Full Stack Developer (React/Next.js + Python/FastAPI/Airflow + Agent Systems)

About Us

OpenTax is transforming the way accountants manage tax compliance by consolidating

real-time data from Agent Services Accounts and other sources into a single, intuitive

dashboard. With tens of thousands of accountants connected, our platform processes vast

amounts of financial and tax data that must be refreshed continuously, requiring a robust,

scalable, and intelligent infrastructure.

We are looking for a Full Stack Developer with 3–4 years of professional experience who

can work across both frontend and backend systems, with strong skills in React/Next.js,

Python/FastAPI, and hands-on exposure to AI-first agentic workflows using LangGraph,

LangSmith, and RAG-based pipelines. The ideal candidate thrives at the intersection of

scalable backend systems, modern frontend applications, and intelligent AI-driven

workflows.

Key Responsibilities

Frontend (React/Next.js + Agent UI)

• Develop and maintain a scalable, high-performance frontend application using React.js and Next.js.

• Integrate with APIs to display real-time data from agents and backend services.

• Support observability and debugging of agent workflows with intuitive dashboards.

Backend (Python/FastAPI/Airflow + Agent Orchestration)

• Build and maintain FastAPI services for efficient, high-performance API integrations.

• Design and implement backend systems that coordinate AI agents and sub-agents.

• Use LangGraph to orchestrate multi-step workflows and agent hierarchies.

• Leverage LangSmith for evaluation, monitoring, and observability of agent behaviour in production.

• Implement robust data models and efficient queries (SQL/Postgres) for high-frequency workloads.

AI-First & Collaboration

• Integrate LLMs (OpenAI, Anthropic, Hugging Face, etc.) into backend workflows for reasoning, automation, and decision-making.

• Develop caching, fallback strategies, and real-time monitoring for AI services.

• Build APIs and frontend flows optimized for AI-first user experiences.

• Collaborate with product, AI, and engineering teams to deliver intelligent, user-facing

features.

• Continuously monitor, troubleshoot, and optimize performance across frontend and backend systems.

Key Requirements

Experience

• 3–4 years of professional experience in full stack development.

• Proven track record building and deploying scalable web applications.

Frontend Skills

-Strong proficiency in React.js and Next.js (SSR/ISR/CSR).

• Hands-on experience with state management libraries (Redux, React Query, Zustand).

• Strong knowledge of TypeScript and UI frameworks (Tailwind CSS, Material UI).

Backend Skills

• Strong Python development experience.

• Expertise in FastAPI (or Flask/Django) for building APIs.

• Proficiency with Airflow for ETL pipeline management.

• Strong database skills with SQL/Postgres and large-scale data processing.

AI & Agentic Workflows

• Hands-on experience building with LangGraph and LangSmith.

• Familiarity with multi-agent systems, sub-agent delegation, and orchestration.

• Experience integrating LLM APIs (OpenAI, Anthropic, Hugging Face, etc.) into applications.

• Understanding of AI system observability, evaluation pipelines, and prompt/response lifecycles.

Other Qualities

• Strong problem-solving skills – comfortable debugging across frontend and backend.

• Excellent communication skills with both technical and non-technical stakeholders.

• Fast & hardworking – efficient, deadline-driven, and proactive.