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Backend Full Stack Engineer Jobs in Sunnyvale, CA

FlexAI

Senior Full Stack Engineer

Santa Clara, CA · On-site

They are seeking a Senior Full Stack Engineer to develop end-to-end features for their PaaS platform, working on both frontend and backend components while collaborating with infrastructure teams.

Enboarder

Full Stack Engineer

San Francisco, CA · On-site

$150 - $200/hr

The Role We are looking for a full-stack engineer to join our team as one of our engineering first ... Collaborate closely with the backend team to ensure smooth integration and contribute to ...

Phonely Ltd

Full Stack Engineer

San Francisco, CA · On-site

Senior Full Stack Engineer (React / Next.js) At some point in the future, every business will ... Work closely with backend engineers to integrate APIs, real-time systems, and voice AI workflows

Wheelhouse

Full Stack Engineer

San Francisco, CA · On-site +1

You will be joining a team that includes other front-end engineers, a designer, and backend-leaning full-stack engineers. Your role will be to elevate the quality of our interface, ensuring that our ...

Phonely

Full Stack Engineer

San Francisco, CA · On-site

$125 - $150/hr

Senior Full Stack Engineer (React / Next.js) At some point in the future, every business will ... Work closely with backend engineers to integrate APIs, real-time systems, and voice AI workflows

Teleo

Senior Full Stack Engineer

Palo Alto, CA · On-site

The Senior Full Stack Engineer will own and professionalize the full-stack platform, establishing ... backend services in Python and Node.js on AWS (Lambda, EC2, DynamoDB, S3, Cognito) • Develop ...

Varick Agents LTD.

Full Stack Engineer

San Francisco, CA · On-site

$150 - $200/hr

You'll work across backend services, APIs, data pipelines, and product interfaces. The work ranges from building the orchestration layer that coordinates agent execution to shipping the dashboards ...

Jobsbridge

Senior Full Stack Engineer

Fremont, CA · On-site

... back end technologies. - Experience using front end JavaScript framework such as AngualrJS and ... Full Stack Engineer with experience using front end JavaScript framework such as AngualrJS and ...

Wonderschool

Full Stack Engineer

San Francisco, CA · On-site

$180K - $220K/yr

As a Senior Full Stack Engineer, you will own features end-to-end, working across frontend, backend, and data layers to deliver high-quality, scalable products. You will operate as a builder ...

Perfict

Sr. Full Stack Engineer

Dublin, CA · On-site

Perfict is a company looking for a Sr. Full Stack Engineer to rebuild legacy UI and develop backend services. The role involves designing REST APIs, collaborating with peers, and utilizing modern ...

Wonderschool

Full Stack Engineer

San Francisco, CA · On-site

$180K - $220K/yr

As a Senior Full Stack Engineer, you will own features end-to-end, working across frontend, backend, and data layers to deliver high-quality, scalable products. You will operate as a builder ...

Twenty80 LLC

Full Stack Engineer

San Francisco, CA · On-site

$150 - $200/hr

About the role A San Francisco-based startup is seeking a versatile full-stack engineer to join its ... Build and maintain scalable backend systems using modern frameworks, databases, and cloud platforms.

Clerkie

Full-Stack Engineer

San Francisco, CA · Remote

$90/hr

At Clerkie, engineers don't just implement specs. You'll collaborate closely with product and ... Build and maintain full-stack features across backend services and user-facing applications * Own ...

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All JobsBackend Full Stack Engineer JobsBackend Full Stack Engineer Jobs in Sunnyvale, CA

Backend Full Stack Engineer information

See Sunnyvale, CA salary details

$52.2K

$158.2K

$223.6K

How much do backend full stack engineer jobs pay per year?

As of Sep 7, 2026, the average yearly pay for backend full stack engineer in Sunnyvale, CA is $158,174.00, according to ZipRecruiter salary data. Most workers in this role earn between $130,300.00 and $185,400.00 per year, depending on experience, location, and employer.

What is a backend full stack engineer?

A Backend Full Stack Engineer is a software developer who specializes in building and maintaining the server-side logic, databases, and APIs of an application, while also having proficiency in front-end technologies. They are capable of working on both the backend and frontend parts of web applications, allowing them to develop end-to-end features and ensure seamless integration between the client and server sides. This role requires strong knowledge of programming languages such as JavaScript (Node.js), Python, or Java, as well as familiarity with databases, server architectures, and various web frameworks. Backend Full Stack Engineers often collaborate with designers, frontend developers, and other stakeholders to deliver complete and functional products.

