Machine Learning Engineer Jobs in Sofia

Machine Learning Engineer jobs in Sofia hiring now at vetted startups and product companies on Alion, updated daily. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.

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Gramian Consulting Group

gramianconsultinggroup.com
Gramian Consulting Group is an international management and technology consulting firm based in Los Angeles, California. The firm provides executive-level advisory services, digital transformation strategy, software engineering, and corporate restructuring for middle-market and enterprise clients across diverse industries. By combining high-level strategic planning with hands-on technology execution, the company helps client organizations modernize their operations, optimize revenue models, and scale business growth efficiently.
gramianconsultinggroup.com • HQ: Los Angeles, United States • Professional Services
HQ: Los Angeles, United States • Professional Services
Verified live · 7 hours ago 3 days ago

Web Researcher (AI Benchmarking)

$62k – $106k per year (Estimated) • Remote (Argentina, Bulgaria, Mexico, Nigeria, Poland) • Bachelor's Degree • Contractor
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ElevenLabs

elevenlabs.io
ElevenLabs is transforming human-technology interaction with AI research and products. Powering the best enterprises, creators, and developers. From ElevenAgents for customer experience, ElevenCreative for content creation, to the leading AI voice generator.
elevenlabs.io • HQ: New York, United States • HQ: London, United Kingdom • AI Agents • LLM & Generative AI • Artificial Intelligence • Speech & Audio AI • 51-200 employees • Est. 2022
HQ: New York, United States • HQ: London, United Kingdom • AI Agents • LLM & Generative AI • Artificial Intelligence • Speech & Audio AI • 51-200 employees • Est. 2022
Verified live · 1 hour ago 4 days ago

Research Engineer - Inference

$105k – $220k per year (Estimated) • Remote (United States, United Kingdom, Bulgaria, Poland) • Full-Time
CUDA
CUDA Toolkit
ElevenLabs
Knowledge Distillation
Quantization
SGLang
TensorRT
Triton
vLLM
DevOps
GitHub
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Open 404 daysVerified live · 1 hour ago 1 year ago

Engineering - Internal AI Transformation

$133k – $290k per year (Estimated)BerlinAmsterdamWarsawSofiaDublin • Remote (United States, Germany, United Kingdom, Bulgaria, Canada) • Full-Time
Python
SQL
AI/ML
AI Agents
Claude
ElevenLabs
LLM
RAG
LLM Guardrails
DevOps
Docker
GCP
Kubernetes
Management
Slack
n8n
Marketing
Salesforce
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Open 622 daysVerified live · 1 hour ago 2 years ago

Research Engineer

$45k – $94k per year (Estimated) • Middle • 3+ years exp • Remote (United States, Germany, United Kingdom, Bulgaria, Poland) • Full-Time • Middle
ElevenLabs
Post-training
DevOps
GitHub
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Poolside

poolside.ai
Poolside is a foundation model company bringing intelligence to everywhere work gets done. Our mission is to drive abundance for humanity by creating artificial general intelligence.
poolside.ai • London • Hardware • LLM & Generative AI • Artificial Intelligence
London • Hardware • LLM & Generative AI • Artificial Intelligence
Open 103 daysVerified live · 1 day ago 3 months ago

Member of Engineering (Pre-training / Data Research)

Remote (EMEA, United States) • Full-Time
Python
AI/ML
LLM
Prompt Engineering
Synthetic Data
Tokenization
Post-training
Pre-training
AI Agents
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Verified live · 1 day ago 1 month ago

Member of Engineering (Inference Infrastructure)

