Jobs Backend

🌍 Location: North & South America (preferred), Poland, Ukraine & Eastern Europe
💼 Employment: Full-time | B2B
📅 Duration: 3+ months, potential extension
💰 Rate: Up to $25/hour
🚀 Seniority: Senior / Staff

About the Project

We are looking for an experienced Senior / Staff Software Engineer to join a product engineering team building a SaaS platform focused on marketing attribution, conversion tracking, and real-time data processing.

The primary focus of this role is to design and build a mobile attribution SDK from scratch, alongside developing real-time conversion APIs, tracking integrations, and scalable data pipelines.

This is a hands-on engineering position for someone who enjoys building production-grade products, designing reusable abstractions, and solving complex integration challenges.

What You'll Do

Mobile Attribution SDK (Greenfield Project)

• Design and develop a new mobile attribution SDK from scratch.
• Build and maintain JavaScript and iOS SDK components.
• Develop reliable tracking, attribution, and event collection mechanisms.
• Design reusable SDK architecture with performance, scalability, and maintainability in mind.
• Ensure seamless integration with client applications and backend services.

Conversion API & Real-Time Tracking

• Build and maintain real-time conversion tracking integrations using Python.
• Process tracking signals and forward conversion events to advertising platforms.
• Develop integrations with third-party advertising APIs, handling platform-specific requirements.
• Work with Google Pub/Sub and Shopify JavaScript tracking.
• Ensure data accuracy, reliability, and efficient event processing.

Data Pipelines & Product Engineering

• Design and optimize production data pipelines supporting SaaS product functionality.
• Build backend services and product integrations.
• Contribute to full-stack application features when needed.
• Participate in architectural decisions and technical design discussions.

Requirements

• 5+ years of commercial software engineering experience, preferably at Senior or Staff level.
• Strong production experience with Python.
• Hands-on experience developing JavaScript SDKs.
• Experience building or maintaining native iOS SDKs (Swift / Objective-C).
• Strong SQL skills and experience working with production databases.
• Solid understanding of SDK architecture, API design, event tracking, and asynchronous processing.
• Experience building customer-facing software products, not only internal tools or dashboards.
• Ability to design scalable engineering abstractions and make architectural decisions.
• Experience integrating third-party APIs.
• Strong problem-solving skills and ability to work independently.
• Fluent English for technical discussions and collaboration.

Nice to Have

• React Native SDK development experience.
• Android SDK development (Kotlin / Java).
• Experience with mobile attribution, mobile analytics, or marketing technology (MarTech).
• Familiarity with attribution platforms, conversion tracking, or advertising APIs.
• Google Cloud Platform (GCP).
• Google Pub/Sub, BigQuery, and Apache Airflow.
• Shopify tracking integrations.
• Experience with streaming architectures and event-driven systems.
• Previous experience building developer tools or SDKs from scratch.

Working Conditions

• Fully remote, full-time engagement.
• Initial project duration of 3+ months, with potential extension.
• Hourly rate up to $25 USD.
• Preference for candidates based in North or South America.
• Candidates from Eastern Europe, especially Poland and Ukraine, are also welcome, provided they can maintain working-hour overlap until approximately 22:00–23:00 local time.

Why Join?

• Build from scratch: Own the architecture and implementation of a new mobile attribution SDK.
• Real product impact: Work on customer-facing SaaS functionality used in production.
• Technical ownership: Influence architecture, SDK design, and integration strategies.
• Modern engineering challenges: Work with real-time data, advertising APIs, event streaming, and cross-platform SDKs.
• Remote collaboration: Join a distributed engineering team with meaningful technical autonomy.

Interested? Apply with your CV and briefly describe your experience developing JavaScript and/or iOS SDKs, especially any SDKs built from scratch.

We're looking for a Senior Backend / Platform Engineer to join an AI-first digital consultancy that helps large enterprises deploy agentic AI solutions across Europe. You'll build the core backend platform and orchestration layer that lets the company's Forward Deployed Engineers ship secure, reliable and reusable AI workflows to customers. If you've taken LLM or agentic features into production and enjoy the hard parts (orchestration, tool calling, state, observability, integrations), this role is for you.

