AI Research Engineer

1 Apr 2026
Job Information

Organisation/Company

K3Y Ltd

Department

R&D

Research Field

Computer science » Computer systems
Engineering » Computer engineering
Technology » Computer technology

Researcher Profile

First Stage Researcher (R1)
Recognised Researcher (R2)
Established Researcher (R3)

Positions

Bachelor Positions

Application Deadline

15 Apr 2026 - 00:00 (Europe/Sofia)

Country

Bulgaria

Type of Contract

Temporary

Job Status

Full-time

Hours Per Week

40

Offer Starting Date

2 Apr 2026

Is the job funded through the EU Research Framework Programme?

Horizon Europe

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

We are looking for a full-time AI Research Engineer to join K3Y Ltd, a fast-growing SME with presence in Bulgaria and Greece. K3Y Ltd is one of the most dynamic and vibrant technology companies in Bulgaria, Greece and Europe, dealing with deep tech topics like cybersecurity, data privacy, artificial intelligence, 6th generation of cellular networks and next generation Internet of Things. K3Y Ltd invests in innovative and sustainable software solutions and tools, while delivering professional services and consulting worldwide. Participating in more than 24+ illustrious EU-funded projects (H2020, Horizon Europe, Erasmus+ and more), K3Y Ltd is to emerge as a leading technology and service provider by materialising innovation into business and market solutions in the Balkans, Eastern Europe, across Europe and worldwide.

As a full-time AI Research Engineer in our R&D Department in Sofia, Bulgaria or in our Business Development & Innovation Department in Thessaloniki, Greece, you will design, develop, and deploy advanced AI/ML solutions within the EU-funded projects K3Y participates in. You will ensure the timely delivery of high-quality AI models, prototypes, and technical outputs, while collaborating closely with R&D personnel and external project partners. You will conduct applied research and implementation activities, contributing original ideas, methodologies, architectures, and results across various domains. You will also actively explore emerging and innovative directions in AI research, pushing the boundaries of current solutions adopted in the projects. Finally, you will represent the company in consortium meetings, workshops, and EU project reviews, while participating in internal and plenary meetings, demonstration meetings, workshops and conferences, where appropriate.

 

Responsibilities

• Design, develop, and deploy end-to-end AI/ML solutions aligned with project requirements and research objectives.
• Process complex datasets, build analytics pipelines, and apply advanced statistical and ML modelling techniques.
• Engineer, train, fine-tune, and optimize ML/DL models with a focus on explainability and performance.
• Apply MLOps and software engineering best practices (CI/CD, testing, scalable deployments).
• Actively explore and experiment with emerging and innovative AI research directions, contributing novel ideas to ongoing and future projects.
• Author technical and research documentation.
• Lead and coordinate project planning, milestone tracking, and cross-team communication.
• Represent the company at project meetings, conferences, and partner events.

 

Basic Qualifications

• BSc or/and MSc in Computer Science, Engineering, ICT or related fields.
• Advanced Python programming coding skills; experience with testing frameworks (e.g. Pytest).
• Advanced and deep understanding of machine learning, artificial intelligence, algorithms, and knowledge of the latest developments in AI.
• Proficiency in ML tracking/monitoring tools (MLflow, Grafana) and LLM frameworks (LangChain, LangGraph, Hugging Face).
• Solid knowledge of version control (GitHub/GitLab), CI/CD, Docker, FastAPI, and Kubernetes/Kubeflow for serving ML solutions at scale.
• Experience training models on GPU infrastructure (SSH access) and distributed computing environments.
• Strong problem-solving, documentation, and communication skills across technical and non-technical contexts.
• Ability to adjust across different tasks and domains.

 

Preferred Qualifications

• Doctor of Philosophy (PhD) in scientific or engineering field, preferably in computer science, electrical engineering or ICT.
• Experience in working with EU-funded projects.
• Experience with databases, SQL and NoSQL.
• Knowledge of full-stack development for web services.
• Expertise in data protection techniques including encryption, anonymization, and compliance with regulatory standards (GDPR).

Where to apply

E-mail

info@k3ylabs.com

Requirements

Research Field

Computer science » Computer systems

Education Level

Bachelor Degree or equivalent

Research Field

Engineering » Computer engineering

Education Level

Bachelor Degree or equivalent

Research Field

Technology » Computer technology

Education Level

Bachelor Degree or equivalent

Languages

ENGLISH

Level

Excellent

Research Field

Computer science » Computer systemsEngineering » Computer engineeringTechnology » Computer technology

Years of Research Experience

1 - 4

Additional Information
Benefits

• Friendly, motivated, and inclusive team with a strong European and International network.
• Competitive remuneration package based on qualifications and experience.
• Exposure to multinational and multicultural environments.
• Diversity of challenges, experience and working teams.
• Opportunity to enrich your skills and experience by working with experienced and talented professionals.
• Flexible working hours.
• Career progression opportunities.

Selection process

• Interested applications will be invited for a remote or on-site interview.
• Ony short-listed applications will be invited to the selections process.
• For more information about the Job Offer, you can contact: info@k3ylabs.com

Additional comments

Equal Opportunities

K3Y Ltd is proud to be an equal opportunity workplace. We are committed to equal employment opportunity without unlawful regard to race, colour, ancestry, religion, gender, national origin, sexual orientation, age, citizenship, marital status, disability, veteran status, or other local legally protected characteristics.

Preferred Starting Date

No fixed starting date. We are looking forward to filling the job position as soon as possible.

How to apply

To apply, K3Y Ltd invites applicants to send a detailed CV to the following email address: info@k3ylabs.com  with the title "Application for the position of the AI Research Engineer" in the subject.

Website for additional job details

https://k3ylabs.com/career/

Work Location(s)

Number of offers available

1

Company/Institute

K3Y Ltd

Country

Bulgaria

City

Sofia

Postal Code

1700

Street

Studentski District, Vitosha Quarter, Bl. 9

Number of offers available

1

Company/Institute

K3Y Ltd

Country

Greece

City

Thessaloniki

Postal Code

55134

Street

Ioustinianou 5 & Solomou

Geofield

Contact

City

Sofia

Website

https://k3ylabs.com/

Street

Studentski District, Vitosha Quarter, Bl. 9

Postal Code

1700

E-Mail

info@k3ylabs.com

Phone

+359 87 7887132

STATUS: EXPIRED

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