Blockchain Capital is one of the earliest dedicated digital asset venture firms, founded in 2013 in San Francisco. It has invested across many funds in exchanges, infrastructure, decentralised finance and consumer applications. The firm was also a pioneer of tokenised fund structures, issuing a security token to represent limited partner interests.
HQ: San Francisco, United States • Blockchain & Crypto • Est. 2013
≈ $33k – $42k per year (Estimated) • Senior • 7+ years exp • Remote (United Kingdom, Argentina, Brazil, Bulgaria, Canada) • Full-Time • Senior
Rust
Databases
Apache Kafka
≈ $40k – $113k per year (Estimated) • Senior • 5+ years exp • Remote (Argentina, Brazil, Bulgaria, Colombia, Czech Republic) • Full-Time • Senior
Python
Ruby
Rust
TypeScript
JavaScript
Databases
MariaDB
MySQL
Redis
Frontend
React.js
Mobile
React Native
DevOps
CI/CD
Docker
GitLab CI
Kubernetes
Terraform
GitLab
Analytics
A/B Testing
≈ $45k – $91k per year (Estimated) • Middle • 3+ years exp • Remote (Argentina, Brazil, Bulgaria, Colombia, Cyprus) • Full-Time • Middle
Rust
Databases
Apache Kafka
Kalepa delivers critical risk insights and decision-ready quotes for every submission in minutes. Move faster, act decisively, and consistently select the most profitable risks - across every line you write.
Warsaw • New York • Salt Lake City • Artificial Intelligence • Financial Services • Insurance • Est. 2018
$100k – $185k per year • Equity • Staff+ • 8+ years exp • Remote (Europe) • Staff
Python
Databases
PostgreSQL
AI/ML
LLM
DevOps
Amazon EC2
AWS
AWS Lambda
$100k – $185k per year • Equity • Staff+ • 8+ years exp • Remote (Europe) • Staff
Python
Databases
PostgreSQL
DevOps
Amazon EC2
AWS Lambda
AWS
$80k – $165k per year • Equity • Senior • 5+ years exp • Remote (Europe) • Senior
Python
Databases
PostgreSQL
DevOps
Amazon EC2
AWS Lambda
AWS
Zencargo is a London company founded in 2017 that combines digital freight forwarding with supply chain software. Its platform gives importers visibility of shipments and recommends how to route and fund inventory. The company works with consumer brands and retailers moving goods from Asia into Europe.
HQ: London, United Kingdom • Freight Forwarding • Supply Chain • Transportation & Logistics • 51-200 employees • Est. 2017
Remote (Europe) • Full-Time
Wingtra is a Swiss drone company founded in 2016 as a spin-off of ETH Zurich. Its WingtraOne vertical take-off aircraft maps large areas at survey-grade accuracy for mining, construction and agriculture. The company sells through a global distribution network across dozens of countries.
HQ: Zurich, Switzerland • Electronic Components • Drones & UAVs • Hardware • Est. 2016
≈ $107k – $169k per year (Estimated) • Remote (Europe) • Bachelor's Degree • Full-Time
TypeScript
JavaScript
Databases
PostgreSQL
Frontend
Next.js
React.js
DevOps
CI/CD
Marketing
HubSpot
Mindrift is an expert-sourcing and AI training platform owned by Toloka (a data services enterprise owned by Nebius Group, Nasdaq: NBIS), operating primarily out of Amsterdam, Netherlands. Launched by Toloka CEO and founder Olga Megorskaya to elevate crowd-sourced data generation into high-level human feedback, Mindrift operates on a B2B data-as-a-service (DaaS), custom enterprise AI training contract, and freelance expert marketplace model.