Details: 

• Location: Remote, within Europe (EU-based)
• Employment: Full-time, B2B contract only
• Seniority: Mid-Senior
• Core stack: Python, TypeScript, distributed systems, APIs, queues, databases, OAuth, webhooks, LLMs, agentic AI, observability, data pipelines

What you'll do

• Design and build the backend platform and orchestration layer for agentic AI solutions
• Create scalable, asynchronous, queue-based systems in Python and/or TypeScript
• Implement LLM and agent patterns: tool calling, orchestration, state management
• Build enterprise integrations (OAuth, webhooks, REST APIs, SDKs) and data ingestion/normalisation pipelines
• Set up observability and evaluation for AI workloads: latency, cost, trace capture
• Enable Forward Deployed Engineers to reuse secure, reliable building blocks for customer projects

Must have

• 4–6 years in backend engineering, platform engineering or distributed systems
• Strong hands-on Python and/or TypeScript
• Practical production experience with LLM or agentic applications (tool calling, orchestration, state management)
• Experience with enterprise integrations: OAuth, webhooks, REST APIs, SDKs, data pipelines
• Degree in Computer Science, Software Engineering or a related field
• Based in the EU, available on a B2B basis

Nice to have

• Additional European languages beyond English
• Deep experience with enterprise integrations at scale

Interview process

1. Prepared technical assessment with the engineering team (1 hour)
2. Follow-up discussion (1 hour)

Project - 
​Developing the application for working with laboratory equipment. Work within the client's team, and full participation in the team means high level of responsibility and initiative.

Responsibilities

• Design, develop, and maintain cloud-based using Microsoft .NET and C#.
• Collaborate closely with a multi-disciplinary, international team to deliver high-quality software solutions.
• Ensure adherence to clean code principles and contribute to elegant and pragmatic software designs.
• Participate in all stages of the software development lifecycle, including requirement analysis, architecture design, coding, testing, and deployment.
• Lead or contribute to the implementation of new features, enhancements, and bug fixes.
• Work with Docker, Kubernetes, or similar containerization tools to deploy scalable applications (experience in these technologies is a plus).
• Collaborate in a multi-site setup, ensuring smooth communication and alignment across teams.

Requirements

• Bachelor or Master Degree in Electrical Engineering, Computer Science, or equivalent
• Excellent programming skills in Microsoft .NET / C#.
  Knowledge about Blazor or Javascript is a plus.
• A passion for clean code and pragmatic, elegant design
• At least five years and in best case 10 years plus of professional experience engineering cloud or web solutions.
  Knowledge in Kubernetes, Docker or testing frameworks is a plus.
• Fluent in English to work comfortably in an international environment.
• Quality mindset and at least 3 years of experience in bigger SW development teams (>= 10 people)
• Ideally, experience working in a multi-site teams setup

N-iX is looking for a Senior Scala Engineer to join a long-term cybersecurity product development initiative.
 

As a Senior Scala Engineer, you will become part of a mature cross-functional team developing a large-scale security intelligence platform used by global enterprises to stay ahead of emerging cyber threats. The product helps customers search, analyze, and act on vast amounts of threat intelligence data through modern web and mobile applications.
 

Our team works in a collaborative environment where developers, product managers, designers, and QA engineers partner closely to build reliable, scalable, and user-friendly solutions. You will play a key role in designing and delivering new features, enhancing platform performance, and contributing to a complex, data-driven product used by some of the world's largest organizations.
 

About the Project:

• Long-term cooperation since 2015; development partnership established in 2020
• Project size: ~200 professionals across the USA, Sweden, and Ukraine
• Ukrainian delivery team: 30+ engineers
• Team structure:
  • 2 Scala Engineers
  • 2 React Engineers
  • 1 QA Engineer
  • 1 Team Manager
• Client-side engineering team: 7 engineers
• Agile/Scrum development process
• Direct communication with stakeholders
• No significant time-zone gap
• Cross-functional collaboration with Product, Design, Engineering, and QA teams
   

Why Join This Project?

• Work on a sophisticated cybersecurity product with real business impact
• Join a highly collaborative international engineering environment
• Contribute to the development of large-scale, data-intensive applications
• Be part of a long-term and stable partnership with an established product company
• Take ownership of features from design discussions through implementation and deployment
• Work with modern technologies and distributed systems at scale
   

Responsibilities:

• Design, develop, and deliver new product features for a large-scale web application
• Collaborate closely with product managers, designers, QA, and engineers to create outstanding user experiences
• Develop backend services primarily using Scala, with opportunities to work with Java and TypeScript
• Build and maintain highly available, scalable, and low-latency services
• Participate in architecture discussions and technical decision-making
• Measure, monitor, and continuously improve system performance and user experience
• Ensure high code quality through testing, reviews, and engineering best practices
• Take initiative, proactively identify improvements, and contribute beyond assigned tasks
   

