Senior Java Developer

Context for the Candidates:

Blockchain engineers are tasked with building secure, scalable, and high-performance decentralized applications. This discussion focuses on how to utilize key technologies—Node.js, Rust, Go, TypeScript, Ethers.js, viem, and Hardhat—in smart contract and blockchain system development, while addressing the practical challenges that arise in such projects.

Key Discussion Points:

• How do you integrate Node.js, Rust, Go, and TypeScript in blockchain-backed applications?

• Discuss the trade-offs between using Rust or Go for performance-critical blockchain services.

• What are the key challenges in ensuring the security and scalability of smart contracts using tools like Ethers.js, viem, and Hardhat?

• How do you approach testing, debugging, and deploying smart contracts in a decentralized environment?

• Share best practices for gas optimization, contract upgradability, and backend scalability.

Evaluation Criteria:

1. Technical Knowledge:

• Strong knowledge of Node.js, Rust, Go, and TypeScript with practical experience in blockchain development.

• Proficiency in Ethers.js, viem, Hardhat, and smart contract lifecycle (development, testing, deployment).

• Understanding of security best practices, performance optimizations, and scalability in decentralized systems.

2. Problem-Solving and Integration Skills:

• How candidates approach integrating smart contract solutions with backend services using Node.js, Rust, Go, and TypeScript.

• Solutions proposed for common challenges in blockchain projects such as gas fees, security vulnerabilities, and system bottlenecks.

3. Experience and Expertise:

• Minimum of 2 years of IT experience, including hands-on development with the specified technologies.

• Practical knowledge of blockchain architecture, consensus mechanisms, and decentralized application deployment.

4. Innovation and Critical Thinking:

• Candidates’ ability to think creatively about system architecture, proposing scalable and secure solutions for blockchain-based applications.

• Discussion on the future potential of blockchain technology and how the tech stack can evolve.

5. Communication and Team Collaboration:

• Clear articulation of technical challenges and how to address them in a team setting.

• Ability to lead or contribute to discussions in a way that encourages collaboration and team-driven problem-solving.

Responsibilities

• Build reusable code and libraries for future use.
• Writing reusable, testable, and efficient code
• Own & build new modules/features end-to-end independently.
• Collaborate with other team members and stakeholders.
• Work in an agile environment to rapidly build high-quality and robust features.
• Participate in DevOps.
• Implementation of security and data protection.

Required Skills

• Master in Node.js and frameworks available for it. (Nest.js / Loopback / AdonisJS)
• Excellent understanding of ES6 and OOP.
• Good understanding of SQL & No-SQL Databases. (MySQL / PostgreSQL)
• Understanding the nature of asynchronous programming and its quirks and workarounds.
• Open Source and DevOps enthusiast.
• Comfortable with Test Driven Development.
• Can learn and adapt fast, as well as identify and solve problems.

Bonus Skills

• Hands-on with TypeScript

Job Perks

• Get to work with a highly passionate team of engineers.
• Open and embracing culture towards the latest hot technologies.
• A high level of freedom & responsibility.

Desired Experience

3+ years

Job Description

What You’ll Do

• Design financial systems for scale. Measure, plan, iterate.
• Writing reusable, testable, and efficient code
• Design and implementation of low-latency, high-availability, and performant applications
• Setup and own the engineering architectures built around event sourcing, application sharding, database sharding, service communication mesh, etc.
• The tech: Go, Google Cloud Spanner, Kafka, Redis

What you bring to the table

• 3+ years of experience. Relevant experience is preferred.
• Knowledge of 2 common programming languages - Python & Go / Java & Node / Rust
• Comfortable in linux command line, AWS or GCP
• Strong unit test and debugging skills
• Great communication skills

Bonus if you have…

• Love building great products and engineering systems from scratch
• Are a Self-starter, Hustler and Curious to Learn
• Have an understanding of fundamental design principles behind a scalable application
• Thrive in an early-stage startup environment with less stability and more ambiguity
• Have an interest in financial products and/or cryptocurrency

60 Decibels is a tech-powered impact measurement company that makes it easy to listen to the people who matter most. We've been in business as an independent entity since early 2019, when we spun out of the global Impact Investor Acumen.

We believe that the best way to understand social impact is by talking to the people experiencing that impact. It sounds obvious when you say it, but that is not the typical practice for many impact investors, corporations and foundations working to create social change. 

We collect social impact data directly from beneficiaries (customers / employees / suppliers) using our network of 1000+ trained research assistants in 75+ countries. We do it quickly and without the fuss typically associated with measuring social impact. Our research assistants speak directly to customers to understand their lived experience; and our team turns all this data into benchmarked social performance reports, with accompanying insights, to help our clients demonstrate and improve social performance. 

By making impact measurement simple, scalable, and comparable, we not only enable organizations to improve their products and services; we also help transform what it means to credibly measure impact, ensuring that the voices of those who matter most are always part of the story.

About the role: 

You’ll be an early engineer in a newly formed engineering team. This is a unique opportunity for you to learn, build, demonstrate, and subsequently own diverse components of our tech stack and evolve as we scale our business. As a core engineer in a small team, the role demands a high degree of self-drive and ownership, on a path to achieving outsized impact.

