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Job Description - JD

Position: Back-end Developer

Level: Senior

1. Key Responsibilities

Development & Maintenance

• Architect, design, and implement complex server-side logic and APIs to support front-end applications, third-party integrations, and internal systems;
• Lead the development and maintenance of highly scalable, secure, and fault-tolerant systems using advanced back-end technologies;
• Optimize application performance, scalability, and reliability through advanced server-side programming, caching strategies, and load balancing;
• Drive the adoption of best practices in code quality, maintainability, and performance optimization;
• Design and implement microservices-based architectures, ensuring modularity, scalability, and fault isolation across distributed systems.

Database Management

• Design and optimize complex database schemas for relational and NoSQL databases, ensuring data integrity, scalability, and high availability;
• Implement advanced database optimizations, including indexing strategies, query optimization, sharding, and replication;
• Oversee database operations such as migrations, backups, and disaster recovery planning;
• Manage and integrate databases like MySQL, PostgreSQL, MongoDB, DynamoDB, or Redis in high-traffic environments.

System Integration & API Development

• Architect and develop robust, scalable RESTful and/or GraphQL APIs, ensuring high performance, security, and backward compatibility;
• Lead integration efforts with third-party services, SDKs, and APIs (e.g., payment gateways, CRMs, analytics platforms), ensuring seamless interoperability and fault tolerance;
• Establish API governance, including versioning, documentation, and monitoring, to ensure long-term maintainability;
• Implement advanced security measures, such as rate limiting, API key management, and protection against common vulnerabilities (e.g., OWASP Top 10);
• Design and integrate with third-party applications, ensuring secure data exchange, API compatibility, and error handling for external systems.

Security

• Implement and enforce security best practices across all back-end systems, including secure coding, data encryption, and protection against threats like SQL injection, XSS, and CSRF;
• Design and manage secure authentication and authorization workflows using protocols like OAuth 2.0, OpenID Connect, and JWT;
• Conduct regular security audits, vulnerability assessments, and penetration testing to ensure system integrity;

Testing & Debugging

• Design and implement comprehensive testing strategies, including unit, integration, stress, and chaos testing, to ensure system reliability;
• Lead debugging efforts for complex, production-level issues, utilizing observability tools like logging, metrics, and tracing;
• Champion test-driven development (TDD) and behavior-driven development (BDD) practices within the team.

Collaboration

• Mentor and guide junior and mid-level developers, fostering a culture of technical excellence and knowledge sharing;
• Collaborate with cross-functional teams, including front-end developers, DevOps, and product managers, to deliver cohesive solutions;
• Lead architectural discussions and technical decision-making in Agile/Scrum environments, contributing to sprint planning, code reviews, and retrospectives.

1. Qualifications

Education & Experience

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field (or equivalent work experience);
• 5+ years of professional experience in back-end development, with at least 4 years leading complex, production-grade microservices-based systems;
• Demonstrable portfolio showcasing scalable microservices architectures, secure systems, and integrations with third-party applications (e.g., payment gateways, SaaS platforms, or enterprise tools).

Technical Skills

• Proficiency in at least one back-end programming language, Golang preferred (e.g., Python, Java, Node.js, Ruby, Go, PHP);
• Deep expertise with modern frameworks such as Gin, Echo, … with experience optimizing framework performance;
• Strong understanding of database management systems (SQL and NoSQL);
• Familiarity with containerization and orchestration tools like Docker and Kubernetes;
• Extensive experience with microservices architecture;
• Proficiency in integrating with third-party applications and APIs, with experience in managing OAuth, webhooks, and asynchronous integrations.
• Experience with message queues like RabbitMQ, Kafka, or Redis.
• Hands-on experience with CI/CD pipelines, Infrastructure as Code (e.g. CloudFormation), and DevOps practices using tools like Jenkins, GitLab CI.
• Familiarity with observability tools (e.g., Prometheus, Grafana, ELK Stack, OpenTelemetry) for monitoring, logging, and tracing in distributed systems.

Preferred Skills

• Experience leading the design and implementation of serverless architectures and Function-as-a-Service (FaaS) platforms;
• Proficiency in designing and securing gRPC-based APIs and protocol buffers for high-performance, low-latency systems
• Knowledge of advanced caching strategies (e.g., Redis, Memcached, Varnish) and content delivery networks (CDNs)

Soft Skills

• Exceptional problem-solving and analytical skills, with a focus on optimizing for performance, security, and scalability in distributed systems;
• Strong leadership and mentorship abilities, with a proven track record of guiding technical teams and fostering collaboration;
• Excellent communication skills, capable of articulating complex technical concepts to non-technical stakeholders and presenting strategic recommendations.
• Proven ability to manage multiple high-priority projects in a fast-paced environment while meeting deadlines and quality standards.

1. Benefits

• Performance-based salary and bonus – your growth is recognized and rewarded;
• Join a young, dynamic team working with the latest tech trends: Blockchain, Metaverse, AI, Machine Learning;
• A friendly and inclusive culture blending Vietnamese warmth with Silicon Valley professionalism;
• Be mentored by tech leaders with global experience at companies like Google, Microsoft, Apple, Cisco;
• 12 paid leave days + 12 WFH days annually, with flexible hybrid work options;
• Monthly knowledge-sharing sessions, technical workshops, and team-wide learning culture;
• Regular team building, bonding activities, and internal events to stay inspired;
• Social & unemployment insurance fully covered in compliance with local laws.

Ready to take the next step in your career? Apply now and be part of our innovative team at Phygital Labs! Send your CV now to join Phygital Labs!

To apply: send CV to [email protected]

For more details: https://phygitallabs.io/careers