Requirements:

• Strong commercial experience with Scala
• Experience working with MongoDB
• Experience with GraphQL
• Solid understanding of RESTful services and WebSockets
• Willingness to work with both Scala and Java ecosystems
• Strong understanding of software architecture and system design principles
• Good knowledge of data structures and algorithms
• Ability to work across the full development lifecycle, from architecture design to implementation
• Experience collaborating with cross-functional teams
• Excellent communication skills
• Proactive mindset and ownership attitude
   

Nice to Have:

• Commercial experience with Java
• Experience with Elasticsearch
• Experience with RabbitMQ or Kafka
• Additional experience designing and developing REST APIs
• Exposure to frontend development with TypeScript

ZentixSoft is looking for a Senior Python + Data Systems Engineer! 🚀
 

Format: Full-Time Outstaffing, 100% Remote.

Location: North and South America (Priority). We also consider candidates from Eastern Europe (Ukraine, Poland) ready to overlap working hours up to 22:00–23:00 local time (EET/CET).
 

🏛️ Our Approach & Culture at ZentixSoft:

At ZentixSoft, we operate on trust and high autonomy. We have no micromanagement, no invasive time-trackers, and no minute-by-minute monitoring—we value a mature engineering mindset and freedom in decision-making.
 

🧩 Responsibilities:

• Streaming & Event-Driven Architecture: Design, build, and maintain real-time streaming data pipelines and event-driven architectures in Python.
• Conversion API & Integrations: Implement robust API integrations to process tracking signals and transmit them in real time to ad platform APIs.
• Product Data Pipelines: Develop analytical data processing pipelines integrated directly into our commercial SaaS application.
• System Architecture & Ownership: Own backend microservices, data ingestion, database modeling, and technical decision-making from concept to production.
   

🎓 Our Perfect Match (Requirements):

• Seniority & Mindset: Senior or Staff Engineer with a strong product-building mindset and high architectural ownership.
• Backend Stack: Deep commercial expertise in Python and advanced SQL database design.
• Data Systems: Hands-on experience with API integrations and real-time streaming/event-driven systems (e.g., Python streaming, message brokers).
• Schedule Overlap & Communication: Fluent English (Advanced/C1) and readiness to overlap with US time zones (up to 22:00–23:00 local time for EU-based engineers).
   

➕ Nice to Have:

• Hands-on experience with Snowplow or OpenSnowcat.
• Domain expertise in Conversion APIs, marketing analytics, tracking analytics, or e-commerce platforms (e.g., Shopify).
• Practical experience with GCP (Google Pub/Sub, BigQuery) and Apache Airflow.

ProxyScrape is a global proxy provider helping developers and businesses access public web data through reliable proxy infrastructure. 

Building on that foundation, we’ve developed a robust SERP API that scales to 500 requests per second. We’re looking for someone to take technical ownership of this product and spearhead our expansion into new scraping products. 

The role 

You’ll maintain and improve our SERP API, keeping it reliable as search engines and their anti-bot systems evolve. Alongside that, you’ll lead the technical exploration and development of new scrapers, taking ideas from initial experiments through to dependable production services. 

We want someone who enjoys difficult scraping challenges, digs into why something works, developers their own solutions, and persists until the solution holds up at scale. 

You should also be excited about integrating AI into this work: accelerating research, diagnosing failures, developing scrapers, and adapting to website changes. That includes building the tests, monitoring, and review processes needed to ensure those improvements preserve accuracy and reliability. 

What you’ll do 

• Own our SERP API: maintain and improve success rates, response times, scalability, data quality, and cost per successful request. 
• Solve difficult scraping challenges: investigate browser behaviour, fingerprinting, cookies, sessions, JavaScript, and anti-bot systems. 
• Lead new scraping ventures: assess technical feasibility, build prototypes, and turn promising approaches into production products. 
• Experiment systematically: isolate variables, measure outcomes, and turn findings into repeatable improvements. 
• Build AI-assisted workflows: use AI to speed up scraper development, troubleshooting, and maintenance, with clear validation before changes reach production. 
• Protect quality: develop monitoring, regression tests, and data validation that detect both obvious failures and responses that look successful but contain incorrect or incomplete data. Shape our technical approach: make architecture and tooling decisions, document findings, and build reusable foundations for future scrapers. 
• Web-development: Help our team keep user facing dashboard, websites & backends up to date while scrapers require no attention.

