Senior .NET Core Developer

Senior .NET Core Developer at Pulsetto: own, design, and optimize backend - scale microservices, secure APIs, and tune MySQL with autonomy and real impact.

We are seeking a Senior .NET Core Developer to own, optimize, and scale our backend infrastructure. In this role, you will not be burdened with people management or administrative team-lead duties. Instead, your focus will be purely technical: driving architectural decisions, writing high-performance code, and solving complex engineering bottlenecks.

This position is ideal for a individual contributor who thrives on high autonomy, takes pride in end-to-end technical ownership, and loves building rock-solid, scalable systems in a fast-paced environment.

As our Senior Backend Engineer, you will focus entirely on technical excellence—owning, designing, and optimizing our backend systems without the burden of administrative people management. You will:

• Architect & Scale: Design, develop, and optimize high-throughput, low-latency microservices and applications using .NET Core.
• Build Robust APIs: Create, document, and maintain highly secure RESTful Web APIs capable of supporting scaling global user traffic.
• Optimize Data Layers: Own the performance of our MySQL ecosystem—writing efficient queries, designing schemas, tuning execution plans, and managing data migrations.
• Manage Environments: Containerize applications using Docker and manage local, staging, and production-like environments via Docker Compose.
• Automate Deployments: Maintain, streamline, and improve automated delivery processes through CI/CD pipelines (GitLab, GitHub Actions, or Jenkins).
• Handle Background Workloads: Implement, monitor, and optimize cron jobs, background workers, and scheduled tasks for asynchronous data processing.
• Integrate Systems: Manage high-volume transactional communication, specifically handling push notification integrations via OneSignal.

• 5–7 years of professional experience in backend software development, with at least 4+ years specifically dedicated to intensive .NET Core development.
• Deep production experience with microservices architecture and standard RESTful API design patterns.
• Advanced knowledge of MySQL (or relational databases), including heavy query optimization, indexing strategies, and database scaling.
• DevOps Familiarity: Practical experience with containerization (Docker, Docker Compose) and building automated CI/CD pipelines.
• Education: A Bachelor's degree in Computer Science or a related engineering field is preferred, but equivalent hands-on experience matters more to us.
• You don't need micro-management. You look at a complex backend problem, propose the right technical solution, and drive it to completion.
• Agility & Growth: You adapt quickly to changing insights and love turning data into real engineering action.
• Strong communication skills to clearly explain complex architectural decisions to the team.

Nice to have

• Deep expertise in performance profiling tools for .NET Core (e.g., dotTrace, BenchmarkDotNet).
• Experience with AWS cloud infrastructure (EC2, S3, RDS, Lambda, ECS, or Elastic Beanstalk).
• Hands-on experience with cloud-native relational databases like AWS Aurora or RDS for MySQL.
• Experience managing Infrastructure as Code (IaC) via CloudFormation or Terraform.
• Prior experience working within Agile/Scrum teams.

• Private health insurance after 6 months.
• Hybrid model — 3 days in the Vilnius office or fully remote.
• Work-from-anywhere flexibility: Ability to work from anywhere in the world for up to 40 days per year.
• Opportunity to directly influence brand trust and organic growth at a global scale.
• Collaboration with a world-class team across Europe and the US.
• Office perks — free lunch 3x/week for the Vilnius team.
• Additional vacation days based on tenure.
• Birthday day off.
• Pulsetto device to support your well-being.
• A fast-growing, supportive environment where experimentation is the norm.