Senior Software Developer/Engineer

15 Jan 2026
Job Information

Organisation/Company

K3Y Ltd

Department

R&D

Research Field

Computer science » Computer systems
Engineering » Computer engineering

Researcher Profile

Established Researcher (R3)
Leading Researcher (R4)

Positions

Master Positions

Application Deadline

30 Jan 2026 - 00:00 (Europe/Sofia)

Country

Bulgaria

Type of Contract

Temporary

Job Status

Full-time

Hours Per Week

40

Offer Starting Date

15 Jan 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 Senior Software Developer/Engineer to join and work with 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 Senior Software Developer/Engineer in our R&D Department in Sofia, Bulgaria or in our Business Development & Innovation Department in Thessaloniki, Greece, your core duties will encompass the creation, implementation, and ongoing support of robust software applications built mostly with Angular and Django frameworks. Working alongside diverse teams, you will help establish technical specifications, deliver scalable and performant code, and guarantee application stability and efficiency. Your role demands autonomous operation with excellent judgment capabilities and the ability to recommend sound technical approaches. Beyond individual contributions, you will guide less experienced team members, take part in system architecture planning, perform code assessments, and high-quality, superior development and quality assurance standards across all project initiatives. Your involvement will extend to nationally and EU-supported programmes, where you will oversee both technical and non-technical deliverables and project components.

Responsibilities

• Work in partnership with product managers and relevant stakeholders to collect requirements, convert them into technical specifications, and provide solutions that fulfill organizational objectives.
• Perform code assessments, offer constructive guidance, and coach junior developers to promote team development and uphold code quality standards.
• Create, implement, and support dependable web applications utilising Angular for frontend development and Django for backend architecture, guaranteeing optimal performance and scalability.
• Enhance applications for velocity, scalability, and dependability, encompassing troubleshooting and resolving technical challenges throughout the entire technology stack.
• Produce clear, sustainable, and thoroughly documented code combined with architectural planning while following established coding standards and industry best practices.
• Engage in nationally and EU-supported projects through coordination and collaboration with the Research & Development (R&D) team.

Required Qualifications & Experience

• Master’s degree or Doctor of Philosophy (PhD) in computer science, engineering, or related technical field.
• Minimum 2 years of experience in EU-funded R&D projects.
• Excellent communication and presentation skills in English language.
• Fundamental knowledge of Linux and experience with Docker for containerization.
• 4+ years of professional experience in software development.
• Ability to understand, design solutions, contribute to and discuss on ICT and engineering problems.
• Self-driven, detail-oriented, and adaptable to shifting priorities and deadlines.
• Capacity to operate autonomously and recommend viable engineering solutions.

Preferred Qualifications & Experience

• PhD degree in computer science, engineering, or a related technical field.
• Experience in R&D-intensive environments (e.g., deep tech, software, manufacturing).
• Excellent background on Angular, Python, Django and Celery.
• Familiarity with DevOps practices, such as CI/CD pipelines, containerization, or cloud platforms.

Where to apply

E-mail

info@k3ylabs.com

Requirements

Research Field

Computer science » Computer systems

Education Level

Master Degree or equivalent

Research Field

Engineering » Computer engineering

Education Level

Master Degree or equivalent

Languages

ENGLISH

Level

Excellent

Research Field

Computer science » Computer systemsEngineering » Communication engineering

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 environment.
• Diversity of challenges, experience and working teams.
• Opportunity of 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.
• Only 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
There is no fixed application deadline, but we are looking to fill this position at the earliest.

 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 Senior Software Developer/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

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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