Jobs at Djinni

We are seeking a Senior Full-Stack Engineer with strong expertise in React and Node.js to join our team working on innovative e-Ink based products and companion applications. In this role, you will work across frontend, backend, and integration layers, ensuring seamless interaction between an e-ink device, its cloud services, and companion apps (web and mobile).

You will contribute to both new feature development (e.g., analytics, sharing, personalization) and maintenance/stabilization activities (bug fixing, optimization, knowledge transfer). A solid understanding of secure, scalable, and performant web/mobile applications is essential.

Key Responsibilities:

• Develop and maintain web companion applications (React, TypeScript) supporting document sync, sharing, and account management.
• Implement backend services using Node.js (TypeScript) for APIs, synchronization, and user management.
• Contribute to cloud integrations (AWS-based services, Keycloak identity management, REST APIs).
• Ensure secure data handling (encryption, authentication, GDPR compliance).
• Collaborate with mobile engineers to align React Native components with device and cloud integrations.
• Support knowledge transfer activities: documenting flows, APIs, and technical processes.
• Participate in ADR decisions, code reviews, CI/CD pipelines, and quality-first practices.
• Work closely with QA engineers on automation strategy, integration tests, and end-to-end flows.
• Optimize performance for content sync, large files (PDF/EPUB), and offline/online modes.

Required Skills & Experience:

• 5+ years of professional experience in full-stack development.
• Strong proficiency in React (Hooks, Context, Redux or similar state management) and Node.js (TypeScript, Express/NestJS).
• Experience with RESTful API design and integration.
• Hands-on knowledge of secure coding practices (JWT, OAuth2, TLS, input validation).
• Familiarity with MongoDB, SQL, or other database systems.
• Experience with CI/CD pipelines (GitLab, Docker, Kubernetes).
• Solid understanding of Agile practices and working in distributed teams.
• Upper-Intermediate English level.

Nice to Have:

• React Native experience (building cross-platform mobile apps).
• Familiarity with offline-first architectures and sync mechanisms.
• Knowledge of cloud services (AWS, Keycloak, HawkBit).
• Experience with EPUB/PDF libraries, document rendering, or file-sharing platforms.
• Prior work on IoT, embedded, or device-companion ecosystems.

Personal Attributes:

• Strong ownership mindset, able to work across frontend and backend with equal confidence.
• Comfortable collaborating in multi-vendor and multi-technology environments.
• Product-oriented, with a focus on delivering business value and user experience.
• Curious and adaptable — quick to learn new frameworks and approaches.

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

🔹Who we are!

At Levi9, we are passionate about what we do. We love our work and together in a team, we are smarter and stronger. We are looking for skilled team players who make change happen. Are you one of these players?

🔹About the project

Our client is a leading media company in Western Europe, delivering high-quality content across various platforms, including newspapers, magazines, radio, TV, websites, apps, and podcasts. Their brands reach millions of people daily, shaping the media landscape with independent and trusted journalism.
 

🔹About the job

You’ll be working on a personalisation engine that serves all customers of our client, across all media offerings. The customer team is a cross-functional- with data engineers, ML engineers, and data scientists.

🔹Responsibilities

• Maintain and extend our recommendation back-end.
• Support operational excellence through practices like code review and pair programming.

• The entire team is responsible for the operations of our services. This includes actively monitoring different applications and their infrastructure, as well as intervening to solve operational problems whenever they arise.