What we’re looking for 

• A track record of building and maintaining production web scrapers. 
• Experience solving challenging anti-bot and browser automation problems. 
• Strong knowledge of HTTP, proxies, cookies, sessions, and browser behaviour. Strong programming skills and experience with browser automation tools such as Playwright or Puppeteer. 
• An understanding of concurrency, retries, resource management, and the trade-offs involved in scraping at scale. 
• A practical interest in AI coding tools, agents, and automated workflows, including how to validate their output. 
• The independence to identify problems, propose solutions, and carry them through to a verified result. 
• Experience with PHP (Laravel), Nextjs or similar syntax languages 
• Experience with search engine scraping, SERP APIs, browser fingerprinting, or high-volume scraping infrastructure would be particularly valuable. 

Why this role 

You’ll work with an established proxy infrastructure business and take ownership of a scraping product that already operates at significant scale. You’ll also have a direct role in deciding how we build and maintain the scraping products that come next. 

This is a hands-on engineering role with substantial technical ownership and room to shape the direction of our scraping efforts. 

We are looking for an experienced Founding Engineer / AI-Native Tech Lead to build and scale a gamification platform within the iGaming industry.

This is a hands-on role combining backend development, system architecture, and technical leadership. You’ll take ownership of key technical decisions, build reliable and scalable solutions, and help establish efficient AI-assisted engineering practices.

Responsibilities:

• Design, develop, and scale the backend architecture of a gamification platform.
• Build reliable APIs, real-time features, event-driven systems, and asynchronous workflows.
• Develop and maintain integrations with casino platforms, PAM systems, and third-party services.
• Ensure platform security, performance, scalability, and data consistency.
• Implement AI-assisted development workflows using tools such as Claude Code, Cursor, or Codex.
• Establish engineering best practices, including code reviews, testing, CI/CD, and monitoring.
• Lead and mentor a small engineering team while remaining actively involved in development.
• Collaborate with Product and other teams to turn business requirements into technical solutions.

Requirements:

• 7+ years of commercial software development experience, including technical leadership and SaaS product development.
• Strong backend expertise in TypeScript, Node.js, NestJS, or a comparable stack.
• Solid knowledge of PostgreSQL, Redis, transactions, concurrency, and database optimization.
• Experience with multi-tenant SaaS, event-driven architecture, domain modeling, and state machines.
• Strong understanding of REST APIs, WebSockets, webhooks, JWT/OAuth, and third-party integrations.
• Knowledge of application security, including RBAC, audit logging, OWASP, and rate limiting.
• Experience with Docker, CI/CD, AWS/GCP, and production monitoring.
• Practical experience with AI-assisted development tools and the ability to review and validate AI-generated code.
• Strong problem-solving skills, architectural thinking, and a hands-on approach to technical leadership.

Nice to Have:

• Experience in iGaming, casino platforms, or gamification products.
• Understanding of gaming mechanics, RNG, and PAM integrations.
• Familiarity with React / Next.js.
• Experience building products from scratch in a startup environment.

What We Offer:

• Opportunity to build a gamification product and shape its technical architecture.
• High level of ownership and influence over technical decisions.
• Modern AI-assisted development environment.
• Direct impact on product development and business growth.
• Flexible working environment within a growing iGaming company.

🩵 How We Take Care of Our Team?

Comfortable Conditions for Productive Work
Flexible working hours with a start time between 8:00 AM and 11:00 AM. Work remotely from anywhere in the world or join us in our modern Cyprus office — the choice is yours.

Time to Recharge
We believe great results come from well-rested people. That’s why we offer:
21 days of paid annual leave;
3 additional Day Offs per year;
25 paid sick leave days;
Public holidays as days off.

Benefits & Wellbeing
Sports compensation program;
Annual healthcare budget;
Gifts for important life events (birthday, marriage, childbirth);
Coworking compensation for team members based in Ukraine;
Maternity and paternity leave support;
Business trips and team gatherings at our Cyprus office.

Learning & Career Growth
Annual budget for professional development, certifications, books, and language courses;
Internal mobility and promotion programs to support both vertical and horizontal career growth;
A Personal Development Plan to help you grow your skills and competencies.