HQ: Amsterdam, Netherlands • Professional Services • Data Entry & Processing • Cybersecurity • 1001-5000 employees • Est. 2014
up to $80k per year • Senior • 5+ years exp • Remote (Bulgaria, Czech Republic, Hungary, Poland, Romania) • Freelance • Senior • English: C1
JavaScript
Python
Python
Beautiful Soup
AI/ML
OpenRouter
LangChain
LLM
DevOps
AWS
Docker
GitHub
QA
Selenium
Gradle by Develocity is the open source build system for Java, Android, and Kotlin developers.
≈ $114k – $237k per year (Estimated) • Equity • Staff+ • Remote (Europe) • Staff • English
Java
Kotlin
Python
JavaScript
Java
Gradle
Maven
Micronaut
Quarkus
AI/ML
AI Agents
Context Engineering
Frontend
npm
Mobile
JUnit
DevOps
AWS
Docker
Kubernetes
Alpaca is a developer-first financial infrastructure, clearing, and brokerage API enterprise headquartered in San Mateo, California. Founded in 2015 by Yoshi Yokokawa and Hitoshi Harada, the company has raised over $320 million in venture funding - including a $150 million Series D at a $1.15 billion valuation led by Drive Capital, alongside Citadel Securities, Portage, and Horizons Ventures.
HQ: San Mateo, United States • Cybersecurity • Blockchain & Crypto • Financial Services • FinTech • Capital Markets • Est. 2015
Equity • Remote (Europe)
C++
Go
Java
Python
Rust
Scala
AI/ML
Spark
DevOps
AWS
Heroku
Equity • Senior • Remote (EU) • Senior
Go
Node JS
JavaScript
Node JS
Commander.js
AI/ML
Claude
Claude Code
Cursor
OpenAI Codex
DevOps
gRPC
Management
Slack
Equity • Middle • 3+ years exp • Remote (EU) • Bachelor's Degree • Middle
Python
SQL
Databases
Google Bigtable
AI/ML
Spark
DevOps
Docker
Kubernetes
AWS
Azure
GCP
Google GKE
Grafana
gRPC
Prometheus
WebSockets
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.
HQ: London, United Kingdom • Artificial Intelligence • Software • Information Technology • 1001-5000 employees • Est. 2004
≈ $114k – $255k per year (Estimated) • Lead • Remote • Bachelor's Degree • Freelance • Staff
C++
Go
Python
Rust
DevOps
Ubuntu
≈ $114k – $256k per year (Estimated) • Lead • Remote • Bachelor's Degree • Principal
C++
Go
Python
Rust
TypeScript
SQL
DevOps
Ubuntu
Debian
Docker
gRPC
Kubernetes
OpenStack
≈ $66k – $172k per year (Estimated) • Junior • Remote • Bachelor's Degree • Internship • Junior
Bash
C++
Go
JavaScript
Python
Rust
DevOps
Kubernetes
Ubuntu
Debian
Fedora
Muck Rack is a Public Relations Management platform that helps organizations build relationships with the media, manage crisis risk and demonstrate PR's impact on business outcomes.
Software • News Agencies • Sales & Marketing
$110k – $128k per year • Senior • 5+ years exp • Remote (United Kingdom, Bulgaria, Ireland) • Relocation • PhD • Full-Time • Senior
JavaScript
Python
TypeScript
Python
Celery
Django
Databases
Apache Kafka
ElasticSearch
MySQL
PostgreSQL
Frontend
Vue.js
Cybersecurity
GDPR
$110k – $128k per year • Senior • 5+ years exp • Remote (Bulgaria, Ireland) • Relocation • PhD • Full-Time • Senior
Python
JavaScript
Python
Celery
Django
Databases
Apache Kafka
MySQL
AI/ML
Claude
Copilot
Frontend
Vue.js
DevOps
Git
Rest API
GitHub
Cybersecurity
GDPR
Marketing
Salesforce
Digital marketing tools to grow your audience faster and drive revenue smarter. Backed by 24/7 award-winning support. Check it out now!