   

🔹Your key skills:

• analyze and troubleshoot technical issues

• communicate about technical and functional requirements with people outside of the team

   

🔹Required qualifications:

• a positive and constructive mindset and give feedback accordingly
• high standards for the quality of the work you deliver
• a degree in computer science, software engineering, a related field, or relevant prior experience
• 5+ years of software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations experience
• can-do and growth mentality that communicates clearly
• affinity with data analysis
• a natural interest in digital media products

🔹The candidate should have:

• Experience in building microservices in Python and supporting large-scale applications
• Experience building APIs with FastAPI
• Experience in developing applications in a Kubernetes environment
• Developing batch jobs in Apache Spark (pyspark or Scala)
• Developing streaming applications for Apache Kafka in Python (experience with Kafka is a big plus)
• Working with CI/CD pipelines
• Writing Infrastructure as Code with Terraform
• AWS certification at the Associate level or higher, or willingness to obtain it
• Nice to have: machine learning knowledge

🔹9 reasons to join us:

1. Today we're working with the technology of tomorrow.
2. We don't wait for a change. We are the change.
3. We're experts in creating experts (Levi9 academy, Lead9 program for leaders).
4. No micromanagement. We are free birds with a clear understanding of what the high performance is!
5. Learning in Levi9 never stops (unlimited Udemy for business, meetups, English&German courses, Professional trainings).
6. Here you can train your body and mind.
7. We've gathered the best locations - comfortable, cozy and pet-friendly offices in Kyiv (5 minutes from Olimpiyska metro station) and Lviv, with regular offline internal events
8. We have a master's degree in work-life balance.
9. We are actively supporting Ukraine with constant donations and volunteering

🔹Simple step to get this job

Click the APPLY NOW button and leave your contacts!

We are seeking a Senior Kotlin Engineer to join our team and help build and evolve an advanced, global fintech platform. This is an exciting opportunity to work on scalable, event-driven microservices that power financial solutions used by customers around the world.

What You’ll Bring:
- Proven experience in Kotlin back-end development, with a strong focus on microservice-based architectures.
- Expertise in the Spring Framework.
- Practical experience with event-driven messaging systems (e.g., RabbitMQ, Kafka, Axon) and distributed architecture patterns.
- Good understanding of relational database design and optimization.
- Experience with cloud platforms (AWS or GCP).
- Experience with Docker and DevOps practices is highly valued.
- Understanding of Domain-Driven Design is a plus.

We’re looking for an AI Engineer to design, build, and deploy next-gen AI solutions. You’ll lead projects, mentor a small team, and work with cutting-edge tools in ML, deep learning, and generative AI.
 

Responsibilities

• Develop and optimize ML/DL/GenAI models (NLP, content generation, personalization, automation, recommendations).
• Deploy models with MLOps/AIOps, manage cloud platforms (AWS, GCP, Azure).
• Ensure high-quality code, guide team practices, and stay on top of AI trends.

Requirements

• 3–5 years in AI/ML (Python, TensorFlow, PyTorch, Scikit-learn).
• Experience with vector DBs, Docker/Kubernetes, CI/CD, REST API.
• Strong leadership and communication skills.

Will be a plus

• GenAI integration experience.
• Agile (Scrum/Kanban).
• Community contributions.
   

What We Offer

• Flexible remote/hybrid setup.
• Growth & leadership opportunities.
• Training and learning resources.

💡 Apply now and help us shape the future with AI!

About MEGAVAST
MEGAVAST is an international IT company specializing in software development and innovative code development tools that automate and streamline the software creation process. We are now looking for a Finance Manager to join our Kyiv team and oversee all aspects of financial management, accounting, and compliance.

About the Role
Are you a detail-oriented finance professional with strong accounting expertise? Do you thrive in a fast-paced environment and enjoy balancing day-to-day operations with strategic planning? If so, we want to hear from you!

Key Responsibilities:

• Financial Operations: Manage day-to-day transactions, payroll processing, and invoicing.
• Reporting & Forecasting: Prepare Cash Flow forecasts, monthly and quarterly reports (P&L, Balance Sheet).
• Banking: Open and manage bank accounts, negotiate with banks.

• Analysis & Optimization: Identify cost-saving opportunities and improve financial processes.

   

Requirements:

• 2-3 years of experience as a Finance Manager or in a similar role.
• Proven skills in financial management and reporting.
• Experience with bank processes.
• Strong communication skills and high professional integrity.
• Attention to detail and analytical mindset.
• Intermediate English or higher for effective communication with the team.

• In advance: knowledge in stock markets.

