Question Summary:
My question is about whether it is permissible to work for a financial institution’s IT (Information Technology) department. I work as a team to support the systems that run financial applications similar to a bank

Question Detail:

My question is about whether it is permissible to work for a financial institution's IT (Information Technology) department.  I work as a team to support the systems that run financial applications similar to a bank although the company I work for is not a bank.  Transactions do involve interest.  I personally do not have to write/print any documents regarding the transaction and never have to deal with the customer.  In other words, the transaction is completely invisible to me.  My responsibility is to keep the systems up and running.

I read Fatwa # 5178 which stated that it is OK to work in the I.T. Dept. of a bank.  I am really interested to find out if the same is true for working in a non-bank financial institution.

Answer :

In the name of Allah, Most Gracious, Most Merciful
Assalaamu `alaykum waRahmatullahi Wabarakatuh
If your employment involves working with any systems which are directly related to anything impermissible then this employment will also be impermissible. For example, a person is employment to maintain interest calculating programmes, then this will not be permissible (makrooh tahreemi).(Sabab Qareeb Ghayr Mutaharrik)
However, if the employment is not involved directly with anything impermissible, then it will be makrooh tanzeehi to do such a job. For example, a person’s occupation is to take care that the computers are up and running for such a company which deals with interest, then this will makrooh tanzeehi as this indirectly grants the company the ability to continue their impermissible transactions.(Sabab Ba’eed)
Kindly find below to detailed fatwas on the issue.
 
And Allah knows best
Wassalamu Alaikum
Ml. Ishaq E. Moosa,
Student Darul Iftaa
Checked and Approved by:
Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah

 
The measure of Assisting in Sin
 
In the past, it was very easy to determine a Shari’ ruling on إعانة على المعصية (asssisting in sin). In today’s times of technological advancements and calculations, the issue of assisting in sin has become very complex. The interdependence of various departments of their technological world cannot be denied. Some departments are directly related to sin, whilst others are indirectly related. In terms of Shari’ah, where do we draw the line and how do we practice on the injunction of ولا تعاونوا على الإثم والعدوان (And do not help each other in sin and aggression)?
 
The following article is prepared by Moulana Jawed (Sallamahu), a student of the Darul Ifta. Moulana very aptly first explains the fundamental principles and then the practical implementations of the rules. This article will be very useful for Ulama. As for the masses, we advice that this article should not be regarded as a standard for all issues not contained in this article. Such issues should be presented to a competent Mufti for a Shari’ ruling. May Allah accept the efforts of Moulana Jawed (Sallamahu) and take him from strength to strength in serving the Ulama with the various great skills and capabilities Allah has granted him. Aameen.
 
Mufti Ebrahim Desai
 
Introduction
 
One of the most frequently asked questions amongst Muslims today is regarding working in banks and financial institutions that deal with interest. Severe warnings have been mentioned in The Holy Quran and the Ahadith of Nabi (Sallallahu 'Alaihi Wasallam) regarding those involved in interest. Similarly, Shari’ah has also forbidden Muslims from engaging in those actions that assist in sin. However, a general ruling cannot be made that all employments that are connected to interest in any way or assist in any kind of sin are impermissible; hence, there are certain rules and guidelines that distinguish those that are permissible from those that are impermissible. It is important to understand these rules and guidelines before determining a ruling regarding any such employment.
 
Involvement in interest
 
Severe warnings have been mentioned in the Holy Quran regarding those involved in interest and usury. Allah Ta’ala mentions in the Holy Quran:
 
الذين يأكلون الربا لا يقومون إلا كما يقوم الذي يتخبطه الشيطان من المس ذلك بأنهم قالوا إنما البيع مثل الربا وأحل الله البيع وحرم الربا.
Those who take ribā (usury or interest) will not stand but as stands the one whom the demon has driven crazy by his touch. That is because they have said: “Sale is but like ribā”, while Allah has permitted sale, and prohibited ribā. (Verse: 2:275)
 
يا أيها الذين آمنوا اتقوا الله وذروا ما بقي من الربا إن كنتم مؤمنين. فإن لم تفعلوا فأذنوا بحرب من الله ورسوله وإن تبتم فلكم رءوس أموالكم لا تظلمون ولا تظلمون.
O you who believe, fear Allah and give up what still remains of ribā, if you are believers. But if you do not (give it up), then listen to the declaration of war from Allah and His Messenger. However, If you repent, yours is your principal. Neither wrong, nor be wronged. (Verse: 2:278,279)
 
Moreover, Nabi (Sallahu ‘Alaihi Wasallam) has not only forbidden Muslims from giving and taking interest, but also forbidden them from writing down the transaction of interest and witnessing it.
 