Remote (EMEA, United States) • Full-Time
Go
AI/ML
Reinforcement Learning
AI Agents
DevOps
Kubernetes
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tryolabs

tryolabs.com
Tryolabs is a specialized AI and machine learning solutions company that helps companies create business value by partnering with them through their AI journey.
tryolabs.com • Data & Analytics • Machine Learning • Artificial Intelligence • Est. 2009
Data & Analytics • Machine Learning • Artificial Intelligence • Est. 2009
$107k – $237k per year (Estimated) • Senior • Remote • Full-Time • Senior
Python
AI/ML
Scikit-learn
XGBoost
DevOps
AWS
Azure
CI/CD
GCP
Terraform
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Neurons Lab

neurons-lab.com
Neurons Lab helps financial institutions move from AI-curious to AI-enabled. We deliver AI training programs and custom AI agents designed for regulated environments — from pilot to production, at scale.
neurons-lab.com • Madrid • AI Agents • Financial Services • Artificial Intelligence • 501-1000 employees • Est. 2019
Madrid • AI Agents • Financial Services • Artificial Intelligence • 501-1000 employees • Est. 2019
Verified live · 6 hours ago 5 days ago

AI Architect (Voice AI)

$77k – $138k per year (Estimated) • Staff+ • 6+ years exp • Remote (Bulgaria, Cyprus, Czech Republic, Hungary, Italy) • Contractor • Architect • English
Python
TypeScript
AI/ML
AWS Bedrock
Claude
Copilot
Langfuse
LLM
Prompt Engineering
LLM Guardrails
LiveKit
Mobile
Twilio
DevOps
AWS
Chips/EDA
PoC Library
Analytics
A/B Testing
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Verified live · 6 hours ago 1 month ago

Technical AI Engagement Lead

$74k – $129k per year (Estimated) • Lead • Madrid • Remote (Germany, Bulgaria, Cyprus, Czech Republic, Hungary) • Full-Time • Staff • Ukrainian
AWS Bedrock
Claude
Claude Code
Cursor
LiteLLM
LLM
OpenRouter
LLM Guardrails
OpenAI Codex
AI Agents
Model Context Protocol
DevOps
AWS
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NewRocket

newrocket.com
Our core values tell our story:Excellence. Creativity. Integrity. Teamwork. Empathy.
newrocket.com • San Diego • Zurich • Artificial Intelligence • Design & Creative • Financial Services • Software • IT Consulting • Information Technology • 201-500 employees
San Diego • Zurich • Artificial Intelligence • Design & Creative • Financial Services • Software • IT Consulting • Information Technology • 201-500 employees
Verified live · 11 hours ago 6 days ago

Agentic AI Architect-Anthropic-Netherlands/EMEA

$118k – $260k per year (Estimated) • Staff+ • 10+ years exp • Remote (Europe) • Bachelor's Degree • Architect
Python
SQL
Databases
MySQL
PostgreSQL
Snowflake
AI/ML
AI Agents
Anomaly Detection
Claude
Embeddings
Fine-tuning
Function Calling
Hallucination
LLM
NLP
NumPy
Pandas
Prompt Engineering
PyTorch
RAG
Reranking
Scikit-learn
Sentiment Analysis
Spark
TensorFlow
Vertex AI
Amazon SageMaker
Anthropic
Context Engineering
Hugging Face
Human-in-the-Loop
Structured Outputs
Claude Code
LangChain
LangGraph
LlamaIndex
Model Context Protocol
Semantic Kernel
LLM Guardrails
LLMOps
DevOps
AWS
AWS Lambda
Azure
GCP
Vector
Amazon S3
CI/CD
Docker
Kubernetes
Analytics
Matplotlib
Power BI
Seaborn
Tableau
ETL/ELT
Management
ServiceNow
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Red Hat Developer

redhat.com
Red Hat is the world’s leading provider of open source solutions, using a community-powered approach to provide reliable and high-performing cloud, virtualization, storage, Linux, and middleware technologies. Red Hat also offers award-winning support, training, and consulting services.
redhat.com • HQ: Somerville, United States • Software • Artificial Intelligence • Information Technology • 1001-5000 employees • Est. 1993
HQ: Somerville, United States • Software • Artificial Intelligence • Information Technology • 1001-5000 employees • Est. 1993
Verified live · 2 hours ago 7 days ago

