Who we are
Joi AI is a platform for AI-lationships — personalized, emotionally intelligent connections between people and AI characters. We build characters that have their own personality, mood, and voice: they can ignore you, argue with you, miss you. If you've seen the film Her — that's roughly where we're headed.
Our platform serves both emotional and intimate needs without judgment, built on the values of rejection-free connection, sex positivity, freedom to be yourself, and ethical integrity. Today we have tens of millions of conversations on the platform. Our goal: 10% of the global population in long-term AI-lationships with our characters.
Joi Lab (joilab.ai) is our open research arm — we build open-source generative models, agent architectures, and training infrastructure. All code, weights, and data are public. We're not chasing the next ChatGPT wrapper; we're working on true AI agency: persistent memory, self-modification, self-authored constraints.
The role
You'll join a team of 15–20 people who actually know each other's work, building a product with a real user base — the kind where your fingerprints are on everything you ship.
The work sits at the intersection of high-load architecture, system design, and AI integration. Active product development, a long backlog, and real UX experimentation — this is not maintenance mode.
The niche is mainstream and the audience is growing. You get startup energy without existential uncertainty about whether anyone wants what you're building. Ownership is high by default — in a team this size, it always is.
WHAT YOU’LL DO
- Contribute to the architecture of high-load services and grow the existing C# / .NET Core codebase.
- Build new product features and integrations, including the AI layer (voice, real-time, and — on the horizon — video and emotion recognition).
- Design and operate async pipelines on RabbitMQ: delivery guarantees, idempotency, error handling, backpressure.
- Work with MS SQL schema and queries under load: indexes, execution plans, hot-path optimization.
- Hold the bar on code quality across the team: code review, testing, observability, engineering standards; influence technical decisions beyond your immediate area.
WHAT WE’RE LOOKING FOR
- 5+ years of commercial C# / .NET development, including 2+ years on .NET Core in production.
- Real distributed-systems and high-load experience: you can reason about throughput, latency, and fault tolerance through specific incidents from your own past, not from a textbook.
- Hands-on experience with message brokers (RabbitMQ preferred; Kafka / Azure Service Bus / NATS acceptable with a high-load track record) and MS SQL Server under load.
- Fluent Russian, ready to work in CET (±2) hours.
WHY JOI
• We're changing the industry and making relationships with AI feel real
• Opportunity to receive company equity
• Joi Lab gives you access to frontier model research, all open-source and free of corporate gatekeeping
• Small team, high trust, high ownership. You see the direct impact of your work
• Ideas turn into live experiments in days, not quarters
• Fully remote, full-time, work from anywhere
• Offline meetups with the team, fully covered by the company
• We cover 100% of training and conference costs
• Health support: join our group insurance plan, or get up to $1,000 a year toward medical costs or a private plan
• Workspace: we cover your office, home office or co-working setup
• 28 days of annual leave
• 7 wellness days a year for life admin or recovery, no sick notes needed
• Subsidised English classes through our corporate discount
• Peer recognition: send each other gratitude bonuses and swap them for swag, massage vouchers or team trips
NEXT STEPS
- Intro call — conversation with the Recruiter
- Technical interview — live coding
- Final interview — system design and team fit
Senior .NET Developer
Who we are
Joi AI is a platform for AI-lationships — personalized, emotionally intelligent connections between people and AI characters. We build characters that have their own personality, mood, and voice: they can ignore you, argue with you, miss you. If you've seen the film Her — that's roughly where we're headed.
Our platform serves both emotional and intimate needs without judgment, built on the values of rejection-free connection, sex positivity, freedom to be yourself, and ethical integrity. Today we have tens of millions of conversations on the platform. Our goal: 10% of the global population in long-term AI-lationships with our characters.
Joi Lab (joilab.ai) is our open research arm — we build open-source generative models, agent architectures, and training infrastructure. All code, weights, and data are public. We're not chasing the next ChatGPT wrapper; we're working on true AI agency: persistent memory, self-modification, self-authored constraints.
The role
You'll join a team of 15–20 people who actually know each other's work, building a product with a real user base — the kind where your fingerprints are on everything you ship.
The work sits at the intersection of high-load architecture, system design, and AI integration. Active product development, a long backlog, and real UX experimentation — this is not maintenance mode.
The niche is mainstream and the audience is growing. You get startup energy without existential uncertainty about whether anyone wants what you're building. Ownership is high by default — in a team this size, it always is.
WHAT YOU’LL DO
- Contribute to the architecture of high-load services and grow the existing C# / .NET Core codebase.
- Build new product features and integrations, including the AI layer (voice, real-time, and — on the horizon — video and emotion recognition).
- Design and operate async pipelines on RabbitMQ: delivery guarantees, idempotency, error handling, backpressure.
- Work with MS SQL schema and queries under load: indexes, execution plans, hot-path optimization.
