Position: Senior Java Backend Engineer / Technical Lead (Telegram Custom Development)

Objective:

Integrate Telegram with internal services to establish a closed loop of “Message → User → Ticket → SLA → Reporting.”

Enable horizontal scaling for multiple clients/teams, ensuring permission isolation and compliance traceability.

Core Responsibilities

Messaging Layer:

• Integrate with Telegram (preferring Bot API; using TDLib/MTProto when necessary) to implement message retrieval, deduplication, archiving, and rule engine.
• Manage rate limiting, idempotency, retry mechanisms, and dead-letter queues.
• Implement sensitive word filtering, risk control strategies, and audit logging.

Account System:

• Support registration and login (email/phone/OAuth/OIDC), 2FA, device fingerprinting, and anomalous login alerts.
• Implement RBAC/ABAC permission models with strict multi-tenant isolation (tenant_id enforcement).

Administration Console:

• Handle customer service tickets, conversation merging, SLA timers, escalation workflows, and quality sampling.
• Provide reporting and visualization (revenue, conversation volume, response times, resolution rates).

Platform Engineering:

• Design microservices, define API standards, manage canary releases and rollbacks, and ensure observability (metrics, logs, traces).
• Implement DevSecOps practices: dependency and image scanning, secrets and credential management, and data encryption (at rest and in transit).

Compliance and Data:

• Ensure compliance with Telegram TOS, implement user consent and data minimization, and define data retention policies.
• Handle GDPR/APPI requests (data export/deletion) and produce audit reports.

Tech Stack

• Backend: Java 17, Spring Boot 3.x, Spring Security, JPA/MyBatis, MapStruct.
• Storage: PostgreSQL/MySQL, Redis, S3-compatible object storage.
• Messaging: Kafka, RabbitMQ.
• APIs: REST/gRPC, OpenAPI, WebSocket (as needed).
• Deployment: Docker, Kubernetes, Helm, GitHub Actions/GitLab CI.
• Observability: Prometheus & Grafana, ELK/EFK, OpenTelemetry.
• Telegram: Bot API, TDLib, MTProto (selected based on requirements).

Qualifications:

• 5–10 years of backend development experience with a track record of leading high-concurrency system design and implementation.
• Experience in frontline scenarios (customer service, IM, ticketing, CRM, enterprise key account tools).
• Strong engineering mindset with emphasis on code quality, test coverage, and SLA/SLO.
• Excellent cross-team communication skills (product, compliance, operations).