EMEA AI Architect

$109k – $238k per year (Estimated) • Staff+ • 5+ years expUnited KingdomIreland • Remote (EMEA) • Full-Time • Architect • English: C1
Fine-tuning
Edge AI
LLM Guardrails
AI Agents
DevOps
Kubernetes
OpenShift
Red Hat
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Neo4J

neo4j.com
Neo4j is the world's leading graph database platform, engineered specifically to store, query, and analyze highly connected data. Unlike traditional relational databases that rely on rigid tables and costly JOIN operations, Neo4j models data naturally using nodes (entities), relationships (connections), and properties (key-value attributes).
neo4j.com • HQ: San Mateo, United States • Big Data • Information Technology • Database Management
HQ: San Mateo, United States • Big Data • Information Technology • Database Management
Verified live · 2 hours ago 7 days ago

AI Tech Lead - GraphAware Hume

Lead • Remote (EMEA) • Cofounder • Staff
Neo4j
AI/ML
Knowledge Graph
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Synthesia

synthesia.io
Synthesia is an AI video generation platform that enables users to create professional, studio-quality videos from plain text scripts without needing traditional cameras or film crews. The platform utilizes hyper-realistic digital avatars and natural synthetic voice models to deliver localized video content across dozens of languages in minutes. Widely adopted by corporate enterprises, Synthesia streamlines corporate training, customer onboarding, and internal communications at scale.
synthesia.io • HQ: London, United Kingdom • Software • Artificial Intelligence • Generative Video • Video & Image Processing Software • 51-200 employees • Est. 2017
HQ: London, United Kingdom • Software • Artificial Intelligence • Generative Video • Video & Image Processing Software • 51-200 employees • Est. 2017
Verified live · 11 hours ago 8 days ago

Senior Applied Research Engineer - Video

$93k – $236k per year (Estimated) • Senior • Remote (Europe) • Full-Time • Senior
Python
AI/ML
DeepSpeed
Diffusion Models
PyTorch
FSDP
CUDA
CUDA Toolkit
DevOps
CI/CD
Datadog
AWS
Docker
SLURM
GitHub
Design
Webflow
Management
Miro
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Verified live · 11 hours ago 1 month ago

ML Platform Engineer

Remote (Europe) • Full-Time
Python
AI/ML
AI Agents
LLM
DevOps
Datadog
GitHub Actions
Kubernetes
Terraform
GitHub
Design
Webflow
Management
Miro
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Verified live · 11 hours ago 1 month ago

Staff Research Engineer - Multimodal Generative Modelling

$136k – $298k per year (Estimated) • Staff+ • Remote (Europe) • Full-Time • Staff
Fine-tuning
Knowledge Distillation
Multimodal AI
PyTorch
Tokenization
DPO
Post-training
Time Series Forecasting
Diffusion Models
DevOps
Datadog
Design
Webflow
Management
Miro
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Provectus

provectus.com
Provectus is a global technology consulting firm that specializes in delivering innovative software solutions to businesses of all sizes. We have a proven track record of success in helping our clients achieve their strategic goals by leveraging our deep expertise in cloud computing, big data, and artificial intelligence. Provectus is a trusted partner for organizations looking to transform their digital landscape and gain a competitive advantage in today's dynamic marketplace.
provectus.com • HQ: New York, United States • System Integration • Biotechnology • Data & Analytics • Est. 2010
HQ: New York, United States • System Integration • Biotechnology • Data & Analytics • Est. 2010
Verified live · 27 min ago 11 days ago

Senior AI/ML Engineer (GenAI, AWS)