Smooth Onboarding & Ongoing Support
We’ve designed a structured onboarding plan to help you quickly understand the business, the team, and your priorities. Regular check-ins with your manager and People Partner ensure a smooth adaptation process and continuous support throughout your journey with us.

Description

We are seeking a Senior Software Engineer to join our Fleet Migration Team. The team develops software tools that automate customer VM movement across data center clusters without service disruption. You will write the automation services and coordination scripts that power our large-scale transition to ARM hardware.

Requirements

Education & experience: Bachelor of Science in Computer Science, Systems Engineering, or a related field, plus heavy experience in systems automation and backend tool development.
Programming Languages: High proficiency in Python and Go, along with Bash scripting.
Virtualization & OS: Good understanding of Linux hypervisors, VM storage snapshots, and state transfer mechanisms.
API & Systems: Experience building CLI tools, REST APIs, and database-backed workflow engines.

Job responsibilities

Build and maintain backend services and CLI scripts to automate customer-driven warm/cold VM migrations.
Implement state tracking, validation checks, and rollback logic for automated migration jobs.
Integrate migration automation with central database state stores and orchestration APIs.
Troubleshoot migration failures and performance bottlenecks during operational test runs.

Insiders is a fast-growing IT company which employs about 200 people. Our company focused on providing innovative digital services and cutting-edge technologies to solve complex business challenges.

We are located in Lviv and currently work in an office format. 

Requirements: Essential:

• Proficiency in .NET Core/Framework, ASP.NET, and ASP.NET Core for web application development.
• Strong knowledge and experience with C# programming language.
• Familiarity with Entity Framework (EF), EF Core, or any other ORM tool.
• Understanding and adherence to software development principles such as DRY, KISS, and YAGNI.
• Solid grasp of Object-Oriented Programming concepts.
• Understanding and application of SOLID principles in software design.
• Strong knowledge and usages of Design (Projecting) patterns.
• Proficiency in SQL for database operations.
• Familiarity with architectural patterns such as MVP, N-layer Architecture, Hexagonal Architecture, etc.
• Experience with version control systems like Git.
• Understanding of Continuous Integration (CI) and Continuous Deployment (CD) principles.
• Familiarity with basic DevOps practices such as automated testing, containerization, and deployment pipelines.
• Basic knowledge of Docker for containerization.

Desirable (Will be a Plus):

• Knowledge or experience with NoSQL databases such as MongoDB or Cassandra.
• Familiarity with front-end technologies like HTML, CSS, JavaScript, and frameworks like React or Angular.
• Experience with cloud platforms such as AWS, Azure, or Google Cloud Platform.
• Experience with automated testing frameworks such as NUnit or xUnit.

Additional Requirements:

• Excellent problem-solving skills and ability to work effectively within a team.
• Strong communication skills to collaborate with colleagues and stakeholders.
• Eagerness to learn new technologies and frameworks.
• Ability to adapt to changing project requirements and priorities.
• Attention to detail and commitment to writing clean, maintainable code.

What we offer:

- free study in our Corporate English Academy

- growth and development opportunities for young developers even if you have no commercial experience

- regular salary review (after the completion of each contract)

- provision of Apple equipment

- comfortable office with all amenities not far from the center (uninterrupted internet, generator, tea and coffee, pastries).

- timely payment of salaries.

- corporate events, teambuildings, etc.

- working on projects side by side with Senior developers, which will give you the opportunity to learn and develop.

About the role
We're building a cybersecurity SaaS product with LLM-powered features. We're looking for a Senior Go engineer on a part-time basis with hourly pay, who will own backend features end to end, from API design to production. We'll share the company name after the intro call.

Format
- Part-time, hourly pay
- Fully remote
- Workload is agreed on the intro call

What you'll do
- Build new features and extend existing functionality, including LLM-based features
- Integrate the platform with third-party services
- Work with AWS infrastructure (EC2, S3 and other services)
- Review the existing codebase, suggest improvements, fix bugs and refactor

First 90 days: onboarding and getting to know the backend code, improvement proposals, bug fixes, refactoring and smaller features.

