Remote Backend Developer jobs open to Bulgaria.

Python

Python, End-to-end ownership, Client-facing communication, Full-stack development, Cloud infrastructure, AI-powered development, Production-minded development, Business thinking, Self-management, Timezone flexibility

AE StudioAE Studio is a custom software development and design agency specializing in AI integration and data science, operating as a B2B provider for clients ranging from startups to Fortune 10 companies.

Rust

6+ years backend Rust/distributed systems; AI-assisted development. Also eligible: Cyprus, Hungary, Slovakia, Slovenia

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

5+ years backend/AI systems, LLM inference, APIs/distributed systems; also eligible in Cyprus and Hungary

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

AWS · Azure

2 years of experience, MuleSoft Anypoint Platform, API design, Integration Design patterns, Microservices architecture, Public cloud experience (AWS/Azure), Non-profit sector experience, Excellent debugging skills, Strong communication skills

fusionSpanfusionSpan is a Rockville, MD-based B2B technology consulting firm specializing in Salesforce implementations and managed services for nonprofits and membership organizations.

Unity, AI focus, Social gaming

Java · AWS

4 years of experience, Java, Spring Boot, RESTful APIs, Microservices, Distributed systems, Asynchronous processing, PostgreSQL, Redis, Kafka, AWS, High throughput systems, Idempotent transaction processing

Java · AWS

7 years of experience, Java, Spring Boot, RESTful APIs, Microservices, High-throughput systems, Idempotent transaction-processing, AWS, Kafka, Redis, Distributed systems

Python

~1 year production software engineering, Python, European work authorization, B2B contract, 40+ hours/week

KalepaKalepa builds AI-powered underwriting software that helps commercial insurers assess risks and manage decisions from submission through portfolio management.

Python · SQL

Python, Linux troubleshooting, API design and integration, Asynchronous processing, CI/CD, SQL, AI coding agents, Django, Django REST Framework, Celery, RabbitMQ

Java

5+ years backend, Java, Spring Boot, card issuing/payments, out-of-hours on-call

BVNKBVNK is a UK-based fintech B2B platform specializing in stablecoin payment infrastructure, enabling businesses to send, receive, and convert currencies globally.

3 years of experience, LLMs, CUDA-X APIs, API design, High-quality code, AI-assisted software engineering, Code generation, Programming language design

NVIDIANVIDIA builds accelerated-computing platforms for AI, data centers, gaming, robotics and autonomous vehicles.

TypeScript · Rust

3 years of experience, Rust, Node/Typescript, Security-first mindset, Debugging across OS, network, and application layers, Distributed systems familiarity

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

Python

Enterprise SaaS administration (1,000+ seats), Python or comparable language, Integrating LLM and SaaS APIs, Identity and access management (Okta, OAuth, SCIM, SSO), Operational discipline (intake queues, SLAs), Teaching ability for technical concepts, Clear written communication for documentation, Judgment on capability needs

KrakenKraken is a financial platform where individuals and institutions trade crypto, stocks, ETFs, and futures.

Python · Rust · Ruby

Linux build toolchains, Container images, Debian/RHEL packaging, Continuous integration systems, Shell scripting, Cloud provider experience, Ruby/Go/Python/Rust

GitLabGitLab provides a DevSecOps platform for planning, building, securing and delivering software.

Python · Kotlin · Rust

Go, Kotlin, Rust, Python, SQL, Orchestration systems, Data lifecycle management, Schema evolution, Data correctness, Stateful stream processing, Distributed systems, AI tools proficiency, Clear written communication

DuneDune is a remote-first B2B SaaS platform specializing in multi-chain crypto data analytics, empowering developers and investors with insights into blockchain ecosystems.

JavaScript · PHP · SQL

PHP 8, Laravel, JavaScript, CSS, HTML, Debugging, Incident response, Root-cause analysis, Relational databases, SQL, Git, CI/CD, Autonomous work, Professional English (B2+)

Intel 471Intel 471 is a Wilmington, DE-based B2B cybersecurity company specializing in SaaS-based cyber threat intelligence solutions for enterprises and government agencies worldwide.

GCP · Kubernetes

Go, Kubernetes, Large-scale backend development, Microservices architecture, Performance analysis, Security product architecture, GCP services, Distributed systems optimization, API integration with SaaS applications

CyberhavenCyberhaven provides an AI-native data security platform for protecting data across human and AI-agent workflows.

SQL

Database performance optimization, Strong SQL, Backend engineering, Data architecture design, Lakehouse experience, Schema design for semi-structured data, Streaming ingestion experience, Migration or re-architecture track record

OscilarOscilar is a US-based fintech B2B SaaS provider specializing in AI-native risk decisioning for fraud prevention, credit underwriting, and AML compliance, serving banks and digital organizations.

JavaScript · Python · GCP

5 years of experience, Cloud-native technologies (GCP preferred), Kubernetes, ArgoCD, Terraform, GitHub, Python, JavaScript, Go, Technical leadership, Internal Developer Platforms, Cost optimization

MozillaMozilla is a family of mission-driven organizations behind Firefox, Thunderbird, open-source AI tools and public-interest technology initiatives.

Go · GCP · Kubernetes

Golang, Architectural vision, Distributed microservices, Domain-Driven Design (DDD), High-scale distributed databases, Google Cloud Platform (GCP), Kubernetes, Mentorship

ESL FACEIT GroupESL FACEIT Group creates esports tournaments, leagues, and live events for players and fans.

C++, algorithms, object-oriented programming, Intermediate English

AprioritApriorit is a US-based cybersecurity-focused B2B software engineering company specializing in custom development services for tech enterprises, startups, and Fortune 500 clients, with additional offices in Poland and Cyprus.

Rust · Kubernetes

5 years of experience, Rust, Kubernetes Control Planes, DPU architectures, Datacenter Networking, gRPC/Protobuf, OpenTelemetry, async concurrency models, mock-driven testing, custom Kubernetes operators, high-density infrastructure

MirantisMirantis is a Campbell, California-based B2B company specializing in open source cloud computing and Kubernetes-native AI infrastructure, serving diverse sectors including automotive, healthcare, and financial services.

Java · AWS

5 years of experience, Java 7, Java 8, Oracle, Progress, Liquibase, AWS, Enterprise application design, Object-oriented programming, Agile methodologies, Oil & Gas Upstream knowledge

Netrix GlobalNetrix Global is a global B2B IT consulting and managed services company headquartered in an unspecified location, specializing in cybersecurity, cloud migration, and digital workplace solutions for various industries.

PHP

PHP, SOLID principles, NoSQL (Redis, MongoDB), AI-assisted engineering tools, Cloud-native infrastructure, High-volume transaction applications, Technical documentation, Agile environment, Problem-solving mindset, Empathy in teamwork

Antavo Enterprise Loyalty CloudAntavo provides enterprise loyalty-program software for retail, travel, fashion, and other brands.

Ruby

3 years of experience, Ruby on Rails, PostgreSQL, REST APIs, Sidekiq, Scalable backend development, Debugging, Performance optimization, Clean code practices

PavagoPavago is a remote talent marketplace connecting businesses with pre-vetted professionals.

2 years of experience, Technical document analysis, Cloud infrastructure experience, Attention to detail, Ability to interpret technical concepts, Experience reviewing engineering reports, Familiarity with technical architecture documentation

Weekday AIWeekday provides AI-assisted candidate sourcing and recruiting services for employers.