   

What We Offer:

• Competitive, stable salary that reflects your expertise.
• Annual salary reviews and performance-based rewards.
• Opportunity to lead change and implement new approaches.
• Paid vacation and sick leave.
• Flexible working hours (workday starts between 9:00–11:00).
• Hybrid work option.
• Modern office in centre of Kyiv, right next to the Olimpiyska metro station.
   

Join MEGAVAST to shape the financial strategy of a growing international tech company while working in an environment that values both professional excellence and personal well-being.

Intetics Inc., a global technology company providing custom software application development, distributed professional teams, software product quality assessment, and «all-things-digital» solutions, is looking for an Incident Editorial Specialist to join our dynamic team.

Join our night shift editorial team in Lviv and Kyiv and work on real-time traffic incident editing for a global mapping platform.

No prior experience required — we provide full training. It’s a great way to start your career in IT and gain experience on international projects.

This is a full-time, remote role. You’ll work with English-language data, applying clear rules and maintaining focus during night shifts.

Requirements:

• B2+ level English proficiency
• High attention to detail
• Confident working with multiple tabs/windows, fast typing

• Basic familiarity with Google Maps, traffic/navigation apps

   

Benefits:

• 8.7-hour fixed night shift, including:
  • 8 paid working hours
  • 40min unpaid break
• Shifts scheduled between 19:00 and 07:00 (exact shift hours depend on assignment)
• 5 shifts per week, including possible weekend rotations
• Paid vacation and official holidays in line with company policy

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

We are looking for a Platform Engineer (DevOps) with solid Azure expertise to join the project of our client, a global leader in the production of spices, seasonings, sauces, and flavorings, with products available in more than 150 countries. In this role, you will design, build, and maintain cloud solutions and automation frameworks that ensure efficient software delivery, platform reliability, and scalability.

You will collaborate closely with Cloud Solutions Architects and Software Developers to enable seamless deployments, observability, and resilience of cloud-native applications.

Responsibilities:

• Build and manage hybrid & multi-cloud infrastructure (Azure, GCP) using Infrastructure-as-Code.
• Develop and maintain CI/CD pipelines, enable GitOps workflows, and embed DevSecOps best practices.
• Deploy and maintain Kubernetes clusters, ensuring scalability, resilience, and security.
• Implement monitoring, logging, disaster recovery, and security baselines.
• Optimize cloud resources for performance and cost efficiency, aligned with FinOps practices.
• Collaborate with architects and developers to enable seamless delivery of cloud-native applications.

Requirements:

• 5+ years in IT (2+ years in DevOps/Platform/Cloud Engineering).
• Strong Azure skills (GCP and multi-cloud experience a plus).
• Proficiency with Kubernetes, microservices, IaC, and automation.
• Experience building CI/CD pipelines and implementing DevSecOps practices.
• Relevant certifications (Azure/GCP/AWS DevOps, CKA, etc.) highly valued.

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

We are looking for an experienced Cloud Solutions Architect to join the project of our client, a global leader in the production of spices, seasonings, sauces, and flavorings, with products available in more than 150 countries, aiming to design, implement, and optimize enterprise-grade cloud solutions. You will play a key role in shaping hybrid and multi-cloud strategies, ensuring security, compliance, and cost optimization, while collaborating with engineers, developers, and business stakeholders.

Responsibilities:

• Cloud Solution Design & Implementation – architect and deliver scalable, secure, and resilient solutions on Azure and GCP.
• Technical Leadership – guide and mentor developers and platform engineers, ensuring best practices in architecture and delivery.
• Security & Compliance – design solutions aligned with compliance frameworks, IAM best practices, and enterprise security standards.
• Hybrid & Multi-Cloud Enablement – leverage Azure and GCP capabilities to support scalable, cost-effective, and high-performance workloads.
• Innovation & Continuous Improvement – explore emerging technologies (AI/ML, data services, serverless, microservices, containerization) and drive ongoing optimization.

