About Hallo

Hallo offers AI agents for global hiring that evaluate candidates’ soft skills, hard skills, and language proficiency in over 60 languages through 200+ AI-powered interviews, along with additional assessments such as simulations, role-plays, and cognitive tests. We’re on a mission to help organizations hire smarter, faster, and at scale through AI. Learn more at www.hallo.ai. 

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.

Company Culture

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.

Responsibilities

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.

2. Platform Engineering

• Architect and develop back-end services in Node.js with TypeScript 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.

3. Collaboration & Innovation

• 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.

5. Continuous Improvement

• 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.

You’ll thrive in this role if you

• Have 5+ years of professional software engineering experience, including building and scaling SaaS or AI-powered platforms.
• Bring expertise in Node.js (TypeScript) and React (JavaScript), with experience leading complex projects from design through deployment.
• Are proficient with Firebase, AWS, and GitHub 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 cross-functional collaboration, influencing product direction, and translating business needs into technical strategies.
• Have a track record of mentoring engineers, raising engineering standards, and guiding architectural decisions.
• Thrive in fast-paced, high-growth environments, balancing innovation with stability and long-term scalability.
• Are passionate about shaping the future of global hiring with AI, and motivated by building products that make hiring smarter, fairer, and more accessible.

Compensation & Benefits

Hallo takes into account a variety of factors when extending an offer, including the scope and responsibilities of the role, a candidate’s experience, education and training, key skills, internal equity, and market considerations such as location and business needs.

As part of our total rewards package, we provide comprehensive benefits, including health coverage, generous paid time off (PTO), a parental leave program, the flexibility to work from home two days per week, and fully remote options during the summer and winter months.