Backend Developer Jobs in Sofia

Backend Developer jobs in Sofia hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $55,000/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.

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Quantum

Wayflyer

wayflyer.com
Providing eCommerce businesses with fairer, faster, and more flexible funding. Our mission at Wayflyer is to support the ambition of the eCommerce businesses we work with. We do this by solving the toughest problems in eCommerce, giving founders ...
wayflyer.com • New York • Dublin • Charlotte • London • Berlin • Commerce • Est. 2019
New York • Dublin • Charlotte • London • Berlin • Commerce • Est. 2019
Verified live · 6 hours ago 2 months ago

Full Stack Software Engineer

$66k – $187k per year (Estimated) • Senior • 5+ years exp • Remote (Europe) • Bachelor's Degree • Full-Time • Senior
Python
SQL
TypeScript
JavaScript
Python
Django
FastAPI
Flask
Databases
PostgreSQL
Frontend
React.js
Storybook
DevOps
AWS
CI/CD
Git
GitHub Actions
GitHub
QA
Playwright
Pytest
Vitest
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Open 187 daysVerified live · 6 hours ago 7 months ago

Backend Software Engineer

$66k – $188k per year (Estimated) • Senior • 5+ years exp • Remote (Europe) • Bachelor's Degree • Full-Time • Senior
Python
SQL
Python
Django
FastAPI
Flask
Databases
PostgreSQL
DevOps
AWS
Git
QA
Pytest
Apply
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Brave

brave.com
Brave Software is an internet browser that is focused in on being privacy-oriented and is combined with its blockchain-based digital advertising platform. The company is based out of San Francisco, California.
brave.com • London • Search Engines • Artificial Intelligence • 501-1000 employees
London • Search Engines • Artificial Intelligence • 501-1000 employees
Top 25% payVerified live · 12 hours ago 2 months ago

Sr. Solutions Engineer - API and Developer Platform

$150k – $200k per year • Senior • Remote (Europe, United States) • Full-Time • Senior
JavaScript
Python
Databases
Supabase
AI/ML
LangChain
LlamaIndex
LLM
RAG
Semantic Search
AI Agents
Semantic Search
DevOps
Vercel
GitHub
QA
Postman
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Netguru

netguru.com
Netguru is a digital consultancy and software development company headquartered in Poznan, Poland, and founded in 2008. The firm provides a wide range of services including custom software engineering, product design, artificial intelligence development, and cloud infrastructure management. Operating globally with a team of over 600 specialists, the company serves clients across various sectors such as finance, healthcare, and retail, focusing on digital transformation and AI-native commerce solutions.
netguru.com • HQ: Poznań, Poland • Machine Learning • Artificial Intelligence • Web Development • IT Outsourcing • Information Technology • Design & Creative • Mobile App Development • Software • Est. 2008
HQ: Poznań, Poland • Machine Learning • Artificial Intelligence • Web Development • IT Outsourcing • Information Technology • Design & Creative • Mobile App Development • Software • Est. 2008
$61k – $94k per year (Estimated) • Senior • Poznań • Remote (EU) • Freelance • Senior • Polish: C1
C#
SQL
TypeScript
C#
ASP.NET Core
Databases
PostgreSQL
AI/ML
Claude
Gemini
LangChain
Semantic Kernel
OpenAI
Mobile
Clean Architecture
DevOps
CI/CD
Docker
GCP
Git
Apply
$68k per year • Senior • Poznań • Remote (EU) • Freelance • Senior
Java
Kotlin
Scala
Swift
Swift
Hero
Databases
MySQL
PostgreSQL
DevOps
AWS
Azure
CI/CD
GCP
Analytics
ETL/ELT
Apply
Verified live · 1 day ago 9 months ago

