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Freelance Java Developer Startup Jobs (NOW HIRING)

Hive-X

WI · On-site

$100 - $130/hr

We are looking for a 5 Senior Java Backend Developers / Integration Engineers to strengthen the ... Engagement: freelance or employee, depending on profile * Duration: long-term reinforcement for the ...

Karwell Tech

Full Stack Java Developer

Paramus, NJ · On-site

$53.25 - $68.50/hr

So, whether your company is a small startup struggling to make it in the industry or an established ... Java APIs - Experience working in an Agile Environment - Experience in Oracle from a Java ...

Karwell Tech

Full Stack Java Developer

Paramus, NJ

$53.25 - $68.50/hr

So, whether your company is a small startup struggling to make it in the industry or an established ... Java APIs - Experience working in an Agile Environment - Experience in Oracle from a Java ...

Samsung

Java Backend Developer

San Jose, CA · On-site

$59.25 - $76.75/hr

Self-directed and capable of working in a dynamic and startup-like environment. Preferred: Master ... Experience in multi-threaded programming and distributed systems. Experience in a high paced agile ...

Samsung

Java Backend Developer

San Jose, CA · On-site

$59.25 - $76.75/hr

... startup-like environment. Preferred: • Master's degree in computer science or equivalent. • Experience in multi-threaded programming and distributed systems. • Experience in a high paced agile ...

Matcha

$110 - $130/hr

We are seeking a highly skilled Senior Java Developer with proven experience using Cursor AI to ... Ability to excel in a fast-paced, startup-like environment * Knowledge of developer tooling across ...

New

Byondfiles

WI · On-site

$70 - $90/hr

ByondFiles is een snelgroeiende startup dat oplossingen biedt aan enkele van de grootste ... Voor ons bedrijf zijn we nog op zoek naar een medior Full Stack Java Developer voor de verdere ...

Rantz Marketing

... website startup: Local automotive-focused start-up is seeking freelance web designer/developer ... Must be well versed in HTML, with a base understanding of PHP, Java, Photoshop and CSS. Experience ...

ENTICO ICT

WI · On-site

$90 - $130/hr

Uitvoeren van technische analyses, debugging en reverse engineering op bestaande toepassingen ... opdracht: consultancy / freelance mogelijk Ben jij een Technical Analyst met een sterke Java ...

360 IT Professionals

JAVA Full Stack

Bentonville, AR

$46 - $59.50/hr

Title: JAVA Full Stack Location: Bentonville, AR Duration: 6 Months C2H Client : Walmart Inc 3+ ... Startup, XP) and cross-functional teams (Product Owners, Scrum Masters, Developers, Designers)

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

As of Aug 22, 2026, the average hourly pay for freelance java developer startup in the United States is $56.70, according to ZipRecruiter salary data. Most workers in this role earn between $49.04 and $63.46 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.

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Freelance Java Developer Startup jobs near you
Infographic showing various Freelance Java Developer Startup job openings in the United States as of August 2026, with employment types broken down into 82% Full Time, 2% Part Time, and 16% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $117,931 per year, or $56.7 per hour.

Senior Java Backend Developer / Integration Engineer

Hive-X

WI • On-site

$100 - $130/hr

Other

Posted 4 days ago

Job description

We are looking for a 5 Senior Java Backend Developers / Integration Engineers to strengthen the team working in pharma sector, a strategic integration platform in the healthcare ecosystem. This role is ideal for someone who enjoys building reliable backend services, secure APIs, event-driven integrations, and cloud-connected data flows in a modern Java environment.

Mission

You will join a team responsible for the evolution of the solution, a multi-module platform built around integration, interoperability, security, and data exchange.

Responsibilities
  • Designing and implementing backend features in a modern Java stack
  • Building and maintaining secure APIs and gateway flows
  • Developing integrations with external systems and healthcare partners
  • Working on event-driven communication and asynchronous processing
  • Contributing to data persistence, migration, and operational reliability
  • Supporting cloud-based data exchange patterns and AWS-connected services
  • Ensuring code quality through unit and integration testing
  • Collaborating closely with analysts, architects, and product stakeholders
Tech Environment

The current stack includes:

  • Spring Boot 4
  • Spring Cloud Gateway
  • Spring WebFlux
  • Spring Security
  • Spring Data JPA
  • MariaDB
  • Flyway
  • Redis
  • JWT / OAuth2 Resource Server
  • AWS SDK with S3 , Glue , Athena
  • OpenAPI / Springdoc
  • Jackson
  • Parquet / Hadoop
  • Maven
  • JUnit 5 / Mockito
Qualifications
  • Strong experience in backend development with Java and Spring
  • Solid knowledge of API design, security, and system integration
  • Experience with relational databases such as MariaDB or MySQL
  • Experience with messaging platforms such as Kafka
  • Familiarity with cloud environments, ideally AWS
  • Good understanding of authentication and authorization mechanisms such as JWT and OAuth2
  • A quality-driven mindset with attention to testing, maintainability, and production reliability
  • The ability to work autonomously while collaborating effectively with a broader team
Nice to Have
  • Experience with Spring Cloud Gateway or API gateway patterns
  • Experience with Redis
  • Exposure to healthcare, interoperability, or regulated environments
  • Experience with data pipelines or analytical storage flows using S3 / Athena / Glue
  • Familiarity with hexagonal architecture or domain-driven design principles
Benefits
  • Strategic project with real business and integration impact
  • Modern Java and Spring ecosystem
  • Combination of backend engineering, integration, security, and cloud topics
  • Collaborative team environment
  • Opportunity to contribute to a platform used in a sensitive and meaningful domain
Practical Information
  • Location: Belgium / hybrid possible
  • Engagement: freelance or employee, depending on profile
  • Duration: long-term reinforcement for the team
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