Your Primary Responsibility Will Be:

To Advance Our Integrated Data Capture And Insights Platform (Ruby/React/PostgreSQL) And Associated Tooling (Python)

Specifically, your responsibilities will include:

• Work with a diverse multidisciplinary team across Engineering, Product & Operations, to translate product specs into clean, functional, production-ready code.
• Participate actively in defining of the systems architecture vision to better support our team’s needs
• Grow our technical capacity by mentoring other engineers and interviewing candidates
• Collaborate with team members to identify systems, practices & technologies that suit our needs the best
• Seek, learn, adopt and advocate industry best practices. Contribute towards the engineering culture
• Troubleshooting coding problems quickly and efficiently to ensure a productive workplace

About You: First and foremost, you bring compassion and dedication to this work because it matters to you.

You are a pragmatic and product-driven engineer who is interested in solving user problems and delivering value while taking into account tradeoffs between Business and Tech. You have a bias towards action: you get your hands dirty and actively tackle problems in a way that leads to the best outcomes and brings teams together. You successfully balance flexibility and rigour, using informed judgment to make decisions. You model critical thinking and introspection, taking strategic risks and growing from mistakes. You are decisive and bold, have a growth mindset, are an excellent communicator, and know the value of being a part of an effective team

Minimum Qualification:

• At least 4+ years of experience in software engineering building SaaS platforms, products and APIs
• At least 1+ years in your current role as a senior engineer
• Strong proficiency in Ruby on Rails (primary) and Python (additional)
• Strong proficiency in data modelling, RDBMS (Postgres preferred) and NoSQL databases.
• Proficient in software design, modularity, testability and software quality
• Strong problem-solving and decision-making skills

Additional desired qualifications:

• Preferred prior experience in the following stack: Python, Ruby On Rails, React, Postgres, AWS
• Experience in working on natural language processing, and ML for text and audio.
• Fast self-learner, with aptitude and interest in learn new technologies, languages & frameworks
• Experience working on data-pipelines, and data transformation systems.
• Experience setting up, managing and ensuring best practices on public clouds like AWS, GCP, or Azure (we use AWS)

Working with 60 Decibels

We are a fun, international and highly-motivated team who believes that team members should have the opportunity to expand their skills and career in a supportive environment. We offer a competitive salary, the opportunity to work flexibly and in a fun, supportive working environment. If this sounds like the role for you, get in touch!

60 Decibels is deeply committed to having a workplace that is inclusive and anti-discriminatory. We believe that our team must embody the compassion, listening, and sense of shared humanity that is so central to our goal as an organization. We are proud to be an Equal Opportunity employer and do not discriminate on the basis of race, religion, national origin, gender, sexual orientation age, marital status, veteran status, or disability.

As a growing company, we are building towards a more universally accessible workplace for our employees. At this time, we do use some cloud-based technologies that are not compatible with screen readers and other assistive devices. We would be happy to discuss accessibility at 60 Decibels in greater depth during the recruitment process.

 About our team and our culture: we are a fun and hardworking global team that is full of smart, mission-driven folks who combine an entrepreneurial spirit with a commitment to make a positive change in the world.  

We consistently hear from our clients that the best thing about 60 Decibels is the people. To get a feel for our slightly nerdy, not-take-ourselves-too-seriously vibe, check out our monthly newsletter, The Volume.

Compensation: 60 Decibels offers a competitive salary and benefits package and the opportunity to work in a flexible, fun and supportive environment. The salary range will be adjusted according to costs of living in our country offices. 

Extra Perks: We have an unlimited leave policy and 12 monthly recharge days, on the first Friday of each month. We are a globally distributed team and we give team members opportunities to cross-pollinate and visit our different offices. 

Want to get to know us a little better?

> Sign up to receive The Volume, our monthly collection of things worth reading.

> Visit our website at 60decibels.com.

> Read about our team values here. 

Job Description

• Design & implement backend APIs
• Mentor junior developers technically.
• Actively work to reduce tech debt in the backend
• Work towards more stability & scalability of the backend
• Tech stack - Java, AWS etc. 

Eligibility

• 2-8 years of product company experience
• Advanced understanding of AWS stack
• Prior knowledge of solving problems at scale.

Responsibilities

• Participate in requirements analysis
• Collaborate with internal teams to produce software design and architecture
• Write clean, scalable code using .NET programming languages
• Test and deploy applications and systems
• Revise, update, refactor and debug code
• Improve existing software
• Develop documentation throughout the software development life cycle (SDLC)
• Serve as an expert on applications and provide technical support

Requirements

• Proven experience as a .NET Developer or https://resources.workable.com/application-developer-job-description">Application Developer
• Familiarity with the ASP.NET framework, SQL Server and design/architectural patterns (e.g. Model-View-Controller (MVC))
• Knowledge of at least one of the .NET languages (e.g. C#, Visual Basic .NET) and HTML5/CSS3
• Familiarity with architecture styles/APIs (REST, RPC)
• Understanding of Agile methodologies