Tech stack
- Go, Labstack Echo, sqlx
- REST, Swagger / OpenAPI
- PostgreSQL
- AWS: EC2, S3, SES; AWS Bedrock for LLM features
- OpenSearch for observability
- GitHub Actions
- Monolith; background jobs run inside the backend; in-memory caching in Go

Requirements
- 4+ years of commercial backend development, including 3+ years of production experience with Go
- Advanced Go: idiomatic code, concurrency (goroutines, channels, context), error handling, testing and profiling
- Designing and documenting REST APIs (Swagger / OpenAPI) for multi-tenant SaaS, including OAuth 2.0 authorization
- Strong PostgreSQL: schema design, migrations, complex hand-written SQL without an ORM (joins, subqueries, aggregations, window functions, CTEs), query optimization (indexes, EXPLAIN)
- Building fault-tolerant integrations with external services: third-party APIs, webhooks, push/pull
- Hands-on experience with AWS as a developer: EC2, S3, SES
- Observability: logging, metrics, tracing
- Owning a feature end to end: self-review, clear API contracts for the frontend, deploying to the dev environment and testing your work before handing it over
- Secure coding: OWASP API Top 10, secrets management, handling personal data in line with GDPR
- English B1 (Intermediate) or higher

Working with AI
- You use AI daily as an assistant for refactoring, testing and debugging, while writing your own code
- You can critically review AI-generated code for bugs, security issues and design flaws
- You understand how LLMs work: prompting, common failure modes, evaluating output quality
- You've integrated LLMs into Go services: structured output (JSON, tool calling), error and timeout handling, retries, rate limits, cost and latency control

Nice to have
- SSO (OAuth / OIDC), SCIM, Microsoft Graph / Entra ID
- AWS SDK for Go
- Message brokers (RabbitMQ, Kafka)
- Integration testing
- Server-side PDF report generation; i18n in APIs
- Background in cybersecurity; understanding of cryptography (hashing, symmetric and asymmetric encryption)
- Shipping LLM-based features to production
- AI agents and tool calling (including MCP), RAG with embeddings and vector search
- LLM security: prompt injection, data leakage, OWASP Top 10 for LLM Applications

Hiring process
1. Intro call
2. Technical interview
3. Final interview and offer

About us

Farsight Vision converts flight footage into digital 2D and 3D twins for real-time intelligence in GNSS-denied environments, making analytics and situational awareness convenient and accessible while saving time and effort. We create multi-layered digital twins of terrain with dynamic tracking and object/landscape monitoring and predicting.

As a Computer Vision Engineer focused on Visual Place Recognition (VPR), you will own the models and pipelines that answer a critical question in the field: where are we? You will research, train, and ship VPR systems that work under viewpoint change, illumination shift, seasonal variation, and degraded imagery typical of real operations — not only clean academic benchmarks.

If you thrive in startup environments, are proactive, and enjoy turning research into reliable production systems, this role is a chance to shape core localization capability for a defense-tech platform used in live operations.

Responsibilities

• Own Visual Place Recognition end-to-end: problem framing, dataset curation, training, evaluation, and deployment into the FSV Platform.
• Design, train, and iterate on VPR models and retrieval pipelines — global descriptors, local feature matching, and hybrid approaches as the task requires.
• Work with and extend modern VPR / visual localization methods (for example NetVLAD, MixVPR, CosPlace, EigenPlaces, AnyLoc, DINOv2-based descriptors, SuperPoint / SuperGlue / LightGlue-style matching) and know when classical or learning-based methods fit better.
• Build robust training pipelines: data prep, augmentations for domain shift, hard-negative mining, loss design, hyperparameter search, and reproducible experiment tracking.
• Evaluate models beyond top-line recall — failure modes under night, blur, compression, seasonal change, and map–query domain gap; define metrics that matter for field use.
• Package and serve models for production inference (GPU and constrained / edge settings when needed), working with backend and MLOps on versioning, monitoring, and redeployment.
• Collaborate with backend, geospatial, and field teams to integrate VPR into mapping, localization, and digital-twin workflows.
• Use AI coding tools daily, and review, test, and stand behind every line and every model that ships.
• Run small PoCs on new architectures or training recipes, measure them honestly, and bring the team a reasoned recommendation.

Requirements

• 3+ years in computer vision / deep learning for real products or research transferred to production.
• Strong Python and hands-on experience with PyTorch (or equivalent) for training and debugging vision models.
• Proven experience with Visual Place Recognition, visual localization, image retrieval, or closely related geo-localization / SLAM-adjacent perception.
• Ability to train and fine-tune VPR / retrieval models from scratch or from public checkpoints: datasets, losses, mining strategies, and evaluation protocols (e.g. recall@N, precision–recall under realistic splits).
• Working knowledge of modern VPR and matching literature and the judgment to pick methods for viewpoint, appearance, and domain shift — not only recreate paper numbers.
• Experience with large-scale feature indexes / ANN search (FAISS or similar) and practical retrieval system design.
• Solid understanding of CNN and transformer backbones, representation learning, and metric learning.
• Comfort debugging models and data issues that show up in the field (noisy labels, distribution shift, rare failure cases).
• Experience in a fast-paced environment with high ownership and ambiguous requirements.