عن جابر قال لعن رسول الله صلى الله عليه وسلم آكل الربا وموكله وكاتبه وشاهديه وقال هم سواء. (رواه مسلم)
Hazrath Jabir (Radhiyallahu Anhu) narrates that Nabi (Sallahu ‘Alaihi Wasallam) cursed those who are involved in usury; whether it is the person who is giving usury, receiving it, writing the transaction or witnessing it.
(Sahih Muslim Vol.11 Pg.28 – Dar al-Ma’rifah)

The commentators of Hadith explain that whilst the abovementioned narration explicitly forbids one from writing the transactions of interest, it refers only to those people who write an agreement and prepare the document to evidence the transaction of interest. It does not include those people or accountants who record these transactions later and were not involved in the transaction itself.
 
وهذا إنما يقع على من واطأ صاحب الربا عليه فأما من كتبه أو شهد القصة ليشهد بها على ما هي عليه ليعمل فيها بالحق فهذا جميل القصد لا يدخل في الوعيد المذكور وإنما يدخل فيه من أعان صاحب الربا بكتابته وشهادته
(Fath al-Bari (Ibn Hajr) Vol.4 Pg.394 – Qadeemi Kutub Khana)
 
(Contemporary Fatawa (Mufti Taqi Usmani) Pg.160 – Idara-e-Islamiyat)
 
Therefore, it will not be permissible for a Muslim to take up a job that is directly involved in interest; whether it involves carrying out interest bearing deals or preparing documents for interest bearing transactions; e.g. working as a manager, cashier, clerk, etc. in a bank, insurance company, etc. The wages acquired through such an occupation will not be permissible. However, an accountant or auditor who records these interest bearing transactions as an event that has already happened, and is not directly involved in these transactions, does not directly fall within the ambit of the warning of the abovementioned Hadith. Such an occupation may fall under the category of assisting in sin or being a means for a sin being committed as explained below.
 
Assisting in sin
 
The issue of assisting in haram and being a means for a sin being committed has been discussed amongst the scholars of Islam. The following Verses of the Holy Quran and the Ahadith of Nabi (Sallallahu ‘Alaihi Wasallam) indicate that it is not permissible to assist in sin or to be a means for a sin being committed:
 
Allah Ta’ala mentions in the Holy Quran:
 
ولا تعاونوا على الإثم والعدوان
And do not help each other in sin and aggression. (Verse: 5:2)
 
قال رب بما أنعمت علي فلن أكون ظهيرا للمجرمين
He (Mūsā) said, “O my Lord! As You have favored me, I will never be a supporter of the sinners”. (Verse: 28:17)
 
ولا تسبوا الذين يدعون من دون الله فيسبوا الله عدوا بغير علم
Do not revile those whom they invoke other than Allah, lest they should revile Allah in transgression without having knowledge. (Verse: 6:108)
 
ولا يضربن بأرجلهن ليعلم ما يخفين من زينتهن
And let them not stamp their feet in a way that the adornment they conceal is known. (Verse: 24:31)
 
فلا تخضعن بالقول فيطمع الذي في قلبه مرض
So, do not be too soft in your speech, lest someone having disease in his heart should develop fancies (about you). (Verse: 33:32)
 
It has been mentioned in the Ahadith of Nabi (Sallallahu ‘Alaihi Wasallam):
 
عن عبدالله ابن عمرو بن العاص أن رسول الله صلى الله عليه و سلم قال: من الكبائر شتم الرجل والديه قالوا يا رسول الله وهل يشتم الرجل والديه ؟ قال نعم يسب أبا الرجل فيسب أباه ويسب أمه فيسب أمه (رواه مسلم)
It has been narrated on the authority of Abdullah bin ‘Amr (Radhiyallahu ‘Anhu) that Nabi (Sallallahu ‘Alaihi Waallam) said, “It is amongst the major sins for a person to use abusive language in regards to his parents”. The Sahabah (Radhiyallahu ‘Anhum) asked, “O’ Messenger of Allah, will any person use abusive words in regards to his own parents?” Nabi (Sallallahu ‘Alaihi Wasallam) answered, “Yes, one abuses another’s father and the other abuses his father in return. One abuses another’s mother and the other abuses his mother in return”.
(Sahih Muslim Vol.2 Pg.274 – Dar al- Ma’rifah)
 
