ALFRED LOTSU
Accra
Summary
Dynamic Backend Engineer with a proven track record at Real-time Learning Platform, architecting scalable systems in Go. Expert in microservices and real-time features, achieving a 60% reduction in database load. Adept at problem-solving and collaboration, leveraging skills in PostgreSQL and NATS to deliver high-performance solutions.
Overview
3
3
years of professional experience
1
1
Certification
Work History
Backend Engineer
Real-time Learning Platform
03.2022 - Current
- Architected scalable Go backend handling 1000+ concurrent users with <200ms latency
- Designed microservices using NATS & JetStream for decoupled, durable message flows
- Integrated PostgreSQL (transactions) and Redis (cache), reducing DB load by 60%
- Implemented real-time socket features (chat, Q&A, notifications) via Pusher
- Built search indexing system with Typesense synced via NATS, achieving sub-100ms queries
- Technologies: Go, PostgreSQL, Redis, NATS JetStream, Typesense, Pusher, Docker
Desktop Developer
Mining Backfill Analysis Tool
03.2023 - 03.2024
- Built cross-platform app with Svelte + Tauri for Canadian mining engineers
- Achieved real-time calculations with zero crashes under heavy data loads
- Currently used in production for critical backfill decisions
- Technologies: Svelte, Tauri, Rust, SQLite, Custom algorithms
- Designed innovative backfill analysis tools supporting mining operations and project assessments.
Education
BSc - Civil Engineering
Kwame Nkrumah University of Science and Technology (KNUST)
Kumasi, Ghana01.2022
Skills
- Languages: Go, Rust, TypeScript/JavaScript, SQL/NoSQL, Kotlin, Swift
- Databases: PostgreSQL, Redis, DynamoDB and Typesense
- Event Systems: NATS, NATS JetStream, Pusher WebSockets
- Cloud & DevOps: AWS (DynamoDB, ECS, S3, Cloud), Docker, Railway, Neontech, Upstash, Momento
- Frontend Tools: SvelteKit, Svelte, Supabase (Auth)
- Desktop Development: Tauri, Slint
- Monitoring and testing: unit, integration, performance monitoring
Projects
Real-Time Event-Driven Search System, Engineered full-text search system using Go + Typesense with NATS for live updates, Built eventual consistency mechanism with zero data loss, Integrated read replicas to improve performance by 40%, High-Throughput API for Social Features, Developed Go service for likes/comments retrieval using Upstash Redis, Optimized for 1000+ RPS; reduced response latency from 500ms → 50ms, ETL Pipeline with NATS JetStream, Constructed low-latency ETL pipeline for analytics data, Achieved exactly-once delivery with 10k+ events/day using automatic retries
Websites
Certification
- Apollo Certified - Graph Developer Associate
References
References available upon request.
HIGHLIGHTS & IMPACT
- Reliability: 99.9% uptime using robust error handling and circuit breakers
- Scalability: Architected services that scaled 10x with no redesign
- Efficiency: Cut infrastructure costs by 30% with caching and smart resource use
Timeline
Desktop Developer
Mining Backfill Analysis Tool
03.2023 - 03.2024
Backend Engineer
Real-time Learning Platform
03.2022 - Current
BSc - Civil Engineering
Kwame Nkrumah University of Science and Technology (KNUST)
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