Backend Kotlin Engineer - Freelance

$38k per year • Remote (EU) • Freelance
Kotlin
Databases
Apache Kafka
DevOps
CI/CD
Kubernetes
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Webdoctor

webdoctor.ie
Webdoctor is a healthcare provider in the telemedicine and digital health services field in Ireland. It provides online doctor consultations, electronic prescriptions, and remote medical advice and referrals.
webdoctor.ie • Warsaw • Dublin • Health Care • Hospitals & Clinics • Digital Health
Warsaw • Dublin • Health Care • Hospitals & Clinics • Digital Health
$62k – $95k per year (Estimated) • Senior • 5+ years expWarsaw • Remote (EU, EEA) • Full-Time • Senior
JavaScript
Ruby
SQL
Ruby
Hotwire
Ruby on Rails
Stimulus
Frontend
React.js
DevOps
Ansible
Azure
Azure DevOps
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Sourcegraph

sourcegraph.com
Founded in 2013, Sourcegraph is an AI-powered code intelligence platform designed to help software engineers search, understand, and automate edits across massive codebases. The platform offers universal code search and an AI coding assistant named Cody, enabling developers to navigate complex repositories, speed up context gathering, and fix issues faster. By integrating directly into existing developer workflows and hosting environments, the company helps large engineering teams scale productivity and maintain code quality.
sourcegraph.com • Media & Entertainment • Books • Artificial Intelligence • Code Intelligence • Est. 2013
Media & Entertainment • Books • Artificial Intelligence • Code Intelligence • Est. 2013
Verified live · 1 hour ago 2 months ago

Software Engineer/Tech Lead - Code Plane [IC5]

$114k – $256k per year (Estimated) • Lead • 8+ years exp • Remote • Internship • Staff
JavaScript
Go
TypeScript
Databases
PostgreSQL
AI/ML
AI Agents
Claude
Claude Code
Cursor
Model Context Protocol
Frontend
Svelte
GraphQL
SvelteKit
DevOps
Docker
Kubernetes
QA
Rest-Assured
Apply
Verified live · 1 hour ago 2 months ago

Software Engineer - Platform [IC3]

Remote
Model Context Protocol
DevOps
AWS
Azure
CDKTF
GCP
Kubernetes
SLI/SLO/SLA
Terraform
gRPC
QA
Rest-Assured
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DeepInfra

deepinfra.com
DeepInfra is a company founded in 2022 that runs a low-cost inference cloud for open machine learning models. Developers call hosted language, embedding, speech and image models through a simple interface and pay per token or per second without managing graphics hardware. Its focus on cheap serving of open-weight models made it popular with startups building on Llama, Mistral and Qwen.
deepinfra.com • HQ: Palo Alto, United States • E-learning • Machine Learning • Artificial Intelligence • Est. 2022
HQ: Palo Alto, United States • E-learning • Machine Learning • Artificial Intelligence • Est. 2022
Open 329 daysVerified live · 8 hours ago 11 months ago

Software Engineer Intern (Europe)

Intern • Remote (Bulgaria) • Bachelor's Degree • Internship • Intern
C++
Python
C++
PyTorch C++
TensorFlow C++
AI/ML
CUDA
CUDA Toolkit
Diffusers
Multimodal AI
NumPy
PyTorch
SciPy
TensorFlow
Transformers
Edge AI
NCCL
OpenAI
DevOps
Git
Apply
Open 215 daysVerified live · 8 hours ago 8 months ago

Software Engineer - Europe, Early Career

Junior • Remote (Bulgaria) • Bachelor's Degree • Full-Time • Junior
C++
Python
C++
PyTorch C++
TensorFlow C++
AI/ML
CUDA
CUDA Toolkit
Diffusers
Multimodal AI
NumPy
PyTorch
SciPy
TensorFlow
Transformers
Edge AI
NCCL
DevOps
Git
Apply
Open 153 daysVerified live · 8 hours ago 6 months ago

Software Engineer - Europe

Middle • 3+ years exp • Remote (Bulgaria) • Bachelor's Degree • Full-Time • Middle
C++
Python
C++
PyTorch C++
TensorFlow C++
AI/ML
CUDA
CUDA Toolkit
Diffusers
Multimodal AI
PyTorch
TensorFlow
Transformers
Edge AI
NCCL
DevOps
Git
Apply
Report

Clarity

clarity.ai
Your browser does not support the video tag. Clarity, with proof The AI-native platform for extra-financial intelligence We support financial institutions, companies, governments, and consumers in making the right decisions - efficiently, confidently, and at scale.
clarity.ai • Madrid • Data & Analytics • Financial Services • Artificial Intelligence • Est. 2017
Madrid • Data & Analytics • Financial Services • Artificial Intelligence • Est. 2017
Open 131 day 5 months ago

