Senior Python Engineer at Siteground

YOUR ROLE: At SiteGround we are currently in a high-growth phase, expanding our software engineering teams as we are scaling our own suite of products. This is a Remote-First role, with occasional company-covered visits to our headquarters in Sofia. This role is for people who like the “product + engineering” intersection: you’ll work on backend systems where small architectural choices show up immediately in UX, cost, latency, reliability, and safety. A key part of everyday work: we actively use and integrate the major model ecosystems—OpenAI, Google (Gemini), and Anthropic—and you’ll regularly make pragmatic decisions around model choice, routing, fallback strategies, and evaluation. In the role of Senior Python Engineer, you’ll build and evolve the Python services behind our AI experiences — most notably AI Studio and Coderick AI. You’ll help build the APIs and infrastructure that make AI features fast, scalable, and dependable. Typical problems you’ll help solve: • Turning “cool demo” flows into repeatable product behavior; • Making LLM-powered features observable (tracing, metrics), debuggable, and safe; • Balancing cost vs. quality vs. latency, with real traffic patterns; • Building reliable tool-calling / agent workflows, and integrating external systems. YOUR RESPONSIBILITIES: • Design, develop, and maintain scalable services using Python + FastAPI; • Build and version APIs used by internal tools and customer-facing products; • Collaborate closely with AI engineers on core AI functionality (prompt/tool orchestration, retrieval patterns, guardrails, performance); • Rapidly prototype, then harden: ship features, measure outcomes, iterate; • Partner with platform engineers on deployment, monitoring, and production operations; • Troubleshoot incidents, improve stability, and reduce operational load over time; • Develop internal tooling that improves how teams adopt AI across the company. OUR EXPECTATIONS: • 5+ years of professional Python experience (or equivalent strong track record); • Solid engineering fundamentals: clean code, testing, reliability, and performance; • Experience building production web services with FastAPI (or similar framework); • Good working knowledge of SQL and experience with PostgreSQL (or another RDBMS); • Comfortable with Python packaging/dependency management; • Hands-on curiosity and experience integrating LLMs (personal or professional); • Familiarity with Linux environments, VMs, and shell scripting; • Clear communication and a collaborative mindset (AI + platform + product). GREAT ADVANTAGE WILL BE: • Front-end familiarity (JS/React/CSS) for end-to-end prototyping and better product intuition; • Experience with other languages and distributed systems patterns; • Understanding of ML/AI concepts (helpful for tighter collaboration); • Experience with AI frameworks, Building AI Agents, Context Management. WHAT WE OFFER: • Working on in-house built products, using the latest technologies; • Competitive salary with achievement bonus; • Premium health insurance; • Reduced working hours every Friday; • Sponsorship for worldwide conferences of your choice with full company coverage of business expenses; • Free office restaurant with our own chef team; • Free access to our in-office gym with professional instructors; • Free HIIT, Prama, Yoga, Pilates, and table tennis classes in our HQ office; • Free Multisport or CoolFit card; • Additional days off for long service and volunteering; • Anniversary and company gifts; • Knowledge-sharing at multiple meetups and mini conferences in our offices. If this sounds like something you’d be interested in, we’d love to hear from you!   Please note: Only resumes submitted in English will be considered for this position. Only shortlisted candidates will be contacted for further steps.