Software Development

Heavnn

1-10

Type of role: Hybrid (Sofia/Work From Anywhere)
Seniority: 4-7 years
The Role
Heavnn is a startup building a Global Tax Management platform for online businesses and location-independent professionals.
We’re looking for a Founding Software Engineer who will take ownership of our technical foundations and support the evolutions of our product.
<h2>Tasks</h2>
Build and evolve the product
<ul>
<li>Design, build, and maintain a production-grade software platform</li>
<li>Translate functional and regulatory requirements into clean, maintainable systems</li>
<li>Work closely with tax, legal, and compliance experts to implement domain logic correctly</li>
<li>Improve existing systems through refactoring, simplification, and performance optimization</li>
<li>Build with scalability, reliability, and long-term evolution in mind</li>
<li>Improve and extend existing AI features, staying up to date with advances in AI and modern engineering practices</li>
</ul>
Ensure quality, security, and reliability
<ul>
<li>Apply solid engineering practices around testing, monitoring, and deployments</li>
<li>Contribute to data security and system reliability</li>
<li>Make pragmatic technical decisions balancing speed, quality, and maintainability</li>
</ul>
<h2>Requirements</h2>
Who We’re Looking For
You’re a builder who enjoys ownership and is excited by the evolution of software and AI.
You:
<ul>
<li>Have 4–7+ years of experience in full-stack or backend software engineering</li>
<li>Have shipped and maintained production systems over time</li>
<li>Are curious about AI, automation, and modern development practices, and actively keep yourself up to date</li>
<li>Can translate complex requirements into solid technical implementations</li>
<li>Communicate clearly in written and spoken English (C1/C2)</li>
<li>Are comfortable operating in ambiguity and taking responsibility for outcomes</li>
</ul>
Secret Code: Tianxia (send this code as your cover letter or in your cover letter)
Technical Foundations
To be successful in this role, you should be comfortable with:
<ul>
<li>Modern full-stack web development in a JavaScript / TypeScript ecosystem</li>
<li>Building and maintaining production backend systems (APIs, data models, business logic)</li>
<li>Working across frontend and backend in a product-oriented environment</li>
<li>Integrating and evolving AI-powered features in real-world applications (beyond prototypes)</li>
<li>Reasoning about data, performance, and reliability in distributed systems</li>
</ul>
Nice to Have
<ul>
<li>Experience in regulated or complex domains (fintech, legaltech, taxtech, paytech, etc.)</li>
<li>Experience collaborating closely with non-technical domain experts</li>
<li>Previous experience in an early-stage startup</li>
</ul>
This role is part of our founding roles, learn more here:
<a href="https://builders.heavnn">https://builders.heavnn</a>. io/
Heavnn is also an equal-opportunity company that is committed to inclusion and diversity. We take affirmative action to ensure equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or any other characteristics that make YOU who YOU are.”

Type of role: Hybrid (Sofia/Work From Anywhere)
Seniority: 4-7 years
The Role
Heavnn is a startup building a Global Tax Management platform for online businesses and location-independent professionals.
We’re looking for a Founding Software Engineer who will take ownership of our technical foundations and support the evolutions of our product.
<h2>Tasks</h2>
Build and evolve the product
<ul>
<li>Design, build, and maintain a production-grade software platform</li>
<li>Translate functional and regulatory requirements into clean, maintainable systems</li>
<li>Work closely with tax, legal, and compliance experts to implement domain logic correctly</li>
<li>Improve existing systems through refactoring, simplification, and performance optimization</li>
<li>Build with scalability, reliability, and long-term evolution in mind</li>
<li>Improve and extend existing AI features, staying up to date with advances in AI and modern engineering practices</li>
</ul>
Ensure quality, security, and reliability
<ul>
<li>Apply solid engineering practices around testing, monitoring, and deployments</li>
<li>Contribute to data security and system reliability</li>
<li>Make pragmatic technical decisions balancing speed, quality, and maintainability</li>
</ul>
<h2>Requirements</h2>
Who We’re Looking For
You’re a builder who enjoys ownership and is excited by the evolution of software and AI.
You:
<ul>
<li>Have 4–7+ years of experience in full-stack or backend software engineering</li>
<li>Have shipped and maintained production systems over time</li>
<li>Are curious about AI, automation, and modern development practices, and actively keep yourself up to date</li>
<li>Can translate complex requirements into solid technical implementations</li>
<li>Communicate clearly in written and spoken English (C1/C2)</li>
<li>Are comfortable operating in ambiguity and taking responsibility for outcomes</li>
</ul>
Secret Code: Tianxia (send this code as your cover letter or in your cover letter)
Technical Foundations
To be successful in this role, you should be comfortable with:
<ul>
<li>Modern full-stack web development in a JavaScript / TypeScript ecosystem</li>
<li>Building and maintaining production backend systems (APIs, data models, business logic)</li>
<li>Working across frontend and backend in a product-oriented environment</li>
<li>Integrating and evolving AI-powered features in real-world applications (beyond prototypes)</li>
<li>Reasoning about data, performance, and reliability in distributed systems</li>
</ul>
Nice to Have
<ul>
<li>Experience in regulated or complex domains (fintech, legaltech, taxtech, paytech, etc.)</li>
<li>Experience collaborating closely with non-technical domain experts</li>
<li>Previous experience in an early-stage startup</li>
</ul>
This role is part of our founding roles, learn more here:
<a target="_blank" rel="noopener nofollow" href="https://builders.heavnn">https://builders.heavnn</a>. io/
Heavnn is also an equal-opportunity company that is committed to inclusion and diversity. We take affirmative action to ensure equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or any other characteristics that make YOU who YOU are.”

Founding Software engineer (m/w/n)

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