Staff Software Engineer

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Posted on July 01, 2025

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.