Senior Back-End Developer .NET 8, React

Job not on LinkedIn

🕒 June 13

🇧🇷 Brazil – Remote

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 43%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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King of Languages

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 2021

📚 Education

👥 B2C

Education • B2C

King of Languages is a 100% online English school offering personalized, immersion-focused language courses and private lessons. It provides up to five one-on-one classes per week with flexible scheduling, multimedia learning resources, continuous student support, and a 24/7 study platform. The school serves learners from age 11 upward and handles payments via common local methods (card, boleto, PIX), emphasizing practical communicative and cultural skills to achieve fluency.

📋 Description

• Develop and maintain scalable, secure, and well-structured APIs in .NET 8. • Implement queues and background jobs using RabbitMQ and Hangfire. • Optimize queries in MySQL. • Apply caching with Redis, including TTL, cache invalidation, and cache-aside patterns. • Automate builds, tests, and deployments through CI/CD. • Create or adjust front-end interfaces in React + TypeScript. • Ensure clean integration between front end and back end. • Configure and maintain Dockerized environments, including staging and production. • Monitor logs, metrics, and alerts. • Proactively troubleshoot technical issues. • Participate in architectural decision-making. • Propose continuous improvements to processes and systems. • Work under tight deadlines and deliver quickly without compromising quality.

🎯 Requirements

• Minimum 3–5 years of experience with .NET Core 6+ (preferably .NET 8). • Strong knowledge of ASP.NET Core, EF Core, RESTful APIs, and software architecture best practices (SOLID and Clean Architecture). • Experience with RabbitMQ, Redis, MySQL, and query optimization in production environments. • Knowledge of React + TypeScript for integration and maintenance of full-stack applications. • Experience with Docker, Docker Compose, and CI/CD pipelines. • Familiarity with observability, structured logging, and application monitoring. • Ability to participate in architectural decisions and propose scalable technical solutions.

🏖️ Benefits

• Salary negotiable + full benefits