Backend Engineer (Remote)
Hired · Germany
- Hybrid
- Contract
- $87,360 / year
- Germany
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Job highlights
- Design and validate JSON schemas for data extraction.
- Work with complex PDF documents and structured data.
- Build APIs and validation frameworks for AI systems.
- Collaborate with cross-functional teams on data architecture.
- Remote contract role with global AI exposure.
About the role
Backend Engineer JSON Schema Developer (Remote)
We are hiring for one of our clients, seeking a Backend Engineer (JSON Schema Developer) to work on a contract basis. In this role, you will design, build, and validate JSON schemas to ensure high-quality data extraction from complex PDF documents. Your work will directly influence how next-generation AI systems learn, reason, and perform across domains such as finance, healthcare, and engineering. The role leverages your expertise in data modeling and schema design to create robust APIs and validation frameworks that power reliable AI training and agent development.
Key Responsibilities:
- Review and analyze 25–150-page PDF documents to identify and model key data points relevant to domain-specific use cases.
- Design comprehensive JSON extraction schemas from scratch, determining optimal field extraction logic, data types, and structural organization—including deep nesting and repetition patterns.
- Embed field-level validation logic directly into JSON schemas, such as sum requirements, null-value testing, and conditional pattern matching.
- Define and maintain API contracts that ensure consistency between schema definitions and downstream system integrations.
- Collaborate with cross-functional teams to align schema design with data architecture goals and model evaluation objectives.
Required Skills & Qualifications:
- Proficiency in JSON Schema specification and its application in data modeling and validation workflows.
- Experience designing schemas for real-world document processing, including handling complex nesting and repetition structures.
- Strong understanding of data typing, validation rules, and error handling within schema definitions.
- Familiarity with API contract design and integration patterns, including OpenAPI/Swagger and schema-first development.
- Ability to analyze unstructured documents (e.g., PDFs) and extract structured representations suitable for AI training pipelines.
- No prior AI experience is required—your domain expertise and technical skill in schema development are the focus.
More About the Opportunity:
This opportunity offers direct impact on the development of frontier AI systems by ensuring high-quality, reliable data inputs. You will contribute to a scalable platform used by labs and enterprises to train models and build AI agents. The role provides global exposure to AI-driven workflows and the chance to work with top-tier talent in a fast-growing network of domain experts.
Equal Opportunity Employer:
We hire based on skills and expertise. All qualified candidates are welcome regardless of background, experience, or prior employment history. Applications are reviewed solely on demonstrated technical ability and qualifications.
Key skills/competency:
- JSON Schema
- Data Modeling
- API Contracts
- Document Processing
- Data Validation
- Schema Design
- PDF Analysis
- Structured Data Extraction
- AI Training Data
- Backend Development
Skills & topics
- Backend Engineer
- JSON Schema
- Data Modeling
- API Development
- Schema Design
- Document Processing
- Data Validation
- Remote
- Contract
- AI
How to get hired
- Tailor your resume: Highlight your JSON Schema expertise and experience with complex data modeling for AI training data.
- Showcase document analysis skills: Provide examples of how you've extracted structured data from unstructured documents like PDFs.
- Emphasize validation logic: Detail your experience embedding validation rules within schemas for robust data quality.
- Prepare for technical questions: Be ready to discuss API contract design and schema-first development principles.
Technical preparation
Behavioral questions
Frequently asked questions
- What is the primary focus of the Backend Engineer (JSON Schema Developer) role at Hired?
- The primary focus of this role is to design, build, and validate JSON schemas to ensure high-quality data extraction from complex PDF documents, directly supporting the development of AI systems.
- Is prior AI experience required for this Backend Engineer position?
- No, prior AI experience is not required. The client is looking for strong technical skills in schema development, JSON Schema specification, and data modeling, along with domain expertise.
- What kind of documents will I be working with as a JSON Schema Developer?
- You will be working with complex PDF documents, typically ranging from 25 to 150 pages, from various domains like finance, healthcare, and engineering.
- What are the key responsibilities for this remote contract role?
- Key responsibilities include analyzing PDFs, designing JSON extraction schemas from scratch, embedding validation logic, defining API contracts, and collaborating with cross-functional teams.
- How does this role contribute to AI development at Hired?
- Your work ensures high-quality, reliable data inputs for training AI models and building AI agents, thus directly impacting the performance and capabilities of next-generation AI systems.
- What specific technical skills are most important for this JSON Schema Developer role?
- Proficiency in JSON Schema specification, experience designing schemas for document processing, strong understanding of data typing and validation rules, and familiarity with API contract design are crucial.
- What is the work arrangement for this Backend Engineer position?
- This is a fully remote contract position, allowing you to work from anywhere.
- How are applications reviewed for this Backend Engineer role?
- Applications are reviewed solely on demonstrated technical ability and qualifications, focusing on skills and expertise rather than background or prior employment history.
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