Java Senior Software Engineer
07800 Ibiza, Balearic Islands, JR Spain
About Us
We are a software and data platform that brings carbon intelligence to global commodity industries.
By connecting supply-chain data, regulations, and real-world emissions, we enable producers, traders, consumers, and regulators to understand and manage the true carbon intensity of their decisions. Our multi-tenant B2B SaaS platform is intelligence-first — AI and automation are built into the user experience by default. We're currently in Stealth mode, but will launch in late Q4 2025.
The role
We’re looking for a software engineer who wants to solve real business problems through clean, reliable, and scalable software. You’ll join a small, sharp, and collaborative team where engineers shape architecture, product, and delivery decisions alike. You’ll work primarily across our backend stack, but you’ll also have the opportunity to touch data and frontend systems as we evolve.
What you’ll do
* Design and build backend services that power our data and intelligence platform.
* Own features end-to-end—from understanding business context to shipping and maintaining production code.
* Collaborate directly with product and data teams to translate complex domain logic into simple, maintainable software.
* Contribute to a high‑quality codebase through reviews, clear design, and thoughtful trade‑offs.
* (Optional) Explore and contribute to related areas such as data pipelines, orchestration, or frontend development.
Primary technologies for the role
* Python
* Async frameworks (FastAPI, Sanic, etc.)
* PostgreSQL, Redis
* AWS or equivalent cloud services
What we’re looking for
* Strong fundamentals in Python and web backend development.
* Solid understanding of databases, async execution, and APIs.
* Curious about how technology creates business value—beyond just the task.
* Comfortable working independently, with a sense of ownership and follow‑through.
* (Bonus) Experience in data‑heavy systems, B2B SaaS, or tech‑based consulting.
* (Nice to have) Interest in commodities, energy transition, or carbon markets.
Why Us
* Focus on building high‑quality scalable solutions, not just keeping lights on.
* A chance to shape software that matters in the global energy transition.
* Monthly team meet‑ups across Europe (travel covered).
How to apply
* Send us a short note about yourself, what excites you about the role, and a link to your profile (CV, GitHub, LinkedIn, or others).
Software Backend Engineer
07800 Ibiza, Balearic Islands, PropHero
PropHero, the AI & data‑powered platform simplifying property investment, is on a fast‑track to success! Backed by global VCs and founded by McKinsey Alumni, we’re expanding our team constantly. At PropHero, we’re building the property investment future—making it as simple as investing in shares or ETFs.
How will you contribute to PropHero?
Your mission as a Backend Software Engineer will be to design and build the robust, scalable, and high‑performing backend systems that form the backbone of the PropHero platform, leveraging Node.js, TypeScript, and Serverless architecture to deliver core APIs and services. You will collaborate across teams to define requirements, deliver features, and continuously improve architecture.
Key responsibilities
* Develop and optimize robust backend services and APIs using Node.js, TypeScript, and Serverless architecture.
* Collaborate with frontend engineers, designers, and product managers to define technical requirements and deliver seamless features.
* Ensure backend systems are optimized for scalability, performance, and reliability.
* Write clean, maintainable, testable code and advocate best practices.
* Actively participate in architectural decisions and suggest new tools or strategies to improve our platform.
What will make you succeed with us?
Experience
* Minimum 5 years of professional backend development.
* Proficiency in Node.js and TypeScript.
* Experience with serverless architectures (AWS Lambda, etc.).
* Deep practical knowledge of SOLID principles and clean code.
General Skills
* Strong system‑architecture design and scalability.
* Proactive, autonomous, and excellent communication.
* Strong problem‑solving and analytical skills.
* Continuous improvement mindset.
* Proven use of AI coding assistants to accelerate delivery while maintaining quality.
Tools
* Git, CI/CD pipelines.
* REST API standards and security best practices.
* AI tools such as Cursor to accelerate development cycles.
Language
* Advanced English; all internal communication is in English within our globally distributed team.
Culture Fit
* Optimistic, passionate about building technical foundations.
* Results‑driven, eager to innovate, comfortable in a fast‑paced startup.
* AI enthusiast who proactively introduces new tools.
Benefits
* Remote work with flexible environment.
* Learning and development opportunities.
* Great teamwork and ownership.
* Early‑stage startup with career growth potential.
* Competitive economic package.
Backend Engineer – CQuel
CQuel’s mission is to accelerate the decarbonisation of commercial‑real‑estate. We provide a SaaS platform to help consultancies and ESG teams transform themselves into an implementation engine, enabling brief writing, tendering, and supplier vetting—all in one place.
We’re searching for a Backend Engineer with experience in application development, database design, and a bit of devops to take charge of and own our stack. You’ll be supported by a frontend engineer (if you have some of these skills) but you’ll be the main protagonist in our architecture.
Key responsibilities
* Make decisions around system design and prioritisation.
* Be a trusted voice in the business for the “right thing to do.”
* Take early concepts and deliver APIs quickly.
* Architect pragmatic choices and integrate with frontend stacks.
Requirements
* Extensive knowledge of Python/Django.
* Deploying, debugging, and scaling full‑stack applications.
* Experience with GitHub Actions or similar CI/CD platforms.
* PostgreSQL experience or similar.
* At least a good stint in a B2B product environment.
* Passion for our mission.
Things we look for
* Collaborative; works well with teams within and outside engineering.
* Self‑starting; brings early concepts to API.
* Architecture savvy; practical choices.
* Broad skills; comfortable with AWS, CI/CD, and integrating with React.
* Good communication; raises issues early.
* Self‑aware; knows strengths and limits.
Ideally
* Experience in a small team with German-speaking clients.
* Experience with AI/ML products.
* Understanding of decarbonisation and/or building industry.
* Experience with SAML/SSO authentication workflows.
Backend Engineer – Remoto (Ibiza)
We have an ambitious goal to migrate a legacy system written in HLASM from the mainframe to a cloud‑based Java environment for a large airline company in the USA.
Responsibilities
* Help perform the migration of the client platform.
* Write Java and Python code following the new architecture.
* Troubleshoot, debug, and resolve issues within the new Java system.
* Collaborate with client teams to align with project goals and deliver high‑quality solutions.
* Maintain and fine‑tune Gen AI application that supports the migration process.
Must have
* Proficiency in Java development (5+ years).
* Proficiency in Python development (5+ years).
* Experience with any cloud platforms and services.
* Deep understanding of enterprise application architecture patterns.
* Strong problem‑solving and debugging skills.
* Experience working in distributed teams with US customers.
* Excellent communication skills.
Nice to have
* Familiarity with large‑scale system migrations and modernization.
* Experience with HLASM or other low‑level languages.
* Familiarity with Generative AI.
* Prior experience in banking or financial services industry.
* Knowledge of performance tuning and optimization in cloud environments.
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