Senior Backend Javascript Dev (NodeJS, Typescript, SQL)

Job description

WHO ARE WE? 

Digital Unicorn is a French digital agency with a passionate and ambitious team. We specialize in:

• Mobile Application Development
• Website Development
• AI/Deep Learning
• UX/UI Design

We’re more than just a company — we’re a small hub for those who want to step into an international working environment. Here, you’ll train, work, and build your career foundation, all while growing friendships that last.

At Digital Unicorn:

• We share and support each other
• We build meaningful products for startups
• We create a space where you can enjoy working and growing

WE ARE HIRING: Senior Backend Javascript Developer 

KEY RESPONSIBILITIES

• Design and develop scalable backend systems and APIs
• Architect database schemas and optimize query performance
• Implement caching strategies using Redis for high-traffic applications
• Build real-time features using WebSocket and event-driven architecture
• Integrate third-party services and payment gateways
• Mentor junior developers and establish coding standards
• Collaborate with frontend teams and DevOps for seamless deployment

TECHNICAL EXPERTISE

• Performance & Scalability:
  • Load balancing and horizontal scaling strategies
  • Database sharding and replication
  • Memory management and garbage collection optimization
  • API rate limiting and throttling
  • Basic English communication skills
• Security:
  • Input validation and sanitization
  • SQL injection and XSS prevention
  • Secure authentication and authorization
  • Data encryption and HTTPS implementation

Your skills and experience

Experience: 5+ years in backend JavaScript development with enterprise-level applications

Hard Skills:

• JavaScript Core: Expert-level ES6+, async/await, closures, prototypes, event loop
• Node.js: Advanced Node.js runtime, NPM ecosystem, performance optimization
• Frameworks: Proficient in NestJS, Express.js
• TypeScript: Strong typing, interfaces, generics, decorators
• API Development: RESTful APIs, GraphQL, WebSocket, microservices architecture
• Authentication: JWT, OAuth 2.0, passport.js, session management

Database Expertise:

• SQL: Advanced PostgreSQL/MySQL, complex queries, indexing, performance tuning
• NoSQL: MongoDB, DynamoDB, document design, aggregation pipelines
• Cache: Redis implementation, caching strategies, session storage
• ORM/ODM: Prisma, TypeORM, Sequelize, Mongoose

Why you'll love working here

• Training policy, salary, and bonus that match your skills and experience
• Provision of full of devices for work
• 100% salary during the probation period
• Full insurance policies
• Dynamic, comfortable, and creative working environment
• Team Building events/ company trips every year
• Snacks and fruits for breaks
• Sports activities to recharge positive energies
• Immerse in an English-speaking environment for professional foreign communication