Staff Software Engineer

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TestZeus
Bangalore
Full TIme
Job Description

Staff Engineer - Full Stack (React (Frontend), Python, Go)

Location: Bangalore (Office)
Experience: 9+ years (Senior-level)
Role Type: Full-time (Tech Lead)

About TestZeus

TestZeus is pioneering the future of software testing with AI Agents and is the team behind Hercules, the world’s first open-source testing agent. By combining large language models, multi-agent orchestration, and state-of-the-art retrieval pipelines, we deliver autonomous, zero-maintenance testing for web and API workloads. We believe in rapid iteration, data-driven decisions, and a developer-first mindset to redefine how organizations ensure software quality.

Role Overview

We’re seeking a Senior Full Stack Engineer who excels at building and scaling production-grade software. In this role, you will:

  • Lead the design and development of our core platform—from frontend (React/TypeScript) to backend microservices (Go) and API layers (Python).
  • Architect, implement, and optimize microservices that power our SaaS product.
  • Collaborate with the founders and mentor 5–8 engineers, owning key milestones in our 0→1 and 1→100 growth phases.
  • Ensure the platform is reliable, maintainable, and highly scalable.
  • Build AI/agent integration features to enhance our core services.

Key Responsibilities

End-to-End Full Stack Development

  • Architect and implement web applications using React, TypeScript, and modern JavaScript (ES6+).
  • Build robust backend services in Python (FastAPI) and Go.
  • Design and consume RESTful and gRPC APIs for frontend and agent integrations.

Microservices & Infrastructure

  • Define service boundaries, data flow, and contracts.
  • Implement message queues or event-driven patterns (e.g., RabbitMQ, Kafka).
  • Ensure fault tolerance, load balancing, and zero-downtime deployments.

Scalability & Reliability

  • Architect systems to handle high concurrency and multi-region deployments.
  • Optimize PostgreSQL and Redis for performance and caching.
  • Establish monitoring and alerting with tools like Prometheus, Grafana, and ELK.

DevOps & CI/CD

  • Drive Docker and Kubernetes best practices.
  • Build and maintain CI/CD pipelines (GitHub Actions, Jenkins).
  • Manage infrastructure as code (Terraform, CloudFormation).

System Design & 0→100 Journey

  • Translate product requirements into scalable technical solutions.
  • Lead design reviews and performance tuning.
  • Mentor engineers on system design and production readiness.

AI/Agent Integration

  • Incorporate AI-driven components into services.
  • Work with AI/ML engineers to build evaluation and feedback endpoints.

Quality & Best Practices

  • Promote code reviews and automated testing.
  • Maintain code quality, security, and documentation across the stack.

Required Skills & Qualifications

Full Stack Expertise

  • Frontend: React, TypeScript, modern JavaScript (ES6+), HTML5, CSS3.
  • Backend: Python (FastAPI/Flask) and Go.
  • APIs & Integrations: REST/gRPC, WebSockets (bonus).

Microservices & Infrastructure

  • Designed microservices architectures in production.
  • Experience with RabbitMQ, Kafka, etc.
  • Strong database design (PostgreSQL, Redis).

Scalability & System Design

  • Horizontal scaling, caching, and high-availability systems.
  • Infrastructure monitoring tools (Prometheus, Grafana, ELK).

DevOps & Deployment

  • Docker, Kubernetes, CI/CD pipelines.
  • Infrastructure as Code (Terraform, CloudFormation).

Project Leadership

  • Led full project lifecycles.
  • Created technical roadmaps and drove execution.

AI & Agent Frameworks

  • Experience with LLMs, LangChain, AutoGen, etc.
  • Integrated OpenAI, Claude, or other AI endpoints.

Leadership & Collaboration

  • Mentored 5–8 engineers, facilitated design reviews.
  • Strong communication and startup experience.

Education & Experience

  • Bachelor’s or Master’s in Computer Science or equivalent experience.
  • 9+ years in software engineering, full-stack or backend roles.

Bonus Skills

  • Domain Experience: SaaS platforms, developer tools, test automation.
  • Cloud & Data Stores: Vector DBs like Pinecone, Weaviate.
  • Regulated Environments: Healthcare, fintech, or similar.

What We Offer

Impact & Ownership

Take full ownership of core services serving thousands of users. Influence product direction and user experience directly.

Competitive Compensation

Market-aligned salary and meaningful equity in a high-growth startup.

Learning & Growth

Work with modern stacks and attend conferences or workshops.

Collaborative Culture

Fast-moving, tight-knit team working together in person.

Flexible Benefits

Health insurance, offsites, and a balanced work culture in our Bangalore office.

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