Senior Python Engineer (Contract)

Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients.  Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.

We are seeking a Senior Backend Engineer (Python Platform) to own and evolve the backend foundation of AI-driven healthcare and contact center platforms. This is a hands-on engineering role focused on designing and building scalable APIs, backend services, and data systems that power production-grade AI-enabled applications. You will work closely with product, frontend, and data teams to deliver reliable, secure, and scalable backend capabilities while helping define backend architecture, engineering standards, and operational best practices. This role goes beyond feature delivery  you will contribute to long-term platform strategy, mentor engineers, and help shape systems that support retrieval-based and agent-driven workflows. The ideal candidate is experienced in distributed backend systems, graph-based data platforms, cloud-native infrastructure, and production observability, with strong ownership and architectural decision-making capabilities.

• →Design and build scalable Python services and APIs (REST/GraphQL) for our core product.
• →Define and evolve a resilient backend architecture that can grow with the product.
• →Own database schema design, data modeling, and performance tuning (SQL and ORMs).
• →Design and operate knowledge-graph powered services, including graph data modeling and query performance.
• →Implement observability (logging, metrics, tracing) and operational runbooks.
• →Collaborate closely with frontend, data, and product to define contracts and deliverables.
• →Secure the platform (authn/z, secrets, rate limiting, data protection).
• →Mentor engineers on backend best practices and code quality.

• Extensive production experience building backend systems in Python.
• Hands-on experience with knowledge graphs and graph data stores (e.g., Neo4j, Neptune, ArangoDB), including schema/ontology design and query optimization.
• Strong SQL experience and familiarity with ORMs (SQLAlchemy, Django ORM, etc.).
• Experience designing APIs and distributed systems with reliability and performance in mind.
• Solid understanding of cloud infrastructure (AWS/GCP/Azure), containers, and IaC.
• Experience with monitoring/observability stacks (e.g., OpenTelemetry, Prometheus, Grafana).
• Ability to decompose problems, communicate tradeoffs, and drive projects end-to-end.

• TypeScript knowledge and ease collaborating across TypeScript or Go services.
• Experience with agentic workflows, including RAG systems (retrieval pipelines, vector stores, embeddings), agent orchestration, and tool/function calling in production.
• Familiarity with event-driven architectures, queues/streams (Kafka/SQS/PubSub).
• Background with security and compliance basics (OWASP, SOC2 practices).
• Exposure to data/analytics workflows or ML-adjacent services.

• Candidates must be authorized to work in and located in Mexico.