4GOO Holding GmbH

We are developing a next-gen social networking platform and looking for a Developer/Software Engineer Go(Golang)/PHP to join our core backend team. In this role, you will work on building scalable services powering our real-time features, integrating modern infrastructure.What you’ll do:
 

• Develop and maintain core backend services using PHP (Laravel) and Go
• Build and optimize APIs (REST/gRPC) for mobile and web clients
• Design reliable real-time features based on WebSockets
• Work with AWS services (EC2, S3, RDS, SQS) to ensure scalability and fault tolerance
• Collaborate daily with product, frontend, and DevOps teams

Requirements:
 

• 3+ year of experience with Go (Golang) or willingness to deepen Go expertise
• 2+ years of professional experience with PHP (Laravel)
• Experience building and consuming APIs (REST, gRPC is a plus)
• Practical experience with AWS services (especially S3, SQS, EC2, RDS)
• Familiarity with WebSocket-based communication
• Good understanding of SQL databases (preferably PostgreSQL)
• Docker basics and experience in containerized environments
• Ability to work independently with third-party SDKs and APIs

Nice to Have:
 

• Experience with event-driven architecture, Pub/Sub, or message queues
• Background with real-time communication platforms or social apps
• Familiarity with Redis, CI/CD pipelines

Our backend is partially built with Go. We’re looking for a full-time Go developer who will take ownership of core backend services and contribute to the integration of our real-time communication layer.What you’ll do:
 

• Develop and maintain scalable backend services in Go
• Integrate and manage our LiveKit infrastructure (self-hosted)
• Implement features like room management, token generation, and participant control
• Build internal APIs (REST/gRPC) for client apps (web, mobile)
• Optimize performance and reliability of audio/video features
• Collaborate with frontend and DevOps teams

Requirements:
 

• 2–4 years of professional experience with Go (Golang)
• Strong understanding of concurrency, goroutines, and channels
• Experience building and maintaining REST or gRPC APIs
• Familiarity with JWT, authentication flows, and session management
• Solid knowledge of PostgreSQL and Redis
• Experience working with Docker and writing maintainable Go services

Nice to have:
 

• Experience with LiveKit or any WebRTC-related project
• Previous work with event-driven architecture, pub/sub, or message queues

Build real-time backend services for a multi-product platform

We are developing a large-scale platform that brings together social networking, video, music, marketplace, and communication features. The project is in active development — no legacy, no long onboarding. We are transitioning from a monolith to microservices and looking for a strong engineer who wants to build new services from scratch.

What You Will Do:

You will own specific business domains and develop backend services in TypeScript:

Domains may include:

• Real-time systems: notifications, WebSockets, presence
• Content services: posts, feeds, comments, reactions
• Social features: user discovery, suggestions, messaging
• Music module: playlists, recommendations, playback APIs
• Admin & moderation tools
• Search, filtering, recommendations
• Analytics, tracking, events
• Third-party integrations and internal tools
• Media: uploads, processing, optimization

Your responsibilities:

• Develop microservices in TypeScript (Node.js / Bun)
• Build REST APIs and real-time endpoints (WebSockets)
• Design PostgreSQL schemas and implement efficient data access
• Use Redis for caching, sessions, queues, pub/sub
• Write clean, type-safe, well-tested code
• Collaborate with the System Architect on service boundaries
• Monitor performance and optimize services
• Integrate with other backend services via API contracts

 Requirements:

• 2+ years of professional TypeScript/Node.js experience
• Strong knowledge of async/await, promises, type system
• Experience with REST API development
• PostgreSQL (schema design, optimization)
• Redis (caching, pub/sub, queues)
• Authentication & authorization (JWT, sessions, OAuth)
• Docker
• Ability to write maintainable, well-tested code (Jest or similar)
• Comfort working in a fast-paced startup environment

 Nice to Have:

• WebSockets / real-time systems
• Microservices architecture
• gRPC or message brokers (Kafka, NATS, Redis Streams, BullMQ)
• NestJS
• Prisma / TypeORM / Drizzle
• AWS / GCP
• Observability tools (APM, tracing, logging)

 Why This Role Is Exciting:

• Greenfield development — build new services without legacy
• Ownership — you fully own your business domain
• Direct impact — influence architecture during key growth phase
• Real-time features — high impact, user-facing systems
• Fast delivery — see your work go live quickly

DevOps Engineer (Senior / 5+ years of experience)
We are looking for a highly experienced DevOps Engineer to help us build and maintain a reliable, scalable, and secure infrastructure for a product with high requirements for stability, performance, and security.
Requirements
Experience
 

• 5+ years of commercial experience as a DevOps Engineer / SRE
• Experience working with high-load systems
• Experience supporting production environments
• Strong understanding of CI/CD, Infrastructure as Code, and cloud-native practices

Cloud
• Strong experience with AWS (required)
EC2, S3, RDS, EKS, IAM, VPC, CloudWatch
• Azure or GCP experience is a plus
Containers & Orchestration
 

• Docker
• Kubernetes (EKS or self-managed)
• Helm

CI/CD
 

• GitHub Actions / GitLab CI / Jenkins / CircleCI
• Building CI/CD pipelines from scratch
• Automated deployments

Infrastructure as Code
 

• Terraform
• CloudFormation (nice to have)
• Ansible (nice to have)

Monitoring & Logging
 

• Prometheus / Grafana
• ELK / OpenSearch
• Datadog / New Relic (nice to have)

Security
 

• SSL, secrets management
• IAM, RBAC
• Security best practices
• Backup & disaster recovery

Networking
 

• TCP/IP, DNS, HTTP/S
• Load balancers
• CDN
• VPN

Responsibilities
 

• Designing and maintaining scalable infrastructure
• Building and supporting CI/CD pipelines
• Process automation
• Monitoring, logging, and alerting
• Ensuring high availability (HA)
• Participating in product architecture design
• Working closely with developers on deployments
• Environment management (dev / staging / prod)
• Infrastructure security

Nice to have
 

• High-load systems experience
• Media / streaming / real-time systems
• Microservices
• FinOps / cost optimization
• SOC2 / ISO / GDPR exposure

4GOO is a global social platform for creators.
Our product includes:

• Web platform
• iOS application
• Android application
• Complex multi-service architecture

We are looking for a Business Analyst (Middle+/Senior) with strong experience in product and technical documentation who will work closely with PM, Design Lead, Frontend/Backend/Mobile Teams, and QA.

What You Will Do

• Write BRD/PRD/SRS for complex cross-platform features (Web + iOS + Android)
• Create User Stories with Gherkin acceptance criteria
• Define API requirements, data flows, integration specifications
• Build BPMN/UML diagrams, User Flows, State diagrams
• Support the Confluence knowledge base
• Collaborate with PM, Design, Dev Teams, and QA throughout the full development lifecycle
• Participate in backlog refinement, discovery, sprint planning, demos, and retrospectives

Must-Have Requirements

• 3+ years of experience as a Business Analyst or System Analyst
• Strong experience writing BRD, PRD, SRS, User Stories, Acceptance Criteria
• Experience with multi-platform products (Web + Mobile)
• Understanding of REST API, JSON, integrations, system interactions
• Ability to model business processes using BPMN/UML
• Tools: Jira, Confluence, Figma, Miro
• English: B2+ (documentation + communication with stakeholders)

Nice to Have

• Experience in Social Platforms / Creator Economy / Marketplace / E-commerce
• Experience with analytics tools: Amplitude, Mixpanel, Google Analytics
• Understanding of Fintech/Payments flows
• Basic SQL
• Knowledge of iOS HIG / Material Design

Soft Skills

• Strong analytical and problem-solving mindset
• High attention to detail (documentation with no gaps)
• Clear communication — ability to bridge business & technical teams
• Proactive approach, ownership mindset
• Adaptability in a fast-paced startup environment