Senior • 5+ years exp • Remote (Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Montenegro) • Full-Time • Senior
Python
TypeScript
Go
Rust
AI/ML
AWS Bedrock
Claude
Claude Code
LLM
RAG
Anthropic
AWS Bedrock AgentCore
LLM Guardrails
OpenAI
AI Agents
Function Calling
AgentOps
Airflow
NLP
Spark
A2A
LLM Evaluation
LLMOps
Model Context Protocol
DevOps
AWS
AWS Lambda
Azure
GCP
Amazon ECS
Amazon S3
CI/CD
GitHub Actions
GitLab CI
Kubernetes
GitHub
GitLab
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Solidgate

solidgate.com
Solidgate is a financial technology company headquartered in London, United Kingdom, and founded in 2018. The company provides a payment orchestration platform that enables businesses to manage multiple payment service providers, optimize transaction routing, and handle subscription billing, fraud prevention, and tax calculation. It serves global clients in the software-as-a-service and e-commerce sectors, offering infrastructure that supports card acquiring, alternative payment methods, and multi-currency treasury operations.
solidgate.com • HQ: London, United Kingdom • Commerce • Fraud Detection • Cybersecurity • Billing & Invoicing • Software • FinTech • Financial Services • Payments • 201-500 employees • Est. 2018
HQ: London, United Kingdom • Commerce • Fraud Detection • Cybersecurity • Billing & Invoicing • Software • FinTech • Financial Services • Payments • 201-500 employees • Est. 2018
Verified live · 1 hour ago 11 days ago

Senior Machine Learning Engineer

$81k – $206k per year (Estimated) • Senior • 5+ years exp • Remote (Europe) • Full-Time • Senior
Edge AI
Analytics
A/B Testing
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Sword Health

swordhealth.com
Sword Health is pioneering AI Care-an AI-first approach to healthcare that combines artificial intelligence with clinical expertise to improve access, outcomes, and cost at scale. Initially transforming pain care with AI at its core, Sword has expanded into women's health, movement health, and mental health, delivering hyper-personalized treatment programs available anytime, anywhere. Since 2020, more than 700,000 members across three continents have completed over 10 million AI sessions, helping 1,000+ enterprise clients-including employers, health plans, and governments-avoid more than $1 billion in unnecessary healthcare costs.
swordhealth.com • Porto • Medical AI • Physical Therapy • Digital Health • Est. 2014
Porto • Medical AI • Physical Therapy • Digital Health • Est. 2014
$70k – $99k per year • Senior • Remote (Europe) • Full-Time • Senior
Fine-tuning
Knowledge Distillation
LLM
AI Agents
Function Calling
RLHF
DPO
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Payhawk

payhawk.com
Payhawk is a London company founded in 2018 that combines corporate cards, expense management and accounts payable in one system. Its platform automates approvals, receipt capture and accounting reconciliation for finance teams across Europe. The company operates engineering hubs in Sofia and serves mid-market and enterprise customers.
payhawk.com • HQ: London, United Kingdom • Est. 2018
HQ: London, United Kingdom • Est. 2018
Verified live · 1 hour ago 1 month ago

Content & AI Enablement Team Lead

Lead • 7+ years expIn office (Sofia, Bulgaria) • Staff • English: C1
AI Agents
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Cast AI

cast.ai
CAST AI is an AI-driven cloud automation and Kubernetes cost optimization platform built to help enterprises manage, scale, and secure their cloud infrastructure. Founded in 2019 and headquartered in Miami, Florida, the company automates cloud operations across major hyper-scalers including Amazon Web Services (AWS), Google Cloud Platform (GCP), and Microsoft Azure.
cast.ai • HQ: Miami, United States • Information Technology • Virtualization • DevOps
HQ: Miami, United States • Information Technology • Virtualization • DevOps
Open 382 daysVerified live · 25 min ago 1 year ago

Senior ML Engineer | Kimchi (LLM Inference Optimization)