Junior Software Engineer - Consumer Team

$65k – $170k per year (Estimated) • Equity • Junior • Remote (Europe) • Master's Degree • Internship • Junior
Java
Kotlin
TypeScript
JavaScript
Java
Spring Boot
Gradle
Databases
PostgreSQL
Frontend
React.js
DevOps
Docker
GitHub Actions
GitLab CI
gRPC
Kubernetes
GitHub
GitLab
Apply
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Defuse Labs

defuse.org
Defuse Labs develops NEAR Intents to enable seamless cross-chain interactions in an automated world — connecting AI, services, and financial applications.
defuse.org • Artificial Intelligence • Web3 & dApps • Blockchain & Crypto
Artificial Intelligence • Web3 & dApps • Blockchain & Crypto
Open 131 dayVerified live · 1 day ago 5 months ago

Senior Software Engineer

$94k – $229k per year (Estimated) • Senior • Remote • Senior
Node JS
Rust
TypeScript
JavaScript
DevOps
GCP
Grafana
Kubernetes
Prometheus
Web3
NEAR
Smart Contracts
Apply
Open 154 daysVerified live · 1 day ago 6 months ago

Senior Software Engineer (Solvers)

$92k – $223k per year (Estimated) • Senior • 7+ years exp • Remote • Senior
JavaScript
TypeScript
C++
Rust
Web3
NEAR
Smart Contracts
MEV
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Scalera AG

ra-scale.ai
RA Scale AG is an ETH Zurich spin off based in the Zurich region that operates the ra-scale.ai platform under the Scalera brand. The company develops an artificial intelligence software suite for construction tenders to help mid sized construction companies optimize business processes and improve return on investment.
ra-scale.ai • Zurich • Artificial Intelligence • Real Estate • PropTech
Zurich • Artificial Intelligence • Real Estate • PropTech
$74k – $105k per year • Senior • 4+ years expZurich • Remote (EU, EEA) • Full-Time • Senior
Python
Python
Django
FastAPI
DevOps
CI/CD
Apply
Open 139 days 5 months ago

Senior Backend Engineer (Python) (Remote)

$99k – $185k per year (Estimated) • Senior • 4+ years expZurich • Remote (EU, EEA) • Full-Time • Senior
Python
Python
Django
FastAPI
Databases
Google BigQuery
AI/ML
Claude
Copilot
Cursor
DevOps
CI/CD
GCP
Google Cloud Run
Apply
Report

Zapier

zapier.com
Build and scale AI workflows and agents across 9,000+ apps with Zapier—the most connected AI orchestration platform. Trusted by 3 million+ businesses.
zapier.com • Artificial Intelligence • Data Integration • Business Process Automation (BPA) • Est. 2011
Artificial Intelligence • Data Integration • Business Process Automation (BPA) • Est. 2011
Verified live · 1 hour ago 3 months ago

Staff Backend Engineer, Commerce

Staff+ • 8+ years exp • Remote (AMER, EMEA, APAC) • Full-Time • Staff
ChatGPT
Claude
Management
Zapier
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Builder.io

builder.io
One codebase for engineers, designers, PMs, and marketers. Everyone works from one source of truth, on brand and in code, with no handoffs to clean up.
builder.io • New York • San Francisco • Software • Digital Design • Web Development • 51-200 employees • Est. 2017
New York • San Francisco • Software • Digital Design • Web Development • 51-200 employees • Est. 2017
Verified live · 1 day ago 3 months ago

Senior Customer Engineer

$140k – $186k per year • Equity • Senior • 6+ years exp • Remote (EMEA) • Senior
JavaScript
TypeScript
AI/ML
AI Agents
LLM
Frontend
Angular
GraphQL
React.js
Vue.js
Apply
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Uberall

uberall.com
Uberall is a Berlin company founded in 2013 that manages location data and reviews for multi-site brands. Its platform keeps store information consistent across maps, search engines and directories and handles customer reviews centrally. The company serves retail, hospitality and service chains across Europe and North America.
uberall.com • HQ: Berlin, Germany • Sales & Marketing • Data & Analytics • Artificial Intelligence • Est. 2013
HQ: Berlin, Germany • Sales & Marketing • Data & Analytics • Artificial Intelligence • Est. 2013
Verified live · 1 day ago 3 months ago