What are the key skills and qualifications needed to thrive as a backend full stack engineer?

To thrive as a Backend Full Stack Engineer, you need strong proficiency in server-side languages (such as Node.js, Python, or Java), database management, and a solid understanding of front-end technologies, usually supported by a degree in computer science or related experience. Familiarity with frameworks (like Express, Django, or Spring), version control systems (like Git), and cloud platforms (such as AWS or Azure) is typically required. Effective problem-solving, communication, and teamwork skills help you collaborate across disciplines and deliver robust solutions. These skills ensure scalable, maintainable applications and seamless integration between backend and frontend systems, which are critical for organizational success.

How does a backend full stack engineer typically collaborate with frontend developers and other team members?

Backend Full Stack Engineers frequently work alongside frontend developers, product managers, and QA engineers to deliver seamless user experiences. They are responsible for building and maintaining server-side logic and APIs, ensuring data flows efficiently between the backend and frontend. Effective communication is essential, as they must align backend functionality with frontend requirements and participate in code reviews, sprint planning, and troubleshooting sessions. This collaborative environment fosters learning and often provides opportunities to contribute across the tech stack, enhancing both technical and interpersonal skills.

What is the difference between Backend Full Stack Engineer vs Frontend Developer?

AspectBackend Full Stack EngineerFrontend Developer
Primary FocusDeveloping server-side logic, databases, and APIsDesigning and implementing user interface and client-side features
Required SkillsProgramming languages like Python, Java, Node.js; databases; server managementHTML, CSS, JavaScript; frameworks like React or Angular
Work EnvironmentOften involved in both front-end and back-end tasks, collaborating across teamsPrimarily focused on client-side development, UI/UX design

While both roles require strong programming skills, Backend Full Stack Engineers handle both server-side and client-side development, whereas Frontend Developers focus mainly on creating engaging user interfaces. Understanding these differences helps employers and job seekers target the right skills and responsibilities for each role.

What are popular job titles related to Backend Full Stack Engineer jobs in Sunnyvale, CA?

For Backend Full Stack Engineer jobs in Sunnyvale, CA, the most frequently searched job titles are:

What job categories do people searching Backend Full Stack Engineer jobs in Sunnyvale, CA look for?

The top searched job categories for Backend Full Stack Engineer jobs in Sunnyvale, CA are:

What cities near Sunnyvale, CA are hiring for Backend Full Stack Engineer jobs?

Cities near Sunnyvale, CA with the most Backend Full Stack Engineer job openings:

Backend Full Stack Engineer jobs near you
Infographic showing various Backend Full Stack Engineer job openings in Sunnyvale, CA as of August 2026, with employment types broken down into 92% Full Time, 2% Part Time, and 6% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $158,174 per year, or $76 per hour.

Senior Full Stack Engineer

FlexAI

Santa Clara, CA • On-site

Full-time

Re-posted 3 days ago

Job description

Job Summary:
FlexAI is a company focused on building and deploying AI solutions across various cloud environments. They are seeking a Senior Full Stack Engineer to develop end-to-end features for their PaaS platform, working on both frontend and backend components while collaborating with infrastructure teams.
Responsibilities:
• Build and ship end-to-end features across our platform (developer tools, marketplace, billing, admin)
• Develop high-performance UIs using React
• Design and implement APIs and backend services using Python (FastAPI) and/or Node.js
• Define clean, scalable contracts between frontend and backend
• Work on data-intensive workflows (jobs, compute orchestration, resource management)
• Collaborate with platform and infrastructure teams to build reliable systems
• Debug and optimize across the stack — from UI to backend performance
• Own features end-to-end: design, build, ship, and operate
Qualifications:
Required:
• 5+ years of experience with a Bachelor's and/or Master's degree building Full Stack applications
• Strong skills in: Frontend: React (modern stack)
• Strong skills in: Backend: Python (FastAPI or similar) or Node.js
• Experience designing and working with APIs
• Comfortable with data models, async workflows, and scalable systems
• Ability to operate independently and move fast with high ownership
• Strong communication and collaboration skills
• Experience working in startup environments
• Comfortable leveraging AI coding tools and agents to move faster
Preferred:
• Experience with cloud platforms, developer tools, or compute systems
• Familiarity with Kubernetes, CI/CD, and observability
• Exposure to billing, licensing, or marketplace systems
Company:
AI infrastructure that adapts as you grow Founded in 2023, the company is headquartered in Paris, FRA, with a team of 11-50 employees. The company is currently Early Stage.

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