However, a general ruling cannot be made that all actions which are a means for a sin to be committed are impermissible, as many actions in today’s times act as a means for a sin being committed. For example, growing of crops could be a means of nourishing a non-Muslim who will engage in impermissible acts.
Moreover, the scholars of the past have differed in giving rulings regarding those actions that act as a means for a sin being committed. At times, a scholar has ruled an action impermissible on the basis of assisting in sin; but permitted another action, although it assisted in a sin.
Therefore, the contemporary scholars have separated these actions into categories in order to facilitate the Muslims to determine the permissibility and the impermissibility of their actions, and clarify the reason for the difference in ruling amongst the scholars of the past.
 
Assisting in Forbidden Acts (اعانة على المعصية) 
 
Any assistance to haram in which the intention of sin is made will be regarded as haram impermissible. This consists of 3 types:
 
1.      The intention of sin is made in reality; e.g. one sells grape juice with the intention that wine is made from it.
2.      The mention of sin is made during the transaction; e.g. Zaid requests ‘Amr to sell grape juice to him so that he could make wine out of it and ‘Amr agrees to it and sells him the grape juice.
3.      The item sold or hired can only be used in sin and cannot be used for any other purpose; e.g. selling or hiring of musical instruments.
These actions constitute the actual meaning of اعانة على المعصية (assisting in forbidden acts) mentioned in Verse 5:2 of the Holy Quran. The parties involved in such transactions will be sinful for intending a sinful act, regardless of the fact that the actual sin was carried out or not.
 
To be a Means for a Sin being committed (تسبب الى المعصية) 
Any action that is a means for a sin being committed, but does not fall into any of the abovementioned types, will not be regarded as اعانة على المعصية (assisting in forbidden acts); but will be regarded as تسبب الى المعصية (being a means for the sin being committed). However, some scholars have used the term اعانة على المعصية for such actions too, as they are similar to each other. These are then categorized into 3 different types:
 
1.      سبب قريب محرك للمعصية – Those actions that are directly related to the sin and are a means for the sin coming into existence in such a way that if the action did not take place the sin would not have been committed. For example, using abusive language in regards to the idols that the disbelievers worship will result in the disbelievers reviling Allah Ta’ala. Thus, in Verse 6:108 of the Holy Quran, Muslims are prohibited from using abusive language in regards to the idols the disbelievers worship. Verses: 24:31, 33:32 and the Hadith mentioned above are other examples of such actions.
Such actions are prohibited in Islam and the one committing such an action will be sinful.
 
2.      سبب قريب غير محرك للمعصية بل موصل الى المعصية – Those actions that are directly related to the sin, but are not a means for the sin to come into existence. For example, one sells grape juice to a person who will make wine out of it, but the person selling the grape juice does not make intention of wine being made out of it.
The ruling regarding such actions will be that if the person had knowledge of the sin being committed, the action will be makrooh tahrimi (highly disliked); and if the person did not have knowledge of the sin being committed, the action will be makrooh tanzihi (disliked).
The difference of opinion between Imam Abu Hanifah and his pupils, Imam Muhammed and Imam Abu Yusuf, recorded in the books of Hanafi Fiqh, is in regards to the actions that fall under this type. Imam Abu Hanifah says that such actions are valid, whilst the others say that hey are not valid. However, a consensus could be created between the two views by saying that those who validated theses actions meant that it is permissible with undesirability and those who invalidated it were referring to the undesirability. 
 
3.      سبب بعيد – Those actions that are not directly related to the sin, but become a means for the sin to be committed at a later stage. For example, a person sells grapes to another person who will later make it into grape juice to make wine from it.
Such actions are permissible, but will be makrooh tanzihi (disliked) if the person knows that the sin will be committed.
 
Extracted from: Jawahirul Fiqh – Mufti Muhammed Shafi Uthmani – Vol.2 Pgs.439-462 – Maktabah Darul ‘Uloom Krachi
Salary received from occupations in banks, etc.
The salary received from those occupations that necessitate direct involvement in interest is not permissible.
Similarly, salaries and wages received from those actions that constitute the actual meaning of assistance in sin and those actions that are directly related to the sin and are a means for the sin coming into existence are also not permissible.
 