- Hold the bar on code quality across the team: code review, testing, observability, engineering standards; influence technical decisions beyond your immediate area.
WHAT WE’RE LOOKING FOR
- 5+ years of commercial C# / .NET development, including 2+ years on .NET Core in production.
- Real distributed-systems and high-load experience: you can reason about throughput, latency, and fault tolerance through specific incidents from your own past, not from a textbook.
- Hands-on experience with message brokers (RabbitMQ preferred; Kafka / Azure Service Bus / NATS acceptable with a high-load track record) and MS SQL Server under load.
- Fluent Russian, ready to work in CET (±2) hours.
WHY JOI
• We're changing the industry and making relationships with AI feel real
• Opportunity to receive company equity
• Joi Lab gives you access to frontier model research, all open-source and free of corporate gatekeeping
• Small team, high trust, high ownership. You see the direct impact of your work
• Ideas turn into live experiments in days, not quarters
• Fully remote, full-time, work from anywhere
• Offline meetups with the team, fully covered by the company
• We cover 100% of training and conference costs
• Health support: join our group insurance plan, or get up to $1,000 a year toward medical costs or a private plan
• Workspace: we cover your office, home office or co-working setup
• 28 days of annual leave
• 7 wellness days a year for life admin or recovery, no sick notes needed
• Subsidised English classes through our corporate discount
• Peer recognition: send each other gratitude bonuses and swap them for swag, massage vouchers or team trips
NEXT STEPS
- Intro call — conversation with the Recruiter
- Technical interview — live coding
- Final interview — system design and team fit
Senior .NET Developer
Who we are
Joi AI is a platform for AI-lationships — personalized, emotionally intelligent connections between people and AI characters. We build characters that have their own personality, mood, and voice: they can ignore you, argue with you, miss you. If you've seen the film Her — that's roughly where we're headed.
Our platform serves both emotional and intimate needs without judgment, built on the values of rejection-free connection, sex positivity, freedom to be yourself, and ethical integrity. Today we have tens of millions of conversations on the platform. Our goal: 10% of the global population in long-term AI-lationships with our characters.
Joi Lab (joilab.ai) is our open research arm — we build open-source generative models, agent architectures, and training infrastructure. All code, weights, and data are public. We're not chasing the next ChatGPT wrapper; we're working on true AI agency: persistent memory, self-modification, self-authored constraints.
The role
You'll join a team of 15–20 people who actually know each other's work, building a product with a real user base — the kind where your fingerprints are on everything you ship.
The work sits at the intersection of high-load architecture, system design, and AI integration. Active product development, a long backlog, and real UX experimentation — this is not maintenance mode.
The niche is mainstream and the audience is growing. You get startup energy without existential uncertainty about whether anyone wants what you're building. Ownership is high by default — in a team this size, it always is.
WHAT YOU’LL DO
- Contribute to the architecture of high-load services and grow the existing C# / .NET Core codebase.
- Build new product features and integrations, including the AI layer (voice, real-time, and — on the horizon — video and emotion recognition).
- Design and operate async pipelines on RabbitMQ: delivery guarantees, idempotency, error handling, backpressure.
- Work with MS SQL schema and queries under load: indexes, execution plans, hot-path optimization.
- Hold the bar on code quality across the team: code review, testing, observability, engineering standards; influence technical decisions beyond your immediate area.
WHAT WE’RE LOOKING FOR
- 5+ years of commercial C# / .NET development, including 2+ years on .NET Core in production.
- Real distributed-systems and high-load experience: you can reason about throughput, latency, and fault tolerance through specific incidents from your own past, not from a textbook.
- Hands-on experience with message brokers (RabbitMQ preferred; Kafka / Azure Service Bus / NATS acceptable with a high-load track record) and MS SQL Server under load.
- Fluent Russian, ready to work in CET (±2) hours.
WHY JOI
• We're changing the industry and making relationships with AI feel real
• Opportunity to receive company equity
• Joi Lab gives you access to frontier model research, all open-source and free of corporate gatekeeping
• Small team, high trust, high ownership. You see the direct impact of your work
• Ideas turn into live experiments in days, not quarters
• Fully remote, full-time, work from anywhere
• Offline meetups with the team, fully covered by the company
• We cover 100% of training and conference costs
• Health support: join our group insurance plan, or get up to $1,000 a year toward medical costs or a private plan
• Workspace: we cover your office, home office or co-working setup
• 28 days of annual leave
• 7 wellness days a year for life admin or recovery, no sick notes needed
• Subsidised English classes through our corporate discount
• Peer recognition: send each other gratitude bonuses and swap them for swag, massage vouchers or team trips
NEXT STEPS
- Intro call — conversation with the Recruiter
- Technical interview — live coding
- Final interview — system design and team fit