Senior Software Engineer - AI Platform & Frameworks

$68k – $191k per year (Estimated) • Senior • 7+ years exp • Remote (Europe, Armenia) • Contractor • Senior
Kotlin
Python
Java
Java
Spring Boot
Databases
Redis
AI/ML
AI Agents
LangChain
LangGraph
LLM
Function Calling
Human-in-the-Loop
LLM Guardrails
Model Context Protocol
Langfuse
MLFlow
DevOps
AWS
gRPC
Apply
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LucidLink

lucidlink.com
LucidLink is a cloud file streaming and data management technology enterprise headquartered in San Francisco, California, with major R&D operations in Sofia, Bulgaria. Founded in 2016 by Peter Thompson and George Dochev, the venture-backed firm has raised over $90 million from investors including Bright Pixel Capital, Headline, and Baseline Ventures.
lucidlink.com • HQ: San Francisco, United States • Information Technology • Cloud Computing • Internet Services • Cloud Storage & File Sharing • Est. 2016
HQ: San Francisco, United States • Information Technology • Cloud Computing • Internet Services • Cloud Storage & File Sharing • Est. 2016
Verified live · 1 day ago 3 months ago

Software Engineer, C++

Equity • Middle • 3+ years expIn office (Sofia, Bulgaria) • Full-Time • Middle
C++
TypeScript
DevOps
CI/CD
Apply
Verified live · 1 day ago 3 months ago

Senior Software Engineer, Backend

Equity • Senior • 5+ years expIn office (Sofia, Bulgaria) • Full-Time • Senior
JavaScript
Node JS
TypeScript
Frontend
React.js
DevOps
AWS
Azure
CI/CD
GCP
Apply
Report

Chromatic

chromatic.com
Chromatic catches visual, interaction, and accessibility issues before they ship. This enforces your UI standards, even when AI codes. Assign reviewers to speed up sign-off and provide agents with validated UI context.
chromatic.com • Software • Quality Assurance • Est. 2017
Software • Quality Assurance • Est. 2017
Verified live · 1 day ago 3 months ago

Developer Experience Engineer

$175k – $194k per year • Remote (Europe, North America) • Full-Time
JavaScript
AI/ML
AI Agents
Apply
Report

Bitso

bitso.com
Bitso is a Latin American digital asset platform founded in 2014 and headquartered in Mexico City. It serves retail customers in Mexico, Argentina, Brazil and Colombia and provides stablecoin-based settlement rails for cross-border remittance corridors. The company holds a fintech licence in Mexico and processes a substantial share of the country's digital asset remittance flow.
bitso.com • HQ: Mexico City, Mexico • Cryptocurrencies • Blockchain & Crypto • Est. 2014
HQ: Mexico City, Mexico • Cryptocurrencies • Blockchain & Crypto • Est. 2014
Equity • Remote (LATAM, Europe)
Java
Databases
Apache Kafka
PostgreSQL
AI/ML
Claude
Cursor
DevOps
AWS
CI/CD
Docker
GCP
Kubernetes
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 · 1 hour ago 3 months ago

Software Engineer, North for Finance

Remote (EU, Europe, United States, Canada) • Full-Time
AI Agents
Edge AI
Apply
Report

Welltech

welltech.com
Welltech is about creating mobile applications that improve the Health of Millions of People around the World! The main distinguishing feature of our People is their desire to constantly grow, develop and learn new things. We currently have 500+ p...
welltech.com • Information Technology • 201-500 employees
Information Technology • 201-500 employees
Verified live · 11 hours ago 3 months ago

Senior Fullstack Engineer, Cross-platform

Senior • Remote (Bulgaria, Hungary, Romania, Armenia, Estonia) • Full-Time • Senior
TypeScript
JavaScript
Node JS
AI/ML
AI Agents
Frontend
React.js
Mobile
React Native
Exoplayer
DevOps
CI/CD
Trunk-Based Development
Analytics
A/B Testing
Apply
Report

