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Contract Backend Developer Jobs in California (NOW HIRING)

Slope

Senior Backend Engineer

San Francisco, CA · On-site

We are looking for a senior backend engineer to own the backend systems that make that possible ... Experience designing APIs, services, jobs, data models, and contracts that other teams depend on.

Socket.dev

Senior Backend Engineer

San Francisco, CA · On-site

We are looking for a senior backend engineer to own the backend systems that make that possible ... Experience designing APIs, services, jobs, data models, and contracts that other teams depend on.

Job Mobz

Remote Backend SWE

San Francisco, CA · On-site +1

Company Description This is a contract position for one of our fintech clients. This person will be working within either the brokerage or crypto teams! We're looking for a backend engineer who gets ...

Job Mobz

Remote Backend SWE

San Francisco, CA · Remote

Company Description This is a contract position for one of our fintech clients. This person will be working within either the brokerage or crypto teams! We're looking for a backend engineer who gets ...

Attain

Lead Backend Engineer

Redwood City, CA · On-site

This is an exciting opportunity for a senior developer who is excited about growing into a broader ... Define and maintain clean, well-documented APIs and client-server contracts used by iOS and Android ...

ClifyX

Back-end Java Developer

Mountain View, CA · On-site

$60 - $78/hr

ClifyX is a company seeking a Back-end Java Developer for a 12-month contract. The role focuses on backend development using Java, Spring Boot, and RESTful APIs, requiring strong expertise in these ...

Attain

Lead Backend Engineer

Redwood City, CA · On-site

This is an exciting opportunity for a senior developer who is excited about growing into a broader ... Define and maintain clean, well-documented APIs and client-server contracts used by iOS and Android ...

Apex Informatics

Backend Python developer

San Jose, CA · On-site

Remote Duration: 12+ Months Contract We are seeking a Backend Python Developer with 4+ years of experience building and supporting scalable backend applications. Key Skills: * Bachelor's degree in ...

De Circle

Odos - Backend Engineer

San Francisco, CA · On-site +1

About the Role: We're looking for a dynamic, fast-paced individual who is excited to play a crucial role in a lean team as a core Backend and Smart Contract Engineer. This role will be responsible ...

Usul

Backend Platform Engineer

San Francisco, CA · On-site

Were the youngest founders to ever win a US Defense contract. Over the past year, weve helped ... Python, DevOps, Bash, Linux, Kubernetes, Terraform, AWS/GCP, and agentic/LLM tooling. * Bonus:

Usul

Backend Platform Engineer

San Francisco, CA · On-site

$180K - $240K/yr

We're the youngest founders to ever win a US Defense contract. Over the past year, we've helped ... Python, DevOps, Bash, Linux, Kubernetes, Terraform, AWS/GCP, and agentic/LLM tooling. * Bonus:

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Contract Backend Developer information

What is a contract backend developer?

Contract backend developers are professionals hired on a temporary or project basis to build and maintain the server-side logic, databases, and APIs that power web or mobile applications. They work behind the scenes to ensure that applications function smoothly, handle data efficiently, and communicate effectively with front-end systems. Unlike full-time employees, contract backend developers typically work for a set duration or on specific projects, offering flexibility to both clients and developers. They often bring specialized expertise in programming languages such as Python, Java, Node.js, or Ruby, and may work remotely or on-site depending on the contract terms.

What are the key skills and qualifications needed to thrive as a contract backend developer, and why are they important?

To thrive as a Contract Backend Developer, you need strong programming skills in languages like Python, Java, or Node.js, along with experience in database management and API development, supported by a relevant degree or proven project experience. Familiarity with frameworks (such as Django, Spring, or Express), cloud services (like AWS or Azure), and version control systems (e.g., Git) is typically expected. Excellent problem-solving abilities, strong communication, and the ability to quickly adapt to new codebases and team environments set top contractors apart. These skills and qualities are crucial for delivering reliable, scalable backend solutions and integrating smoothly into diverse project teams.

What are some common challenges faced by contract backend developers when joining a new project?