Requirements:

• 10+ years in IT, with at least 5+ years in cloud architecture, design, and implementation (enterprise-scale environments).
• Bachelor’s degree in Computer Science, Engineering, or related field (or 5+ years of equivalent experience).
• Strong expertise in Azure & GCP, with hands-on knowledge of IaaS, PaaS, SaaS, and hybrid/multi-cloud architectures.
• Certifications: Microsoft Certified: Azure Solutions Architect Expert and/or Google Professional Cloud Architect.
• Deep understanding of cloud-native services, serverless, microservices, and containerization (Kubernetes, Docker, ECS, AKS, GKE, ARO).
• Experience with AI/ML workloads and data-intensive applications (Azure Synapse, Data Factory, OpenAI; GCP BigQuery, VertexAI).
• Strong knowledge of cloud security, IAM, compliance, monitoring, and cost management.
• Experience running mission-critical workloads in the cloud (e.g., ERP systems).
• Excellent communication and presentation skills – able to translate technical concepts into business impact.
• Leadership skills with experience mentoring technical teams.

QA Madness is a European IT service company focusing strongly on QA and cybersecurity. The company was founded in 2013 and is headquartered in Poland.

Currently, we are searching for an experienced IT Sales Manager for our partner.

Work type: Office/Remote.

Technical level: Middle.

Job category: Sales.

English level: Advanced.

Responsibilities

Inbound & Outbound Focus

• Work with both inbound and outbound sales channels (LinkedIn).
• Monitor and promptly respond to inbound inquiries, ensuring no opportunity is missed.
• Qualify incoming leads using predefined criteria (BANT) to assess fit and prioritize effectively.
• Conduct initial discovery calls/email conversations to understand client needs and determine potential value.
• Schedule and coordinate demo calls with clients to advance the sales process.
• Accurately maintain and regularly update lead information in the CRM system.
• Collaborate with the technical team to develop tailored proposals, estimates, or solutions as needed.
• Consistently follow up with leads to guide them through the sales funnel and maintain timely, relevant communication.
• Track lead progress, analyze conversion metrics, and identify areas for process improvement.
• Accurately maintain and regularly update lead information in the CRM system.
• Share relevant insights and feedback from inbound prospects with your manager, marketing, and tech teams to support alignment and strategy refinement.
• Use LinkedIn Sales Navigator as a strategic outbound channel for prospecting, nurturing, and engagement with the leads based on our ICP.
• Work closely with the lead generation team to plan and execute effective outbound sales campaigns via LinkedIn and email.

Hard skills:

• 2+ years of experience in IT sales or similar roles (account management/ client relations/ delivery manager);
• English level - advanced, C1;
• General understanding of modern technologies;
• Ability to understand project requirements, ask relevant questions and convert answers into structured briefs;
• Excellent organisational and time management skills;
• Responsible and attentive work with CRM.

Soft skills:

• Analytical and logical thinking skills;
• Responsibility, ability to hear and learn from others;
• Strong communication and negotiation skills;
• Ability to build relationships with customers and partners;
• Ability to work independently and as part of a team;
• Ambitions and a huge desire to grow professionally.

What We Offer:

• Competitive salary in USD or EUR and good compensation package (reviews on demand to ensure your compensation reflects your growth and impact);
• Corporate English courses with native speakers;
• Personal time off (20 calendar days of paid vacation, 12 paid sick leaves);
• Health insurance with the broker which is available from the 3 months of cooperation;
• Remote work opportunity;
• Necessary equipment to perform work tasks;
• The ability to focus on your work: a lack of bureaucracy and micromanagement (no tracking tools).

Remuneration:

Wages + Bonus (3-10% monthly)

Please note, that this job is a full-time position, and it is relevant only if you meet all requirements. Any candidate who fails to meet the requirements will not be considered for the job.

*I give consent to the processing of my personal data uploaded via the form under the terms and conditions of QA Madness Privacy Policy (Processing of Candidates Personal Data).