Nice to have

• Published work or strong open-source contributions in VPR, visual localization, or image retrieval.
• Multi-view geometry, SfM / SLAM, or photogrammetry experience (COLMAP, OpenMVG, etc.).
• Geospatial stack: georeferencing, map alignment, GDAL, orthophotos, point clouds.
• Model optimization for deployment: ONNX, TensorRT, quantization, distillation.
• Video / sequential place recognition, temporal consistency, or map maintenance over time.
• Experience with aerial / drone imagery and GNSS-denied or contested environments.
• CUDA and GPU training at scale.
• Defense tech or dual-use background.

Security Eligibility

Our platform is actively used by the Armed Forces in live operations. As an Estonian-Ukrainian defense technology company handling sensitive operational data, we have a responsibility — legal, ethical, and practical — to ensure the integrity of everyone on our team.

All candidates must be able to confirm the following:

• Neither you nor your close relatives (parents, spouse, siblings, children) reside in Russia, Belarus, or temporarily occupied Ukrainian territories
• You have no regular personal, financial, business, or professional contact with individuals in those territories
• You consent to a deeper security verification if the process advances to later stages

If any of the above criteria are not met, please do not proceed with your application.

Why us

• With us, you will become part of a team of professionals who strive to contribute to the development of advanced technologies.
• We value teamwork and create an atmosphere of mutual support where everyone can unleash their potential.
• Flexible work schedule.
• Paid vacation and sick days.

Hiring process

1. Technical Interview (CV / VPR deep dive + practical discussion of training and evaluation).
2. PM & C-level management Interview.

About the Position

We’re growing fast and looking for a Senior Backend Engineer to join our Engineering team and help build the infrastructure that powers our platform at scale.

This is a high-impact role where you’ll work alongside top-tier engineers, designing and building secure, high-performance systems in a fast-paced environment. If you enjoy solving complex technical challenges and want your work to have real impact — we’d love to meet you.

What We’re Looking For

• Bachelor’s degree in Computer Science or a related field
• 5+ years of experience in backend development
• Strong experience building scalable, production-grade systems
• Proficiency in Node.js
• Experience with SQL and NoSQL databases
• Familiarity with cloud platforms and microservices architecture
• Strong problem-solving skills and attention to detail
• Passion for writing clean, maintainable, and efficient code

Bonus Points For

• Experience in cybersecurity or building security-focused products
• Experience working in startup or high-growth environments
• Familiarity with DevSecOps / SDLC tools
• Experience with distributed systems and high-scale data processing

Please provide your CV and LinkedIn profile. We demand your LinkedIn profile with actual working experience to move forward with your application!

Fundomate is looking for a Senior Java Back-End Developer to join our team. Fundomate is an innovative fintech company operating in the alternative lending space and providing both direct-to-business and white-label turnkey solutions.

You will be good match if:

- You have history of solving non trivial problems in one of your previous projects

- You have wide technology background (backend, frontend, devops, ops, mobile development, etc), so you will understand the connections between technologies and expand this knowledge with domain and business needs. 

- You have experience working in US fintech domain 

We will be good match if:

- You want to solve (or learn to solve) complex business problems

- You want to experiment with processes/development technics/tools

- You are interested in continuous improvement and automation of product and working process

Requirements:

- 6+ years of experience developing web applications

- 3+ years of experience in any IoC & DI framework (Spring, Quarkus, Micronaut, etc.)

- TDD experience in production is a must have

- Experienced in pair programming

- Good knowledge of MicroServices (Kubernetes knowledge is a plus)

- Experience working with tools like Git, Gradle, Jenkins or similar CI/CD

- Working experience in Industry Standard protocols related API Security including OAuth (KeyCloak is a plus)

- Working experience with RDBMs like Postgres/MySQL or any similar

- Understanding of asynchronous message-based communication like Kafka, GCP Pub/Sub, AWS SNS/SQS, etc. (Kafka as an advantage)

- Strong Agile/Scrum/Kanban development experience

- Experience in third party systems integration (XML or JSON api)

- Knowledge of any cloud provider (AWS as an advantage)

Our technical Stack:

- Java 25

- Microservices (Quarkus)

- Postgresql/MySQL

- Kafka

- Keycloak

- Kubernetes & Docker

- AWS (EKS, MSK, RDS, etc.)

