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Senior Backend Developer

  • Remote
    • Sofia, Sofia, Bulgaria
    • Nicosia, Lefkosia, Cyprus
    • Zagreb, Zagrebačka županija, Croatia
    • Praha, Praha, Hlavní město, Czechia
    • Tallinn, Harjumaa, Estonia
    • Athens, Anatolikí Makedonía kai Thráki, Greece
    • Budapest, Budapest, Hungary
    • Valletta, Valletta, Malta
    • Chișinău, Chișinău, Moldova, Republic of
    • Warsaw, Mazowieckie, Poland
    • Lisbon, Lisboa, Portugal
    • Bratislava, Bratislavský kraj, Slovakia
    • Ljubljana, Ljubljana, Slovenia
    • Barcelone , Catalunya [Cataluña], Spain
    • Bucharest, București, Romania
    +14 more

Job description

We’re looking for a skilled Backend Developer to help build our next-generation Enterprise VPN platform, enabling secure access and Zero Trust networking for modern teams and organizations.

You’ll work on designing and developing secure, scalable APIs and backend services responsible for user access, session management, and policy enforcement.

The product is in active development, is a startup product and you'll join the foundational team shaping the architecture and direction of the platform. This is a high-impact technical role where your decisions will influence both product direction and company growth.

Our philosophy is that we are a small, closely-knit team, and we care deeply about you:

  • Competitive pay rates.

  • Fully remote work environments.

  • Self-managed time off.


Responsibilities:

  • Design and maintain secure, scalable, and observable backend services using Node.js, TypeScript, and NestJS

  • Build and evolve RESTful APIs with robust authentication, authorization, and access control

  • Collaborate with the architecture team to improve system design and performance

  • Write and maintain unit, integration, and end-to-end tests

  • Participate in code reviews, design discussions, and agile ceremonies

  • Support CI/CD workflows and contribute to deployment pipelines

Job requirements

  • 6+ years of backend development experience with Node.js and TypeScript

  • Proficiency with NestJS, and ecosystem i.e. RxJS, Jest, Axios, Helmet, Pino, and Supertest)

  • Deep understanding of RESTful API design and familiarity with gRPC, Protocol Buffers, and GraphQL

  • Solid grasp of networking fundamentals (TCP/IP, UDP, DNS, TLS/SSL, firewalls); hands-on experience with Linux networking (i.e. nftables, iptables, conntrack)

  • Strong expertise in authentication and authorization protocols (i.e. OAuth 2.0, OpenID Connect, JWT, and SAML)

  • Experience building multi-tenant, high-availability, and secure client-server applications

  • Hands-on experience with CI/CD pipelines (ArgoCD preferably), Docker, and Testcontainers

  • Familiarity with both relational and non-relational databases (PostgreSQL, Redis) and message brokers (i.e. RabbitMQ, MQTT, SNS/SQS)

  • Strong experience with cloud platforms (preferably AWS: EC2, ECS, Lambda, IAM)

  • Proven ability to write and review clean, secure, and maintainable code within a monorepo architecture

  • Excellent communication skills and ability to work independently in a remote team

Nice to Have

  • Background in VPN technologies, access management, or cybersecurity

  • Experience with policy engines (e.g., OPA, Cedar)

  • Familiarity with Cloudflare (e.g., Workers, DNS, WAF)

  • Exposure to SaaS infrastructure and Kubernetes orchestration

  • Experience scaling high-traffic, production-grade systems

  • Prior experience in a startup environment

  • BSc/MSc in Computer Science, Engineering, or related field

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