Equity • Senior • Remote (EU) • Visa sponsorship • Internship • Senior
Python
Databases
ClickHouse
PostgreSQL
AI/ML
CUDA
CUDA Toolkit
LLM
Perplexity
PyTorch
Quantization
SGLang
TensorRT
TensorRT-LLM
TPOT
vLLM
Hugging Face
DevOps
Akamai
ArgoCD
AWS
Azure
GCP
GitLab CI
Grafana
Kubernetes
Loki
Prometheus
GitLab
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LiveKit

livekit.io
LiveKit is an open-source real-time audio, video, and AI voice infrastructure platform headquartered in San Francisco. The company provides cloud and developer infrastructure designed to build ultra-low-latency video conferencing, live streaming, and interactive multimodal AI voice agents into web and mobile applications. Powered by flexible SDKs and scalable server orchestration, LiveKit is widely used by developers and enterprise teams to deploy real-time voice and video applications at global scale.
livekit.io • HQ: San Francisco, San Jose, United States • Artificial Intelligence • AI Agents • Speech & Audio AI • Est. 2021
HQ: San Francisco, San Jose, United States • Artificial Intelligence • AI Agents • Speech & Audio AI • Est. 2021
Top 25% payVerified live · 2 hours ago 13 days ago

Research Engineer (Reinforcement Learning)

$135k – $300k per year • Equity • Remote (EMEA, North America) • Full-Time
Python
AI/ML
Synthetic Data
PEFT
LiveKit
OpenAI
Post-training
Fine-tuning
Llama
LoRA
Qwen
Reinforcement Learning
SGLang
vLLM
FSDP
GRPO
LLM Evaluation
Marketing
Salesforce
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Toloka AI

toloka.ai
Toloka is a data company founded in 2014 and headquartered in Amsterdam that supplies human-generated training, fine-tuning and evaluation data for artificial intelligence systems. It began as a large-scale crowdsourcing platform and has repositioned around expert work, combining domain specialists, machine learning tooling and quality control pipelines to produce reasoning traces, preference rankings and agentic task data. Operating within the Nebius group and backed by Bezos Expeditions since 2025, the company serves frontier model laboratories and enterprises building their own systems.
toloka.ai • HQ: Amsterdam, Netherlands • Machine Learning • Data & Analytics • Data Collection • LLM & Generative AI • Artificial Intelligence • 51-200 employees • Est. 2014
HQ: Amsterdam, Netherlands • Machine Learning • Data & Analytics • Data Collection • LLM & Generative AI • Artificial Intelligence • 51-200 employees • Est. 2014
Verified live · 2 hours ago 1 month ago

Freelance Forward Deployed AI Engineer

Remote (EU, United States, United Kingdom, Serbia) • Master's Degree • Freelance
Python
AI/ML
LLM
LoRA
NumPy
Pandas
PEFT
RAG
RLHF
Synthetic Data
Transformers
Anthropic
DPO
PPO
SFT
AI Agents
Fine-tuning
Apply
Report

Cohere

cohere.com
Cohere is a Canadian AI company founded in 2019 and headquartered in Toronto. It builds secure, enterprise-focused large language models and AI tools for businesses and regulated industries. The company is known for emphasizing privacy, private deployment, and "sovereign AI" rather than consumer chat products
cohere.com • HQ: Toronto, Canada • Energy & Utilities • Biotechnology • Natural Language Processing • LLM & Generative AI • Artificial Intelligence • 1001-5000 employees • Est. 2019
HQ: Toronto, Canada • Energy & Utilities • Biotechnology • Natural Language Processing • LLM & Generative AI • Artificial Intelligence • 1001-5000 employees • Est. 2019
Verified live · 12 hours ago 19 days ago

Member of Technical Staff, Agentic Environments

$126k – $277k per year (Estimated) • Staff+ • New York • Remote (EU, Europe, United States, Canada) • Full-Time • Staff
Python
AI/ML
Cohere SDK
JAX
LLM
Multimodal AI
PyTorch
Ray
AI Agents
DevOps
Kubernetes
Apply
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Experian

experian.com
Experian is a global information services and data analytics company best known as one of the "Big Three" credit reporting agencies (alongside Equifax and TransUnion). Headquartered in Dublin, Ireland, with operational centers in the US, UK, and Brazil, the firm collects and manages credit and financial data on hundreds of millions of consumers and businesses worldwide.
experian.com • HQ: Dublin, Ireland • Cybersecurity • Fraud Detection • Financial Services • Data & Analytics • 5000+ employees
HQ: Dublin, Ireland • Cybersecurity • Fraud Detection • Financial Services • Data & Analytics • 5000+ employees
Verified live · 2 hours ago 21 day ago