- Gradle

- Bitbucket pipelines, gitops approach

- Lombok, MapStruct, Flyway

We offer:

- Innovative product with modern technology stack

- Competitive salary (paid in $)

- Social package (paid vacations, sick leaves and etc)

- PE accounting and support

- WFH and remote working mode possibility, Ukrainian working hours

- No bureaucracy, micromanagement and time-tracking

Phoenix Games is an innovative technology company building next-generation iGaming and Web3 products for a global audience. We create scalable gaming platforms powered by AI, blockchain, cloud technologies, and modern backend architectures.

We're expanding our engineering team and are looking for Middle and Senior Java Developers who are passionate about building high-performance backend systems and solving complex technical challenges in a fast-growing product environment.

What You'll Do

• Develop and maintain scalable backend services using Java and Spring Boot.
• Design and implement RESTful APIs and microservices.
• Build reliable, secure, and high-performance applications.
• Collaborate with Front-end Developers, QA Engineers, Product Managers, and DevOps teams.
• Optimize application performance and database queries.
• Participate in architecture discussions and technical planning.
• Write clean, maintainable, and well-tested code.
• Participate in code reviews and continuously improve engineering practices.
• Contribute to CI/CD processes and cloud-based deployments.

Tech Stack

• Java 17/21
• Spring Boot
• Spring Cloud
• Hibernate / JPA
• PostgreSQL / MySQL
• Redis
• Kafka / RabbitMQ
• Docker
• Kubernetes
• AWS
• Git
• GitHub Actions
• REST APIs
• Microservices

Requirements

Middle

• 3+ years of commercial Java development experience.
• Strong knowledge of Java and Spring Boot.
• Experience building REST APIs.
• Experience with SQL databases (PostgreSQL or MySQL).
• Understanding of OOP, design patterns, and clean code principles.
• Experience with Git.
• Upper-Intermediate English or higher.

Senior

• 5+ years of commercial Java development experience.
• Strong experience with Spring Boot and microservices architecture.
• Experience designing scalable and high-load backend systems.
• Strong knowledge of PostgreSQL or MySQL.
• Experience with Docker and Kubernetes.
• Experience with cloud platforms (AWS preferred).
• Experience mentoring developers and participating in architectural decisions.
• Strong understanding of performance optimization and distributed systems.
• Upper-Intermediate English or higher.

Nice to Have

• Knowledge of Kafka, RabbitMQ, or event-driven architecture.
• Experience with Redis and caching strategies.
• Familiarity with Web3 or blockchain technologies.
• Experience with CI/CD pipelines.
• Understanding of security best practices for backend systems.

What We Offer

• Fully remote work from anywhere in Europe.
• Long-term B2B cooperation.
• Competitive salary paid in EUR or USD.
• Annual salary reviews.
• Performance-based bonus program.
• Annual company bonus.
• 25 paid vacation days.
• Paid sick leave.
• Flexible working hours.
• Home office budget.
• Laptop or equipment allowance.
• Learning & development budget for courses, certifications, books, and conferences.
• English language lessons.
• Private health insurance.
• Mental health support program.
• Sports and wellness compensation.
• Team-building activities and international company retreats.
• Opportunity to work on cutting-edge AI, Web3, and cloud-based products.
• Career growth in a fast-growing international product company with a strong engineering culture.

Why Join Phoenix Games?

At Phoenix Games, you'll work with modern technologies, contribute to products used by a global audience, and have the opportunity to grow alongside an experienced international engineering team. Whether you're an ambitious Middle Developer looking to take the next step or a Senior Engineer ready to shape technical decisions, you'll find exciting challenges and real ownership here.

Requirements:

• Strong production experience with Python and SQL.
• Experience developing JavaScript SDKs and iOS SDKs, ideally covering both.
• Ability to design and build a mobile attribution SDK from scratch.
• Experience building products, designing reusable abstractions, and making architecture decisions.
• Fluent English.
• Nice to have: React Native, Android SDKs, mobile attribution, mobile analytics, or GCP.

We offer:

• Attractive financial package

• Challenging projects

• Professional & career growth

• Great atmosphere in a friendly small team

• Flexible working hours