We are seeking a proactive Front-End Developer to join a full-time, short-term project (3-5 months, potentially extending to 6 months or longer).

About the Project:

You will work on a working dashboard prototype, fixing existing issues and connecting the AI-generated prototype to the backend. This is a great opportunity to contribute beyond your scope — analyze the product, propose improvements, and help shape its development.

What We’re Looking For:

• Strong experience with JavaScript (React is a must-have and Vue.js) and TypeScript.
• Experience with shadcn-ui.
• Familiarity with Tailwind CSS is a plus, but not a must-have.
• Experience with Vite.
• Previous experience with .NET is a bonus (future projects may involve .NET).
• Proactive and self-driven: asks questions, proposes ideas, and contributes to product improvement.
• Methodical and organized in your approach to work.
• Strong communication skills in English.
• Ability to attend occasional sync-ups in the evening, your local time (US morning time).

Responsibilities:

• Fix issues in the existing dashboard prototype.
• Connect AI-generated front-end components to the backend.
• Collaborate with the CTO, Head of AI, and Product Manager to improve the product.
• Provide suggestions and implement improvements beyond the initial scope.

Hiring Process:

1. 15-20min prescreen call with the Recruitment Manager.
2. 15-20 min call with the Head of AI.
3. Call with the Product Manager.

Hey there!
 

We are looking for a skilled and self-driven PHP Engineer to join our dynamic team, working on a cutting-edge AI project with real-time monitoring and collaboration features.

As a key team member, you will foster collaboration, drive innovation, and play a pivotal role in advancing both team and company growth.

Required skills:

• 4+ years of experience in back-end development, with a strong focus on PHP
• Proficient in the Laravel framework, with hands-on experience building robust and maintainable applications
• Skilled in working with SQL and NoSQL databases, including expertise in declarative query languages
• Strong problem-solving abilities with a proven track record of writing clean, high-quality, and efficient code
• Experience in developing and deploying scalable, high-availability applications across various environments
• Solid understanding of cloud infrastructure, including deployment strategies and pricing models
• Comfortable working with both relational and non-relational databases in production environments
• Deep understanding of Agile methodologies, particularly Scrum
• Demonstrated success in fast-paced, Agile development teams
• English proficiency at B2 level or higher

Responsibilities:

• Crafting and maintaining modern, responsive web applications using PHP.
• Integrating user-facing elements with server-side logic and functionality.
• Collaborating with front-end developers to integrate user-facing elements with server-side logic.
• Ensuring the performance, quality, and responsiveness of applications.
• Working closely with the product team to define feature specifications and build the next generation of products.
• Leading the development process in an agile environment alongside a world-class team.
• Keeping up-to-date with the latest industry trends and technology updates to continuously innovate the platform.
• Assisting in the prioritization of tasks and development strategies to enhance user satisfaction and business goals.
   

Will be a plus:
 

• Understanding of front-end technologies, such as JavaScript (mainly ReactJS), HTML5, and CSS3
• Experience with SaaS solutions
• Experience with user management platforms
• Experience with payment systems

The stack of the project:

• PHP with Laravel framework
• React.JS (component heavy)
• React Native

We offer:

Interesting, influential projects;
Long-term cooperation with a full-time involvement;
Flexible work schedule and Remote or hybrid cooperation;
Professional development with an individual plan of growth;
Stable salary and planned reviews;
Paid vacation and sick leave (21 vacations and 10 sick days);
Weekends on all public holidays;
Medical insurance package;
Corporate team building including trips;
Professional workshops and training;
Excellent team of dedicated professionals;
Development budget for each employee;
Corporate English;
Strong corporate culture.

Can you write at a native or close-to english level? 

Do you have experience writing copy and studying the greats like Joe Sugarman, Gary Halbert, Eugene Schwartz...

Then this might be the role for you!

We're an affiliate marketing agency looking for a copywriter who wants to learn the art of creating high-converting ads.

You'll be trained on:

1) Spying on competitors
2) Using AI tools

3) Using editors / creative tools
4) Putting together high-converting advertisements

You do not need to have experience with the above. 