ولا تجوز الإجارة على شيء من الغناء والنوح والمزامير والطبل وشيء من اللهو وعلى هذا الحداء وقراءة الشعر وغيره ولا أجر في ذلك وهذا كله قول أبي حنيفة وأبي يوسف ومحمد رحمهم الله تعالى كذا في غاية البيان
(Fatawa Al-Hindiyyah Vol.4 Pg449 – Maktabah Rasheediyah)

Salaries received from those actions that are directly related to the sin but are not a means for the sin to come into existence and those actions that are not directly related to the sin are permissible, on condition that one does not make intention of the sin and majority of the money at the institution is not interest money. However, if more than 50% of the funds present at the institution is interest money or impermissible money, it will not be permissible to receive wages for any kind of service done for the company.
 
(Ahsan al-Fatawa Vol.7 Pg.329 – H.M.Sa’eed Company)
 
A few examples
After having understood the basic principals and guidelines, let us analyse a few frequently asked questions in regards to the abovementioned.
Q1. Recently I got an opportunity to work in Saudi Arabia as IT Manager in an Asset Management Company, which recently got shaped up. My main responsibility is to manage projects for asset management application from IT side and also look after/build IT infrastructure setup completely which includes Server setup, LAN/WAN setup, Email Servers, etc. This company has been formed by two major banks as an Asset Management Company. Will it be permissible for me to work as an IT manager in the abovementioned Company?
A1. There has been no clarification made as to whether the Company deals in interest bearing transactions or not. However, we understand that you will not be directly involved in the transactions of the Company, but will only assist in the IT department of the Company; hence, even if the Company is dealing in interest bearing transactions, your job at the Company will only be a means for the sin to be committed at a later stage and will not be directly related to the sin. Therefore, it will be permissible, although undesirable, for you to take up this job. The salary acquired from this employment will be permissible as long as majority of the funds present in the Company are not interest money. We would still advice you seek for another job which does not deal with interest in any way.


Q2. I currently work as a Software tester for a leading Wall Street foreign exchange trading firm. My basic function is to test the Back Office software. This software performs all calculations, account setups, and configurations, as well as facilitates the Trading in foreign exchange. My confusions stems from the fact that it is through this software that the interest that customers pay, earn, and the firm itself pays and earns is calculated. Also, in foreign exchange trading there is a high level of speculation. Our customers do have the option to trade on 0 interest and pay commission. This facility has been introduced by the firm for our Muslim clientele. However, when testing I have to make sure that the software works for all setups.

Am I then in any way part of the interest based transaction, and/or am I in any way as a tester - testing in the TEST environment only - facilitating the haram interest based transactions in any way?

Or am I external to the trades, since I am only part of testing to make sure that the Programmers correctly implement the requirements laid down by business.
I get a document that lists the requirements, and I test to make sure that they have been correctly implemented, and that the system works.
A2. We understand from the query that you are not directly involved in the interest bearing transactions; hence, do not directly fall within the ambit of the warning of the Hadith mentioned hereunder:
عن جابر قال لعن رسول الله صلى الله عليه وسلم آكل الربا وموكله وكاتبه وشاهديه وقال هم سواء. (رواه مسلم)
Hazrath Jabir (Radhiyallahu Anhu) narrates that Nabi (Sallahu ‘Alaihi Wasallam) cursed those who are involved in usury; whether it is the person who is giving usury, receiving it, writing the transaction or witnessing it.
(Sahih Muslim Vol.11 Pg.28 – Dar al-Ma’rifah)
However, even though your occupation as a Software tester is not directly related to the interest bearing transactions, you will still be a means for the sin to be committed at a later stage. Therefore, there will be a certain level of undesirability, but it will be permissible for you to take up this job. The salary received will be permissible to take as long as majority of the funds present in the firm are not interest money. We would still advice you to seek an employment in a place that does not deal with interest in any way.
 
Q3. What if someone is working for a stock exchange broker, securities company or holding company under conditions mentioned in Q2. Will it still be permissible?
A3. It will be permissible to be employed under such companies as long as the person is not personally involved in the interest-based transactions of the company; e.g. he may be an accountant or a software tester. The conditions and rulings mentioned in A2 will also apply here.
 
