Cast AI is hiring a Senior Software Engineer focused on database optimization to build greenfield systems for automated query analysis, index recommendations, and performance tuning. The role requires production experience with PostgreSQL and/or MySQL, strong Go and/or C++ skills, and English communication; candidates must reside in one of the listed European countries. Salary is advertised at €6,500–€9,000 gross.

Lead planning and execution of CRM strategies for subscription products, mentor a Senior CRM Executive, apply advanced analytics (segmentation, predictive modelling, behavioural analytics) to reduce churn and optimise campaigns, and collaborate with Marketing, Sales and Product to grow subscription revenue and improve customer experience.

Precision for Medicine seeks a Senior Clinical Research Associate (remote, based in central/southern Serbia) to monitor investigative sites in Bulgaria. The permanent role requires 3+ years of CRA experience, fluency in Serbian, English and Bulgarian, conduct and oversight of clinical studies per protocol, SOPs and ICH-GCP, study start-up activities, up to ~50-60% domestic travel (international travel may be required for some senior roles), and support/mentor junior staff.

Tide is hiring a Senior Python Engineer in Bulgaria to own and maintain backend services within a domain, collaborate with product and cross-functional teams, mentor engineers, and contribute to architecture and Communities of Practice. The role uses Python, Django/FastAPI/Flask, AWS (Lambda, Fargate, EKS, SQS, SNS, SES, S3), Postgres, BigQuery, Terraform and emphasizes microservices, REST APIs and event-driven patterns. Salary range: €51,000–€63,500 per year. Flexible/hybrid working supported.

Tide is hiring a Lead Backend Engineer in Bulgaria to design, build, run and scale microservices in an event-driven architecture. The role uses Java 17, Spring Boot, JOOQ, RESTful APIs, Kafka, SNS/SQS, PostgreSQL (Aurora) and AWS, and involves CI/CD (GitHub Actions), GitOps (ArgoCD), containerisation (Docker/EKS/Kubernetes) and observability with DataDog. The position emphasises ownership of services, deploying to production frequently, and collaborating with Product Owners on product and regulatory requirements. Salary range: €56,800–€71,000 per year.

The role involves calling existing members to build rapport, understand their businesses and upsell products; collaborating with product and other teams to pitch new launches; testing leads/scripts and working on ad hoc projects. Requires previous financial services telesales experience, CRM use (Kustomer or similar), strong English communication, objection handling and target-driven sales skills. Salary range reported: €16,400–€18,400 per year.

Product Sales Executive (Banking & Payments) responsible for outbound calls to existing SME members to build rapport, understand their businesses and upsell relevant banking and payments products. Role involves working with Product Owners and other teams on new launches, testing scripts/leads, meeting team and individual targets, using CRM (Kustomer or similar), and handling KYC and buyer behaviour considerations. English communication skills and prior financial services telesales experience are required. Salary listed €16,400–€18,400.

Tide seeks an Engineering Manager to lead and directly manage a cross-functional team (8–12 engineers) owning backend products and platform services. The role requires 10+ years' experience building server-side applications, hands-on technical leadership, responsibility for delivery, architecture, team performance (DORA), and people development. Tech stack highlights include Python/Java, Spring Boot, microservices, AWS, PostgreSQL, Docker, Terraform, ArgoCD, Kafka and observability with Datadog.

Kraken's Pro team seeks a Senior Software Engineer (Frontend) with 6+ years building web applications using JavaScript/TypeScript and React. Responsibilities include designing, developing, and maintaining React applications (Next.js, WebSockets), influencing technical decisions, mentoring engineers, and working on API design, security, and performance. Experience in payments, crypto, or fintech is preferred; strong English communication skills required.

Senior, hands-on Staff Product Engineer (Ruby on Rails). Remote role owning hard PRs and end-to-end product areas (billing, enterprise auth, API, dashboard, infra), responsible for performance, security, mentoring via code review, and shipping production Rails code. Fluent English and prior Stripe/billing experience required.

SearchApi seeks a senior infrastructure engineer to own and operate its cloud stack and observability for production workloads serving billions of requests. Responsibilities include architecting and operating containerized browser infrastructure, managing AWS services (ECS, EKS, Fargate, RDS, ElastiCache), writing Terraform, tuning autoscaling and networking (websockets, TCP), debugging production issues, and mentoring engineers. Role is remote and expects strong written English, deep AWS and infrastructure-as-code experience, and prior work at scale.

SearchApi seeks a remote Ruby Engineer to build and maintain web-scraping integrations and browser automation (CDP), tackle anti-bot evasion, optimize concurrency, and support production systems at scale. The role involves debugging production issues, reverse engineering protections, contributing across the stack (Ruby on Rails, PostgreSQL, Redis, Sidekiq), customer-facing support, and improving monitoring and infrastructure (Terraform, AWS, Prometheus, Grafana).

Remote role to design and implement greenfield proxy infrastructure: high-performance reverse proxies, IP rotation and session management, IP reputation tracking, geo-targeting and monitoring. Requires deep TCP/UDP and protocol knowledge (HTTP/HTTPS/SOCKS5, HTTP/2/3), Linux networking experience, prior experience building proxy or networking infrastructure, fluent English and a BSc or equivalent technical degree.

SearchApi seeks a remote Anti-Bot Engineer to research and implement anti-bot evasion, reverse engineer detection systems (Cloudflare, Akamai, DataDome, PerimeterX, etc.), optimize Playwright/Puppeteer/CDP configurations, debug TLS/protocol fingerprinting (JA3/JA4, HTTP/2, HTTP/3/QUIC), analyze network traffic, and run headless browsers reliably at scale. Fluent English and deep hands-on experience with browser internals, fingerprinting, network analysis tools, and relevant tooling (Playwright, Puppeteer, Selenium, Wireshark, Burp Suite, mitmproxy) are required.

Sardine is hiring a Senior Data Scientist to design, prototype, and productionize machine learning and graph analytics solutions for fraud and risk use cases. The role involves client-facing problem solving, metrics definition, dashboard automation, collaboration with engineering to scale models, and requires 7+ years of relevant data science or quantitative experience with strong Python/R and SQL skills.

As an experienced SDET II on the Pro team, you will design, build, and own automated testing frameworks for backend APIs and trading workflows, drive CI/CD and automation improvements, review designs and MRs for testability, investigate distributed system failures, and mentor engineers. The role expects strong engineering skills in Python/Rust/C++, deep backend and API testing experience (REST, WebSocket, gRPC, FIX), and experience with containerised CI/CD environments and real-time trading systems.

ClickUp seeks a Senior Database Administrator to administer and maintain PostgreSQL databases (250GB+) on AWS (RDS, Aurora, EC2). Responsibilities include backups and recovery, performance tuning, monitoring, capacity planning, security and access management, migrations, documentation, and participating in on-call rotations. Requires 7+ years' experience, strong PostgreSQL and Linux skills, SQL and scripting (Bash/Python), and familiarity with cloud database deployments.