HR SHIFT

About the Role

We’re looking for a Senior Machine Learning Engineer to join the team that designs, builds, and scales ML systems powering personalization and customer engagement at a massive scale.
You’ll work on production-ready ML pipelines, real-time decision-making systems, and experimentation frameworks that directly impact millions of users worldwide.
 

What You’ll Do

• Develop pipelines that transform behavioral, demographic, and contextual data into real-time features.
• Design APIs and services for low-latency prediction and decision-making.
• Implement frameworks for A/B testing, bandit algorithms, and model evaluation.
• Collaborate with product and engineering teams to balance engagement, business value, and compliance.
• Build monitoring, logging, and retraining workflows to continuously validate and improve models.

What We Expect

• 5+ years of experience in applied ML engineering (recommendation systems, personalization, ranking, or ads).
• Strong knowledge of Python and/or Go, SQL, and ML frameworks such as TensorFlow or PyTorch.
• Hands-on experience deploying real-time ML systems (low-latency serving, feature stores, event-driven architectures).
• Familiarity with cloud ML platforms (Vertex AI, SageMaker, or similar).
• Experience with data warehouses (BigQuery, Snowflake, Redshift).
• Solid understanding of multi-objective optimization and personalization trade-offs.
• Ability to thrive in a fast-paced, startup-style environment.

➕ Nice to Have

• Experience in martech, adtech, CRM, or large-scale consumer personalization.
• Exposure to bandit algorithms or reinforcement learning.
• Previous work on systems serving millions of users.
• Experience with Google Cloud Platform (GCP).

We Offer

• Opportunity to shape large-scale personalization technology.
• Competitive compensation matching your skills and experience.
• Professional growth budget for conferences and training.
• Fully remote and flexible work setup.
• Collaborative and innovative team culture focused on impact.
• Online & offline team activities.

Schedule: 9am–4pm EST
Format: Full-time / Remote / Worldwide
 

🚀 Join us to build personalization systems that reach millions!
Send your resume or Djinni profile — we’d love to meet you.

About the job Lead ML/AI Engineer

For our client, we are looking for a Senior AI/ML Engineer to join an AI project and drive the design, development, and optimization of cutting-edge retrieval-augmented generation (RAG) solutions.
 

About the Role

This role is ideal for a highly skilled engineer passionate about AI/ML systems, distributed architectures, and vector search technologies. You will play a key role in designing scalable inference stacks, optimizing retrieval pipelines, and integrating modern frameworks into production-grade applications.
 

Requirements

• 5+ years of experience in software engineering, preferably with AI/ML or distributed systems.
• Proven hands-on experience with retrieval-augmented generation (RAG) systems.
• Deep knowledge of OpenSearch, Elasticsearch or similar search engines.
• Strong coding skills in Python.
• Experience with LlamaIndex, LangChain.
• Familiarity with vector databases (Pinecone, Qdrant, FAISS).
• Exposure to LLM fine-tuning, embeddings, semantic search, prompt engineering.
• Background in high-scale systems handling millions of users/queries daily.
• Knowledge of cloud infrastructure (AWS/GCP/Azure) and containerization (Docker, Kubernetes).
• Experience with vector search, embedding pipelines, dense retrieval techniques.
• Strong optimization skills for latency, reliability, and scalability.
• Excellent problem-solving, analytical, and debugging skills.
• Proactive self-starter with ownership mindset.
• Passion for impactful technology aligned with Geniusees mission.
• Bachelors degree in Computer Science or equivalent practical experience.
• English: Upper-Intermediate+.
   

Responsibilities

• Design, build, and scale production-grade inference stacks for RAG-based applications.
• Develop efficient retrieval pipelines with OpenSearch/vector DBs ensuring high recall & relevance.
• Optimize performance and latency for real-time and batch queries.
• Identify and fix bottlenecks to improve system efficiency and response times.
• Ensure observability, monitoring, and reliability of deployed systems.
• Collaborate with teams to integrate LLMs and retrieval components into applications.
• Evaluate and integrate modern RAG frameworks and tools.
• Mentor team members, support architectural decisions, and uphold engineering excellence.
• Contribute to pre-sales activities (NFR elicitation, solution architecture, risk definition).
• Conduct discovery phases and recommend tools/libraries.
• Lead/support code reviews, POCs, and R&D.
• Interview external candidates and provide ad hoc troubleshooting.