You DO need to be close to a native english speaker and have a creative mind. 

BIG help if you have experience editing or doing anything creative (photoshop, canva, using AI image tools, ect.)

Requirements:
 

- 2+ years of experience with TypeScript;
- 1+ years of experience with Nest JS;
- Confident knowledge and practical experience with Prisma ORM;
- Experience in designing and optimizing PostgreSQL databases;
- Experience with Redis (caching, pub/sub, performance optimization);
- Experience with WebSockets (Socket.io).

Will be a plus:

- Experience in Ruby on Rails development;
- Integrations with social media APIs (Facebook, Instagram, Twitter, etc.);
- Knowledge and practical experience with Stripe (subscriptions, payments, webhooks);
- Experience with AWS (S3, Lambda, etc.).

We offer:

- Opportunities to work on diverse and challenging projects;
- A supportive and collaborative team environment;
- 12 vacation days per year;
- 5 sick days per year;
- English classes;
- Access to therapist and psychologist support for mental well-being.

This position is open exclusively for Ukrainian residents within Ukraine (preferably Kyiv or Lviv).

We are looking for an Security Solutions Architect to join our Security Engineering team and work with us on building secure software and solutions for our customers. If you are interested in designing and building security solutions that address complex risks and threats, reviewing and implementing API protocols and subsystems, designing security controls, working hand-in-hand with software developers to build secure systems — this may be the position for you.

Main responsibilities:

• Architect security features, modules and protocols in mission critical software, ensuring alignment with business objectives, functional and non-functional requirements.
• Assess and evaluate the security design of systems, components and their API.
• Search for security weaknesses in software designs from novel fields and areas.
• Perform risk analysis and threat modelling to evaluate available and missing security controls.
• Collaborate with stakeholders, including developers, product managers, and executives, to gather requirements and translate them into security architecture.
• Participate in SSDLC for our products and our customers’ products. Explain architecture choices, work together with developers to select security controls that would improve security without restricting usability/performance.
• Stay up to date with emerging security threats, vulnerabilities, and controls (read articles and papers, follow CVE updates, understand how threat landscape is changing, understand how to apply described ideas, read NIST guidelines).
• Dive into application security, infrastructure security, cloud and on-prem infrastructures, dedicated hardware, IoT security, ML security, and weird stuff beyond casual imagination with our team of skilled engineers. See example of our work.
• Share your work as conference talks, blogposts (see React Native security example, contribute to open source standards like OWASP.

Requirements:

• 2+ years as Solution Architect or similar position.
• Experience designing and implementing security controls in a technically diverse environment.
• Experience in performing design review for multi-component systems (web, cloud, hardware).
• Understanding security standards and methodologies (NIST, ISO, CMMI, SOC).
• Understanding SSDLC and its difficulties. OWASP SSDLC, NIST SSDF.
• Communication skills: you will communicate about security technical topics with both technical and non-technical audiences (C-level managers, developers, product owners).
• An overall understanding of what information security is, how real-world risks and threats affect the choice of security controls. How to combine detective, preventive and corrective controls.
• Experience in popular security tools required for the job, or ability to learn them quickly.
• English level B2+.

Nice to have:

• Understanding risk management and threat modelling (NIST RMF, FAIR, STRIDE, MITRE ATT&CK).
• Understanding of application security verification and software maturity frameworks: OWASP SAMM, OWASP ASVS, OWASP MASVS.
• A certain area of expertise and deep interest: web, cloud, IoT, infrastructure — an area where you have “seen things” and ready to share experience.
• Experience with clouds: AWS, Azure, GCP, understanding the “cloud responsibility gap”.
• Basic knowledge in cryptography: understanding the differences between symmetric and asymmetric cryptography, hashing, KDF.
• Knowledge in one of several business domains: banking / finance / payment processing, cryptocurrencies.
• Practical experience in any programming language.

