Full Stack Engineer - AI Lab

Obsidian; Mumbai; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Obsidian is seeking a Full-Stack Software Engineer to join a GenAI team building foundational AI models and real software atop frontier models. You will work across Python, Java, Rust, C#, C++, and TypeScript, delivering end-to-end solutions and integrating model APIs.

Ideal candidates have 3+ years of production experience, strong full-stack capabilities, and the ability to onboard quickly while contributing working code on fast-moving projects.

Qualifications

• 3+ years of production software experience at a top-tier org.
• Proficiency in at least one listed language plus a second language.
• Experience with backend services and APIs, frontend (React or similar), databases, and cloud deployment.
• Able to onboard quickly and contribute code early.
• Clear written communication of technical decisions.

Responsibilities

• Build and ship full-stack applications and internal tools across languages.
• Integrate pre-release model APIs into working software and telemetry.
• Diagnose and document model/integration failure modes for the research team.
• Prototype quickly against shifting requirements with limited up-front specs.
• Maintain code quality, architecture, and documentation with the team.

Skills

Python

Java

Rust

C#

C++

TypeScript

Tools

React

REST APIs

Databases

Cloud platforms

Job description

Join a leading AI lab's cutting-edge GenAI team to be at the core of the AI revolution, where your expertise fuels the development of the most advanced Large Language Models.

1. Overview

Join a leading AI lab's cutting-edge GenAI team and help build foundational AI models from the ground up. We're seeking talented Full-Stack Software Engineers with hands‑on production experience across modern application stacks — Python, Java, Rust, C#, C++, and TypeScript — to build, integrate, and stress‑test real software on top of frontier models before they ship. Engineers work directly with the AI lab's engineering manager on fast‑moving projects and are expected to onboard quickly and contribute working code early.

This is a full‑time engagement of 40 hours per week.

2. Key Responsibilities

• Build and ship full‑stack applications, services, and internal tools — in Python, Java, Rust, C#, C++, or TypeScript — that exercise frontier model capabilities end to end.

• Integrate pre‑release model APIs into working software, including the surrounding scaffolding: tool interfaces, evaluation harnesses, and telemetry.

• Diagnose and document model and integration failure modes surfaced while building, translating engineering observations into clear written feedback for the research team.

• Prototype quickly against shifting requirements, delivering working increments with limited up‑front specification.

• Collaborate with the engineering manager and other engineers to maintain consistency in code quality, architecture, and technical documentation.

3. Core Qualifications

• 3+ years of dedicated professional experience building and shipping production software at a recognized, top‑tier organization.

• Production experience in at least one of Python, Java, Rust, C#, or C++, plus working proficiency in a second language — this cohort is intentionally staffed across multiple language ecosystems.

• Hands‑on experience across the stack: backend services and APIs, a modern front‑end framework (React or equivalent), relational or document databases, and cloud deployment.

• Demonstrated ability to onboard onto an unfamiliar codebase and deliver working code quickly with minimal ramp‑up.

• Demonstrable career progression.

• Ability to engage reliably for at least 40 hours/week during weekdays.

• Strong written communication skills and the ability to explain complex technical decisions clearly.