Huzzle

huzzle.app
Huzzle is an early careers platform connecting students, societies, and employers. Starting out as a CRM for pre-professional student societies, Huzzle has evolved into the university career companion used by over 100,000 talents in the UK.
huzzle.app • HQ: London, United Kingdom • Professional Services • Education • Human Resources • 1001-5000 employees
HQ: London, United Kingdom • Professional Services • Education • Human Resources • 1001-5000 employees
Verified live · 3 hours ago 3 months ago

Full Stack Developer (Angular & Nest.js)

$52k – $94k per year (Estimated) • Remote (Bulgaria, Croatia, Poland, Serbia) • Full-Time
JavaScript
Node JS
TypeScript
Node JS
Nest.JS
Databases
MySQL
PostgreSQL
Frontend
Angular
DevOps
CI/CD
Git
Rest API
AWS
Azure
Docker
GCP
Apply
Report

Playson

playson.com
Playson is a renowned digital entertainment supplier, founded in 2012, which has developed worldwide recognition in the iGaming industry. We operating across 27 regulated markets and partnering with more than 200 operators worldwide. The company offers a diverse portfolio of online casino games, combining engaging math models with high-quality design and immersive gameplay experiences.
playson.com • HQ: Warsaw, Poland • Game Development • Gaming • iGaming & Gambling
HQ: Warsaw, Poland • Game Development • Gaming • iGaming & Gambling
Verified live · 1 day ago 3 months ago

Senior Software Engineer (Game Engine)

Senior • Remote (EU) • Full-Time • Senior • English: B2 • Ukrainian (Optional)
C#
C++
Go
Java
Node JS
Python
TypeScript
JavaScript
Databases
Apache Kafka
ClickHouse
DevOps
AWS
gRPC
Kubernetes
Apply
Open 434 daysVerified live · 1 day ago 1 year ago

Senior Backend Engineer (Boosters)

Senior • Remote (EU) • Bachelor's Degree • Full-Time • Senior
C#
C++
Go
Java
Node JS
TypeScript
JavaScript
Databases
Apache Kafka
ClickHouse
DynamoDB
MySQL
NATS
PostgreSQL
RabbitMQ
DevOps
AWS
Azure
GCP
gRPC
Kubernetes
Chips/EDA
PoC Library
Apply
Open 501 dayVerified live · 1 day ago 1 year ago

Senior Backend Engineer (Core Team)

Senior • Remote (EU, Ukraine) • Full-Time • Senior
C#
C++
Go
Java
Node JS
Python
TypeScript
JavaScript
Databases
Apache Kafka
DynamoDB
MySQL
PostgreSQL
Redis
ClickHouse
AI/ML
Claude
Claude Code
Cursor
DevOps
AWS
gRPC
Kubernetes
GCP
Apply
Report

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 3 months ago

Senior Backend Engineer: Recommendations

$80k – $120k per year • Senior • Remote (EMEA) • Full-Time • Senior • English: B2
Python
Rust
DevOps
AWS
Azure
CI/CD
CloudFormation
GCP
GitHub Actions
Grafana
Jenkins
PagerDuty
Prometheus
Terraform
Amazon CloudWatch
GitHub
Analytics
A/B Testing
Apply
Verified live · 1 day ago 3 months ago

Backend Engineer: Ranking

$80k – $120k per year • Remote (EMEA) • Full-Time • English: B2
Python
Rust
AI/ML
Feature Store
DevOps
CloudFormation
Terraform
AWS
Azure
CI/CD
GCP
Apply
Verified live · 1 day ago 4 months ago

Senior Backend Engineer: Attribute Enrichment

$80k – $120k per year • Senior • 5+ years exp • Remote (EMEA) • Full-Time • Senior • English: B2
Python
Go
Rust
DevOps
AWS
CI/CD
GitHub Actions
Grafana
Jenkins
PagerDuty
Prometheus
Amazon CloudWatch
GitHub
QA
Pytest
Apply
Report
Backend Developer Jobs in Sofia
Frequently asked questions
How many Backend Developer jobs in Sofia are available on Alion?
There are currently 43 active listings from 23 hiring companies on Alion, refreshed daily.
What salary do Backend Developer jobs in Sofia pay?
The average salary is around $55,000 per year based on the current listings.
Are remote options available for Backend Developer 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 Backend Developer jobs in Sofia?
Open any listing on Alion and apply directly with the employer through the provided link - no lengthy sign-up required.