What You Will Get

• Competitive compensation & performance-based bonus - 5000 -7000 USD
• Exciting AI startup projects with a modern stack.
• Career development opportunities (regular reviews).
• Professional study support, certifications, and corporate English.
• VIP medical insurance or sports coverage.
• Paid vacation (18 days) and sick leave.
• Flexible working hours (start 8:00 - 11:30).
• Unlimited remote work worldwide + cozy offices in Kyiv & Lviv with Starlink & generator.
• Compensation for coworking (outside Kyiv & Lviv).
• Corporate lunch, team buildings, soft skills clubs.
• Informal and friendly work culture, no micromanagement.
• Own charity fund.

About the job Senior Node.js Engineer

For our client, we are looking for a Senior Node.js Engineer to join a long-term US-based fintech project.
 

The ideal candidate

• 5+ years of relevant IT industry experience, strong knowledge of ECMAScript.
• 4+ years of commercial experience with Node.js.
• Hands-on experience with NestJS.
• Experience working with AWS (Aurora RDS, Serverless, Cognito).
• Experience with NoSQL & PostgreSQL databases.
• Experience with CI automation and test cases.
• English: Upper-intermediate or higher (direct client communication).

Would be a plus:

• Experience with Plaid integration.
• Experience with Google Cloud architecture.
   

 What you will do

• Develop and maintain backend services for a fintech platform.
• Work with AWS services, including serverless infrastructure.
• Implement integrations and optimize existing systems.
• Collaborate closely with the clients team (evening communication required).
• Ensure code quality with automated tests and CI/CD practices.

Important note: This role requires evening communication with the US client (up to 22:00 - 23:00 Kyiv time). Its not every day, but such calls/tasks may occur.
 

What the company offers

• Competitive compensation depending on experience and skills.
• Flexible working hours with remote or office option.
• Long-term, exciting fintech projects with global teams.
• Rate 4000 - 4500 USD.
• English classes and career development opportunities.
• Health/Sports benefits.
• Paid vacation (18 working days) + 10 sick leaves.
• Informal and friendly atmosphere, no bureaucracy or micromanagement.

About the job Principal/Lead Software Engineer (Vue.js)

For our client, we are looking for a Principal / Lead Software Engineer (Vue.js / TypeScript / GraphQL) to join a fast-growing European SaaS company that develops a browser-based video communication platform. Their solution powers webinars, virtual meetings, demos, and online training all directly in the browser, without downloads or installations.
 

About the Role

You'll act as a technical and strategic partner to customers, bridging product capabilities with customer needs. This is a customer-facing, high-impact role that combines technical leadership, pre-sales solution design, and hands-on engineering. You'll collaborate closely with Sales, Product, and Engineering teams to create proof-of-concept implementations, lead technical conversations, and ensure that clients get the most value from the platform.
 

Our Candidate

• 5+ years of experience in Solutions Engineering, Sales Engineering, or a similar technical role
• Proven Tech Lead / Principal Engineer experience
• Strong knowledge of APIs, webhooks, and SaaS integrations
• Expert-level skills in Vue.js and TypeScript
• Strong command of GraphQL and general web technologies (REST, JavaScript, etc.)
• Excellent communication and stakeholder management skills
• Fluency in English

Nice to have:

• Experience working in startup or scale-up SaaS environments
• Familiarity with automation platforms (Zapier, Make, etc.)
• Experience building internal tools or contributing to technical content
   

What You Will Do

• Lead technical discovery sessions with prospects and customers
• Design scalable integration solutions using APIs and webhooks
• Support sales cycles with demos, documentation, and expert insights
• Build prototypes or internal tools to demonstrate platform capabilities
• Collaborate with Product and Engineering to prioritize feature requests
• Provide mentorship and technical leadership to Solutions Engineers and other team members
   

What the Company Offers

• 100% remote work (Europe or Ukraine)
• B2B contract with a competitive rate
• Opportunity to shape the technical direction of a fast-growing SaaS platform
• Work in a collaborative, transparent, and international team
• Freedom to experiment, innovate, and directly impact product growth
   

If you are ready to take on this strategic and impactful role, we look forward to receiving your CV and getting to know you better.

About the job Rust Developer

For our client, we are looking for a Rust Developer to join a powerful and innovative team building cutting-edge blockchain and fintech solutions.The project is for  a Bitcoin payroll and compensation company that enables businesses to reward their employees in Bitcoin. Youll be joining a compact, talented team (2 Developers, 1 Lead Dev, CTO, and CPO) working on a secure, high-performance system that bridges fintech and blockchain technology.