Q4. I am working with a company in Middle East which is under construction. Currently all the payments including our salaries are made through Banking loans (interest based). I am working in Finance Department and not 100% involved in managing the loan activities but a part of the team. Is this job haram or halal for me? Would the ruling be the same for employees working in other departments; i.e. engineering etc.?
A4. Your employment is in the financial department of the company which deals in interest. Although you are not 100% involved in the interest bearing loans, the fact that you are part of the team suggests that you are assisting in sin; hence, your employment will constitute the actual meaning of اعانة على المعصية (assisting in forbidden acts) mentioned in the following Verse of the Holy Quran:
 
ولا تعاونوا على الإثم والعدوان
And do not help each other in sin and aggression. (Verse: 5:2)
 
Therefore, it will not be permissible for you to take up such a job. The salary acquired from such an employment will not be permissible, and it will be compulsory for you to seek an alternate employment. However, if it is not possible to get a job very quickly and you have no other source of income to support yourself and your dependents, you will be excused for continuing with your present employment, on condition that you make all possible efforts to seek another job. You should also repent sincerely to Allah Ta’ala for being involved in an act of sin.
As for the other employees working in departments that do not necessitate involving in interest, their employment itself will be regarded as permissible. However, due to the fact that the salaries are been paid with interest bearing loans, their income would be contaminated.
In conclusion, a blanket ruling cannot be made in regards to all employments in institutions dealing with interest. The abovementioned principles and guidelines could be used in determining a ruing regarding these employments. One should also consult the Ulama of the area regarding such employments.
 
And Allah Ta’ala Knows Best
Abu Yahya
Student – Darul Ifta
 
 
Introduction
It is important for Muslim professionals dealing with non-Muslim employers and clients to be cognizant of the following principle in Islam:
 
وَتَعَاوَنُوا عَلَى الْبِرِّ وَالتَّقْوَى وَلَا تَعَاوَنُوا عَلَى الْإِثْمِ وَالْعُدْوَانِ (المائدة: 2)
And assist one another in righteousness and piety, but do not assist one another in sin and transgression (al-Māidah: 2)
Due to the widespread interest, gambling, and other impermissible factors found in businesses, a Muslim must exercise caution to ensure that he is not involved in these harām acts nor is he assisting others in it.  However, this can only be done when a Muslim understands what exactly constitutes as assisting in sin.  The former Grand Muftī of Pakistan, Muftī Muhammad Shafī' رحمه الله, laid out these principles, along with examples, in an article entitled تفصيل الكلام في مسألة الإعانة على الحرام.  Hereunder, we present the principles behind assisting in sin based on Muftī Shafī's research.
 
Types of Assistance in Sin
There are two categories of assistance in sin:
1.      Assist in the actual sin itself – الإعانة على المعصية
2.      Be a means to bring about the sin – السبب إلى المعصية
We will look at each of the two ways and their rulings separately.
 
Assisting in the Actual Sin
This is of three categories:
1.      The person intends to assist in the sin. 
a.       For example, selling grape juice with the intention that the buyer will make wine from it
2.      The sin is clearly mentioned in the transaction
a.       For example, selling grape juice to someone who mentions his intention of making wine from it
3.      The person sells something which has no other purpose except sin
a.       For example, selling musical instruments
 
ما قامت المعصية بعينه هو ما كانت المعصية في نفس فعل المعين بحيث لا تنقطع عنه نسبتها بفعل ذلك الفاعل المختار وذلك بثلاث وجوه: الأول أن يقصد الإعانة على المعصية. فإن من باع العصير بقصد أن يتخذ منه الخمر أو أمرد بقصد أن يفسق به كان عاصيا في نفس هذا البيع بهذه النية والقصد كذا من آجر بيتا بقصد أن يباع فيه الخمر فقامت المعصية بعين هذه الإجارة مع قطع النظرعن فعل فاعل مختار لاقتران هذه النية كما مر مصرحا في الأشباه وحظر رد المحتار والثاني بتصريح المعصية في صلب العقد كمن قال بِعْني هذا العصير لأتخذه خمرا فقال بِعْتُه...فإنه بهذا التصريح تضمن نفس العقد معصية مع قطع النظر عما يحدث بعد ذلك من إتخاذه خمرا...والثالث بيع أشياء ليس لها مصرف إلا في المعصية...ففي جميع هذه الصور قامت المعصية بعين هذا العقد والعاقدان كلاهما آثمان بنفس العقد سواء استعمل بعد ذلك في المعصية أم لا سواء استعملها على هذه الحالة أو بعد إحداث صنعة فيه فإن استعملها في المعصية كان ذلك اثما آخر على الفاعل خاصة (ص447-448)

All three categories of such assistance in sin are harām.  At the time of the transaction, there is no doubt that sin will be committed as the person either intends the sin himself or he knows of the other person's sin due to his mentioning it or due to the fact that the transaction has no real halāl purpose. 
Being a Means for the Sin
Even though a person may not assist in the sin itself, he may still be a means for the sin to take place.  This is referred to as السبب إلى المعصية, and it also has three categories.