Sales & Marketing • Email Services & Providers • Email Marketing
$60k – $75k per year • Middle • 4+ years exp • Remote (EMEA) • Contractor • Middle • English
JavaScript
PHP
SQL
Go
Node JS
Ruby
PHP
Laravel
Databases
Redis
ElasticSearch
Frontend
React.js
Vue.js
DevOps
Git
Design
Canva
Connect your product & AI agents with 900+ APIs. Build, run, and maintain integrations with AI in code, on infrastructure built for scale.
San Francisco • AI Agents
$140k – $220k per year • Staff+ • 10+ years exp • Remote (LATAM, Europe, North America) • Full-Time • Staff
Node JS
JavaScript
AI/ML
Replit
Vapi
DevOps
AWS
Netlify
GitHub
Cybersecurity
Okta
Snyk
$140k – $220k per year • Staff+ • 10+ years exp • Remote (LATAM, Europe, North America) • Full-Time • Staff
Node JS
JavaScript
AI/ML
Replit
Vapi
DevOps
AWS
Netlify
GitHub
Cybersecurity
Okta
Snyk
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).
HQ: San Mateo, United States • Big Data • Information Technology • Database Management
Lead • 8+ years exp • Remote (EMEA) • Cofounder • Staff
Java
Databases
Neo4j
PostgreSQL
Apache Kafka
AI/ML
Knowledge Graph
LangChain
LlamaIndex
GraphRAG
Mobile
Clean Architecture
DevOps
CI/CD
Docker
Senior • 8+ years exp • Remote (EMEA) • Cofounder • Senior
Java
Databases
Neo4j
PostgreSQL
Apache Kafka
AI/ML
Knowledge Graph
Mobile
Clean Architecture
DevOps
CI/CD
Docker
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.
HQ: Miami, United States • Information Technology • Virtualization • DevOps
Equity • Senior • Remote (EU) • Visa sponsorship • Senior
Go
TypeScript
AI/ML
AI Agents
DeepSeek
MiniMax
Anthropic
Model Context Protocol
OpenAI
DevOps
AWS
Azure
CI/CD
GCP
Grafana
Kubernetes
OpenTelemetry
Prometheus
Cybersecurity
Least Privilege
Equity • Senior • Remote (EU, Europe) • Relocation • Visa sponsorship • Senior
Go
AI/ML
AI Agents
Hugging Face
DevOps
Akamai
Amazon EKS
AWS
Azure
Azure AKS
containerd
CRI-O
GCP
Google GKE
gRPC
Kubernetes
Equity • Senior • Remote (EU, Europe) • Visa sponsorship • Senior
PostgreSQL
AI/ML
Hugging Face
Time Series Forecasting
DevOps
Akamai
AWS
Azure
CI/CD
GCP
Grafana
Karpenter
Kubernetes
OpenTelemetry
Prometheus
ArgoCD
GitLab CI
GitOps
gRPC
Loki
GitLab
Zuhlke is a Swiss engineering and innovation company founded in 1968 and based near Zurich. It develops software, medical devices and industrial products for clients from concept through to production. The employee-owned group operates across Europe and Asia with around two thousand specialists.
HQ: Zurich, Switzerland • 501-1000 employees • Est. 1968
Middle • 3+ years exp • In office (Sofia, Bulgaria) • Full-Time • Middle • German • English
C#
Java
Node JS
Python
SQL
TypeScript
JavaScript
C#
.NET
Java
Spring Boot
Spring Data JPA
Spring Security
Databases
Oracle
PostgreSQL
AI/ML
Claude
Copilot
Cursor
LLM
Frontend
Angular
React.js
Vue.js
Mobile
Dependency Injection
DevOps
Azure AKS
CI/CD
GitHub Actions
Helm
Istio
Jenkins
Kubernetes
Terraform
Azure
GitHub
ETAP is an electrical engineering software company headquartered in Irvine, California, and was founded in 1986. The company develops an integrated electrical digital twin platform for the design, simulation, operation, and automation of generation, transmission, distribution, and industrial power systems. Operating as an independent subsidiary of Schneider Electric, the firm provides its solutions to utilities, data centers, and industrial facilities through a global network of offices and partners.
