Senior Software Engineer

Job Description

As a Senior Software Engineer at Hallo, you will take a leading role in building AI agents that transform global hiring. You will help shape and scale the world’s best all-in-one platform for AI interviews, AI-powered assessments, and intelligent agents that drive messaging, skill evaluation, sourcing, interviewing, and hiring.

This role goes beyond coding – you’ll design and architect scalable, secure, and high-performing systems that power AI-driven hiring experiences worldwide. You’ll also mentor engineers, set engineering best practices, and influence technical decisions that shape the future of our platform.

Senior Software Engineers at Hallo are innovators and problem-solvers. You’ll collaborate with Product, AI/ML, and Customer Success to deliver solutions that are not only technically robust but also impactful for enterprises and job seekers globally. By joining us, you’ll directly shape the future of AI in talent acquisition and enable organizations to hire better, faster, and smarter.

At Hallo, our culture is shaped by six core values:

• Speed:
  We move fast, stay agile, and focus on execution.
• Trust:
  We collaborate on a foundation of trust, grounded in skill and integrity.
• Ownership:
  We take initiative, act with accountability, and deliver results.
• Kindness:
  We treat others with empathy, respect, and friendliness.
• Excellence:
  We strive for the highest standards and continuous improvement.
• Dream Big:
  We embrace bold ideas and push boundaries to shape the future.

Together, these values spell STOKED, capturing the energy, ambition, and excitement that define how we work.

1. AI Agent Development

Lead the design, development, and scaling of AI agents for interviews, assessments, messaging, and candidate sourcing.

Drive integration of advanced AI capabilities (ChatGPT and Gemini) into production systems with a focus on reliability and enterprise readiness.

Define standards for adaptive assessment experiences (e.g., CEFR-aligned language testing, cognitive and skill evaluations) and ensure technical excellence in delivery.

Architect and develop back-end services in Node.js with Type Script and front-end interfaces in React and Reactstrap, ensuring maintainability and long-term scalability.

Oversee the use of Firebase services (authentication, database, image storage) and AWS hosting infrastructure to optimize performance and cost-efficiency.

Champion engineering best practices, code quality, and performance optimization across the team.

Serve as a technical leader, collaborating closely with Product, AI/ML, and Customer Success teams to shape requirements into impactful solutions.

Guide architectural decisions, contribute to long-term technical strategy, and influence the product roadmap.

Lead design and code reviews, ensuring engineering standards are met while mentoring peers and junior engineers.

4. Quality & Security

Own the implementation of compliance and security best practices aligned with SOC 2, ISO 27001, GDPR, and the EU AI Act.

Establish frameworks for monitoring, testing, and debugging to ensure reliability at enterprise scale.

Promote a culture of engineering discipline, resilience, and accountability across the team.

Stay ahead of industry trends by evaluating and adopting emerging frameworks, libraries, and AI tools.

Lead initiatives to improve developer efficiency, scalability, and automation across engineering workflows.

Act as a mentor and role model, fostering collaboration, innovation, and continuous learning within the team.

• Have 5+ years of professional software engineering experience, including building and scaling SaaS or AI-powered platforms.
• Are proficient with Firebase, AWS, and Git Hub workflows, and can optimize infrastructure for performance, scalability, and cost efficiency.
• Have hands‑on experience with AI/ML APIs or frameworks and know how to apply LLMs, speech recognition, TTS, and avatar technologies in real‑world production systems.
• Demonstrate strong knowledge of secure, compliant system design, with prior exposure to enterprise SaaS or regulated industries (SOC 2, ISO 27001, GDPR, EU AI Act).
• Excel at…