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Freelance Java Developer Startup Jobs in Fairfield, CA

HMBL

Founding Engineer

San Francisco, CA · On-site

We're seeking a Founding Software Engineer for an early staged AI & LLM startup based in San ... Experience in Python or other programming languages such as Go, Java, or C++ * Experience in web ...

HMBL

Founding Engineer

San Francisco, CA · On-site

We're seeking a Founding Software Engineer for an early staged AI & LLM startup based in San ... Experience in Python or other programming languages such as Go, Java, or C++ * Experience in web ...

HMBL

Founding Engineer

San Francisco, CA · On-site

We're seeking a Founding Software Engineer for an early staged AI & LLM startup based in San ... Experience in Python or other programming languages such as Go, Java, or C++ * Experience in web ...

Fivetran

Principal Software Engineer

Oakland, CA · Hybrid

$155K - $207K/yr

Java (JVM, JIT, GC tuning, thread management), JUnit * Claude Code * Docker and Kubernetes * AWS ... Experience working in startup environments. #LI-HYBRID #LI-EM1

Liberate

Senior AI Agent Engineer

San Francisco, CA · On-site

$120K - $220K/yr

... startup environment * Experience with programming languages such as Python, Java, or similar, and familiarity with APIs, data integration, and cloud platforms. * Strong technical background with ...

Liberate

Senior AI Agent Engineer

San Francisco, CA · Hybrid

$120K - $220K/yr

... startup environment * Experience with programming languages such as Python, Java, or similar, and familiarity with APIs, data integration, and cloud platforms. * Strong technical background with ...

Shipstr

Vice President of Engineer

San Francisco, CA · On-site

You should be a passionate developer who wants to make a major impact at an early-stage startup ... Python, Java, AngularJS, JavaScript, Apache, Nginx, Redis, MySQL and PostgreSQL - Strong to ...

Shipstr

Vice President of Engineer

San Francisco, CA · On-site

You should be a passionate developer who wants to make a major impact at an early-stage startup ... Python, Java, AngularJS, JavaScript, Apache, Nginx, Redis, MySQL and PostgreSQL - Strong to ...

Replo

Senior Backend Engineer

San Francisco, CA · On-site

$200K - $500K/yr

If you have experience writing these systems in Python/Go/Java that's cool too, as long as you're ... Worked at an early-stage (Series A or earlier) startup previously * Have not wasted hours interview ...

EliseAI

Senior Software Engineer

San Francisco, CA · On-site

$240K - $300K/yr

Requirements * Startup mindset with a strong sense of ownership, urgency, and pragmatism in ... in Java, C#, Go, or Python * Willingness to work in person at our office 4-5 days a week Nice to ...

Fivetran

Principal Software Engineer

Oakland, CA · On-site

$155K - $207K/yr

Java (JVM, JIT, GC tuning, thread management), JUnit * Claude Code * Docker and Kubernetes * AWS ... Evaluate and introduce new technologies and approaches to improve developer experience and platform ...

Rational Dynamics

Forward Deployed Engineer

Berkeley, CA · On-site

$180K - $250K/yr

We are an early-stage startup. Our founders previously started Voleon, now one of the world ... Proven ability to ship production-grade applications in languages such as Python, Java, C++, Go ...

HealthLeap Inc.

Backend Engineer

San Francisco, CA · On-site +1

Strong proficiency in one or more backend programming languages (e.g., Python, Java, Go). Extensive ... Previous work in a startup environment or scaling early-stage products. Location: San Francisco ...

Britive

Software Engineer

San Francisco, CA · On-site +1

... startup environment. This position will report to the Engineering Manager. Your Impact Key ... In-depth knowledge of Spring, Spring Boot, Java, REST Web Services, SQL/NoSQL databases, ELK stack ...

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Freelance Java Developer Startup information

See Fairfield, CA salary details

$15

$57

$78

How much do freelance java developer startup jobs pay per hour?

As of Jul 15, 2026, the average hourly pay for freelance java developer startup in Fairfield, CA is $57.70, according to ZipRecruiter salary data. Most workers in this role earn between $49.90 and $64.57 per hour, depending on experience, location, and employer.

What is the difference between Freelance Java Developer Startup vs Freelance Java Developer Corporate?

AspectFreelance Java Developer StartupFreelance Java Developer Corporate
Work EnvironmentIndependent, flexible, project-basedRemote or office-based, structured projects
Client InteractionDirect with startups or small teamsOften with corporate clients or departments
Project ScopeVaried, often innovative or MVP developmentLong-term, maintenance, or enterprise solutions
Required CredentialsJava certification, portfolio, experienceJava certification, experience, possibly more formal credentials

Freelance Java Developer Startup roles typically involve working independently on diverse projects for startups, emphasizing innovation and flexibility. In contrast, Freelance Java Developer Corporate roles often focus on structured, long-term projects for established companies, with more formal client interactions and expectations.

Freelance Java Developer Startup jobs near you

CTO - Economic Risk Management (ERM)

risk

San Francisco, CA • On-site

Other

Re-posted 5 days ago

Job description

CTO - Economic Risk Management (ERM) San Francisco, CA - Full Time Equity - join the founding team 3 to 4 years experience preferred Computer Science / Physics / Applied Math / Financial Engineering - background in machine learning algorithms, distributed computing, and data mining preferred DESCRIPTION: CTO - Algorithms, Data Structures, Hadoop, Java, Python, R, BASH programs Skills Required - Data mining of large data sets (Big Data!), Hadoop, Java / Python / C++, Linux, Statistics and Probability Theory We're a San Francisco based startup that specializes in developing supply chain risk management software for the manufacturing, construction, and transportation industries. Our founders studied at Berkeley and Stanford, and have worked at some of the leading companies in software, finance, and manufacturing, including IBM, Axioma, FTSE, Alphacet, MSCI, and Toyota. Our advisers include David Leinweber of LBNL, and our research includes several published papers, a working prototype, and a large database of financial and economic time series.

We have two development clients - a large manufacturing company and an even larger supply chain certification firm. Going forward, we're looking for a brilliant systems architect to build out the platform. The ideal candidate will be a Computer Scientist who can write software to analyze terabytes of data and billions of rows to discover correlations and patterns in economic data, and to come up with algorithms and strategies for reducing customers' risk exposure.

Typical candidates for this role have not only developed data mining algorithms but also built large scale systems incorporating them. RESPONSIBILITIES: ~Research, investigate, pick industrial data mining/machine learning algorithms. ~Implement these algorithms using grid computing & affect the product direction.

~Develop and support the data store and cloud compute cluster EXPERIENCE: 1.) Experience in data mining and machine learning on large amounts of sparse data. Must have a good understanding of algorithms, data structures, performance optimization techniques, and object-oriented programming. Large scale data manipulation

2.) BS/MS in Computer Science / Physics / Applied Math / Financial Engineering (with emphasis in data mining/machine learning/artificial intelligence/mathematics/OR). 3.) Experience developing software using Java / Python / C++ / R on Linux. Experience with Hadoop or MapReduce is a huge plus

4.) Should have a strong background in Linear algebra/Matrix operations. Other strong pluses and areas of interest include: ~Machine learning algorithms (neural networks, support vector machines, bayes, genetic algorithms) ~Grid Computing/Parallel Computing/Distributed Computing ~Time series analysis (GARCH, ARMA, etc.) ~Statistical analysis (regression, correlation) ~Experience with Monte Carlo simulation

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