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Develop and operate APIs supporting iOS and Android apps, covering design, code review, endpoint changes, performance tuning, Datadog monitoring, and OpenAPI documentation.
This backend engineering role develops, designs, refactors, and operates APIs that support the iOS and Android applications of crowdworks.jp. The work covers API development across api/v1 and api/v3, code reviews, and changes required for new application initiatives.
Responsibilities include investigating backend requirements for new app features, adding or modifying endpoints, and proposing API designs that account for the constraints and usage scenarios of both mobile platforms. The role also includes improving performance in a large codebase through EXPLAIN analysis, resolving N+1 query issues, and optimizing indexes.
Application-facing endpoints are monitored and improved using Datadog, with attention to latency and error rates. API specifications currently maintained through Notion are to be organized into OpenAPI (Swagger), including the development and maintenance of clear schemas.
The position supports the transition of the application development organization from a primarily outsourced structure to an in-house model led by regular employees. It is responsible for reducing dependence on individual engineers and limiting knowledge silos across the product. The engineer can take ownership of API endpoint design and decisions about endpoint retirement, while contributing to both technical debt reduction and product initiatives.
Design decisions are documented and shared through practices and materials such as ADRs (Architecture Decision Records) and GemDoc. The supplied posting does not specify required education, years of experience, or other formal qualifications.
The stated work arrangement is the head office or remote work. The office is located in Azabudai, Minato-ku, Tokyo. No salary, working hours, employment term, language requirement, or visa condition is stated in the supplied posting.
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About CrowdWorks
CrowdWorks operates one of Japan's largest crowdsourcing marketplaces, matching freelancers with companies for online work.
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