Hiring process:

• Resume review — up to 5 business days.
• Introductory meeting with the Head of security engineering.
• Test task — estimated time 1-3 hours.
• Technical interview with several team members.
• Offer discussion.

What’s in it for you?

• Competitive compensation with a flexible and clear bonus scheme.
• Paid vacation — 21 business days per calendar year.
• Paid sick leaves.
• Hybrid work model: this position allows for a combination of in-office and remote work as needed.
• Combining technologies: hardware engineering, software engineering, cryptography, information security.
• You will work with people deeply interested in security engineering, you will learn a lot
• Reasonable time budgets and an attitude to build things well — we prioritise building for decades, rather than just until the next release.
• Conferences, books, courses — we encourage learning and sharing with the community. Our team members share a a lot in talks, workshops, and blog posts.
• Public track record in the open-source aspect of our products.

Our company operates at the intersection of blockchain technologies, high-load systems, and next-generation financial instruments. Our products include data indexing, trading automation, and DeFi integrations.

Tech stack: Python, Rust, TypeScript, PostgreSQL, RabbitMQ, Docker, Web3/EVM.

Responsibilities

• Design and develop backend service architecture (Python + Rust): APIs, queues, integrations, on-chain event indexers.
• Build and evolve event-driven architecture: idempotency, exactly-once via transactions and deduplication, outbox/inbox, retries, and DLQ.
• Develop and optimize database schemas (PostgreSQL): indexes, partitioning, JSONB, ACID transactions, query optimization, migrations.
• Integrate with Web3/EVM: read and process events, work with smart contracts, nonce management, reorg/finality handling, signing.
• Develop Subgraph (The Graph): schema design, TypeScript mappings, indexing optimization.
• Work with DeFi protocols: Uniswap V2/V3, AMM/DEX formulas, liquidity, arbitrage, slippage.
• Performance optimization: Python profiling (asyncio, uvloop, GIL), hot-path optimization in Rust.
• Observability and reliability: metrics, traces, logs (Prometheus, Grafana, OpenTelemetry), SLO/SLI, fault tolerance.
• Security: data validation, access control, secure key storage (Vault/KMS/HSM), rate limiting, smart contract audits, fuzz testing.
• CI/CD and infrastructure: GitHub Actions, Docker/Compose, release management, secure deployments; Kubernetes experience is a plus.

• Team leadership: mentoring, code review, task distribution, enforcing engineering practices and quality standards.

   

Requirements

• 5–8+ years of commercial backend development experience.
• 2–3+ years of blockchain/DeFi experience (EVM, on-chain data, smart contracts, integrations).
• 2+ years in a team lead/tech lead role (planning, code review, prioritization, working with business requirements).
• Python: FastAPI/Starlette, asyncio, Pydantic v2, SQLAlchemy 2.x, Alembic.
• Rust: async/tokio, networking, profiling.
• PostgreSQL: advanced schema design, indexes (BTREE/GiST/Gin), partitioning, performance tuning.
• Messaging & events: RabbitMQ/AMQP, delivery guarantees, retries, DLQ, message contract design.
• Blockchain/DeFi: ABI, events, integration with Solidity contracts, Uniswap V2/V3.
• Subgraph (The Graph): schema design, mappings, indexing optimization.
• Infrastructure: Docker/Compose, CI/CD (GitHub Actions), basic networking and container security knowledge.
• Observability: Prometheus, Grafana, OpenTelemetry; experience defining SLO/SLI.

• Soft skills: clear communication, prioritization, mentoring, decision-making.

   

Nice to have

• Production experience in Rust (tokio, async, tracing), profiling and optimization.
• Go experience (CLI utilities).
• Experience building ETL pipelines for on-chain data, DWH (ClickHouse/BigQuery).
• Knowledge of L2 solutions (Optimism, Arbitrum), cross-chain bridges/protocols.
• Work with MEV, mempool, and gas optimization.
• Web3 tools: Foundry, Hardhat, Ethers.js, web3.py.
• DevOps: Kubernetes, Terraform/Ansible, advanced monitoring and alerting.