Senior Full-Stack Software Developer (Java/Spring + React) - Freelance B2B Contract

🧩 Job Title

Senior Full-Stack Software Developer (Java/Spring + React)

💼 About Cleverbit Software

At Cleverbit Software, we build technology that matters — for real clients, with real impact. Our remote-first, flexible culture supports curious minds, collaborative spirits, and people who care deeply about the work they do.

We believe the best results come from small, focused teams empowered to think independently, work flexibly, and grow continuously.

🎯 The Role

We’re looking for a Senior Full-Stack Software Developer with strong backend expertise in Java 21 and Spring Boot, combined with solid experience in React.

This role is primarily backend-focused (approximately 75%), with responsibility for maintaining and enhancing the frontend web application (approximately 25%).

This is a freelance position (ie: a few hours per week - Monday to Friday).

Contract type: fixed B2B contract (short term/few months).

🧠 Key Responsibilities

• Work on development tasks from a prioritised backlog using tools such as Azure DevOps and/or Jira
• Build and maintain backend services and REST APIs using Java 21 and Spring Boot
• Implement data ingestion, validation, and reporting/export workflows (PDF, Excel, JSON) and expose them through usable UI flows
• Work with PostgreSQL (schema changes, migrations, query optimisation, ORM tuning using JPA/Hibernate)
• Build and maintain the React-based web application (UI features, routing, state management, forms, API integration)
• Write and maintain automated tests across the stack (unit, integration, and frontend testing where applicable)
• Improve operational quality including logging, structured error handling, performance optimisation, and security best practices
• Collaborate closely with Product, QA, and DevOps to deliver features end-to-end
• Participate actively in pull request (PR) reviews
• Contribute to architectural discussions and technical decision-making

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• Share knowledge to improve internal processes and technical skillsets
• Provide meaningful input during agile ceremonies (stand-ups, refinements, retrospectives)

🧳 What We’re Looking For

✔️ BSc degree in Computer Science or equivalent practical experience

✔️ 5+ years of strong Java and Spring Boot experience (API design, debugging, performance optimisation)

✔️ 2+ years of strong React experience (component design, hooks, state management)

✔️ Strong proficiency in TypeScript/JavaScript

✔️ Experience with modern frontend tooling (Vite/Webpack, npm/yarn/pnpm)

✔️ Solid experience with PostgreSQL and ORM frameworks (JPA/Hibernate)

✔️ Experience handling database migrations

✔️ Testing experience: Backend: JUnit, Mockito & Frontend: Jest, React Testing Library

✔️ Experience working in CI-enabled environments

✔️ Analytical mindset with strong problem-solving skills

✔️ Experience working in agile environments using Azure DevOps, Jira, or similar tools

✔️ Excellent verbal and written communication skills in English (C1/C2 level required)

Nice to have:

➕ Familiarity with Microsoft Azure (app hosting, storage, identity/Key Vault concepts)

➕ Experience with CI/CD pipelines and containerisation (Docker, release automation)

➕ Experience with observability tooling (structured logs, metrics, tracing)

➕ Experience delivering data-heavy applications with reporting/export capabilities

📌 Delivery & Ownership Expectations

This role will suit you if you:

• Are comfortable working with evolving requirements and can make progress without needing everything fully defined upfront
• Enjoy delivery-focused work where outcomes, timelines, and impact matter
• Balance technical quality with commercial, cost, and time constraints
• Take ownership and accountability for delivering work end-to-end
• Are comfortable working on client-facing projects with real-world pressure and expectations

This role may not be the right fit if you prefer:

• Needing fully defined, fixed requirements before starting
• Open-ended product exploration over delivery and outcomes
• Optimising primarily for technical elegance regardless of cost or timelines
• Low-pressure environments with limited accountability
• Internal-only projects with flexible or undefined deadlines

💶 Compensation

Exact hourly rate will be discussed during the recruitment process.

(no benefits will be provided).

📍 Location

You must be based in the European Union and legally able to provide services on a B2B contract for a Malta-registered company.

Important note: This is a remote-first role. No relocation or visa sponsorship is available for this position. Ideal candidates must already have the legal right to work remotely from their country of residence and invoice a company registered in Malta under a B2B arrangement.

💬 Equal Opportunity

At Cleverbit, we’re committed to building an inclusive workplace where everyone feels respected and valued. We welcome candidates from all walks of life, regardless of age, gender, ethnicity, religion, disability, or sexual orientation.