📋 External Recruiting Agencies

Mindrift is an AI talent marketplace and crowdsourcing platform that connects freelance specialists with project-based AI training and testing opportunities for third-party tech companies.

This company was flagged and excluded from default search results. Proceed with caution.

Mindrift
Posted 1mo ago

Senior Software Engineer - AI Code Testing & Evaluation

Mindrift
Sofia, Sofia City Province, Bulgaria
$40/hrRemotePart Time
Responsibilities
  • building environments
  • designing tasks
  • writing tests
Requirements
  • 5+ years software development
  • Proficiency with Python (FastAPI)
  • JavaScript/TypeScript (React)
  • Docker
  • Postgres, Kafka, Redis
  • Experience writing functional/integration tests
  • English B2+
Technical tools mentioned
PythonFastAPIJavaScriptTypeScriptReactDockerPostgresKafkaRedis

Job description

Please submit your CV in English and indicate your level of English proficiency.

Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based.

What this opportunity involves 

We're building a dataset to evaluate AI coding agents - how well a model handles real-world developer tasks.

You'll create challenging tasks and evaluation criteria within realistic simulated environments:

  • Build realistic developer environments - a virtual company with codebase, infrastructure, and context (tickets, docs, conversations) that forms a believable development history
  • Design tasks from intermediate states of these environments - craft the prompt, define what "solved" means, and ensure the task is solvable by an AI agent
  • Write tests that verify agent solutions - accept all valid approaches and reject incorrect ones, neither too strict nor too lenient
  • Iterate on tasks and tests based on QA feedback - review agent solutions, analyze failures, and refine until the evaluation is fair and robust

What this is NOT

  • Not data labeling
  • Not prompt engineering
  • Not writing code from scratch - the agent writes most of the code; you guide and evaluate

What we look for

  • 5+ years in software development
  • Core stack: Python (FastAPI), JavaScript/TypeScript (React), Docker, Postgres, Kafka, Redis
  • Experience writing tests (functional, integration)
  • English proficiency - B2+

Why this is hard 

Frontier models are already good at coding. Creating a task that genuinely challenges the best models is non-trivial. You need to deeply understand where models fail and what scenarios reveal the difference between a good and a bad solution. Tasks have many valid solutions - writing tests that accept all correct solutions and reject incorrect ones is harder than it sounds.

How it works

Apply → Pass qualification(s) → Join a project → Complete tasks → Get paid

Effort estimate

Tasks for this project are estimated to take 20 hours to complete, depending on complexity. This is an estimate and not a schedule requirement; you choose when and how to work. Tasks must be submitted by the deadline and meet the listed acceptance criteria to be accepted.

Compensation

Up to $40/hr equivalent, depending on level and pace. Tasks are estimated at ~20 hours each; you set your own schedule.

Similar jobs

Software Engineer roles near Sofia, Sofia City Province
4h
Save
Mark Applied
Hide
Senior Software Engineer
Sofia, Sofia City Province, Bulgaria
HybridFull Time
Fastmarkets
Fastmarkets: Provides global commodity price benchmarks and market intelligence services.
Strong .NET/C# experience, authentication protocols, OOP, distributed and cloud computing, REST APIs, Angular, Azure, testing, CI/CD, messaging, microservices, and AI coding tools; strong English communication.
.NET, C#, OAuth 2.0, OpenID Connect, Duende IdentityServer, Angular, Azure, Service Fabric, AKS, App Configuration, Blob Storage, RESTful APIs, Azure Service Bus, GitHub Copilot, Claude Code, Excel
1d
Save
Mark Applied
Hide
Senior Software Engineer
Sofia, Sofia City Province, Bulgaria
€7k-€9k/mo RemoteFull Time
Balance
Balance: B2B payment platform for online merchants and marketplaces.
5+ YOERequires 5+ years of software development experience and strong expertise in Node.js, React, and TypeScript, plus RESTful APIs, architecture, Agile, CI/CD, DevOps, problem-solving, and communication skills.
Node.js, React, TypeScript, RESTful APIs, Agile, CI/CD, DevOps, AWS, Azure, GCP
3d
Save
Mark Applied
Hide
Front-end Software Engineer | Betty UK
Sofia or New York City or Toronto or London
OnsiteFull Time
Betty
Betty: Online casino platform for mobile slots and real-money gaming.
5+ YOERequires 5+ years building web applications, React, NextJS server-side rendering, progressive web apps, Redux, performance optimization, automated UI testing, DevOps, security, and English fluency.
React, NextJS, Redux, Redux Toolkit, React Native
3d
Save
Mark Applied
Hide
Staff Software Engineer - AI Applied Engineering
Sofia, Sofia City Province, Bulgaria
RemoteFull Time
Quickbase
Quickbase: Provides a no-code platform for building custom business applications.
Strong React and TypeScript experience; full-stack development; production LLM applications including RAG, agents, tool use, streaming, prompt engineering, monitoring, cost control, and failure handling.
React, TypeScript, Claude Agent SDK, MCP, SSE, RAG, Claude API, Copilot, Cursor, Claude Code, AWS, DynamoDB, Lambda, ECS, Temporal, AWS Step Functions
4d
Save
Mark Applied
Hide
Senior Software Engineer- Angular
Sofia, Sofia-Capital, Bulgaria
€45k-€68k/yr HybridFull Time
Entain
EntainLondon Stock Exchange: ENT: Provides sports betting and online gambling entertainment services.
Expert Angular and TypeScript skills; proficiency in HTML/CSS, Angular CLI, Nx, modern build tooling, performance optimization, design patterns, and software architecture.
TypeScript, JavaScript, Angular, HTML, CSS, Angular CLI, Nx
1w
Save
Mark Applied
Hide
Senior Java Engineer
Sofia or Dubai or Warsaw
HybridFull Time
TPConnects
TPConnects: Provider of modern airline retailing and distribution technology.
5+ YOERequires 5+ years of Java experience, Spring Boot, microservices, REST APIs, AWS, MySQL, software testing, analytical skills, and fluent written and spoken English.
Java, Spring Boot, AWS, MySQL, DynamoDB, ClaudeAI, REST APIs, microservices
1w
Save
Mark Applied
Hide
Senior Software Engineer (Golang)- Payments Experience
Sofia, Sofia City Province, Bulgaria
OnsiteFull Time
SumUp
SumUp: Provides mobile point-of-sale payment solutions for small businesses
Hands-on Go experience, microservices and RESTful APIs, SQL and PostgreSQL, Kubernetes, AWS, and comfort working across Go and Ruby codebases.
Go, Ruby, RESTful APIs, SQL, PostgreSQL, Kubernetes, AWS
1w
Save
Mark Applied
Hide
Senior Software Engineer (Golang)- Payments Experience
Sofia, Sofia City Province, Bulgaria
OnsiteFull Time
SumUp
SumUp: Provides payment and business financial services to small merchants.
Hands-on Go experience, microservices and REST API expertise, SQL and PostgreSQL knowledge, Kubernetes and AWS familiarity, and comfort working across Go and Ruby codebases.
Go, RESTful APIs, SQL, PostgreSQL, Kubernetes, AWS, Ruby