{"id":1717343,"url":"https://alion.io/job/deepinfra-software-engineer-intern-sofia-bulgaria","title":"Software Engineer Intern - Sofia, Bulgaria","company":{"id":48033,"name":"DeepInfra","domain":"deepinfra.com","url":"https://alion.io/company/deepinfra","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Gem","truth_index":{"grade":"C","score":68,"open_postings":17,"ghost_share":0.529,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-06T05:45:30Z"}},"role":"Backend","role_family":"Backend","seniority":"intern","employment_type":"internship","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Sofia, Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"C++","optional":false},{"name":"CUDA","optional":false},{"name":"CUDA Toolkit","optional":false},{"name":"Diffusers","optional":false},{"name":"Edge AI","optional":false},{"name":"Git","optional":false},{"name":"Machine Learning","optional":false},{"name":"Multimodal AI","optional":false},{"name":"NCCL","optional":false},{"name":"NumPy","optional":false},{"name":"OpenAI","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"PyTorch C++","optional":false},{"name":"SciPy","optional":false},{"name":"TensorFlow","optional":false},{"name":"TensorFlow C++","optional":false},{"name":"Transformers","optional":false}],"status":"live","first_seen_at":"2026-10-02T11:13:04Z","employer_posted_date":"2026-10-02","last_verified_at":"2026-10-06T20:09:04Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":3},"description":"DeepInfra is seeking a talented and motivated Software Engineering Intern to join our Sofia-based team. As an intern, you will be working closely with our experienced engineering team to design, develop, and deploy the top open AI models at scale. This is an excellent opportunity to gain hands-on experience in building scalable and efficient software systems, while working on cutting-edge AI models and algorithms.\nWhat You’ll Do\nCollaborate with the engineering team to design, develop, and test inference solutions for the top AI models.\nImplement and optimize AI models using Python, C++, CUDA, NCCL\nMonitor and maintain the live service.\nWork on feature development, bug fixing, and code reviews to ensure high-quality software delivery\nParticipate in daily stand-ups, code reviews, and design discussions to ensure seamless collaboration\nStay up-to-date with industry trends and advancements in AI and machine learning\nTry new things\nShip stuff\nWhat You Bring\nCurrently pursuing a Bachelor's or Master's degree in Computer Science, Computer Engineering, or a related field\nStrong fundamental knowledge in computer science, including data structures, algorithms, and software design patterns\nProficiency in Python, including experience with AI/ML libraries and frameworks (e.g., NumPy, pandas, SciPy, TensorFlow, PyTorch)\nFamiliarity with AI models, Transformers and Diffusers\nExperience with version control systems (e.g., Git) and agile development methodologies\nExcellent problem-solving skills, with the ability to debug and optimize code\nStrong communication and teamwork skills, with the ability to effectively collaborate with cross-functional teams\nWhy DeepInfra\nWork on cutting-edge AI model serving - the systems that power the next generation of LLMs and multimodal models.\nSmall team, huge impact: your work ships directly to customers.\nOpportunity to learn from engineers building high-performance inference at scale.\nFast-paced environment with ownership, autonomy, and end-to-end responsibility.\nHow we work\nThree traits define the people who thrive here, and this role leans on all three.\nInitiative. We take ownership and step in where we can add value. Whether it’s starting something new, improving what exists, or helping move ideas forward, we aim to be proactive and thoughtful in how we contribute.\nDrive. We’re energized by hard problems. Building AI infrastructure is complex, and we lean into that. We care about doing things well, moving fast, and continuously improving - because solving meaningful challenges is what motivates us.\nGrit. Things don’t always work on the first try - and that’s expected. We stay persistent, adapt quickly, and learn as we go. We take setbacks seriously, but not personally, and use them to get better.","description_format":"text","description_chars":2768,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Bulgaria","iso":"BG","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Compute & Inference"],"lifecycle":[{"event":"open","at":"2026-10-02T19:07:26Z"}],"visa":[],"liveness":{"score":60,"band":"ok","label":"Likely open","p_open":1,"p_active":0.602,"p_room":1,"age_days":3,"expected_fill_days":22,"reasons":["conf:1","stale_co","win:early","comp:junior"],"computed_at":"2026-10-06T05:45:30Z"},"pay":null,"html_url":"https://alion.io/job/deepinfra-software-engineer-intern-sofia-bulgaria","json_url":"https://alion.io/job/deepinfra-software-engineer-intern-sofia-bulgaria.json","meta":{"generated_at":"2026-10-06T21:45:51Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":1540,"day_limit":5000,"remaining_today":3460,"minute_limit":60,"resets_at":"2026-10-07T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":48033},"rest":"https://alion.io/mcp/rest/get_company?id=48033"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fdeepinfra-software-engineer-intern-sofia-bulgaria"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fdeepinfra-software-engineer-intern-sofia-bulgaria"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fdeepinfra-software-engineer-intern-sofia-bulgaria"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/deepinfra-software-engineer-intern-sofia-bulgaria\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fdeepinfra-software-engineer-intern-sofia-bulgaria"}]}