HQ: Irvine, United States • Energy Management • Electrical & Electronic Engineering • Science & Engineering • Power Grid • Energy & Utilities • Software • Simulation & Digital Twin • Information Technology • 1001-5000 employees • Est. 1986
In office (Sofia, Bulgaria) • Bachelor's Degree • Full-Time • English: B2
C#
SQL
C#
.NET
Entity Framework Core
Robotics
Digital Twin
Verified live · 2 hours ago
7 days ago
Developer
In office (Sofia, Bulgaria) • Bachelor's Degree • Full-Time • English: B2
C#
F#
SQL
JavaScript
TypeScript
C#
.NET
Entity Framework Core
Robotics
Digital Twin
Verified live · 2 hours ago
1 month ago
Developer
In office (Sofia, Bulgaria) • Full-Time
CI/CD
Configuration Management
Robotics
Digital Twin
MLabs is a global software engineering consultancy specializing in high-assurance software engineering, formal verification, and mission-critical systems. Founded in 2018, the company focuses on functional programming languages like Haskell and Rust to build secure, high-performance infrastructure for blockchain, Web3, fintech, and AI projects.
HQ: London, United Kingdom • Information Technology • Blockchain & Crypto • Software
$70k – $93k per year • Remote (Europe)
DXC Technology is an American multinational information technology services and consulting company headquartered in Ashburn, Virginia. Formed in 2017 through the merger of Computer Sciences Corporation (CSC) and the Enterprise Services business of Hewlett Packard Enterprise (HPE), it trades publicly on the NYSE under the ticker DXC.
HQ: Ashburn, United States • Information Technology • IT Outsourcing • IT Consulting • 1001-5000 employees • Est. 2017
In office (Sofia, Bulgaria) • Bachelor's Degree • Full-Time
Java
SQL
Java
Maven
Databases
Oracle
DevOps
CI/CD
Git
Jenkins
Rest API
QA
Postman
Middle • 4+ years exp • In office (Sofia, Bulgaria) • Full-Time • Middle • Italian: C1
JavaScript
SQL
TypeScript
Databases
Oracle
Frontend
Angular
React.js
Senior • 7+ years exp • In office (Sofia, Bulgaria) • Full-Time • Senior
JavaScript
SQL
Databases
MS SQL
Oracle
Frontend
React.js
DevOps
AWS
Azure
CI/CD
RunPod is a cloud computing company headquartered in Mount Laurel, New Jersey, and founded in 2022. The company provides a specialized AI developer cloud featuring on-demand GPU instances, serverless GPU endpoints, and multi-node GPU clusters for training and inference. It operates a global infrastructure across more than 30 regions, serving over one million developers with scalable compute resources for machine learning and generative AI workloads.
HQ: Mount Laurel, United States • IT Infrastructure • LLM & Generative AI • Machine Learning • Artificial Intelligence • Hardware • AI Infrastructure • Information Technology • Cloud Computing • Est. 2022
$100k – $180k per year • Equity • Middle • 3+ years exp • Remote (EMEA, United States) • Bachelor's Degree • Full-Time • Middle
Go
JavaScript
Node JS
Python
SQL
Python
Django
Flask
Databases
MySQL
PostgreSQL
AI/ML
Fine-tuning
LLM
PyTorch
RunPod
AI Agents
Frontend
React.js
DevOps
Docker
Ubuntu
Smartsheet is a leading enterprise work management platform that enables organizations to plan, track, automate, and report on work at scale. Combining the familiarity of spreadsheets with powerful features like automated workflows, dynamic dashboards, and project tracking tools, it enhances team collaboration and operational efficiency.
