
•Understanding of security best practices for financial applications, especially concerning client-side security.
You'll Excel in This Role If You
•View your role as a Product Engineer/Owner who is accountable for a feature's success, balancing architecture longevity with rapid delivery of customer value.
•Are comfortable operating with high ambiguity and minimal resources, defining the project, architecture, and deployment strategy from scratch with little external direction.
•Enjoy the fast pace of a rapidly growing startup, which means building both scrappy proofs of concept and scalable products.
•Want to be responsible for architectural decisions and enjoy having a big impact on the progress of an early stage company and platform.
•Are a strategic thinker and can contribute to long-term technical vision.
•Are passionate about climate finance and sustainability.
Interested candidates should submit their resume and any relevant projects/portfolios to hiring@ezra.fi
We are committed to building a diverse and inclusive workplace. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.