Contract Backend Developers often encounter challenges such as quickly understanding existing codebases, adapting to different tech stacks, and aligning with the team's development practices. Since contract roles usually have tight deadlines, developers must rapidly familiarize themselves with project documentation and workflows. Effective communication with team members and proactive clarification of requirements are essential to ensure smooth integration and successful project outcomes.

What are the most commonly searched types of Backend Developer jobs in California?

The most popular types of Backend Developer jobs in California are:

What are popular job titles related to Contract Backend Developer jobs in California?

For Contract Backend Developer jobs in California, the most frequently searched job titles are:

What job categories do people searching Contract Backend Developer jobs in California look for?

The top searched job categories for Contract Backend Developer jobs in California are:

What cities in California are hiring for Contract Backend Developer jobs?

Cities in California with the most Contract Backend Developer job openings:

Contract Backend Developer jobs near you
Infographic showing various Contract Backend Developer job openings in California as of August 2026, with employment types broken down into 58% Full Time, and 42% Contract. Highlights an 100% In-person job distribution.

Senior Backend Engineer

San Francisco, CA • On-site

Slope
See more jobs at Slopeexternal

Full-time

Re-posted 27 days ago

Key responsibilities

  • Build and own production systems for underwriting, bank-data review, credit review workflows, and portfolio monitoring.

  • Create reusable infrastructure for evidence gathering, decisioning, monitoring, and human-in-the-loop review.

  • Build internal tools to assist the credit risk team in data review, understanding decisions, handling exceptions, and improving workflow efficiency.

Job description

About Slope
Slope builds AI-native credit infrastructure for B2B commerce. We help growing businesses access capital and help credit teams make faster, better, more automated decisions.
We are looking for a senior backend engineer to own the backend systems that make that possible.
The role
You will work on the backend systems that power Slope's embedded credit, payments and underwriting.
You should be excited by messy, important problems. Your job is to turn ambiguous problems and improvements into reliable production systems.
What you'll do
  • Build and own production systems for underwriting, bank-data review, credit review workflows, portfolio monitoring.
  • Create reusable infrastructure for evidence gathering, decisioning, monitoring, and human-in-the-loop review.
  • Build internal tools that help the credit risk team review data, understand decisions, handle exceptions, and move faster without sacrificing correctness.
  • Clearly communicate technical assumptions, tradeoffs, failure modes, system boundaries, and migration plans.
  • Own ambiguous projects end-to-end: define the problem, propose a path, align across teams, ship production slices, measure, and iterate.
  • Improve the reliability, latency, correctness of systems that directly affect credit decisions and customer experience.
What we're looking for
  • 5+ years of backend engineering experience, preferably in a fast-moving environment.
  • Strong production backend experience with Node.js/TypeScript.
  • Strong SQL skills and comfort working with relational databases, data warehouses, ETL/data pipelines, and messy real-world data.
  • Experience designing APIs, services, jobs, data models, and contracts that other teams depend on.
  • Experience in payments infrastructure.
  • A track record of shipping systems where correctness, reliability, and operational clarity matter.
  • High agency and proactive: you do not need fully specified tickets, and you know how to create clarity when the problem is vague.
  • Strong written and verbal communication. You can explain tradeoffs, and failure modes.
  • Product judgment for internal users. You care whether the system actually improves underwriting decisions and workflows, not just whether the code shipped.
  • Experience with AWS, Postgres, Snowflake, queues, async jobs, observability tooling, and third-party financial APIs.
  • Excitement around building AI-native infrastructure and agentic workflows, both within the engineering team as well as broader credit and data science teams.
  • Excited to experiment with AI tools.
  • Strong plus: Startup experience, especially in a high-ownership environment.
Why Slope
  • You will work on the core systems that determine how Slope understands risk, extends capital, and helps businesses grow.
  • You will have high ownership: small team, important surface area, real production impact.
  • You will report to the CEO and work on mission-critical projects.
  • You will help build the operating system for B2B credit: faster decisions, better workflows, stronger feedback loops, and scalable infrastructure.

Slope is backed by top investors including OpenAI's Sam Altman, Y Combinator, Union Square Ventures, and leading founders/operators across fintech and technology.
Other
Location: San Francisco preferred. Exceptional remote candidates in compatible time zones considered.
Level: Senior IC.

Apply