HQ: Bellevue, United States • Software • Productivity Software • Project Management • Est. 2005
Middle • 3+ years exp • Remote (Bulgaria) • Middle
Java
Kotlin
Objective-C
Swift
Java
RxJava
AI/ML
AI Agents
Mobile
Clean Architecture
JUnit
Management
Smartsheet
Lead • Remote (Bulgaria) • Principal
C++
Java
Python
SQL
AI/ML
AI Agents
Management
Smartsheet
$68k – $81k per year • Senior • 5+ years exp • Singapore • Remote (Bulgaria) • Full-Time • Senior
Go
Java
Kotlin
Python
TypeScript
JavaScript
AI/ML
AI Agents
Claude
Copilot
Cursor
Edge AI
Frontend
GraphQL
Jotai
Material UI
Radix UI
React Query
React.js
Redux
Redux Toolkit
shadcn/ui
Zustand
Tailwind CSS
Fabric.js
Mobile
State Management
DevOps
AWS
GitHub
Management
Smartsheet
QA
Cypress
Jest
Playwright
Sopra Steria Poland is the Polish subsidiary of the European IT and consulting group Sopra Steria. It delivers information technology services including software development, consulting, and business process support for clients in various economic sectors.
HQ: Warsaw, Poland • Software • Information Technology • IT Consulting • 5000+ employees
Middle • Remote/Hybrid (Sofia, Bulgaria) • Full-Time • Middle • German (Optional)
Python
Python
FastAPI
Poetry
Ruff
Databases
pgvector
Pinecone
Weaviate
PostgreSQL
AI/ML
AI Agents
Copilot
Cursor
LangChain
Langfuse
LangGraph
LlamaIndex
LLM
MLFlow
RAG
Vertex AI
Anthropic
LLM Guardrails
OpenAI
Structured Outputs
A2A
Model Context Protocol
DevOps
Rest API
Vector
GitHub
CI/CD
Docker
GitHub Actions
GitLab CI
Kubernetes
GitLab
Salary range
| Seniority |
Jobs |
25% |
Median |
75% |
| Senior |
30 |
$114K |
$140K |
$200K |
| All levels |
48 |
$114K |
$150K |
$200K |
Based only on the listings that state pay. Gross annual amounts, converted to USD so roles in different currencies stay comparable.
The market right now
Alion currently lists 234 open Backend Developer jobs in Sofia from 107 companies. 23 of them were posted or refreshed in the last seven days. 83 of the employers have posted something in the last three months, which is the pool worth watching if you are starting a search now. Every listing links straight to the employer, so you apply on their own board rather than through an intermediary.
What these roles pay
48 of these Backend Developer jobs in Sofia state pay directly. Across them the middle half of the market sits between $114K and $200K a year, with a median of $150K. Figures are gross annual amounts converted to US dollars, so roles in different currencies stay comparable.
Where the work is
The largest concentrations of these roles are Bulgaria (43), Poland (9), Ireland (3), Netherlands (3), and Spain (3). 85% of the listings are fully remote and a further 6% are hybrid, so a large part of this market is open to you regardless of where you live.
Who is hiring
The employers with the most open Backend Developer jobs in Sofia right now are Canonical (32), Speechify (11), Alpaca (7), Blockchain Capital (5), Fliff (5), and DXC Technology (4). Each company page on Alion carries its size, funding stage, tech stack and every other position it has open, so you can judge the employer before you spend an evening on the application.
What employers ask for
Reading across the current listings, the tools that come up most often are Python (99), Kubernetes (90), JavaScript (81), AWS (77), PostgreSQL (75), CI/CD (69), TypeScript (61), and Docker (60). The counts are how many of these openings name each one, which is a better guide to what is actually being hired for than a generic skills list.
Relocation, visas and equity
Of the current Backend Developer jobs in Sofia, 9 state visa sponsorship, 8 offer a relocation package, and 41 include equity. These are filters on the list above, so you can narrow it to the ones that make a move possible for you.