Start: ASAP
Work setup: Remote, with overlap until ~22:00 - 23:00 (Ukraine time) to align with the US time zone.
Employment type: B2B contract️ 

Responsibilities 

• Design and build reliable, secure, and scalable backend solutions in Rust.
• Develop hypermedia-driven web applications (HATEOAS) using HTMX.
• Work with relational databases (Postgres, MySQL, SQLite).
• Implement integrations with Bitcoin wallets, nodes, and the Lightning Network.
• Deploy and maintain applications on Linux servers.
• Utilize AI coding tools to boost efficiency and quality.
• Collaborate closely with the product and design teams to ensure an exceptional user experience. 

 The Ideal Candidate

• 4+ years of experience with Rust web servers (Actix, Axum, or similar).
• Proven experience with relational databases (Postgres, MySQL, SQLite).
• Hands-on experience with the Bitcoin ecosystem (self-custody wallets, nodes, Lightning).
• Strong knowledge of Linux servers and deployment.
• Excellent English communication skills.
• A passion for secure, reliable, and user-focused software.
• Proactive mindset and ownership-driven attitude.

What the Company Offers

• Innovative blockchain & fintech projects with real-world impact.
• A flexible schedule and remote-friendly environment.
• Supportive and transparent work culture with minimal bureaucracy.
• Freedom to experiment with modern technologies and AI tools.
• Paid sick leaves (vacations are self-covered under B2B contract terms). 

Interview Process

1. Intro call with the recruiter
2. Online HackerRank test task
3. Technical call with the client (live coding)

About the job Middle Strong Node.js Developer (EdTech)

For our client, we are looking for a Middle Strong Node.js Developer (EdTech) to join a new project developing an advanced Learning Management System (LMS) from scratch.

About the project: is creating a modular, multi-tenant next-generation LMS designed for corporate and educational clients. The system will combine scalability, analytics, and AI-driven learning features, supporting corporate training, compliance, and onboarding.

The ideal candidate

• Has 4+ years of experience with Node.js and TypeScript.
• Is fluent with NestJS, PostgreSQL, and Redis.
• Has a solid understanding of REST and GraphQL APIs.
• Possesses experience with Docker, Kubernetes, and AWS (CDK, ECS, S3, CloudFront).
• Understands microservices architecture and secure data flows.
• Communicates in English at an intermediate strong or higher level.
• Has a background in EdTech, LMS systems, analytics, or Machine Learning this will make you a top priority candidate.

What you will do

• Develop and maintain scalable backend services using Node.js (TypeScript) and NestJS.
• Build secure, high-performance APIs and integrate them with React frontends.
• Optimize databases and caching strategies (PostgreSQL, Redis).
• Implement authentication/authorization (JWT, Passport.js, OAuth 2.0).
• Collaborate closely with QA, DevOps, and Frontend teams.
• Work with AWS and Google Cloud services (S3, ECS, CloudFront).
• Participate in architectural decisions, sprint planning, and code reviews.

What the company offers

• Competitive salary and compensation package.
• Exciting, stable startup project with a modern stack.
• Corporate English courses and opportunities to work with global clients.
• Professional study compensation (courses, certifications).
• Semi-annual salary review and career development opportunities.
• VIP medical insurance or sports coverage.
• Flexible working hours (start between 8:0011:30).
• 18 paid vacation days + sick leave.
• Remote-first work policy or offices in Kyiv and Lviv (with electricity, Wi-Fi, generators, and Starlink).
• Corporate lunches, team buildings, and charity initiatives.

About the job Senior C++ Developer

For our client, we are looking for a Senior Software Engineer to join the team and contribute to the evolution of the Music Recognition stack!
 

About the Role
As a Senior Software Engineer, you will play a key role in upgrading and enhancing the companys music recognition system a core technology enabling high-performance audio identification. Youll work closely with the Lead Software Engineer on both development and DevOps tasks, ensuring smooth delivery and system scalability.

The Ideal Candidate

• 10+ years of professional experience in software development;
• Strong expertise in C++ (multi-threaded programming) and backend development;
• Proficiency with Linux systems, Python, SQL, Bash, and Jenkins;
• Familiarity with cloud infrastructure and CI/CD workflows is a plus;
• Ability to work independently and collaboratively within a fast-paced environment.

What You Will Do

• Collaborate with the Lead Software Engineer to update and enhance the existing music recognition stack;
• Implement architectural changes to support new business requirements, such as API integrations;
• Contribute to backlog items across development and DevOps;
• Support cross-functional delivery and help eliminate silos between teams.

What the Company Offers

• A collaborative and experienced engineering team;
• A tech-driven environment working on impactful music recognition technology;
• Opportunities to engage in architecture decisions and long-term system evolution;
• Flexible structure with shared responsibilities across dev and infrastructure;
• Remote work on a B2B contract basis (no paid vacation or sick leave).