1. For example, insulting the deities of another person and, thus, causing him to insult Allāh.  Had this person not insulted the other person's deity, he would not have insulted Allāh.  The same applies to insulting someone else's parents.

1. For example, bringing alcohol to someone who wants to drink it or bringing a sword to someone who wants to kill unjustly.  Even though this act itself did not bring about the sin, however, it directly helped the sinner to commit the sin

1. For example, selling grapes to someone who will use it to make wine or selling wood to someone who will use it to build a church 

 
سبب محرك للمعصية بحيث لو لاه لما أقدم الفاعل على هذه المعصية كسب آلهة الكفار بحيث يكون سببا مفضيا لسب الله سبحانه وتعالى ومثله نهي أمهات المؤمنين عن الخدوع في الكلام للأجانب ونهي النساء عن ضرب أرجلهن لكون ذلك الخدوع وضرب الأرجل سببا جالبا للمعصية وإن خلا عن نية المعصية كما هو ظاهر عن شأن أمهات المؤمنين ونساء المؤمنين.
وسبب ليس كذلك ولكنه يعين لمريد المعصية ويوصله إلى ما يهواه كإحضار الخمر لمن يريد شربه وإعطاء السيف بيد من يريد قتلا بغير حق ومثلها سائر الجزئيات المذكورة سابقا فإنها ليست أسبابا محركة وباعثة على المعصية بل أسباب تعين لباغي الشر على شره...فالقسم الأول من السبب القريب حرام بنص القرآن قال تعالى ولا تسبوا الذين يدعون من دون الله فيسبوا الله عدوا بغير علم (الأنعام)...القسم الثاني من السبب القريب أعنى ما لم يكن محركا وباعثا بل موصلا محضا فحرمته وإن لم تكن منصوصة ولكنه داخل فيه باشتراك العلة وهي الإفضاء إلى الشر والمعصية ولهذا أطلق الفقهاء رحمهم الله عليها لفظ كراهة التحريم لا الحرمة كما في سائر الجزئيات المذكورة سابقا فإنهم قالوا إنها تكره كراهة التحريم كما صرح به في الخانية جزما واختاره كثير من أرباب الفتوى ومن أطلق عليه لفظ الجواز فيحمل على جواز العقد بمعنى الصحة دون رفع الاثم كما هو معهود عند فقهائنا في مواضع لا تحصى...
وأما السبب البعيد كبيع الحديد من أهل الفتنة وبيع العنب ممن يبتخذه خمرا وبيع الآجر والحطب ممن يتخذها كنيسة أو بيعة وكذا إجارة الدابة لمن يريد سفر معصية وأمثالها إذا علم فتكره تنزيها (ص 449-452)

Assisting in the sin itself is harām, whereas being a means for the sin is makrūh tahrīmī.  In terms of practice, both of these types are completely impermissible, regardless of whether the person had a sinful intention or not. 
As for being an indirect means of sin, if the person knew that the sin would be committed, then it is undesirable.  However, if the person did not know that the sin would be committed at the time of the transaction, but rather only learned of it later, then one will be excused.
 
Conclusion
 
After understanding the above mentioned categories of assistance in sin, each person must now analyze their dealings and see if their actions fall in any of these categories.  In regards to your question on developing and maintaining banking software, the answer depends on the functionality of the software. 
If the software is developed to calculate and charge interest such that it has no other purpose, then it would constitute assisting in the actual sin itself and would, therefore, be impermissible.  However, if the software has several functions, one of which is the calculation of interest which the bank uses to pay or charge the customer, then it would be a direct means for the sin to come about and, thus, impermissible.  Finally, if the software is not meant to calculate interest, but rather the bank uses the functions of the software to calculate interest, then this would be permissible, but disliked if the person knows that the bank will use it for this purpose, since this is an indirect and distant means for the sin to occur. 
 
And Allāh Knows Best
Abrar Mirza
Student, Darul Iftā'

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