Machine Learning Engineer

Middle • 4+ years expRemote/Hybrid (Sofia, Bulgaria) • Full-Time • Middle
Python
Python
pySpark
AI/ML
Anomaly Detection
Fine-tuning
LLM
Prompt Engineering
RAG
Reinforcement Learning
Spark
DevOps
AWS
Apply
Verified live · 2 hours ago 1 month ago

GenAI Product Lead, EMAP

Lead • 12+ years expIn office (Sofia, Bulgaria) • Full-Time • Senior
LLM Guardrails
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Constructor

constructor.io
Founded in 2015, Constructor is an AI-powered search and product discovery platform built specifically for enterprise e-commerce businesses. The company utilizes real-time clickstream data and machine learning to deliver personalized product recommendations, site search results, and category browse experiences. By optimizing search outcomes for key retail metrics like revenue and conversion rather than simple keyword matching, it helps major online retailers increase sales and improve customer retention.
constructor.io • HQ: San Francisco, United States • Internet Services • Artificial Intelligence • Commerce • Search Engines • Est. 2015
HQ: San Francisco, United States • Internet Services • Artificial Intelligence • Commerce • Search Engines • Est. 2015
Verified live · 1 day ago 25 days ago

Senior Backend Engineer: Machine Learning Infrastructure

$80k – $120k per year • Senior • 5+ years exp • Remote (EMEA) • Full-Time • Senior
Python
C++
Go
Rust
Databases
PostgreSQL
Milvus
OpenSearch
pgvector
Qdrant
Weaviate
DevOps
AWS
Azure
GCP
Kubernetes
Platform Engineering
Terraform
Vector
Apply
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Canonical

canonical.com
Canonical is the publisher of Ubuntu, the world's most widely used Linux distribution, headquartered in London. Founded in 2004 by Mark Shuttleworth, the company provides enterprise-grade services, support, and security for open-source software, enabling organizations to deploy and manage workloads consistently across diverse environments. Their portfolio spans the entire compute spectrum - from public and private cloud infrastructure (OpenStack), container orchestration (Kubernetes/MicroK8s), and data center management to specialized edge and IoT computing.
canonical.com • HQ: London, United Kingdom • Artificial Intelligence • Software • Information Technology • 1001-5000 employees • Est. 2004
HQ: London, United Kingdom • Artificial Intelligence • Software • Information Technology • 1001-5000 employees • Est. 2004
Open 1262 daysVerified live · 10 hours ago 3 years ago

Engineering Manager - MLOps & Analytics

Lead • Remote (AMER, EMEA) • Staff
Python
AI/ML
Feast
Kubeflow
MLFlow
DevOps
AWS
Azure
Docker
GCP
Kubernetes
Ubuntu
Apply
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Machine Learning Engineer Jobs in Sofia
Frequently asked questions
How many Machine Learning Engineer jobs in Sofia are available on Alion?
There are currently 12 active listings from 11 hiring companies on Alion, refreshed daily.
Which companies are hiring for Machine Learning Engineer jobs in Sofia?
11 vetted startups and product companies are currently hiring on Alion.
Are remote options available for Machine Learning Engineer jobs in Sofia?
Yes, many of these roles offer remote or hybrid work, and you can filter listings by remote, relocation and visa sponsorship.
How do I apply for Machine Learning Engineer jobs in Sofia?
Open any listing on Alion and apply directly with the employer through the provided link - no lengthy sign-up required.