Senior / Staff Full-Stack Engineer (React, TypeScript, Rust, AI Platforms)

Techifide Ltd; Brasil; Presencial; BRL 120 000 - 160 000; Tempo integral

Resumo da oferta

Techifide Ltd is seeking a Senior Engineer located in Brazil, who will own and develop features from user interfaces to backend infrastructure. This role requires expertise in React, TypeScript, and Rust to build complex applications while ensuring smooth integration with AI systems.

The ideal candidate will have a strong understanding of modern software architecture, a collaborative mindset, and the ability to make impactful technical decisions.

If you enjoy taking responsibility for the entire system, you'd thrive in our team-oriented environment.

Qualificações

• Proven experience shipping complex web applications as a Senior or Staff engineer.
• Deep experience with React and TypeScript, including architecture decisions and complex state management.
• Experience writing backend services in Rust.
• Experience integrating LLM or AI agent APIs, including streaming responses, tool calls, and error handling.
• Strong understanding of how to connect frontend applications, backend services, and AI systems into a coherent architecture.
• Working knowledge of Terraform and infrastructure-as-code.
• Ability to work collaboratively with platform engineers to define clean API boundaries.
• Experience using AI tools to improve development productivity.
• Clear communication and a pragmatic engineering mindset.

Responsabilidades

• Own features from interface to infrastructure.
• Build React and TypeScript applications with clean interfaces.
• Write Rust backend services that orchestrate data and services.
• Integrate AI APIs into product functionalities.
• Ensure data flows correctly across the stack.
• Define API contracts with engineers.
• Update Terraform infrastructure as required.

Conhecimentos

Strong English communication skills

Experience with React

Experience with TypeScript

Experience writing backend services in Rust

Integrating AI APIs

Working knowledge of Terraform

Collaborative API design

Using AI tools to improve productivity

Descrição da oferta de emprego

• Strong English communication skills are required, both written and spoken.
• Candidates must be physically located in Brazil. Proof of residency may be requested during the hiring process.

About

We are looking for a senior engineer who enjoys owning problems end-to-end, not just implementing isolated features.

This role is for someone who understands how modern software systems work across layers - from the user interface all the way down to backend services, AI integrations, and cloud infrastructure.

You will build product features that connect multiple parts of the platform: React interfaces, TypeScript application logic, Rust backend services, and APIs from our Machine Learning and agentic AI systems. Success in this role requires understanding how these layers interact and designing solutions that work cleanly across them.

You will work closely with product, design, platform engineers, and our Machine Learning team to turn complex AI capabilities into reliable, usable product experiences.

This is not a feature factory role. You will be expected to make technical decisions, design systems, and take responsibility for delivering features that work across the full stack.

What You Will Do

You will own features from interface to infrastructure.

That means:

• Building React and TypeScript applications that expose powerful capabilities through clean, intuitive interfaces.
• Writing Rust backend services that orchestrate data, agent workflows, and service communication.
• Integrating AI and agentic APIs produced by our Machine Learning team and translating those capabilities into real product functionality.
• Ensuring data flows correctly across the stack: frontend backend AI services back to the user.
• Defining API contracts with platform and backend engineers so the system remains clean and scalable.
• Making targeted updates to our Terraform infrastructure when features require new roles, permissions, or services.

The expectation is simple: you see the whole system, not just your piece of it.

What We Are Looking For

• Proven experience shipping complex web applications as a Senior or Staff engineer.
• Deep experience with React and TypeScript, including architecture decisions and complex state management.
• Experience writing backend services in Rust.
• Experience integrating LLM or AI agent APIs, including streaming responses, tool calls, and error handling.
• Strong understanding of how to connect frontend applications, backend services, and AI systems into a coherent architecture.
• Working knowledge of Terraform and infrastructure-as-code.
• Ability to work collaboratively with platform engineers to define clean API boundaries.
• Experience using AI tools to improve development productivity.
• Clear communication and a pragmatic engineering mindset.

Bonus Points

• Experience in any of the following areas is useful but not required:
• 3D or graphics-heavy applications (Three.js, WebGL, WebGPU, CAD).
• CI/CD pipelines and GitLab workflows.

Why This Role Is Interesting

Here, you will work on problems that span UI, backend systems, AI agents, and infrastructure. The value comes from understanding how those layers interact and building solutions that work across all of them.

If you enjoy seeing the entire system and owning the outcome, you will feel at home here.